Article
Engineering, Chemical
Xiaohua Cao, Tianhao Ai, Zhizhi Xu, Jichang Lu, Dingkai Chen, Dedong He, Jiangping Liu, Rui Tian, Yutong Zhao, Yongming Luo
Summary: High sulfur resistance and stability of catalysts are crucial for catalytic decomposition of sulfur-containing volatile organic compounds. Compared to 5Ce-MCM-41, the 5Cr-MCM-41 catalyst showed ultra-stability and higher sulfur resistance. The excellent catalytic performance of the 5Cr-MCM-41 catalyst is attributed to its superior reducibility and appropriate acidity, which promote the conversion of C and S elements in CH3SH to gas-phase coke- and sulfur-containing products.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Daohao Li, Binbin Wang, Xiaojing Long, Wenjia Xu, Yanzhi Xia, Dongjiang Yang, Xiangdong Yao
Summary: Introducing an asymmetry strategy by designing conjugated polymer catalysts with different degrees of asymmetry can adjust the charge distribution of active centers, leading to improved catalytic activity in the oxygen reduction reaction.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Bin Yu, Wei Wang, Wenbo Sun, Chunhuan Jiang, Lehui Lu
Summary: This study demonstrates the development of a simple yet efficient redox nanozyme through defect engineering, which enhances binding capacity and catalytic activity, leading to substantial disruption of redox and metabolism homeostasis in the tumor region.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Juan Bai, Jun Mei, Jing Shang, Xin Mao, Dongchen Qi, Ting Liao, Aijun Du, Ziqi Sun
Summary: It is well known that the activity of electrocatalytic oxygen evolution reaction (OER) depends on the active centers of electrocatalysts. In this study, molybdenum oxide catalysts were used as a representative model and it was found that the inactive molybdenum sites can be regenerated as synergistic active centers for promoting OER through phosphorus-modulated defective engineering. The optimal catalyst achieved an overpotential of 287 mV for a current density of 10 mA cm(-2) with only 2% performance decay after 50 hours of continuous operation. This work provides insights into activating inert metal sites on oxide catalysts to enhance their electrocatalytic properties.
Article
Chemistry, Multidisciplinary
Xuelin Sheng, Zhiyuan Mei, Qi Jing, Xiaoxiao Zou, Lilian Wang, Qijun Xu, Li Yang, Hong Guo
Summary: Effective adjustment of the internal electron spin state and the external charge density of metal-nitrogen complex carbon (M/NC) electrocatalysts is crucial for enhancing their catalytic activity. In this study, a FeMn/NC dual-atom catalyst with a FeN4-MnN4 local structure is synthesized, showing excellent oxygen reduction reaction (ORR) performance in acidic, neutral, and alkaline environments. The Zn-air battery based on the FeMn/NC catalyst exhibits high open-circuit voltage, satisfactory output power density, and strong charge-discharge stability, outperforming commercial Pt/C. The exceptional catalytic performance is attributed to the modification of charge environment and the transition of the 3d orbital spin state at the metal center, demonstrated by density functional theory calculations. This work provides valuable insights into the rational design of bimetallic catalysts with remarkable ORR capability.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Physical
Olivia C. Williams, Carsten Sievers
Summary: Currently, there is no clear consensus on the active oxygen species in heterogeneous catalyzed hydrocarbon oxidation reactions, and more effective methods for characterization and quantification are needed. While several methods are effective for describing certain oxygen species, there is no method that comprehensively characterizes all active oxygen species. The most promising approach is oxygen isotope exchange coupled with infrared spectrometry and inline mass spectrometry.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Energy & Fuels
Bikashbindu Das, Ahmed Magdy Abdelaziz Ahmed, Josephine M. Hill, Sathish Ponnurangam
Summary: The use of metal-free carbonaceous catalysts for oxidative desulfurization faces limitations due to their low activation efficiency and researchers have explored peroxide-assisted oxidation as an alternative. In this study, a novel carbonaceous metal-free catalyst was synthesized from petcoke, a waste product from oil refining, through boron doping. The catalyst showed high sulfur removal efficiency and the doping-induced defects were identified as active sites for oxygen activation. The study provides insights into the development of efficient sulfur removal catalysts.
Article
Energy & Fuels
Bikashbindu Das, Ahmed Magdy Abdelaziz Ahmed, Josephine M. Hill, Sathish Ponnurangam
Summary: This study investigates the use of a novel carbonaceous metal-free catalyst, synthesized from petcoke, for efficient sulfur removal from fuel through oxidative desulfurization. The results show that doping boron onto the surface of petcoke enhances the oxygen activation and leads to high conversion of refractory sulfur compounds. This research provides insights into the development of green catalysts for sulfur removal.
Article
Chemistry, Multidisciplinary
Qi Zhao, Lirong Zheng, Yixuan Gao, Jingjing Li, Juanjuan Wei, Min Zhang, Jianghui Sun, Jin Ouyang, Na Na
Summary: An aptamer-functionalized Pd@MoO3-x nano-hydrangea (A-Pd@MoO3-x NH) with dual active centers has been developed to overcome the adverse effects of the tumor microenvironment (TME) and achieve high-efficiency cancer therapy. This nanozyme can address tumor hypoxia and high endogenous glutathione (GSH) through cascade enzymatic reactions, catalyzing the degradation of GSH and mitigating the accumulation of cytotoxic superoxide radicals in TME.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Guilin Zhou, Shan Zhao, Fengqiong Xie, Shuang Chen, Hongmei Xie
Summary: Surface active centers, including metal Co, surface oxygen vacancies, and Co-0 CeO2- delta interface structures, can be constructed on mesoporous Co/CeO2- delta catalysts by wet impregnation method, and can be regulated by the dosage of Co species. The interaction between metal Co and CeO2- delta promotes the formation of surface oxygen vacancies and Co-0-CeO2- delta interface structures, inhibiting the aggregation and sintering of Co species at high temperatures. The synergistic effect between Co-0 active centers, surface oxygen vacancies, and Co-0-CeO2- delta interface structures in Co/CeO2- delta catalysts leads to improved catalytic performance for CO2 hydrogenation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Xiangyu Yan, Bingbing Wang, Jun Ren, Xiaojing Long, Dongjiang Yang
Summary: This study developed two metal-free covalent organic frameworks as catalysts to evaluate the effect of unsaturated bonds on the catalytic activity of the oxygen reduction reaction. The results showed that the vinyl-/azo-decorated COFs exhibited better performance than the control sample and comparable to most reported carbon catalysts. Theoretical calculations and experimental results revealed that the unsaturated bonds in the organic catalysts can produce para-activation and have a high affinity for oxygen intermediates.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Nanoscience & Nanotechnology
Darong He, Xinmei Ding, Shanshan Li, Yanli Liang, Yaxin Liu, Ming Zhao, Jianli Wang, Yaoqiang Chen
Summary: The study focused on the hydrothermal stability of NO oxidation reaction for the practical application of diesel oxidation catalysts. By constructing a metal/oxide interface and using YMO catalyst with excellent thermal stability, a Pt/YMO-LA catalyst with good NO oxidation performance was successfully prepared.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Yannan Xia, Yi Cheng, Rui Wang, Zihan Meng, Quentin Meyer, Chuan Zhao, Haining Zhang, Ren Luo, Yang Li, Haolin Tang
Summary: Porous nanosheets codoped with carbon-encapsulated FeNi alloy, metal-N species, and N defects (FeNi-N/PCN) were synthesized through a simple and environmentally friendly molten NaCl template method. The obtained FeNi-N/PCN showed impressive performances as an oxygen electrocatalyst for the ORR and OER in alkaline and acidic electrolytes. Furthermore, this FeNi-N/PCN catalyst exhibited outstanding power density and specific capacity in a Zn-air battery, surpassing the performance of Pt and RuO2 catalysts.
SCIENCE CHINA-MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Junyi Guo, Yexuan He, Yukun Yuan, Le Zhang, Yingfei Wang, Yali Zhou, Xiaohua Meng, Bin Liu, Heqing Yang
Summary: Hydrogenation was successfully used to enhance the responses of Cu0.27Co2.73O4 nanooctahedron sensors to acetone, ethanol, and n-butyl-amine by increasing the number of 3-coordinated Co/Cu atoms on the (111) plane. These active atoms function as gas response active centers by generating electrons, adsorbing oxygen from air, and catalyzing the sensing reactions.
Article
Chemistry, Multidisciplinary
Huanxin Li, Yongliang Wen, Min Jiang, Yong Yao, Haihui Zhou, Zhongyuan Huang, Jiawen Li, Shuqiang Jiao, Yafei Kuang, Shenglian Luo
Summary: The study reports FeCo-N-doped hollow carbon nanocages as efficient catalysts with neighboring Fe-N-4-C and Co-N-4-C dual active centers, showing better catalytic activity than Fe single-metal catalyst for oxygen reduction reaction. This highlights the important role of synergy between dual active centers in reducing the reaction energy barriers for ORR.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Ming-Yi Chen, Ngoc Thanh Thuy Tran, Ahmed Abubakar Alao, Wen-Dung Hsu
Summary: This study demonstrates the significance of surface Pt atom arrangement for the efficiency of ORR in PEMFCs and reveals the correlation between Pt-Pt average distance and O2 dissociation barrier. Furthermore, the study discovers a robust correlation between the level of the catalyst's d-band center and O2 adsorption energy. High-entropy alloy substrates provide potential for controlling Pt arrangement and O2 dissociation barrier.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Eduardo C. Atayde Jr, Babasaheb M. Matsagar, Yu-Cheng Wang, Kevin C. -W. Wu
Summary: This study presents the first application of an acidic MOF, Sulfated MOF-808, in catalyzing the HAA reactions of furan oligomers for the production of biofuel precursors. The catalyst showed high yield, selectivity, and recyclability, making it versatile for different starting materials.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Maria do Carmo Rangel, Francieli Martins Mayer, Soraia Jesus de Oliveira, Sergio Gustavo Marchetti, Fabricio Luiz Faita, Doris Ruiz, Giovanni Saboia, Mariana Kieling Dagostini, Jonder Morais, Maria do Carmo Martins Alves
Summary: This study developed a new catalyst by investigating the effect of magnesium on the catalytic properties of hematite in ethylbenzene dehydrogenation. The catalyst showed important differences in activity, selectivity, and stability, making it a promising candidate for commercial applications.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yanjun Li, Qian Wang, Hui Tian, Mingyuan Zhu, Yuanyuan Liu
Summary: A novel strategy using microwave-assisted precipitation was proposed to prepare defective CsH3PMo11VO40 catalyst for the oxidation of methacrolein to methacrylic acid. Microwave treatment accelerates crystallization, increases vanadyl species content, and forms defective Keggin structures, thereby enhancing the oxidation capacity of the catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Rajeshwari Athavale, Sailee Gardi, Fatima Choudhary, Dayanand Patil, Nandkishor Chandan, Paresh More
Summary: In this study, a novel acidic ionic liquid catalyst was prepared and used for the synthesis of bis-indolyl methane derivatives. The catalyst exhibited short reaction times, easy purification, and reusability.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Masatomo Hattori, Takato Hattori, Masakuni Ozawa
Summary: Cu-added gamma-Al2O3 catalysts were prepared with varying Cu loadings and the effects of copper oxidation states on catalytic activity were investigated. The results showed that the addition of copper increased the catalyst activity, but excessive copper loading decreased catalytic activity. XRD and TEM analysis indicated the formation of a solid solution of copper oxide species on the surface of gamma-Al2O3. XAS and TPR data demonstrated variations in copper oxidation states among the catalysts.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liwei Fang, Shiyang Niu, Shengsen Wang, Yiqing Lu, Yuanhui Cheng
Summary: In this study, PtNi alloy on nitrogen-doped carbon and SnO2 dual-support was designed to modulate the metal-support interaction, resulting in improved catalytic activity and stability for oxygen reduction reaction. The SnO2/PtNi/NC catalyst exhibited a strongly coupled interface, enhanced electron transfer, and higher half-wave potential compared to PtNi/NC and commercial Pt/C.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Shohei Harada, Duanxing Li, Kenta Iyoki, Masaru Ogura
Summary: This study investigates the catalytic performance of a composite catalyst composed of ZnZrOX and H-zeolite for the hydrogenation of CO2. The deactivation of the composite catalyst is influenced by ion exchange of Zn2+ and/or coke, with their effects differing based on the zeolite structure. Separating the grains of the composite catalyst can prevent deactivation.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Laura Proano, Christopher W. Jones
Summary: In this study, NiGa alloy particles supported on CeO2, ZrO2, and ZrO2-CeO2 solid solutions were prepared and characterized. The nature of the support was found to have a significant influence on the catalyst's activity and selectivity, with the crystalline structure of ZrO2 having the greatest impact. Pure ZrO2 showed the highest methanol selectivity and CO2 conversion at high Zr:Ce ratios. In equimolar and Ce-rich conditions, basic sites and oxygen vacancies were found to be the key parameters affecting methanol production.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liyan Zhang, Yinze Yang, Leilei Zhou, Fengyu Zhao, Haiyang Cheng
Summary: 1,6-Hexamethylenediamine was successfully synthesized via the reductive amination of 1,6-hexanediol using a Ru/PRL(x)-Al2O3 catalyst. The highly dispersed and anchored Ru species, formed by 1,10-phenanthroline (PRL), played a crucial role in the catalytic reaction. The formation of new acid-base pairs, electron deficient Ru species, and smaller nanoparticles contributed to the improved catalytic performances of the Ru/PRL-Al2O3 catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Anita Horvath, Miklos Nemeth, Andrea Beck, Gyorgy Safran, Valeria La Parola, Leonarda Francesca Liotta, Gregor Zerjav, Matevz Roskaric, Albin Pintar
Summary: This study investigates the catalytic and structural changes caused by the addition of 0.25 wt% indium in a 3% Ni/CeO2-Al2O3 catalyst prepared by impregnation method. The results show that the addition of indium can decrease the activity of the catalyst, but it improves its stability and reduces coking.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Ankush Kularkar, Vaibhav Vilas Khedekar, Sachin D. Chaudhari, Mudavath Ravi, Sadhana S. Rayalu, Penumaka Nagababu
Summary: Efficiently addressing the challenges of photocatalytic CO2 reduction to CH3OH is crucial. This study developed Zn-BTC MOF and its composites with CaIn2S4, achieving highly efficient and robust photocatalytic CO2 reduction to CH3OH under ambient conditions, using H2O2 as the hydrogen source. Among the composites, ZMCIS4 demonstrated excellent performance with a CH3OH evolution of 49100 μmol/g.cat and a quantum efficiency of approximately 78.41%. The enhanced performance was attributed to the production of nascent hydrogen atoms (H center dot) through the photo-splitting of H2O2 on the ZMCIS surface.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Dan Liu, Yudong Li, Chengyu Wang, Haiyue Yang, Rong Wang, Shujun Li, Xiaohui Yang
Summary: In this study, a self-supporting three-dimensional porous Co3O4 nanobelt array decorated on nickel foam (P-Co3O4 -NBA@NF) electrode with numerous active sites was successfully constructed for the oxidation of 5-Hydroxymethylfurfural (HMF) to 2,5-furan dicarboxylic acid (FDCA). The P-Co3O4 -NBA@NF electrode demonstrated high conversion efficiency, selectivity, and Faraday efficiency, as well as remarkable long-term stability. This research provides a promising electrocatalyst for biomass conversion.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yimin Li, Enggah Kurniawan, Fumiya Sato, Takayoshi Hara, Yasuhiro Yamada, Satoshi Sato
Summary: In this study, several silica-alumina catalysts modified with Ag were examined for the dehydration of 1,3-butanediol to 1,3-butadiene. Among them, an amorphous silica-alumina catalyst (SAL-3) modified with Ag showed the highest improvement in catalytic activity and stability when operated in H2 flow. The generation of reversible acid sites was found to be the reason behind the enhanced activity and stability of this Ag/SAL-3 catalyst. The effects of various parameters on the catalytic activity of Ag/SAL-3, such as reaction temperature, contact time, Ag content, and carrier gas, were investigated.
APPLIED CATALYSIS A-GENERAL
(2024)