Article
Nanoscience & Nanotechnology
Yishui Liu, Mengxi Pei, Huanhuan Liang, Xiaodong Wu, Bo Li, Zhichun Si, Feiyu Kang
Summary: Volatile organic compounds (VOCs) are receiving increased attention due to their impact on air pollution and human health. Researchers have developed a photocatalytic system using few-layer CoAl-LDH as a support for Pt nanoparticles, which are coated on CeO2 nanoparticles. This system forms type II heterojunctions and improves the efficiency of VOC removal. The study provides a useful method for the preparation of high-efficiency photothermal catalysts.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Applied
Wei Liu, Shengnan Wang, Ruoyang Cui, Zhongxian Song, Xuejun Zhang
Summary: Catalytic oxidation technology is effective for VOC removal, and development of high activity and stable catalyst is crucial. CuMnOx-HS catalyst prepared by special oxidation method shows superior catalytic performance and water resistance, with great potential for practical applications.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Physical
Yuxin Wang, Fukun Bi, Yunyun Wang, Minghan Jia, Xuefen Tao, Yinxiu Jin, Xiaodong Zhang
Summary: This study focused on the catalytic performance of MOF-derived CeO2 supported Ag catalysts prepared by different synthesis methods for toluene oxidation, identifying the method resulting in the best catalytic performance and analyzing the influencing factors through the study of physicochemical properties.
MOLECULAR CATALYSIS
(2021)
Article
Chemistry, Physical
Ruosi Peng, Haozhi Zhang, Yanjie Guo, Weiqing Huang, You Zhang, Junliang Wu, Mingli Fu, Chenglong Yu, Daiqi Ye
Summary: This study investigates the effect of lanthanide doping on the physicochemical properties and catalytic activity of Pt/CeO2 catalysts for toluene oxidation. The results demonstrate a significant impact of lanthanide doping on the catalyst activity, which is closely related to the ion radius and valence state of the dopants. Doping with Gd enhances the catalytic oxidation of toluene over Pt/CeO2 catalyst, possibly by promoting the formation of Gd-Ce complexes and oxygen vacancies.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
N. N. Mikheeva, V. Zaikovskii, Y. Larichev, G. Mamontov
Summary: Toluene, a typical volatile organic compound, is a hazardous material and the development of catalysts for its oxidation is crucial. The Ag-CeO2/SBA-15 catalysts show the highest catalytic activity in toluene oxidation, attributed to the synergistic effect between ceria and silver.
MATERIALS TODAY CHEMISTRY
(2021)
Article
Chemistry, Physical
Zhiqiang Wang, Lixin Zhang, Jiawei Ji, Yuchao Wu, Yandi Cai, Xiaojiang Yao, Xianrui Gu, Yan Xiong, Haiqin Wan, Lin Dong, Yu-Wen Chen
Summary: The study presents a novel catalyst Ir/Ce/gamma-Al2O3 for complete oxidation of toluene, featuring small CeO2 and Ir-0 nanoparticles that exhibit higher catalytic activity. Results from XRD, TEM, Raman, and XPS indicate a strong interaction between IrO2 and small CeO2 nanoparticles, leading to enhanced catalytic performance. This development in synthesizing iridium-based catalysts shows promise for the catalytic oxidation of VOCs.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Inorganic & Nuclear
Guanlun Guo, Jing Yu, Mingrui Wei
Summary: In this study, an Ag-CeO2-LSCF composite catalyst was prepared by impregnation method. The change in catalytic soot performance of the LSCF catalyst before and after composite was investigated. The results showed that the A-C-L composite catalyst exhibited a good microstructure and had lower characteristic temperatures compared to pure LSCF. The catalytic performance of the A-C-L composite catalyst was found to be the best when the Ag content was 8 wt%.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Wei Liu, Huiqiong Yu, Dingyao Zhao, Shuang Yang, Shuchen Liu, Yang Feng, Haiyang Li, Dujuan Mo, Zhongxian Song, Xi Chen, Xuejun Zhang
Summary: A surface reaction strategy was proposed to prepare high-performance Ag/Co3O4 catalyst by controlling the AgCo interaction, achieving efficient degradation of aromatic VOCs. The strategy enhanced the interaction between Ag and Co3O4, improving the catalytic performance.
APPLIED CATALYSIS A-GENERAL
(2023)
Article
Chemistry, Physical
Guimin Jiang, Yiping Su, Huixia Li, Yafeng Chen, Shun Li, Yibin Bu, Zuotai Zhang
Summary: This study demonstrated the importance of understanding the interfacial effects between noble metals and supports in designing efficient and low-cost catalysts for HCHO removal. By utilizing CeO2 supports with different crystal planes and combining them with Ag, the researchers achieved high reactivity for HCHO oxidation, providing insights for the design of additional highly efficient and low-cost catalysts.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Travis G. Novak, Paul A. DeSario, Michelle D. Johannes, Todd H. Brintlinger, Ryan H. DeBlock, Jeffrey W. Long, Christopher N. Chervin, Rhonda M. Stroud, Debra R. Rolison
Summary: CeO2 aerogel-supported Ni(OH)(2) nanoparticles demonstrate superior activity and stability in CO oxidation reaction. The intimate contact between Ni(OH)2 NPs and the bonded nanoparticulate CeO2 network prevents the conversion to NiO. CO has lower adsorption energy on Ni(OH)(2) compared to NiO, resulting in reduced poisoning of active surface sites.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
Shilpa Sonar, Jean-Marc Giraudon, Jean-Francois Lamonier, Rino Morent, Nathalie De Geyter, Axel Lofberg
Summary: Hopcalite supported Ag-containing materials with different Ag concentrations were prepared and used for the adsorption-thermal catalytic oxidation of toluene. Among them, Hop-0.5 Ag exhibited the best catalytic performance and stability.
Article
Chemistry, Physical
Yue Zhang, Cong Wu, Zhiqiang Wang, Jiawei Ji, Haiqin Wan, Weixin Zou, Qing Tong, Jingfang Sun, Lin Dong, Yu-Wen Chen
Summary: Bimetallic Pt-Ir alloy nanoparticles were successfully prepared by a microwave-assisted method and used as catalysts for toluene combustion. The Pt2.5Ir/CeO2 catalyst showed excellent low-temperature catalytic activity, attributed to the interaction between Pt and Ir, richer adsorbed oxygen species, and low-temperature reducibility.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Applied
Shengsheng Chang, Yong Jia, Yiqing Zeng, Fuping Qian, Lina Guo, Shenghua Wu, Jinli Lu, Yunlong Han
Summary: The effect of CeO2 plane exposure on total toluene oxidation was investigated by preparing CeO2 nanorods, nano-octahedrons, and nano-cubes with different plane exposures. The results revealed that the (110) plane of CeO2 was the most beneficial for the dispersion of Pt species, followed by the (111) face. The improved Pt species dispersion enhanced the metal-supports interaction, facilitating the electron transfer and O2 adsorption-activation, thus promoting the total oxidation of toluene.
JOURNAL OF RARE EARTHS
(2022)
Article
Chemistry, Multidisciplinary
Srisin Eaimsumang, Nuwong Chollacoop, Apanee Luengnaruemitchai, Stuart H. Taylor
Summary: This study demonstrates a simple hydrothermal synthesis approach for preparing CeO2-supported gold (Au) catalysts, which exhibit enhanced catalytic performance in oxidation reactions when the reducibility of CeO2 support increases and the number of adsorbed peroxide species on the support increases due to Au addition.
FRONTIERS IN CHEMISTRY
(2022)
Article
Energy & Fuels
Richuan Rao, Hanwen Liang, Chunming Hu, Huaze Dong, Xiongzi Dong, Yongqiang Tang, Song Fang, Qiang Ling
Summary: Ag-CeO2 catalysts were synthesized using different methods to study their catalytic performance in CO combustion. The surface chemical state of Ag and CeO2 nanoparticles significantly influenced the interaction at the Ag-CeO2 interface. Urea-assisted pyrolysis resulted in an interface with more metallic Ag species, improving the reductivity of CeO2 and enhancing the catalyst performance. Activated carbon-assisted pyrolysis led to an interface with more positively charged Ag+ ions, requiring higher CO conversion temperature. The addition of sodium salts promoted the transformation of the Ag-CeO2 interface, resulting in more Ce3+ cations and enhanced catalyst performance.
Article
Chemistry, Physical
Yanyan Yang, Zhongliang Yu, Xiaowei An, Xiaohui Duan, Meng Chen, Juan Zhang, Xiaogang Hao, Abuliti Abudula, Guoqing Guan
Summary: Developing an efficient and stable electrocatalyst for hydrogen evolution reaction (HER) is crucial for renewable hydrogen production. In this study, Ru nanoparticles (NPs) were fabricated on Ti3C2Tx nanosheets (Ti3C2Tx-NS) using a facile electrochemical reduction method. The Ru@Ti3C2Tx-NS electrocatalyst showed Pt-like electrocatalytic properties for HER, with an ultra-low overpotential, small Tafel slope, and long-term stability in both acidic and basic solutions. Theoretical calculations also demonstrated the lower Gibbs free energy of Ru@Ti3C2Tx-NS for HER compared to pure Ru or Ti3C2Tx-NS. This approach holds promise for designing noble metal NPs anchored MXene nanosheets for HER applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Electrochemistry
Hideya Tsuchikado, Meng Chen, Guoqing Guan, Toshiyuki Abe
Summary: A multi-deposited CdS photoelectrode was prepared by chemical bath deposition process, and it showed significantly higher steady-state photocurrents compared to the single-deposited CdS. This improvement was attributed to the formation of a porous structure, which increased the surface area of CdS and resulted in a thicker deposition on the electrode substrate, causing a redshift of absorption edge and enhancing the photoanodic output.
JOURNAL OF APPLIED ELECTROCHEMISTRY
(2023)
Article
Chemistry, Physical
Jinggang Zhao, Peifen Wang, Changlin Liu, Qiang Zhao, Junli Wang, Lei Shi, Guangwen Xu, Abuliti Abudula, Guoqing Guan
Summary: A nanosheet-state CoMnx mixed oxide with multifarious active regions was synthesized and applied for catalytic combustion of toluene at low temperatures. The optimized catalyst showed excellent performance and long-term stability, with increased specific surface area and abundant active species.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Changlin Liu, Yang He, Xiaowei An, Nutthaphak Kitiphatpiboon, Xiao Du, Xiaogang Hao, Abuliti Abudula, Guoqing Guan
Summary: In this study, a poly(ether block amide) (PEBA) based polymer electrolyte with lithium bis-(trifluoromethanesulfonyl)imide (LiTFSI) as the Li salt is developed, which possesses good ion conductivity and suppresses the growth of Li dendrites. The electrolyte provides abundant amide groups to activate TFSI- anions and further enriches lithium fluoride (LiF) content in the SEI layer, resulting in improved cyclability and long-life span of the full-cell battery. Therefore, the PEBA based electrolyte shows great potential for solid-state lithium metal batteries.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Nutthaphak Kitiphatpiboon, Meng Chen, Changrui Feng, Yifan Zhou, Changlin Liu, Zhongbao Feng, Qiang Zhao, Abuliti Abudula, Guoqing Guan
Summary: Currently, electrolysis of seawater-based electrolytes for hydrogen production is gaining attention. A composite electrocatalyst, MnCo2O4@NiFe-LDH, was developed for seawater electrolysis, which exhibited low overpotentials and improved stability. The NiFe-LDH layer acted as a protective layer and improved the active surface area of MnCo2O4 nanowires. Additionally, high valence states of Mn3+, Co3+, Ni3+, and Fe3+ played a vital role in the oxygen evolution reaction. This composite electrocatalyst shows promise for long-term seawater splitting.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Engineering, Environmental
Jie Wang, Liang Zhang, Yasi Hu, Xiao Du, Xiaogang Hao, Qing Cao, Guoqing Guan, Zhong Liu, Jun Li, Shanxia Luo, Xiaowei An
Summary: By creating a special highly-exposed crystal facet, the surface atomic arrangement and coordination of BiOBr can be significantly altered to improve its performance. In this study, the effect of different exposed crystal facets on the electrochemically switched ion exchange (ESIX) activity of BiOBr was investigated. The results showed that the BOB-010 nanosheets had better ESIX performance for Br- recovery compared to BOB-001, primarily due to its better photo-response characteristics and the ease of ion exchange through open channels between [Bi2O2] layers.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Jinggang Zhao, Peifen Wang, Jing Wang, Changlin Liu, Junli Wang, Lei Shi, Guangwen Xu, Abuliti Abudula, Guoqing Guan
Summary: A nanoparticles-stacking MnCox oxide with multifarious active phases was successfully synthesized using a starch-paste assisted method, achieving complete combustion of 1,000 ppm toluene at 226 degrees C. The method not only constructed a porous structure but also enriched active species through the interaction of Mn and Co species with starch-paste. The study demonstrated the potential of creating novel catalysts with multiple active regions.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Jiajia Xu, Guohua Du, Yufei Zhai, Guoqing Guan, Yuanyang Wang
Summary: The preparation and characterization of three deep eutectic solvents (DESs) using N, N, N-trimethyl butylsulphonate ammonium hydrosulfate (DES1-0) as HBA and urea as HBD are presented. The DESs are used as electrolytes for fuel cells, and show high performance, with DES2-1 exhibiting the highest performance.
Article
Chemistry, Physical
Meng Chen, Nutthaphak Kitiphatpiboon, Changrui Feng, Qiang Zhao, Abuliti Abudula, Yufei Ma, Kai Yan, Guoqing Guan
Summary: In this study, a boron (B) doped MnFe2O4 spinel-type electrocatalyst with heterostructure was synthesized for seawater electrolysis. It was found that the introduction of B species effectively optimized the electronic configuration of MnFe2O4 and improved the electron transfer ability, reducing the energy barrier and enhancing the reaction process. The catalyst showed low overpotential and high stability in real seawater environment, making it a promising candidate for seawater splitting.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Energy & Fuels
Sanggono Adisasmito, Yohanes Andre Situmorang, Fauzan Firdaus, Dwiwahju Sasongko, Yusrin Ramli, Guoqing Guan, Antonius Indarto
Summary: This study simulated and compared the torrefaction characteristics of woody and non-woody biomasses. It found that the hemicellulose decomposition rate was highest at 290°C, while the biomass mass yield decreased by 60% to 70% at a torrefaction temperature of 300°C. The evaluation concluded that an energy yield of >90% could be obtained by applying the torrefaction method at 250°C for 30 minutes.
BIOENERGY RESEARCH
(2023)
Article
Agricultural Engineering
Le Kim Hoang Pham, Suwadee Kongparakul, Mingyue Ding, Guoqing Guan, Narong Chanlek, Prasert Reubroycharoen, Dai-Viet N. Vo, Nguyen Van Cuong, Chanatip Samart
Summary: Catalytic pyrolysis is a cost-effective technology for producing high-quality biofuels. The development of catalysts plays a crucial role in controlling the reaction pathways and producing specific products. In this study, palm kernel shells were pyrolyzed with a melamine-doped activated-carbon-supported Ni2P catalyst. The catalyst showed great potential for the selective production of phenolic compounds.
BIOMASS & BIOENERGY
(2023)
Article
Chemistry, Physical
Changrui Feng, Meng Chen, Yifan Zhou, Zhengkun Xie, Xiumin Li, Pairuzha Xiaokaiti, Yasuki Kansha, Abuliti Abudula, Guoqing Guan
Summary: High-entropy (NiFeCoV)S2 porous nanosheets were fabricated on Ni foam through a hydrothermal reaction process for alkaline water/seawater electrolysis. The rough and porous nanosheets provided large active surface area and exposed more active sites, facilitating mass transfer and improving catalytic performance. The as-fabricated catalyst exhibited low overpotentials and excellent corrosion resistance, showing promise for efficient water/seawater electrolysis.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Engineering, Chemical
Zheng Zhang, Jinfeng Zhang, Zhihua Zhang, Xiao Du, Xiaogang Hao, Xiaowei An, Guoqing Guan, Jun Li, Zhong Liu
Summary: A novel composite binder based on physically blended PVDF and PAA was successfully fabricated to enhance LiMn2O4/C film coated electrodes. The resulting LiMn2O4/C/PVDF-b-PAA film exhibited better mechanical, hydrophilic, and electrochemical properties compared to the LiMn2O4/C/PVDF film. The ion exchange interaction between -COOH groups in PAA and Li+ facilitated the transport of Li+ at the electrode interface, leading to enhanced lithium extraction performance.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Nan Zhang, Xueer Pan, Jingxuan Yang, Qian Liu, Wenhao Lian, Xiao Du, Zhonglin Zhang, Xiaogang Hao, Guoqing Guan
Summary: Fast heat transfer in the cyclone pyrolyzer enhances the production of pyrolysis gas and tar, improving the quality of tar produced. Compared to the downer pyrolyzer, the cyclone pyrolyzer achieves high solids holdup, violent turbulence, and faster heat transfer. The study reveals that gas-solids heat convection is the main contributor to the heat transfer process, while heat radiation and conduction are relatively small and negligible. The heating rate in the cyclone pyrolyzer is significantly increased compared to the downer pyrolyzer under the same operating conditions.
Article
Chemistry, Analytical
Zeying Yang, Boyong Cao, Xiaowei An, Zhongliang Yu, Wuduo Zhao, Fangcheng Su, Guoqing Guan, Yanhao Zhang, Zhengkun Xie, Baoxian Ye
Summary: A reliable electrochemical sensor based on a N-C mediated gamma-Mo2N nanocomposite modified carbon paste electrode was developed for selective and sensitive determination of 6-PPD. The sensor showed good stability and superior sensitivity, and has the potential to be applied for real-time evaluation and monitoring of environmental pollutants.
Article
Chemistry, Physical
Haojie Li, Bingke Yang, Zhen Yao, Xuetao Wang, Kaiming Shen, Mengjie Liu
Summary: This study systematically investigates the influence of metal and nonmetal element doping on the photochemical properties of g-C3N4 for efficient catalytic AB hydrogen production. It provides a design method for high performance bifunctional catalysts of photocatalysis and metal catalysis. The results show that both non-metals (B, P) and metals (Ru, Ni) have efficient regulatory effects on the band structure of g-C3N4, resulting in a reduced band gap and improved hydrogen production. The study offers a theoretical method for the coupling of metal catalysis/photocatalysis ammonia borane to produce hydrogen.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Shrouq Mujahed, Davide Gandolfo, Luigi Vaccaro, Evgueni Kirillov, Dmitri Gelman
Summary: In this study, a high-valent Ru(IV) bifunctional catalyst was successfully applied for the hydrosilylation of various functional groups. The high-valent hydride complexes showed high chemoselectivity and affinity towards reducing polar bonds. The scope, limitations, and plausible mechanism of the reaction were described.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Yongzhen Peng, Kongchen Xia, Qi Wu
Summary: In this study, we report an engineered cyclohexanone monooxygenase that can be used for the asymmetric synthesis of chiral alpha-deuterated carbonyl compounds via enantioselective reductive dehalogenation. The engineered enzyme exhibits good chemoselectivity, stereoselectivity, and d-incorporation, making it a promising method for the synthesis of deuterated drugs.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Qi Yang, Ruixuan Xu, Hongqi Nie, Qilong Yan, Jun Liu, Jiuyu Chen, Yunlan Sun
Summary: The adsorption and decomposition processes of ammonium perchlorate (AP) on pure-Al and Al2O3/Al surfaces were investigated using density functional theory. The results showed that the pure-Al surface is more conducive to the decomposition of AP and the activation of NH3, while the Al2O3/Al surface promotes the disengagement of H and NH3 decomposition.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Yudong Hu, Guochao Xu, Ye Ni
Summary: This study identified a novel phenylalanine dehydrogenase (QtPDH) with high catalytic efficiency and thermal stability, making it a promising biocatalyst for industrial production of bulky aromatic primary amines. QtPDH exhibited a broader substrate specificity and significantly longer half-life compared to BbPDH.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Weiling Zhao, Zhiling Huang, Hui Shen, Xianglong Li, Shaofen Zhao, Bo Xie, Shengjie Xia
Summary: This study investigated the effects of metal doping and crystal plane selection on the CO2 adsorption properties of MgO using density functional theory (DFT) methods. The results showed that the appropriate crystal plane and metal doping can improve the adsorption properties of MgO on CO2. The influence of different crystal planes and metal dopants on CO2 adsorption properties varied significantly. The research provides some references for experimental studies on CO2 adsorption by MgO by combining the dual modification of crystal plane and doped metal.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Jie Zhang, Jinwei Chen, Zongbo Shi, Junyu Zhao, Runsheng Zhuo, Ruilin Wang
Summary: In this study, a double-layered silicalite-1 support with high specific surface area was synthesized, and a magnesium modification strategy was adopted to improve the catalytic activity and stability of the zinc-based catalyst. The modified catalyst showed enhanced propylene selectivity and anti-coking property.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Pei-Sen Gao, Chang-Wang Pan, Cheng Liu, Wen -Tong Chen
Summary: Asymmetric electrocatalysis offers a unique approach to obtain enantioenriched molecules that are difficult to obtain through conventional methods. This study developed a novel bifunctional electrocatalyst, enabling the oxidative kinetic resolution of chiral 1,4-diols and gamma-lactones. The work demonstrates the potential of bifunctional electrocatalysis for asymmetric synthetic methods and its importance in the development of novel electrocatalytic methods.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Qinzhe Lin, Xuanjin Lv, Xianming Zeng, Mengning Zhong, Qiyun Wu, Huilin Ren, Shenpeng Xu, Wentian Chen, Wenting Du, Jun Li
Summary: The catalytic efficiency of engineered IRED M5 was found to be relatively low when tasked with a bulky amine substrate. Rational design led to the mutants M203V and F260A, with F260A exhibiting a substantial improvement in conversion and stereoselectivity. The study revealed the potential molecular mechanisms underlying the effect of F260A and M203V on catalytic performance.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Zhishuai Wang, Fengyun Su, Hailong Cao, Mengzhen Tian, Xiang Li, Haiquan Xie, Xiaoli Jin, Zhengdao Li, Xin Ying Kong
Summary: In this study, the efficiency of photocatalytic CO2 reduction was significantly enhanced by incorporating nickel oxide onto niobium pentoxide. The resulting catalyst showed remarkable methane and carbon monoxide production improvements.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
A. Yu. Sidorenko, Yu. M. Kurban, T. V. Khalimonyuk, I. V. Il'ina, N. S. Li-Zhulanov, O. S. Patrusheva, V. V. Goltsova, M. P. Bei, Zh. V. Ihnatovich, J. Warna, K. P. Volcho, N. F. Salakhutdinov, D. Yu. Murzin, V. E. Agabekov
Summary: This study provides a comprehensive investigation into the catalytic condensation of renewable 3-carene with formaldehyde for the one-step preparation of terpenoid trans-4-hydroxymethyl-2-carene. Various acids and alumino-silicates were found to catalyze the reaction, but the selectivity to the desired product was limited. Phosphoric acid showed the highest selectivity, and an excess of formaldehyde or catalyst loading significantly increased the yield of the target product. Water presence also led to increased selectivity. Additionally, a detailed mechanism for the 3-carene condensation with formaldehyde was proposed and confirmed through kinetic modeling.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Meng-Yu Rong, Jing Nie, Shen Li, Jun-An Ma
Summary: We synthesized a new class of chiral quaternary ammonium salts and used them as catalysts in phase-transfer catalytic asymmetric alkylation. By employing these catalysts, we obtained a series of chiral fluorinated aromatic alpha-amino acid derivatives with high yields and enantioselectivities.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Zhaozhou Wei, Guangtao Wei, Huixian Che, Deyuan Xiong, Linye Zhang, Ruihua Xue, Yalin Tang, Xuanli Lu
Summary: This study demonstrates that small-sized graphite crystallite and highly defective carbon-based catalysts can increase the -SO3H density of the catalysts and modulate their surface electronic properties, leading to improved efficiency in the alpha-pinene hydration reaction. The reduction of graphite crystallite size is considered a critical step in enhancing the selectivity of alpha-terpineol.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Kempanna S. Kanakikodi, Nagendra Kulal, K. S. Subramanya, M. S. Puneethkumar, Bhavana B. Kulkarni, Ganapati Shanbhag, Sanjeev P. Maradur
Summary: An effective and highly selective protocol for synthesizing asymmetric organic carbonates using dimethyl carbonate (DMC) as a reactant and solvent has been developed. The performance of CeO2 nanostructures with different morphologies in the carbonate interchange reaction (CIR) of alcohols was investigated, and the CeO2 nano-catalyst with rod morphology exhibited the highest oxygen vacancy and remarkable enhancement in conversion. The CeO2 characterization data revealed that the exposed active sites, defect density, coordination state of surface atoms, and reducibility of the catalytic materials are the contributing factors to its high catalytic activity. CeO2 can be easily recovered and reused for multiple cycles.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Yanzhao Gao, Xianglei Meng, Shiqi Huang, Hui Wu, Liantao Jiang, Yu Zhou, Yuting Song, Yanyan Diao
Summary: Gamma alumina modified with alkaline earth metal shows improved catalytic performance for hydrogenation reactions. Pd catalysts supported by Al2O3 and Mg-modified Al2O3 were synthesized and their structure, composition, and surface acidity were investigated. The results showed that Pd/MgO-Al2O3-2 catalyst exhibited the best catalytic performance due to its metallic state palladium and weak acid sites.
MOLECULAR CATALYSIS
(2024)
