Article
Energy & Fuels
Mingyue Wang, Feifei Li, Qing Chen, Weijie Cai
Summary: This study investigated the promotional effect of Mn dopant on the Co/CeO2 catalyst in ethanol dry reforming, showing that the presence of Mn species could improve the physicochemical properties of the catalyst and enhance its catalytic activity and stability.
Article
Chemistry, Multidisciplinary
Zhi-Yan Guo, Chen-Xuan Li, Miao Gao, Xiao Han, Ying-Jie Zhang, Wen-Jun Zhang, Wen-Wei Li
Summary: The covalency of TM-O bonds plays a critical role in governing the intrinsic catalytic activity of bimetallic spinel oxides, enhancing electron transfer and favoring interactions with PMS. By balancing PMS adsorption and metal reduction reactions, remarkable catalytic activities for PMS activation and pollutant degradation can be achieved, leading to the development of more active and robust metal oxide catalysts.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Green & Sustainable Science & Technology
Dalia R. Abd El-Hafiz, A. A. E. Sakr, Mohamed A. Ebiad
Summary: The research aims to synthesize ethanol directly from methane through a single-step catalytic process using smart nano-structured spinel ferrite catalysts prepared with ultrasonic assistance. The catalysts demonstrate high catalytic activity and stability at high temperatures, with Cu-Fe and Mn-Fe showing different selectivity towards liquid and gas products, respectively. The chemical looping step is utilized to achieve ultra-stable SCMR reaction with steam activation for catalyst re-oxidation and carbon removal.
Article
Energy & Fuels
Azita Etminan, S. K. Sadrnezhaad
Summary: In this study, mesoporous monometallic and bimetallic catalysts were synthesized and characterized. The results showed that the bimetallic catalyst had higher conversion and lower carbon deposition in methane steam reforming. The study also suggested that highly dispersed active Ni species might play an important role in the catalyst activity and resistance to coking in the reaction.
Article
Chemistry, Physical
Tatiana Priamushko, Patrick Guggenberger, Andreas Mautner, John Lee, Ryong Ryoo, Freddy Kleitz
Summary: In this study, highly ordered mesoporous mixed metal oxides were synthesized using the nanocasting technique and low-temperature calcination in a quasi-sealed container. The resulting electrocatalysts exhibited improved electrocatalytic properties for water splitting reactions in alkaline media.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Artit Ausavasukhi, Nattanitcha Krukrathok, Pancheewa Singthaisong
Summary: The thermal transformation of copper incorporated hydrotalcite-derived oxides was investigated for ethanol dehydrogenation. Among the catalysts tested, c-10Cu/HT600, prepared by impregnation of thermally treated hydrotalcite at 600 degrees C with Cu(NO3)(2) solution followed by calcination, exhibited high catalytic activity, selectivity, and stability. The nature of the copper species was found to depend on the thermal treatment process and support, with high temperature treatment leading to a homogeneous dispersion of mixed metal oxide. The incorporation of copper generated a CuAl2O4 spinel structure that suppressed copper agglomeration, contributing to the catalytic stability.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Physical
Wang Wang, Ershuai Liu, Youcheng Hu, Li Jiao, Praveen Kolla, Yucheng Liu, Meihua Tang, Jin Luo, Qiang Sun, Shengli Chen, Qingying Jia, Sanjeev Mukerjee
Summary: This study investigates the nature of the active sites in a CoMn2O4 catalyst, revealing the superior activity of Co-Mn spinel oxides is related to the Mn2+/Mn3+ redox transition, which is significantly affected by the operating potential window. This irreversible activity decay is proposed to be caused by the irreversible change of the Jahn-Teller distortion during the Mn2+/Mn3+ transition.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Engineering, Environmental
Longlong Zhang, Jiabin Chen, Tinglu Zheng, Yao Xu, Tongcai Liu, Wenjun Yin, Yalei Zhang, Xuefei Zhou
Summary: Through the study of different ratios of cobalt-manganese spinel oxides (Co-Mn spinel oxides), Co1.1Mn1.9O4 was found to exhibit excellent performance in the activation of peracetic acid (PAA), outperforming most reported heterogeneous catalysts. Acetylperoxyl radical (CH3C(O)OO?) was identified as the predominant oxidizing species responsible for the degradation of sulfamethoxazole (SMX). Doping with manganese not only promoted electron transfer and accelerated reduction of cobalt(III) to cobalt(II), but also lowered the energy barrier for PAA activation. Additionally, the presence of chlorine greatly facilitated SMX degradation. This research provides new insights into bimetallic activation of PAA and advances the application of PAA-based AOPs.
Article
Engineering, Chemical
Xiaoyu Zhang, Yongjie Shen, Yuying Liu, Jiajia Zheng, Jiang Deng, Tingling Yan, Danhong Cheng, Dengsong Zhang
Summary: Researchers constructed a composite of layered metal oxides (NiMgAlOx) and boron nitride (BN) to form interface-confined NiMgAlOx/BN catalysts, which showed excellent sintering resistance and activation capacity of CH4 and CO2. The triple interface significantly enhanced gas activation and inhibited coke formation, making it promising for methane dry reforming.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Zepan Wang, Peiyuan Wu, Xubing Zou, Sheng Wang, Lei Du, Ting Ouyang, Zhao-Qing Liu
Summary: By partially replacing Co3+ with the more electro-negative Mn3+ ion at the octahedral site, a ternary Zn-Mn-Co spinel oxide is formed, leading to a significant increase in electrocatalytic oxygen reduction/evolution activity. Physical characterization and theoretical calculations show that bond competition plays a crucial role in regulating the cobalt valence state and the electrocatalytic activity. The partial replacement of Co3+ by Mn3+ effectively modulates the adjacent Co-O bond and induces the Jahn-Teller effect, resulting in a change in crystal structure and optimization of the binding strength with reaction intermediates. The Mn-substituted ZnMn1.4Co0.6O4/NCNTs exhibit higher electrocatalytic activity than ZnCo2O4/NCNTs and ZnMn2O4/NCNTs, indicating that the covalency of the Co-O bond determines the oxygen reduction reaction (ORR) activity of spinel ZnCo2O4. This study introduces the competition between adjacent Co-O and Mn-O bonds through the B-Oh-O-B-Oh edge-sharing geometry, demonstrating that ion substitution at octahedral sites with less electronegative cations can effectively enhance the electrocatalytic performance of cobalt-based spinel oxides.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Environmental
Liyun Song, Shilin Deng, Chunyi Bian, Cui Liu, Zongcheng Zhan, Shuangye Li, Jian Li, Xing Fan, Hong He
Summary: Microwave-assisted selective catalytic reduction of nitrogen oxides (NOx) was investigated over Ni-based metal oxides. The NiMn2O4 and NiCo2O4 catalysts synthesized by the co-precipitation method showed high catalytic efficiency for low-temperature NH3-SCR in a microwave field. The results revealed that microwave radiation reduced the reaction temperature required for NH3-SCR, and the NiMn2O4 catalyst exhibited excellent performance under both microwave and conventional heating conditions due to its specific surface area, redox property, NO adsorption-desorption capability, and acidic sites.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2023)
Article
Chemistry, Physical
Peiqi Chu, Saifei Wang, Shiguang Zhao, Yi Zhang, Yanan Guan, Jiguang Deng, Li'an Hou, Erhong Duan
Summary: The novel La-B-O-C composites were fabricated as catalysts for methane catalytic combustion at low temperature. Three metal ions (Co, Mn, Fe) were selected for experiment based on the effect of the newly formed C-O bond on B-site ions as active sites. The study showed that different metal ions had varying effects on the physicochemical properties and catalytic performance of the composites, with LC-C and LF-C showing superior performance compared to unmodified catalysts, while LM-C showed a slight decrease in performance. Sacrifice of Mn4+ in LM-C was found to weaken the catalytic activity. Mechanistic differences for different B-site elements in the La-B-O-C were also observed.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Applied
S. Todorova, J. L. Blin, A. Naydenov, B. Lebeau, D. Karashanova, H. Kolev, P. Gaudin, R. Velinova, L. Vidal, L. Michelin, L. Josien, D. Filkova, I. Ivanova, A. Dotzeva, K. Tenchev
Summary: The hierarchical macro-mesoporous silica (MMS) was used for catalyst support for oxidation reactions. The MMS was synthesized by the emulsions templating mechanism and modified separately or simultaneously with cobalt and manganese oxides. The modified materials showed partially blocked pores due to the oxides, with Co3O4 agglomerates and amorphous manganese oxide filling up the mesopores.
Article
Chemistry, Multidisciplinary
T. F. Sheshko, T. A. Kryuchkova, L. V. Yafarova, E. M. Borodina, Y. M. Serov, I. A. Zvereva, A. G. Cherednichenko
Summary: This study investigated the effect of substituting cobalt for iron in perovskite-type oxides GdCoxFe1-xO3 on their physical properties and catalytic performance in dry reforming of methane (DRM). It was found that the introduction of cobalt can improve catalytic performance and decrease the process temperature. The catalytic activity increases with the proportion of cobalt.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2022)
Article
Chemistry, Physical
Wanlu Zhang, Mingyang Li, Xiaotong Wang, Xuewei Zhang, Xiaoyu Niu, Yujun Zhu
Summary: In this study, spherical Mn-doped Co3O4 spinet catalysts were successfully prepared and showed optimal catalytic activity and stability for toluene combustion. The catalysts exhibited increased amounts of surface Co2+, Mn(4+) and lattice oxygen, leading to enhanced oxidation ability. The formation of surface Mn-O-Co bonds improved the mobility of surface oxygen. In addition, the catalytic combustion followed the Mars-van Krevelen mechanism and surface lattice oxygen played a crucial role in the cycle of oxygen species.
APPLIED SURFACE SCIENCE
(2022)
Article
Biotechnology & Applied Microbiology
John Popovich, Shaojiang Chen, Natalie Iannuzo, Collin Ganser, Dong-Kyun Seo, Shelley E. Haydel
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2020)
Article
Chemistry, Multidisciplinary
Alireza Samieadel, Shaojiang Chen, David Ciota, Dong-Kyun Seo, Kamil E. Kaloush, Elham H. Fini
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2020)
Article
Chemistry, Physical
Pranjali J. Naik, Puranjan Chatterjee, Shaojiang Chen, Wenyu Huang, Igor I. Slowing
Summary: Size-controlled Pd nanoparticles were successfully synthesized in the pores of mesoporous silica nanoparticles, showing higher catalytic activity in the Suzuki-Miyaura cross-coupling and hydrogenation reactions compared to larger nanoparticles. The enhanced activity can be attributed to the increased number of coordinatively unsaturated sites and higher back donation capacity of the smaller nanoparticles.
Article
Chemistry, Applied
Gheorghita Mitran, Shaojiang Chen, Kevin L. Dolge, Wenyu Huang, Dong-Kyun Seo
Summary: The study found that in the esterification reaction of cyclohexanol with propionic acid, the sample with the highest specific surface area, highest mesopore volume, and highest Bronsted acidity achieved the highest cyclohexyl propionate yield; whereas in the ketonic decarboxylation of propionic acid, the catalyst with the lowest ratio of Bronsted acid sites to Lewis acid sites exhibited the highest activity and selectivity.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Biotechnology & Applied Microbiology
Gheorghita Mitran, Shaojiang Chen, Wenyu Huang, Dong-Kyun Seo
Summary: La-based zeolites have been studied for acetic acid conversion, with Bronsted acid sites promoting cyclohexyl acetate and acetone selectivity, while Lewis acidity favors acetone transformation into isobutene. The sample with the highest Bronsted acidity, La-H-13X, showed the highest activity for both reactions, indicating the importance of Bronsted acidity in the studied reactions.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2021)
Article
Chemistry, Physical
Carla Casadevall, Haojie Zhang, Shaojiang Chen, Dayn J. Sommer, Dong-Kyun Seo, Giovanna Ghirlanda
Summary: The immobilization of Co-protoporphyrin IX (Co-PPIX) substituted cytochrome c (Co-cyt c) on Antimony-doped Tin Oxide (ATO) as a catalyst for photoelectrochemical oxidation of water was reported. The ATO-Co-cyt c photoanode exhibited significantly enhanced photocurrent density and good stability, demonstrating its potential for light-induced water oxidation.
Article
Energy & Fuels
Gheorghita Mitran, Adriana Urda, Octavian-Dumitru Pavel, Stefan Neatu, Mihaela Florea, Florentina Neatu
Summary: A series of cobalt-iron mixed oxides were synthesized and tested as catalysts for the oxidative decarboxylation of malic acid. The Co3Fe sample showed the highest conversion and yield, which could be attributed to the increased number of defects caused by the substitution of Co2+ for Fe3+.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Chemistry, Multidisciplinary
Gheorghita Mitran, Tam Le Phuong Nguyen, Dong-Kyun Seo
Summary: In this study, CoAl2O4 samples were synthesized using sol-gel method with different complexing agents. The presence of oxalic acid as a complexation agent favors the expansion of Co3O4 phase. In the presence of citric acid as a complexing agent, CoAl2O4 is the dominant phase. The catalytic performances of CoAl2O4 spinel oxides were evaluated and showed good relationship with the Co3+/Co2+ ratio, reactants conversion, and products yield.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Engineering, Chemical
Gheorghita Mitran, Luiza Izabela Jinga, Gianina Florentina Popescu-Pelin, Octavian Dumitru Pavel
Summary: The presence of tetrahedral sites leads to high selectivity towards pyruvic acid, while the presence of octahedral sites facilitates the further conversion of pyruvic acid into acetic acid with a high reaction rate.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Chemistry, Physical
Shaojiang Chen, Akalanka Tennakoon, Kyung-Eun You, Alexander L. L. Paterson, Ryan Yappert, Selim Alayoglu, Lingzhe Fang, Xun Wu, Tommy Yunpu Zhao, Michelle P. P. Lapak, Mukunth Saravanan, Ryan A. A. Hackler, Yi-Yu Wang, Long Qi, Massimiliano Delferro, Tao Li, Byeongdu Lee, Baron Peters, Kenneth R. R. Poeppelmeier, Salai C. C. Ammal, Clifford R. R. Bowers, Frederic A. Perras, Andreas Heyden, Aaron D. D. Sadow, Wenyu Huang
Summary: Non-reducible zirconia catalysts can efficiently hydrogenolytically cleave polyolefins, achieving similar activity as precious metal nanoparticles.
Article
Chemistry, Physical
Gheorghita Mitran, Stefan Neatu, Octavian Dumitru Pavel, Adriana Urda, Anca G. G. Mirea, Mihaela Florea, Florentina Neatu
Summary: Iron-doped Co3O4 oxides prepared by a surfactant-assisted method showed good catalytic activity in malic acid conversion, with oxygen defects and the presence of Co2+ playing a key role in catalyst activation for pyruvic acid production. The most active catalyst, with a conversion rate of 70% for malic acid and a yield of 24% for pyruvic acid, had an inverse spinel structure and a low band-gap. The catalyst with the highest Co2+ loading exhibited the highest yield of pyruvic acid.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Gheorghita Mitran, Tam Le Phuong Nguyen, Dong-Kyun Seo
Summary: This study synthesized CoAl2O4 spinel using the sol-gel method with different solvents and precursors. The structure and optical properties were characterized through various analyses. The presence of excess aluminum in catalysts synthesized with methanol and butanol as solvents resulted in decreased activity in the lactonization reaction. The active sites in the dehydrocyclization reaction were confirmed to be Co3+ sites and oxygen vacancies.
REACTION CHEMISTRY & ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Akanksha Singh, Sarthak Mandal, Shaojiang Chen, Minghui Liu, Christopher J. Gisriel, Anne-Marie Carey, Hao Yan, Dong-Kyun Seo, Su Lin, Neal W. Woodbury
Summary: A biohybrid electronic system has been developed with a photosystem I (PSI) fixed on a porous antimony-doped tin oxide electrode, resulting in light-powered reduction of NADPH. Cytochrome c was used to orient PSI reaction centers and transport electrons, generating a photocurrent. Despite attempts to catalyze dye reduction by NADPH, dye reduction occurred even without enzymes, with direct light-dependent reduction of NADPH and subsequent reduction of resazurin.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
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)
