Article
Multidisciplinary Sciences
Shubo Tian, Bingxue Wang, Wanbing Gong, Zizhan He, Qi Xu, Wenxing Chen, Qinghua Zhang, Youqi Zhu, Jiarui Yang, Qiang Fu, Chun Chen, Yuxiang Bu, Lin Gu, Xiaoming Sun, Huijun Zhao, Dingsheng Wang, Yadong Li
Summary: The study successfully prepared a mesoporous graphitic carbon nitride-supported dual-atom Pt-2 catalyst, which displayed excellent catalytic performance in the hydrogenation of nitrobenzene to aniline reaction, with a conversion rate higher than that of other comparative catalysts. This catalyst also shows potential applications in other important reactions.
NATURE COMMUNICATIONS
(2021)
Article
Engineering, Chemical
Luis A. Gallego-Villada, Edwin A. Alarcon, Aida Luz Villa
Summary: The products obtained from limonene epoxidation can be used as intermediates or precursors in organic and pharmaceutical synthesis. In this study, commercial magnesium oxide was evaluated as a heterogeneous catalyst in the epoxidation of limonene, showing high yields of limonene epoxide and diepoxide under certain conditions.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Songying Qu, Hao Wu, Yun Hau Ng
Summary: A ZnO passivator-coated BiVO4 photoanode is used for selective photoelectrochemical (PEC) synthesis of H2O2. The H2O2 selectivity and production rate increase under simulated sunlight irradiation in the range of 1.0-2.0 V versus RHE. The ZnO coating facilitates H2O2 generation, suppresses the competitive reaction of O-2 evolution, inhibits H2O2 decomposition, accelerates charge extraction from BiVO4, and serves as a hole reservoir under photoexcitation. This work provides insights into manipulating two/four-electron transfer for selective H2O2 synthesis from PEC water oxidation.
Article
Chemistry, Inorganic & Nuclear
A. Edwin Vasu, A. P. Mary Sri Archana, A. Christopher Sagayaraj, F. Fabiyan Reymond, V. Antony Jasmine, A. Tony Elizabeth
Summary: This study attempts to utilize biofluids available in plant biomass for uniform distribution of metal cation into carbonaceous precursor, exemplified by ferric in banana leaf sheath. The magnetic iron-oxide nanoparticles incorporated carbon composite prepared by this method shows higher magnetic saturation. The composites can be used as catalysts for the degradation of tetracycline antibiotics.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Biochemistry & Molecular Biology
Abdelhak Moumen, Youghourta Belhocine, Najoua Sbei, Seyfeddine Rahali, Fatima Adam Mohamed Ali, Fedia Mechati, Fouad Hamdaoui, Mahamadou Seydou
Summary: Natural Algerian kaolin was used as a support for impregnating nickel at different loading amounts to prepare supported catalysts. These catalysts were effective in degrading malachite green dye in catalytic wet peroxide oxidation process, achieving a high removal rate.
Article
Biotechnology & Applied Microbiology
Lili Xu, Yimin Qin, Yufeng Song, Aixing Tang, Youyan Liu
Summary: A green oxidation system containing hydrogen peroxide, Na3C6H5O7, an acyl donor, and glutaraldehyde(GA)-crosslinked cells of Rhizopus oryzae was developed for the epoxidation of alkenes. The catalytic performance of the crosslinked treated cells was substantially improved compared to that of the untreated cells, with a yield of 83% even after four batches of reactions. The addition of Na3C6H5O7 not only eliminates the negative effect of carboxylic acid but also affects the concentration of H2O2, thus impacting the epoxidation reaction.
MICROBIAL CELL FACTORIES
(2023)
Article
Chemistry, Multidisciplinary
Young Soo Yoon, Padmini Basumatary, Mehmet Emin Kilic, Yoo Lim Cha, Kwang-Ryeol Lee, Dong-Joo Kim, Dimpul Konwar
Summary: A novel nanosized GaPtMnP alloy anchored on N-doped multiwall carbon nanotubes was developed as an efficient electrocatalyst for ethanol fuel cells, exhibiting high activity and stability. It delivered mass and specific activities approximately 13- and 8-fold higher than Pt/C, with long-term stability and durability even after 3000 cycles. The fuel cell based on this catalyst showed a peak power density approximately fourfold higher than Pt/C, maintaining constant performance after multiple startup-shutdown cycles.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Langang Li, Kai Zhang, Wei Jin, Weiwei Xia, Junhui He, Xianghua Zeng
Summary: Designing nanostructured photoelectrodes with unique morphology and suitable band structure is essential for potential photoelectrochemical applications. In this study, compact Sn3O4 nanoflakes with a smooth surface were grown directly on a carbon paper substrate using a simple hydrothermal method. The molar ratio of Sn2+ and Sn4+ ions in the Sn3O4 nanoflakes was modulated through subsequent H2O2-assisted hydrothermal treatment. The effect of different molar ratios on the energy band and the evolution of the surface morphology of the nanoflakes were systematically investigated. By utilizing the H2O2-assisted hydrothermal process, a highly efficient photoelectrode based on Sn3O4 nanoflakes was prepared, exhibiting a larger active surface area and suitable band structure, leading to excellent photocurrent response and photocatalytic performance for H2 production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Biochemistry & Molecular Biology
Luis Gutierrez-Rus, Gloria Gamiz-Arco, J. A. Gavira, Eric A. Gaucher, Valeria A. Risso, Jose M. Sanchez-Ruiz
Summary: Enzymes catalyze the chemical reactions of life, and for nearly half of known enzymes, catalysis requires the binding of cofactors. This study identifies heme binding as a potential driver for the formation of ancestral polypeptide-cofactor complexes. Binding of heme to a flexible region in the ancestral structure enhances peroxidation catalysis by protecting the bound heme from degradation processes, resulting in a longer lifetime and higher effective concentration for the catalyst. This finding suggests that the protection of catalytic cofactors by polypeptides is a general mechanism to enhance catalysis and may have benefited primordial polypeptide-cofactor associations.
MOLECULAR BIOLOGY AND EVOLUTION
(2023)
Article
Engineering, Multidisciplinary
Behnam Seyyedi, Bafrin Shakhseh
Summary: This study introduces a Cobalt-rGO composite with excellent activity for converting oxygen to hydrogen peroxide and producing electrochemical energy. The composite exhibits good catalytic performance, economical synthesis method, high specific surface area, high selectivity, and electrochemical durability.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Tao Fu, Xiaobo Gong, Jinrui Guo, Zhao Yang, Yong Liu
Summary: The study successfully demonstrated the efficient degradation of high concentration 4-chlorophenol using a novel catalytic peroxide oxidation system, providing a new method and strategy for the treatment of refractory chlorophenols wastewater.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Chemistry, Physical
Yue Zhao, Yihuan Wang, Haibo Chi, Yanan Zhang, Chenglin Sun, Huangzhao Wei, Rengui Li
Summary: This study presents a coupling of CWPO and photocatalytic water oxidation using BiVO4 crystals, which efficiently circulate Fe3+ to Fe2+ and generate H2O2, resulting in significantly improved degradation of organic pollutants in wastewater treatment.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Multidisciplinary Sciences
Jaeho Yoon, Hanhwi Jang, Min-Wook Oh, Thomas Hilberath, Frank Hollmann, Yeon Sik Jung, Chan Beum Park
Summary: The authors demonstrate the direct conversion of low-grade waste heat into chemical energy using a combination of thermoelectric materials and biocatalysts. The results show that thermoelectric materials, such as bismuth telluride, can efficiently convert low-temperature waste heat into chemical energy and promote oxyfunctionalization reactions. This study highlights the feasibility of thermoelectrobiocatalysis in utilizing low-quality waste heat for practical applications.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Jeremy W. Arvay, Wei Hong, Christina Li, W. Nicholas Delgass, Fabio H. Ribeiro, James W. Harris
Summary: In this study, the difference in catalytic roles of extracrystalline and intracrystalline gold nanoparticles in direct propylene epoxidation was investigated. The results showed that the activation energy and reaction orders for propylene epoxidation were similar for both types of nanoparticles. However, the activation energy for hydrogen oxidation differed, indicating a change in rate-limiting step or active site. An active site model was developed to estimate catalytic turnover frequencies and it was found that the simultaneous mechanism occurring over proximal Au-Ti sites alone is not sufficient to explain the observed rate of propylene epoxidation, suggesting the kinetically relevant short-range migration of hydrogen peroxide. The study also found that the rates of hydrogen oxidation varied proportionally to the amount of surface gold atoms, indicating the importance of gold dispersion in the catalysts.
Article
Chemistry, Physical
Jeremy W. Arvay, Wei Hong, Christina Li, Fabio H. Ribeiro, W. Nicholas Delgass, James W. Harris
Summary: The catalytic roles of extracrystalline and intracrystalline gold nanoparticles on the direct propylene epoxidation were investigated, and it was found that there was no intrinsic difference between the two. The kinetics of the reaction were measured and the results were consistent with previous studies on intracrystalline gold nanoparticles. An active site model was developed and the estimated turnover frequencies were 20 times higher than previous estimates. The dispersion of gold was found to affect the rate of hydrogen oxidation.
