Article
Chemistry, Multidisciplinary
Yang Jiang, Qian Li, Xi Li, Xinyi Wang, Sen Dong, Jianhua Li, Li Hou, Tifeng Jiao, Yatao Wang, Faming Gao
Summary: This study successfully prepared three-dimensional network Pd-Ni bimetallic catalysts, which exhibited high conversion rate and selectivity for the hydrogenation of nitrobenzene at low temperature and normal pressure. The catalysts showed significant catalytic efficiency and recyclability even after 10 cycles, providing important theoretical basis and technical support for the preparation of low-cost, highly efficient catalysts.
Article
Chemistry, Physical
Tomas Weidlich
Summary: This review summarizes recent applications of nickel as a nonprecious metal catalyst in hydrodehalogenation reactions of halogenated aromatic compounds. Nickel-based HDH catalysts were developed for reductive treatment of waste and wastewater contaminated with Ar-Xs, enabling the production of nonhalogenated aromatic products that are more applicable/recyclable or biodegradable. Developed HDH methods allow the utilization of gaseous hydrogen or other chemical reductants as a source of hydrogen in the hydrodehalogenation process.
Review
Engineering, Environmental
Ali K. Ilunga, Bhekie B. Mamba, Thabo T. Nkambule
Summary: Water treatment plants use chlorine to eliminate microorganisms and prevent microbial contamination, but the formation of chlorinated disinfection byproducts poses severe health risks. Traditional water treatment methods can remove most chlorinated byproducts precursors, but may fail to completely eliminate chlorinated DBPs in drinking water at low concentrations. Catalytic hydrodehalogenation is proposed as an efficient approach to completely eradicate chlorinated DBPs in water treatment.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Engineering, Environmental
Jie Gao, Yang Cao, Gang Luo, Jiajun Fan, James H. Clark, Shicheng Zhang
Summary: In this study, a series of Ni loaded metal phosphates catalysts were prepared for the hydrodeoxygenation of lignin-derived vanillin. It was found that Ni/ZrP catalyst showed the highest activity due to its small Ni particle size, large specific surface area, strong metal-support interaction, and optimal acidity. The synergistic effect of Ni, Lewis acid sites (LAS), and Bronsted acid sites (BAS) was proven to be important for the conversion of vanillin. Hydrogen from both H2 and isopropanol contributed to the reaction, reducing the need for external H2 supply.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Beatriz Garcia, Ana Orozco-Saumell, Manuel Lopez Granados, Jovita Moreno, Jose Iglesias
Summary: The catalytic transfer hydrogenation of glucose to sorbitol using biomass-derived alcohols and diols as hydrogen donors was studied. Sacrificial diols showed superior performance compared to short-chain alcohols, with terminal diols providing high selectivity in the conversion. Molybdenum promotion enhanced catalytic activity of sponge nickel catalysts, allowing high selectivity in continuous-flow operation for at least 550 hours.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Ruth D. Mojica Sepulveda, Luis J. Mendoza Herrera, Delia B. Soria, Virginia Vetere, Eduardo E. Grumel, Carmen I. Cabello, Marcelo Trivi, Myrian C. Tebaldi
Summary: We investigated the influence of various physical-chemical parameters on the selective reaction of acetophenone hydrogenation using different nickel catalysts on clinoptilolite supports. The aim of this study is to identify the combination of parameters that allows for obtaining the best catalytic results.
Article
Chemistry, Physical
Magdi El Fergani, Natalia Candu, Iunia Podolean, Bogdan Cojocaru, Adela Nicolaev, Cristian M. Teodorescu, Madalina Tudorache, Vasile Parvulescu, Simona M. Coman
Summary: This study investigated the catalytic hydrotreatment of humins, a solid byproduct from the conversion of C6 sugars to HMF, using different supported Pd@zeolite catalysts. The reaction parameters and product compositions were studied.
Article
Agricultural Engineering
Guojun Hao, Hongying Liu, Zhibing Chang, Kechen Song, Xin Yang, Han Ma, Wenjing Wang
Summary: This study investigated the depolymerization of lignin using CoMo sulfide catalysts supported on different carriers in a supercritical ethanol system. The effects of temperature, time, MoS2, and carrier on the lignin depolymerization were examined. The Co-Mo-S/ZrO2 catalyst showed a liquefaction yield of 95.76% with minimal char formation at 340 degrees C for 150 minutes. The liquid product mainly consisted of C-4-C-8 alcohols, C-4-C-10 esters, and C-7-C-10 aromatic compounds. The synergistic effect of active and acid-base sites on the support played a crucial role in the lignin depolymerization process.
BIOMASS & BIOENERGY
(2022)
Review
Chemistry, Multidisciplinary
Sungmin Han, C. Buddie Mullins
Summary: The study of Pd-Au model catalysts under UHV conditions reveals the influence of Pd ensemble size on H-2 desorption behavior, allowing H-2 to be used as a probe molecule for quantifying surface composition. Additionally, the Pd-Au interface is identified as the main reaction site for generating H-2, providing insights for potential liquid storage mediums for hydrogen.
ACCOUNTS OF CHEMICAL RESEARCH
(2021)
Article
Energy & Fuels
Han-Bing Gao, Le-Le Qiu, Fa-Peng Wu, Jian Xiao, Yun-Peng Zhao, Jing Liang, Yong-Hui Bai, Fang-Jing Liu, Jing-Pei Cao
Summary: C-O bonds in lignin can be efficiently cleaved by a hydrotalcite-derived Ni-based catalyst, leading to the production of high value-added bio-fuels and chemicals. The optimized Ni/Al2O3-500 catalyst exhibits excellent catalytic activity and stability, with complete conversion of diphenyl ether to monomeric products under optimized conditions. This catalyst shows promising potential in the hydrogenolysis of lignin derivatives.
Article
Chemistry, Physical
Barbora Kamenicka, Tomas Weidlich
Summary: This article aimed to compare the degradation efficiencies of different reactants applicable for the oxidative or reductive degradation of a chlorinated anionic azo dye, Mordant Blue 9 (MB9). The efficiencies of both the oxidative and reductive degradation processes were monitored and compared. A combination of reduction methods offers a smooth, simple, and efficient degradation and hydrodehalogenation of chlorinated textile MB9 dye.
Article
Energy & Fuels
Jae-Wang Shim, Sumin Pyo, Su Shiung Lam, Jungho Jae, Byong-Hun Jeon, Moonis Ali Khan, Kun-Yi Andrew Lin, Young-Min Kim, Sang-Chul Jung, Young-Kwon Park
Summary: This study investigated the pyrolysis kinetics and product distribution of chicken manure through thermogravimetric analysis and pyrolyzer-gas chromatography/mass spectrometry. The results showed different decomposition reactions at different stages and the catalytic effect of acid catalysts on product formation.
Article
Engineering, Environmental
Lei Zuo, Junfeng Wang, Deqing Mei, Derick Adu-Mensah, Yaping Gao
Summary: The study investigated the ultrasonic-assisted CTH process for biodiesel, which effectively controlled the generation of C18:0 and trans-C18:1. The optimum reaction conditions were found to be reaction temperature of 80°C, stirring rate of 600 rpm, catalyst dosage of 10 wt%, isopropanol amount of 32 g, and water amount of 100 g. The ultrasonic field reduced the selectivity of trans-C18:1 and decreased the iodine value of biodiesel.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Ryan M. Claydon, Luis A. Roman-Ramirez, Joseph Wood
Summary: The study shows that the Mo-MMO catalyst exhibits comparable reaction rates to Pd-2%/Al2O3 catalyst and significant advantage in cis-decalin production, offering the opportunity for generating more alkyl naphthenes in subsequent hydrodecyclization reactions. On the other hand, Pd catalysts supported on Al2O3 tend to preferentially produce trans-decalin due to the electronic properties of Pd catalysts influencing octalin intermediate orientations on the catalyst surface.
Article
Chemistry, Applied
Wang Yin, Hanwen Gu, Monique Bernardes Figueiredo, Shuqian Xia, Robertus Hendrikus Venderbosch, Hero Jan Heeres
Summary: The study focused on catalytic hydrotreatment of fast pyrolysis liquids from lignocellulosic biomass using different types of Raney nickel catalysts, with Mo-promoted Ra-Ni catalyst showing the highest hydro-(deoxy)genation activity and lowest charring tendency of the product oil. The analyses of product oils revealed the presence of a significant amount of phenolics, indicating the potential of commercially available Raney nickel catalysts, particularly the Mo-promoted ones, for mild hydrotreatment of pyrolysis liquids.
FUEL PROCESSING TECHNOLOGY
(2021)
