Article
Chemistry, Physical
Valeriia Korolova, Oleg Kikhtyanin, Francisco Ruiz-Zepeda, Miloslav Lhotka, Martin Vesely, David Kubicka
Summary: This study investigated the properties and catalytic performance of MgAl hydrotalcites under repetitive calcination-rehydration treatments, revealing the importance of complete rehydration and efficient reincorporation of Al species for maximizing catalytic activity.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Inorganic & Nuclear
Fernando Jose Soares Barros, Yue Liu, Clarissa Dantas Paula, Francisco Murilo Tavares de Luna, Enrique Rodriguez-Castellon, Rodrigo Silveira Vieira
Summary: This study assessed the impact of rehydration on the catalytic properties of Mg/Al layered double hydroxides (LDH) for glycerol oligomerization. A LDH modification strategy was developed with the addition of acetic acid, which improved the selectivity to diglycerol. Recycling of the modified LDH showed better performance compared to the non acid treated material. Loss of metallic species by leaching to the reaction products was not observed, an advantage over previous works.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Physical
Jan Horacek, Zdenek Tisler, Uliana Akhmetzyanova, Paula G. Chirila, Hector de Paz Carmona
Summary: The scale-up procedure of acetone-furfural aldol condensation was studied on Mg-Al mixed oxide, and the catalyst's stability was evaluated. Catalyst deactivation was found to be related to the amount of treated feedstock, and it could be compensated by adjusting the reaction temperature or feeding rate. The reaction mechanism involves furfural reacting first with acetone to form a crucial compound for heavier compounds formation.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Weijie Zhu, Fen Yao, Qiongfei Wu, Qiu Jiang, Jinxian Wang, Zhoucheng Wang, Hanfeng Liang
Summary: Researchers have developed a Ru/beta-Co(OH)(2) heterostructure catalyst that shows high activity, selectivity, and stability in electrocatalytic nitrate reduction reaction. The catalyst efficiently converts nitrate pollutants into valuable ammonia products.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Edyta Monasterska, Agnieszka Siewniak, Ewa Pankalla, Anna Chrobok
Summary: This review provides a comprehensive overview of synthesis methods and applications of hydroxypivaldehyde, with 37 references included.
PRZEMYSL CHEMICZNY
(2021)
Article
Biochemistry & Molecular Biology
Yan Xiao, Nannan Zhan, Jie Li, Yuan Tan, Yunjie Ding
Summary: The catalytic upgrading of ethanol into butanol through the Guerbet coupling reaction has been widely studied due to the abundance of bioethanol and the versatility of butanol applications. Four different supported Cu catalysts were used to investigate the catalytic performances for ethanol conversion. It was found that Ni-containing catalysts showed better reactivity, Al-containing catalysts exhibited better stability, and Ni-Al catalytic systems had a synergistic effect on ethanol conversion, butanol selectivity, and catalyst stability. Various characterizations were applied to analyze the properties of different catalysts, and it was found that Cu species provided active sites for ethanol dehydrogenation/hydrogenation, while the support derived from Ni-Al-LDH supplied appropriate acid-base sites for aldol condensation, resulting in high butanol selectivity. Moreover, catalysts with strong reducibility, such as Cu/NiO, were easily deactivated during the Guerbet coupling process.
Article
Chemistry, Physical
Zhichao Jia, Na Ji, Xinyong Diao, Xinxin Li, Yujun Zhao, Xuebin Lu, Qingling Liu, Caixia Liu, Guanyi Chen, Longlong Ma, Shurong Wang, Chunfeng Song, Changzhi Li
Summary: A strategy for low-temperature synthesis of nickel phosphide catalysts with flower-like porous structures is proposed. These catalysts exhibit high activity and selectivity in the hydrodeoxygenation reaction, converting lignin-derived compounds into alkanes.
Article
Chemistry, Multidisciplinary
Min Sheng, Sho Yamaguchi, Ayako Nakata, Seiji Yamazoe, Kiyotaka Nakajima, Jun Yamasaki, Tomoo Mizugaki, Takato Mitsudome
Summary: An air-stable, active, and reusable non-noble-metal-based heterogeneous catalyst, hydrotalcite-supported cobalt phosphide nanorods (Co2P NR/HT), has been developed for the selective hydrogenation of nitriles to primary amines. The catalyst shows broad substrate generality and high activity under mild conditions, enabling nitrile hydrogenation with high yields without the need for ammonia.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Physical
Yuanyuan Jiang, Haolan Liu, Huaiyuan Zhao, Ruru Zhou, Weichen Du, Songlin Wang, Zhaoyin Hou
Summary: This study achieved the catalytic synthesis of stable and efficient 3-hydroxybutyraldehyde from surplus acetaldehyde by preparing solid base catalysts with specific structures. Under specific conditions, the selectivity of 3-HBA reached 89.0%, with a conversion rate of 73.8% for acetaldehyde, and the catalyst could maintain its activity for up to 300 hours.
APPLIED CLAY SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Mina Zare, Leila Moradi
Summary: In this study, magnetic mesoporous N-doped silica nanospheres decorated by CuO nanoparticles (M-MNS/CuO) were prepared and used for the green and efficient synthesis of [3.3.3] propellane indeno[1,2-b] indole derivatives. The catalyst has dual acidic and basic properties due to the presence of nitrogen atoms and copper oxide nanoparticles in its structure.
Article
Environmental Sciences
Jin Wang, Jihui Zhang, Yahui Song, Xianmang Xu, Mengyun Cai, Peichuang Li, Wenpeng Yuan, Yujiao Xiahou
Summary: In this research, a highly recyclable catalyst of Ag-based agarose hydrogel was successfully fabricated through a simple reduction method. The hydroxyl functional groups in agarose effectively control the growth and dispersion of Ag nanoparticles in the hydrogel, ensuring the reusability of the catalyst. The hydrogel showed great potential as a catalyst for reducing aromatic organic pollutants, achieving high conversion rates and efficient reduction of various pollutants.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Da-Wu Li, Xing-Fu Zhang, Xiao-Tong Zhang, Xiao-Sen Lv, Nan You
Summary: We report on the optical performances of a newly developed nanocomposite based on N-doped carbon dots with Zn-assisted modification (Zn/N-CDs) using hydrotalcite as the support (Zn/N-CDs@hydrotalcite) for the enhanced solid-state fluorescence in its application of the visualization of latent fingerprints (LFPs). The as-prepared Zn/N-CDs@hydrotalcite can interact with universal components of the LFPs residues through electrostatic interactions and physical adsorption. Good dispersion of the Zn/N-CDs on the surface of hydrotalcite overcomes aggregation-induced quenching effect, and emits the bright green fluorescence of 525 nm under the excitation of 365 nm ultraviolet light in solid states, providing a well-defined platform for the visualization of LFPs.
Article
Engineering, Chemical
Chalachew Mebrahtu, Florian Krebs, Gianfranco Giorgianni, Salvatore Abate, Siglinda Perathoner, Gabriele Centi, Alexander I. Large, Georg Held, Rosa Arrigo, Regina Palkovits
Summary: Designing CO2 methanation catalysts that meet industrial requirements is still challenging. We report Ni-Fe hydrotalcite-derived catalysts with a wide range of Ni and Mg loadings showing that an optimised composition with Ni0.4 gives a very high CO2 conversion rate of 0.37 mmol/gcat/s at 300 degrees C. This catalyst is studied by in-situ APXPS and NEXAFS spectro- scopies and compared with the other synthesised samples to obtain new mechanistic in- sights on methanation catalysts active for low-temperature (300 degrees C) methanation, which is an industrial requirement. Under methanation conditions, in-situ investigations revealed the presence of metallic Ni sites and low nuclearity Ni-Fe species at xN; L (Ni loading)=21.2 mol%. These sites are oxidised on the low Ni-loaded catalyst(xN;L=9.2 mol%). The best CO2 conversion rate and CH4 selectivity are shown at intermediate xN;L (21.2 mol%), in the presence of Mg. These superior performances are related to the high metallic surface area, dispersion, and optimal density of basic sites. The TOFCO2(turnover frequency of CO2 con- version) increases exponentially with the fractional density of basic to metallic sites (XB) from 1.1 s-1(xN;L=29.2 mol%) to 9.1 s-1(xN;L=7.6 mol%). It follows the opposite trend of the CO2 conversion rate. In-situ DRIFTS data under methanation conditions evidence that the TOFCO2at high XB is related to the presence of a formate route which is not predominant at low XB (high xN; L ). A synergistic interplay of basic and metallic sites is present. This con- tribution provides a rationale for designing industrially competitive CO2 methanation cat- alysts with high catalytic activity while maintaining low Ni loading.(c) 2023 Institution of Chemical Engineers. Published by Elsevier Ltd. All rights reserved.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Chemistry, Multidisciplinary
Wenbo Gao, Sheng Feng, Hanxue Yan, Qianru Wang, Hua Xie, Ling Jiang, Weijin Zhang, Yeqin Guan, Han Wu, Hujun Cao, Jianping Guo, Ping Chen
Summary: A novel catalyst has been synthesized in this study, achieving a significantly higher ammonia synthesis rate under mild reaction conditions.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Keita Ikeue, Yuka Miyamoto, Erika Ando
Summary: Metal-substituted KFe11O17 was synthesized as a solid base catalyst for biodiesel fuel production. Among the metal-substituted samples, Mn-substituted KFe11O17 showed the highest catalytic activity for the transesterification reaction and exhibited higher activity than other typical solid base catalysts.
CHEMICAL PHYSICS LETTERS
(2023)
