Article
Chemistry, Applied
Aritomo Yamaguchi, Yuka Murakami, Kiyoyuki Yamazaki, Masayuki Shirai, Norihito Hiyoshi
Summary: This study investigated the conditions for the stereoselective hydrogenation of guaiacol and found that using the Rh/C catalyst in supercritical CO2 resulted in a higher proportion of cis-2-methoxycyclohexanol.
Review
Chemistry, Inorganic & Nuclear
Anandhu Mohan, Augustine Jaison, Young-Chul Lee
Summary: The regulation of a large amount of CO2 in the environment is crucial to prevent environmental catastrophes, and this can be achieved through efficient carbon capture and conversion into useful chemicals. Mesoporous silica nanoparticles (MSNs) are ideal support materials for heterogeneous catalysis due to their unique characteristics. This review discusses the functionalization of MSNs, the synthesis of MSN-based catalysts, and their potential applications in CO2 fixation reactions. It highlights the design of an ideal CO2 fixation catalyst, the addition of various functionalities to MSNs, and the effects of controlling particle size distribution, active species dispersion, and interactions between active species and supports. Furthermore, this review provides an overview of the key issues, current developments, and barriers in the field of MSN-based catalysts for CO2 fixation, along with proposed research goals and viable solutions for their implementation.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Applied
Byeongju Song, Jeongmyeong Kim, Iljun Chung, Yongju Yun
Summary: The catalytic properties of Pt catalysts supported on mesoporous silica were studied in the enantio-selective hydrogenation of ethyl pyruvate. The results showed that the pore structure and size of the m-SiO2 supports significantly influenced both the activity and enantioselectivity. The use of specific modifiers and H-2 pressure further improved the performance of the catalysts.
Article
Chemistry, Multidisciplinary
Qizhuang Zou, Junji Chen, Yizhou Wang, Jiarui Gu, Fei Liu, Tianxiang Zhao
Summary: The bimetallic mesoporous catalyst Pd0.25Cu0.75/Al2O3 prepared via mechanochemistry showed excellent catalytic activity and selectivity for N-formylation of various aliphatic amines. Despite having the lowest Pd loading, it achieved an unprecedented turnover number of up to 527, suggesting its potential for green and economical synthesis of heterogeneous metal catalysts.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Physical
Shohei Tada, Hiroka Kinoshita, Nagomu Ochiai, Anand Chokkalingam, Peidong Hu, Noriko Yamauchi, Yoshio Kobayashi, Kenta Iyoki
Summary: The development of methodologies for CO2 utilization is in high demand globally. Tandem catalysts of ZnZrOx and solid acid catalysts were proposed for one-pass synthesis of lower olefins. The pore sizes and channel dimensionality of zeolites influenced the selectivity of products, with zeolites with small pores showing potential for producing light olefins.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Environmental
Xilong Wang, Mohnnad H. Alabsi, Xingzhu Chen, Aijun Duan, Chunming Xu, Kuo-Wei Huang
Summary: PdZn/CTD catalysts with CeTi bimetallic modified dendritic mesoporous silica nanospheres as supports exhibit excellent catalytic performance for CO2 hydrogenation to methanol. The optimized catalysts demonstrate high methanol yield, selectivity, and stability, and the reaction mechanism is found to involve HCOO* and CH3O* intermediates.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Applied
Nora Jannsen, Cornelia Pribbenow, Carmen Selle, Hans-Joachim Drexler, Marc-Andre Mueller, Jonathan A. Medlock, Werner Bonrath, Detlef Heller
Summary: An efficient and highly selective semi-hydrogenation of terminal alkynes to alkenes has been achieved using neutral dimeric rhodium(I) complexes. The results show excellent selectivity and no deactivation or reduction in selectivity, indicating the potential industrial application of homogeneous rhodium complexes in the semi-hydrogenation of terminal alkynes.
ADVANCED SYNTHESIS & CATALYSIS
(2023)
Article
Chemistry, Applied
Pedro Nothaft Romano, Jose Faustino Souza de Carvalho Filho, Joao Monnerat Araujo Ribeiro de Almeida, Eduardo Falabella Sousa-Aguiar
Summary: A series of mono and bimetallic catalysts based on Ni, Rh, and Pd supported on different materials were evaluated for the dry reforming of methane reaction. Ni-based catalysts suffered from deactivation but could be regenerated, while Pd-based catalysts deactivated due to coke deposition. Rh-based catalysts showed remarkable activity and stability.
Article
Chemistry, Multidisciplinary
Anna Carrasco Garcia, Javier Moral-Vico, Ahmad Abo Markeb, Antoni Sanchez
Summary: Nowadays, there is a growing awareness of the environmental impact caused by carbon dioxide emissions. One possible solution is the hydrogenation of carbon dioxide into methanol using nanomaterials as catalysts. This study evaluates the performance of copper, zinc, and zinc oxide nanoparticles in supported and unsupported bimetallic systems to compare their efficiency. The results suggest that using bimetallic systems combined with porous supports improves the performance of unsupported materials.
Review
Chemistry, Multidisciplinary
Ruiyan Sun, Yuhe Liao, Shao-Tao Bai, Mingyuan Zheng, Cheng Zhou, Tao Zhang, Bert F. Sels
Summary: This review comprehensively summarizes the latest advancements in heterogeneous catalysis of CO2 hydrogenation to formic acid/formate, highlighting nanostructured and single atom catalysts based on noble metals. Key factors related to catalytic activity are emphasized, providing a strong foundation for rational catalyst design.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Chemistry, Inorganic & Nuclear
Israel T. Pulido-Diaz, Alejandro Serrano-Maldonado, Carlos Cesar Lopez-Suarez, Pedro A. Mendez-Ocampo, Benjamin Portales-Martinez, Aida Gutierrez-Alejandre, Karla P. Salas-Martin, Itzel Guerrero-Rios
Summary: The study demonstrates that nicotinamide groups grafted on ordered mesoporous silica (OMS) can serve as stabilizers for RhNPs used as catalysts, forming spherical rhodium nanoparticles with a narrow size distribution. On the contrary, amine-functionalized OMS tends to form RhNP aggregates after catalytic reactions, affecting the reaction efficiency. Supported RhNPs also exhibit selective reduction of different groups and show high activity in reductive amination reactions.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Applied
Elena Spennati, Gabriella Garbarino, Letizia Savio, Luca Vattuone, Paola Riani, Guido Busca
Summary: Catalysts with different cobalt loadings and supports were prepared and characterized. The catalytic activities for CO2 hydrogenation were evaluated, and the results showed that the catalyst with 5 wt% Co on pure gamma-Al2O3 mainly exhibited reverse Water Gas Shift (rWGS) activity, while the catalyst with 13.6 wt% Co on pure gamma-Al2O3 showed methanation activity. The addition of silica decreased the selectivity to CO but enhanced the methanation activity. The 13.6 wt% Co/gamma-Al2O3 catalyst had lower selectivity but higher stability compared to Ni/gamma-Al2O3 catalysts and unsupported cobalt and Co/SiO2 catalysts. The effect of silica on the catalysts was a combination of increasing the total surface area and decreasing the available surface area for cobalt dispersion.
Article
Multidisciplinary Sciences
Zakaria Refaat, Mohamed El Saied, Ahmed O. Abo El Naga, Seham A. Shaban, H. B. Hassan, Mohamed Refaat Shehata, F. Y. El Kady
Summary: The CO2 methanation technique is a solution for reducing CO2 emissions and can also be utilized for energy storage and transmission. The mesoporous carbon nitride (MCN) with its basic character and large surface area is considered as a promising catalyst for CO2 methanation. Ni-doped MCN catalysts with varying Ni content (5-20 wt.%) were prepared using the impregnation method. The catalysts were characterized using multiple physicochemical techniques, and their catalytic performance was evaluated using online gas chromatography. The 15%Ni/MCN catalyst showed the best performance with 100% methane selectivity at 450°C under the investigated conditions.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Multidisciplinary
Yanru Zhang, Ying Wang, Qingli Qian, Yang Li, Bernard Baffour Asare Bediako, Jingjing Zhang, Junjuan Yang, Zhiyan Li, Buxing Han
Summary: This paper presents a method for synthesizing higher carboxylic acids from CO2 and H2 through the reaction of alcohols. The reaction is effectively accelerated by a catalytic system consisting of iridium(iii) acetate and LiI. The method is applicable to various alcohols and the reaction mechanism is proposed based on systematic control experiments.
Article
Chemistry, Multidisciplinary
Xin-Yu Meng, Chong Peng, Jinping Jia, Peng Liu, Yu-Long Men, Yun-Xiang Pan
Summary: This review highlights the recent progress on In2O3-based composite catalysts for promoting CO2 hydrogenation, discussing strategies for enhancing their performance, analyzing the hydrogenation mechanisms of CO2 on In2O3-based composite catalysts, and presenting future research opportunities and challenges.
JOURNAL OF CO2 UTILIZATION
(2022)
Article
Engineering, Chemical
Andrea Coletto, Pietro Poesio
Summary: Experiments and simulations were conducted to study the air volume fraction and hold-up in a bubble channel reactor. A new signal processing method was proposed to avoid the loss of bubble residence time. The results were in agreement with previous studies and a bubble-scale model was developed to explain the relationship between hold-up and air superficial velocity.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2024)
