Article
Energy & Fuels
Fatemeh Zarei-Jelyani, Fatemeh Salahi, Mohammad Farsi, Mohammad Reza Rahimpour
Summary: Steam methane reforming is an important reaction for producing environmentally-friendly hydrogen from methane. In this study, Ni-Co co-impregnated catalysts were synthesized using a hollow sphere alumina support, leading to improved stability and performance. Among the catalysts tested, Ni-2-Co-1/H-Al2O3 showed the highest methane conversion and hydrogen yield at 700 ℃.
Article
Engineering, Chemical
Ahmad Zuhairi Abdullah, Natasha Ghazali, Peng Yong Hoo, Nor Irwin Basir
Summary: In this study, zirconia was incorporated into mesoporous MCM-41 support for the selective esterification of glycerol with fatty acid. The catalysts showed correlations between their characteristics and activity under different reaction conditions, with the precipitation method demonstrating more internal incorporation of the acidic component.
CHEMICAL ENGINEERING COMMUNICATIONS
(2022)
Article
Chemistry, Applied
Weican Wang, Teruoki Tago, Hiroyasu Fujitsuka
Summary: This study investigates the selective hydrodeoxygenation (HDO) of C3-4 polyols to diol products using Cu-based catalysts, including carbon-supported monometallic Cu@C and bimetallic MgCu@C. Cu particle size is reduced and metal dispersion is improved with the addition of Mg. The MgCu@C catalyst exhibits high conversion and selectivity for C3 polyols.
Article
Chemistry, Physical
Xiang Gong, Shuyi Guo, Zhao Jiang, Bolun Yang, Tao Fang
Summary: A series of Pd-M/Al2O3 bimetallic catalysts were successfully synthesized in this study, showing higher hydrogen release amount and NECZ selectivity by fine-tuning the alloy degree and nanoparticle size. The increase in NECZ selectivity mainly comes from the enhancement of the kinetic constant of the rate-limiting step.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Rafael Belo Duarte, Marcos Lucio Corazza, Joao Lourenco Castagnari Willimann Pimenta, Luiz Mario de Matos Jorge
Summary: A kinetic study of glycerol hydrodeoxygenation (HDO) on NiMo2C/Al2O3 and Al2O3 catalysts, prepared by sol-gel technique, was conducted at high glycerol concentration (95wt%) in a batch reactor, from 250 degrees C to 285 degrees C. The catalysts' structural and surface properties were characterized, and it was found that impregnation of alumina with Ni and Mo followed by carburization increased crystallite sizes and reduced total acidity. The reactions followed a zeroth order model and had no diffusion limitation. The main products were propanediols, ethylene glycol, long-chain molecules, as well as methane, ethane, and propane.
Article
Chemistry, Physical
Maolin Zhang, Zedong Zhang, Zhenghang Zhao, Hao Huang, Dalaver H. Anjum, Dingsheng Wang, Jr-hau He, Kuo-Wei Huang
Summary: Cu-Sn composite catalysts can be designed to selectively produce formate or CO by varying the Cu/Sn composition, thanks to the critical existence of small amounts of Cu or Sn single atoms in the catalysts.
Article
Energy & Fuels
Sha Li, Jiale Zhang, Bin Zhu, Wenju Wang
Summary: In this study, low-cost nickel catalysts supported on La, Ce, and Mg-promoted Al2O3 and ZrO2 were prepared and compared for hydrogen production from glycerol steam reforming. La-promoted Ni/Al2O3 catalyst exhibited the highest activity and stability, while Ce-promoted Ni/ZrO2 catalyst showed stable but lower carbon gasification efficiency due to the large Ni crystals over the bulk ZrO2 supports.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Physical
Dengfeng Wang, Dong Bai, Jie Xiong, Zheng Chen, Xueying Zhao, Hongwei Wu, Jianfeng Shan, Shuwei Wei, Xuelan Zhang
Summary: A series of Al2O3-ZrO2-nF solid solution catalysts with adjustable acidic-basic properties were fabricated by co-precipitation method. The catalyst with F/Al=1.0 exhibited appropriate acidic-basic property and achieved quantitative and selective transformation of glycerol to glycerol carbonate with a yield of 91.2%. The uniform solid solution structure ensured excellent stability of the catalyst.
APPLIED CATALYSIS A-GENERAL
(2023)
Article
Chemistry, Multidisciplinary
Chengrui Wang, Yanhong Fang, Guangfen Liang, Xiangyong Lv, Huamei Duan, Yandong Li, Dengfu Chen, Mujun Long
Summary: In this study, Cu-Ni bimetallic catalyst supported by graphene derivatives was used to convert CO2 to methanol. Different graphene derivatives affected the catalyst performance, with Cu-Ni catalyst on rGO showing higher active component. CuNi-rGO and CuNi-NGO could chemically activate more CO2 at lower temperature and reduce its activation energy.
JOURNAL OF CO2 UTILIZATION
(2021)
Article
Environmental Sciences
Thanapha Numpilai, Chin Kui Cheng, Anusorn Seubsai, Kajornsak Faungnawakij, Jumras Limtrakul, Thongthai Witoon
Summary: The study focused on the conversion of waste glycerol to 1,3-propanediol using Pt/WOx/Al2O3 catalysts, and found that the catalyst pore sizes and operating conditions significantly influenced the process. It was observed that while small-pore catalysts may have advantages in terms of active metal dispersion and acidity, they could also lead to diffusional restrictions and hinder the exposure of catalytic active sites, resulting in lower product yields.
ENVIRONMENTAL POLLUTION
(2021)
Article
Green & Sustainable Science & Technology
Pei San Kong, Yolande Peres, Patrick Cognet, Francois Senocq, Wan Mohd Ashri Wan Daud, Mohamed Kheireddine Aroua, Haniza Ahmad, Revathy Sankaran, Pau Loke Show
Summary: A novel catalytic technique was explored to produce mono- and dioleate (GMO and GDO) directly from bioglycerol, showing advantages over the conventional method. The performance of the designed catalyst was found to significantly influence product selectivity, with results indicating a correlation between pore volume and product sensitivity. Hydrophobicity of the catalyst was also identified as a factor improving the initial reaction rate.
CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY
(2021)
Article
Chemistry, Applied
R. J. Chimentao, P. Hirunsit, C. S. Torres, M. Borges Ordono, A. Urakawa, J. L. G. Fierro, D. Ruiz
Summary: The study found that Cu/ZrO2 catalyst exhibited the highest activity and apparent reaction rate in the dehydration of glycerol to hydroxyacetone process, attributed to the highly acidic support and positive roles of interfacial sites. The application of Weisz-Prater (WP) criterion confirmed the absence of intraparticle diffusion limitations, and DFT study suggested that the active sites are located at the interface of Cu particles and the acidic support.
Article
Chemistry, Physical
Mukesh Kumar Poddar, Ankit Pandey, Mukund Kumar Jha, Suresh Chandra Andola, Syed Saif Ali, Sonu Bhandari, Govind Kumar Sahani, Rajaram Bal
Summary: This study investigated the effect of Cu and Ni on the hydrogenolysis of glycerol to produce 1, 2-Propanediol, finding that Cu nanoparticles are critical for the selective production of the desired product. The mesoporous alumina support played a crucial role in enhancing the performance of Cu and Ni oxide particles, with both acid and metal functions contributing to increasing selectivity for 1, 2-Propanediol.
MOLECULAR CATALYSIS
(2021)
Article
Chemistry, Physical
Chuanshen Wang, Tongming Su, Zuzeng Qin, Hongbing Ji
Summary: In this study, Ni-In/γ-Al2O3 catalysts were prepared and used for the dry reforming of methane, and it was found that the catalyst with a Ni/In ratio of 3/2 exhibited the optimal conversion activity and stability. The addition of In increased the oxygen species and oxygen vacancy amounts on the catalyst, enhancing the CO2 conversion rate and reducing carbon deposition by promoting Ni particle dispersion and inhibiting agglomeration.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Mohammad Kashif, Sadhasivam Thangarasu, Tae Hwan Oh, Prakash Biswas, Dohyung Kang
Summary: This study developed copper and nickel monometallic and bimetallic catalysts supported over activated carbon through the hydrogenolysis of vapor-phase glycerol, resulting in the production of stable 1,2-propanediol. Bimetallic catalysts exhibited higher product yields, with Cu-Ni(1:1)/AC showing the highest yield and conversion rate. The synergistic effect of copper and nickel, smaller crystallite size, and high acid strength of Cu-Ni(1:1)/AC contributed to its superior performance.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
