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Molecules
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New Strategies for Metal Catalysis in Heterogeneous System
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New Strategies for Metal Catalysis in Heterogeneous System

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Inorganic Chemistry".

Deadline for manuscript submissions: closed (31 July 2024) | Viewed by 2428

Special Issue Editor

Dr. Meng Zhang

E-Mail Website
Guest Editor
College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
Interests: Carbon Capture, Utilization, and Storage (CCUS); methane reforming; methanation; heterogeneous catalysis; catalytic hydrogenation; thermodynamics; kinetics

Special Issue Information

Dear Colleagues,

Active metal is a key component of the heterogeneous catalyst. The particle size and chemical state of the active sites play the remarkable role in reaction performance, including conversion, selectivity and stability. Recently, a series of strategies have been developed to regulate the metal catalysts, and a series of the novel catalysts have been emerged, such as single atom, cluster and nanoparticle catalysts. Simultaneously, it is crucial to discuss the metal-support interaction and support effects on active metal size distribution and chemical state. Additionally, in-situ characterization techniques are needed to unravel the influences of the catalyst structure and surface properties on reaction performance, as well as the reaction mechanism. This Special Issue will highlight the deep insights into the new strategies to design the efficient and robust metal catalysts in heterogeneous system and the topics on the advanced techniques to decipher the structure-activity relationship are also included.

Dr. Meng Zhang
Guest Editor

Manuscript Submission Information

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Keywords

  • single atom catalyst
  • metal-support interaction
  • preparation method
  • in-situ characterization technique
  • support effect
  • reaction mechanism
  • structure-activity relationship

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Published Papers (2 papers)

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Research

15 pages, 6547 KiB  
Article
Effect of Calcination Atmosphere on the Performance of Cu/Al2O3 Catalyst for the Selective Hydrogenation of Furfural to Furfuryl Alcohol
by Yongzhen Gao, Wenjing Yi, Jingyi Yang, Kai Jiang, Tao Yang, Zhihan Li, Meng Zhang, Zhongyi Liu and Benlai Wu
Molecules 2024, 29(12), 2753; https://doi.org/10.3390/molecules29122753 - 9 Jun 2024
Viewed by 1212
Abstract
The selective hydrogenation of the biomass platform molecule furfural (FAL) to produce furfuryl alcohol (FA) is of great significance to alleviate the energy crisis. Cu-based catalysts are the most commonly used catalysts, and their catalytic performance can be optimized by changing the preparation [...] Read more.
The selective hydrogenation of the biomass platform molecule furfural (FAL) to produce furfuryl alcohol (FA) is of great significance to alleviate the energy crisis. Cu-based catalysts are the most commonly used catalysts, and their catalytic performance can be optimized by changing the preparation method. This paper emphasized the effect of calcination atmosphere on the performance of a Cu/Al2O3 catalyst for the selective hydrogenation of FAL. The precursor of the Cu/Al2O3 catalyst prepared by the ammonia evaporation method was treated with different calcination atmospheres (N2 and air). On the basis of the combined results from the characterizations using in situ XRD, TEM, N2O titration, H2-TPR and XPS, the Cu/Al2O3 catalyst calcined in the N2 atmosphere was more favorable for the dispersion and reduction of Cu species and the reduction process could produce more Cu+ and Cu0 species, which facilitated the selective hydrogenation of FAL to FA. The experimental results showed that the N2 calcination atmosphere improved the FAL conversion and FA selectivity, and the FAL conversion was further increased after reduction. Cu/Al2O3-N2-R exhibited the outstanding performance, with a high yield of 99.9% of FA after 2 h at 120 °C and an H2 pressure of 1 MPa. This work provides a simple, efficient and economic method to improve the C=O hydrogenation performance of Cu-based catalysts. Full article
(This article belongs to the Special Issue New Strategies for Metal Catalysis in Heterogeneous System)
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20 pages, 6236 KiB  
Article
Dry Reforming of Methane over Pyrochlore-Type La2Ce2O7-Supported Ni Catalyst: Effect of Particle Size of Support
by Zeling Zhou, Chao Li, Junfeng Zhang, Qiliang Gao, Jiahao Wang, Qingde Zhang and Yizhuo Han
Molecules 2024, 29(8), 1871; https://doi.org/10.3390/molecules29081871 - 19 Apr 2024
Viewed by 817
Abstract
The properties of supports (such as oxygen vacancies, oxygen species properties, etc.) significantly impact the anti-carbon ability due to their promotional effect on the activation of CO2 in dry reforming of methane (DRM). Herein, pyrochlore-type La2Ce2O7 compounds [...] Read more.
The properties of supports (such as oxygen vacancies, oxygen species properties, etc.) significantly impact the anti-carbon ability due to their promotional effect on the activation of CO2 in dry reforming of methane (DRM). Herein, pyrochlore-type La2Ce2O7 compounds prepared using co-precipitation (CP), glycine nitrate combustion (GNC) and sol–gel (S-G) methods, which have highly thermal stability and unique oxygen mobility, are applied as supports to prepare Ni-based catalysts for DRM. The effect of the calcining temperature (500, 600 and 700 °C) on La2Ce2O7(CP) has also been investigated. Based on multi-technique characterizations, it is found that the synthesis method and calcination temperature can influence the particle size of the La2Ce2O7 support. Changes in particle size strongly modulate the pore volume, specific surface area and numbers of surface oxygen vacancies of the La2Ce2O7 support. As a result, the distribution of supported Ni components is affected due to the different metal–support interaction, thereby altering the activity of the catalysts for cracking CH4. Moreover, the supports’ abilities to adsorb and activate CO2 are also adjusted accordingly, accelerating the removal of the carbon deposited on the catalysts. Finally, La2Ce2O7(CP 600) with an appropriate particle size exhibits the best catalytic activity and stability in DRM. Full article
(This article belongs to the Special Issue New Strategies for Metal Catalysis in Heterogeneous System)
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