Article
Chemistry, Physical
Zhiming Pan, Meng Zhao, Hangyu Zhuzhang, Guigang Zhang, Masakazu Anpo, Xinchen Wang
Summary: Ionothermal synthesis in a ternary salt melt can promote polycondensation and improve crystallinity, resulting in the formation of Zn-PHI/PHI hybrid polymer with built-in electric field for efficient charge carrier separation and transfer in photocatalytic water oxidation.
Article
Chemistry, Physical
Jing Luo, Ming Yan, Haiyan Ji, Liping Mu, Yan Huang, Linhua Zhu, Yiru Zou, Chao Wang, Peiwen Wu, Yanhong Chao, Wenshuai Zhu
Summary: This study successfully synthesized Ce@C-BN materials through a direct pyrolysis strategy, which exhibited high specific surface area and excellent adsorption performance for desulfurization. The presence of Ce-MOFs not only provided active sites but also enhanced the interaction between Ce and BN.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Chemical
Yuan Zhang, Hongshun Ran, Xinyu Liu, Xinmiao Zhang, Jie Yin, Jinrui Zhang, Jing He, Hongping Li, Huaming Li
Summary: A series of BCN nanofibers doped with Cu(I) adsorption sites (BCN-Cu-X, X = 0.02, 0.04, 0.06, 0.08 mmol) were successfully fabricated via a simple one-pot pyrolysis method. BCN-Cu-0.04 exhibited significantly higher adsorption capacity for DBT compared to BCN, and also showed high ADS performance for the refractory sulfur compound 4,6-DMDBT. DFT calculations revealed that the enhanced performance of BCN-Cu-X in ADS is attributed to the p-p interaction and newly formed S-Cu coordination bond.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Physical
Jiu Wang, Heng Zhao, Bicheng Zhu, Stephen Larter, Shaowen Cao, Jiaguo Yu, Md Golam Kibria, Jinguang Hu
Summary: The research demonstrates an effective strategy for fast sunlight-driven glucose isomerization with over 60% fructose selectivity, achieved through a rationally designed crystalline carbon nitride. This provides a new photocatalytic process for biofuels and chemicals production.
Article
Chemistry, Physical
Linjie Lu, Jing He, Peiwen Wu, Yang Sun, Mingqing Hua, Peng Cui, Wenshuai Zhu, Huaming Li, Zhichang Liu, Chunming Xu
Summary: This study proposes a core-shell structured Au nanocatalyst with boron nitride (BN) shells to enhance its thermodynamic stability. The proper thickness of the BN shell is found to balance the sintering resistance and catalytic activity, resulting in significantly improved conversion performance in oxidative desulfurization reactions.
Article
Engineering, Environmental
Meng Jiang, Yuxiang Zhu, Xiang Zhong, Qiufan Sun, Shengshen Gu, Jianfeng Yao
Summary: A three-dimensional boron-doped carbon nitride catalyst with high electrocatalytic nitrogen reduction reaction activity is reported in this study for ammonia production. The optimized doping content and unique 3D structure of the catalyst enhance the contact between electrolyte and active sites, improve nitrogen adsorption and activation, and lower the barrier for nitrogen reduction reaction. This research opens up a new avenue for the rational design of nonmetal-based catalysts for nitrogen reduction.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Diogo A. F. Goncalves, Mauricio V. B. Pinheiro, Klaus Krambrock, Rodrigo R. Resende, Breno R. L. Galvao, Eudes Lorencon
Summary: In this study, Mo-doped graphitic carbon nitride was successfully prepared and exhibited exceptional catalytic activity in the oxidative desulfurization reaction. The catalytic properties of Mo/g-C3N4 were influenced by catalyst dosage, O/S ratio, and temperature. Kinetic studies showed a pseudo-first-order reaction with a low apparent activation energy for DBT oxidation. Additionally, the Mo/g-C3N4 catalyst exhibited poor stability as catalytically active Mo species were leached from the catalyst structure, leading to catalyst deactivation.
Article
Chemistry, Physical
Naixia Lv, Jie Yin, Wendi Fu, Jinrui Zhang, Yujun Li, Ding Jiang, Hongping Li, Wenshuai Zhu
Summary: This study improves the catalytic activity of hexagonal boron nitride catalysts for aerobic reactions by doping impurity atoms, especially showing higher activation on defects containing oxygen-nitrogen and nitrogen-boron. The subsequent application in oxidative desulfurization reactions indicates that O-N and C doped systems are good choices.
Article
Engineering, Environmental
Biswa Nath Bhadra, Md. Mahmudul Hassan Mondol, Sung Hwa Jhung
Summary: The quantitative contribution of microwave in oxidative desulfurization (ODS) of liquid fuel was evaluated and found to enhance the reaction rate and lower the activation energy. The catalyst W2N@C exhibited the highest ODS performance under microwave irradiation, with a 3.4 times higher oxidation rate of thiophene compared to conventional electric heating.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Lin-Jie Lu, Pei-Wen Wu, Jing He, Ming-Qing Hua, Yan-Hong Chao, Ning Yang, Lin-Lin Chen, Wei Jiang, Lei Fan, Hong-Bing Ji, Wen-Shuai Zhu
Summary: A metal-free N-hydroxyphthalimide/hexagonal boron nitride (NHPI/h-BN) catalytic system was developed for deep oxidative desulfurization (ODS) of fuel oils. The loading of NHPI on h-BN not only improves the dispersion and utilization of NHPI, but also enhances the catalytic performance. The NHPI/h-BN catalyst, together with azodiisobutyronitrile (AIBN) as the metal-free initiator, achieves a 95% conversion of dibenzothiophene (DBT) under specific reaction conditions. The heterogenization process facilitates the regeneration of the catalyst, with >94% DBT conversion after being recycled seven times.
Article
Engineering, Chemical
Jing Luo, Chao Wang, Jixing Liu, Yanchen Wei, Yanhong Chao, Yiru Zou, Liping Mu, Yan Huang, Huaming Li, Wenshuai Zhu
Summary: Novel aerogel-like boron carbon nitride (BCN) materials with excellent desulfurization capacity were prepared through a hydrogel template and freeze-casting strategy. The BCN aerogels exhibited superior adsorption performance and selective adsorption characteristics for removing aromatic organosulfur compounds. This study also revealed heterogeneous adsorption mechanisms on BCN aerogels through pi-pi and Lewis acid-base interactions, indicating their potential for efficient sulfur removal in fuel refining processes.
Article
Engineering, Environmental
Hongping Li, Hongshun Ran, Yujun Li, Naixia Lv, Jie Yin, Jinrui Zhang, Chao Wang, Wei Jiang, Wenshuai Zhu, Huaming Li, Hongbing Ji
Summary: Heteroatom doping is an effective strategy to improve adsorbents' performance. A comparative study of halogen-doped hexagonal boron nitride materials using DFT and quantum analytic methods shows that the doping stability is related to specific sites with edge_B being the most stable. Higher content of halogen-doped h-BN also leads to improved desulfurization performance due to additional X...H-C hydrogen bonding interactions while maintaining pi-pi interactions.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Chemical
Lu Zhang, Jixing Liu, Deqi Huang, Wenfeng Zhang, Linjie Lu, Mingqing Hua, Hui Liu, Huifang Cheng, Huaming Li, Wenshuai Zhu
Summary: Particle size plays a vital role in the electronic and geometric structure of metal nanoparticles and influences their catalytic performances. Achieving precise control over the size and catalytic activities of active metal nanoparticles in ultra-deep oxidative desulfurization (ODS) remains a challenge. In this study, highly efficient VOx/boron nitride nanosheets@TiO2 heterostructures with various sizes of VOx nanoparticles were designed and constructed using a facile intercalation confinement strategy. The catalytic activities of these catalysts were systematically investigated for the aerobic ODS of dibenzothiophene (DBT). The results indicate that the size of VOx nanoparticles and the V5+/V4+ ratio play significant roles in the catalytic activity of VOx/boron nitride nanosheets@TiO2 catalysts.
FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Wenwen Lin, Hao Chen, Gaobo Lin, Siyu Yao, Zihao Zhang, Jizhen Qi, Meizan Jing, Weiyu Song, Jing Li, Xi Liu, Jie Fu, Sheng Dai
Summary: In this study, a defective boron carbon nitride catalyst was developed, which achieved high Faraday efficiency and ammonia yield, and had long-term durability.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Energy & Fuels
Liping Mu, Jing Luo, Chao Wang, Jixing Liu, Yiru Zou, Xiaowei Li, Yan Huang, Peiwen Wu, Haiyan Ji, Wenshuai Zhu
Summary: The hybrid nanocomposite exhibits excellent desulfurization performance and impressive adsorption capacity for different types of sulfides, showing great potential for applications in various fields.
Article
Energy & Fuels
Liping Mu, Jing Luo, Chao Wang, Jixing Liu, Yiru Zou, Xiaowei Li, Yan Huang, Peiwen Wu, Haiyan Ji, Wenshuai Zhu
Summary: The hybrid nanocomposite exhibits excellent desulfurization performance and impressive adsorption capacity for different types of sulfides, showing great potential for applications in various fields.
Article
Engineering, Chemical
Jing He, Guangyu Jia, Peiwen Wu, Yingcheng Wu, Hongping Li, Linjie Lu, Zhendong Yu, ShuaiShuai Zhou, Wenshuai Zhu, Huaming Li
Summary: A highly efficient desulfurizer has been developed by constructing a catalyst coupling W18O49 nanoneedles with Pt species, which effectively promotes the oxidation conversion of dibenzothiophene in the process of catalytic reactive-type desulfurization. The catalyst exhibits efficient, stable regeneration, and reusability.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Energy & Fuels
Shuaishuai Zhou, Jing He, Peiwen Wu, Lianwen He, Duanjian Tao, Linjie Lu, Zhendong Yu, Linhua Zhu, Yanhong Chao, Wenshuai Zhu
Summary: Encapsulating phosphomolybdic acid into a metal-organic framework improves the stability and activity of the oxidative desulfurization catalyst, showing excellent performance in treating the most stubborn sulfides in fuel oil. The catalyst can be recycled multiple times and the oxidizing product can be well separated, indicating promising potential for real diesel desulfurization.
Article
Chemistry, Inorganic & Nuclear
Peiwen Wu, Yang Sun, Linlin Chen, Qingdong Jia, Jing He, Wenhui Ma, Linjie Lu, Yanhong Chao, Lei Fan, Wenshuai Zhu
Summary: Carbon-based catalysts doped with boron were synthesized using a heteroatom bridging strategy, which demonstrated enhanced catalytic performance for oxidative desulfurization of fuel oil. The presence of boron atoms as bridges for electron transfer significantly improved the activation of oxygen by graphite, leading to ultradeep oxidative desulfurization. Furthermore, the catalyst showed good recyclability with no significant decrease in desulfurization performance after five cycles.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Ning Yang, Linjie Lu, Linhua Zhu, Peiwen Wu, Duanjian Tao, Xiaowei Li, Jiahong Gong, Linlin Chen, Yanhong Chao, Wenshuai Zhu
Summary: The novel PIL HPMo@ZIF-8-PIL shows efficient removal of dibenzothiophene sulfur in model oil under room temperature using hydrogen peroxide as the catalyst and oxidant. It promotes dispersion of catalytically active sites and retains good liquidity and excellent extraction ability of ionic liquids. The successful preservation of porosity increases the probability of contact between the oxidant and active sites, enhancing desulfurization performance.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Review
Engineering, Environmental
Jie Zhu, Peiwen Wu, Yanhong Chao, Jiangtao Yu, Wenshuai Zhu, Zhichang Liu, Chunming Xu
Summary: Three-dimensional (3D) printing is revolutionizing the design and manufacturing of 3D objects by transforming digital models into solid models. In the field of catalysis, 3D printing technology offers new possibilities and is widely applied in related catalytic reactions and processes.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Xiang Gao, Wei Jiang, Xin An, Kun Zhu, Linhua Zhu, Peiwen Wu, Wenshuai Zhu, Huaming Li
Summary: NHPI/PC catalysts, loaded with organic molecular catalyst NHPI on the surface of petroleum coke-based porous carbon, showed high efficiency and recyclability in aerobic oxidative desulfurization of model diesel oil under optimal conditions. The catalyst exhibited strong adsorption of oxidative products, resulting in a significant decrease in sulfur content. Free radical trapping experiments confirmed the presence of superoxide radicals as the main active species. Reusability tests demonstrated the catalyst's potential for industrial application after 9 cycles. Actual diesel oil sulfur content could be reduced from 852 mg kg(-1) to 91 mg kg(-1) with the catalyst, indicating promising industrial prospects.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Engineering, Chemical
Peiwen Wu, Penghui Liu, Linlin Chen, Wenhui Ma, Linhua Zhu, Mingyang Liu, Jing He, Linjie Lu, Yanhong Chao, Wenshuai Zhu
Summary: Noble-metal alloy nanoparticles have been successfully engineered with TiO2 support, which not only reduces the consumption of noble metals but also enhances catalytic performance. The AuCu/TiO2 catalyst exhibits high activity for sulfur removal in catalytic oxidative desulfurization of liquid fuels, even in the presence of interferents. The synergistic effect between Au and Cu, achieved by alloying, contributes to the boosted catalytic activity.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Energy & Fuels
Jiahong Gong, Huanhuan Xu, Jixing Liu, Hui Liu, Mingqing Hua, Ning Yang, Peiwen Wu, Huaming Li, Wenshuai Zhu
Summary: In this study, a highly efficient catalyst (C4@HPA) was used to reduce the sulfur content in high-sulfur petroleum coke. The results showed that only sulfates were removed, while sulfides and sulfoxides were retained in the coke. Additionally, it was found that sulfur in 4-MDBT was the most difficult to remove.
PETROLEUM SCIENCE AND TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Qiaomin Lu, Dong Yan, Peiwen Wu, Li Chen, Abu ElGasim A. Yagoub, Qinghua Ji, Xiaojie Yu, Cunshan Zhou
Summary: In this study, a ultrasound-NATDES/DMSO system was used to transform corn straw into high-value platform compounds. The reaction parameters were optimized and the yields of the target compounds were significantly increased. This low-cost and environmentally friendly method provides a novel strategy for the utilization of agricultural waste.
Article
Chemistry, Physical
Jing Luo, Ming Yan, Haiyan Ji, Liping Mu, Yan Huang, Linhua Zhu, Yiru Zou, Chao Wang, Peiwen Wu, Yanhong Chao, Wenshuai Zhu
Summary: This study successfully synthesized Ce@C-BN materials through a direct pyrolysis strategy, which exhibited high specific surface area and excellent adsorption performance for desulfurization. The presence of Ce-MOFs not only provided active sites but also enhanced the interaction between Ce and BN.
APPLIED SURFACE SCIENCE
(2022)
Article
Energy & Fuels
Jing He, Yingcheng Wu, Peiwen Wu, Haiyan Huang, Wei Jiang, Wenshuai Zhu, Huaming Li
Summary: Developing efficient catalysts for aerobic oxidation desulfurization has always been a promising technology for purifying diesel fuels. Platinum (Pt) catalysts show potential performance for the selective oxidation of sulfides, although the scarcity and high cost of Pt limit its large-scale development. Alloying Pt is considered to be an effective strategy to reduce the platinum load and increase the high catalytic activity. The researchers successfully prepared highly dispersed PtFe nanoalloys coupled with defect-rich W18O49 nanomaterials, which showed excellent yields of up to 99% for 4,6-dimethyldibenzothiophene.
Article
Chemistry, Inorganic & Nuclear
Jixing Liu, Chang Deng, Xiangqi Liu, Shijia Shao, Peng Zheng, Linlin Chen, Peiwen Wu, Huaming Li, Hongbing Ji, Wenshuai Zhu
Summary: A single-site Mo-supported HEPO LaMn0.2Fe0.2Co0.2Ni0.2Cu0.2O3 catalyst with abundant mesoporous structures was prepared, exhibiting stable recycling and exceptional catalytic activity for the oxidation of DBT and its derivatives. This finding expands the application of single-atom Mo-supported HEPO materials into the field of ultra-deep oxidative desulfurization.
INORGANIC CHEMISTRY
(2023)
Article
Polymer Science
Peng Cui, Fangfang Zhang, Dongni Liu, Jie Zhu, Yafei Yuan, Yan Huang, Yanhong Chao, Peiwen Wu, Wenshuai Zhu, Zhichang Liu
Summary: The adsorption of polycyclic aromatic hydrocarbons (PAHs) from fluid catalytic cracking (FCC) diesel using carbazole-based porous organic polymers was studied. Ag(I) doping and direct carbonization were employed to enhance the adsorption capacity of PAHs. The carbonized P1-C-1000 exhibited high surface area and excellent PAH adsorption capacity due to its high porosity and conjugated interaction.
Article
Chemistry, Multidisciplinary
Xiao Jiang, Xuanyu Zhang, Stephen C. Purdy, Yang He, Zhennan Huang, Rui You, Zeyue Wei, Harry M. I. I. I. I. I. I. Meyer, Jiuzhong Yang, Yang Pan, Peiwen Wu, Wenshuai Zhu, Miaofang Chi, Katharine Page, Weixin Huang, Zili Wu
Summary: We report a catalyst with vanadium oxide dispersed onto hexagonal boron nitride (h-BN), which catalyzes the oxidative dehydrogenation of propane (ODHP) via the Eley-Rideal mechanism and the Mars-van Krevelen mechanism. The results show that loading 0.5wt% V significantly improves the yield of light alkene. Adding an appropriate concentration of nitric oxide further enhances the catalytic performance. This provides a potential strategy for developing efficient h-BN-based catalysts for ODHP by coupling gas-phase and surface reactions.
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)
