Functional Oxides for Heterogeneous Catalysis

A special issue of ChemEngineering (ISSN 2305-7084).

Deadline for manuscript submissions: closed (30 April 2021) | Viewed by 6887

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Guest Editor
Department of Chemical Engineering, Auburn University, Auburn, AL 36849, United States
Interests: Oxide catalysts; Fuel cells; Supercapacitors; CO2 capture and utilization; Membrane reactors; Solid-state ionic conductors; Filtration membranes; Solar-thermal synthesis/fabrication; Gas sensors

Special Issue Information

Dear Colleagues,

Heterogeneous catalysis is the engine of chemical industry. Without heterogeneous catalysis that enabled mass production of chemicals, the current society as we know now would have never been possible. There are many pressing problems for environmental protection and sustainable energy consumption. These can only be fundamentally solved by better heterogeneous catalyst design that can provide activity and stability at the same time.

Functional oxides can show emergent properties for heterogeneous catalysis alone or in tandem with dispersed metal. The existence of oxygen vacancies and other extended defects, along with new Operando characterization techniques, enriches the field of oxide catalyst more than ever. For this Special Issue on “Functional Oxides for Heterogeneous Catalysis”, researchers can report findings on oxide catalyst from experimental or theoretical approaches. Given your reputed experience in this field, and the outstanding impact of your previous publications, we would very much appreciate your contribution in this Special Issue of ChemEngineering.

Prof. Tae-Sik Oh
Guest Editor

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Keywords

  • Catalysis
  • Oxides
  • Surfaces
  • Defects
  • Strong metal-support interaction
  • Characterization
  • Electronic structure

Published Papers (2 papers)

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Research

13 pages, 2974 KiB  
Article
Improved Catalytic Activity of the High-Temperature Water Gas Shift Reaction on Metal-Exsolved La0.9Ni0.05Fe0.95O3 by Controlling Reduction Time
by Rui Huang and Jeong Woo Han
ChemEngineering 2021, 5(2), 28; https://doi.org/10.3390/chemengineering5020028 - 7 Jun 2021
Cited by 5 | Viewed by 3743
Abstract
The catalyst exsolved from nickel-doped perovskite oxide, La0.9Ni0.05Fe0.95O3, has been proven to be effective for gas-phase reactions. To obtain the optimum amount of exsolved nanoparticles from the parent perovskite oxide, control of the reduction treatment [...] Read more.
The catalyst exsolved from nickel-doped perovskite oxide, La0.9Ni0.05Fe0.95O3, has been proven to be effective for gas-phase reactions. To obtain the optimum amount of exsolved nanoparticles from the parent perovskite oxide, control of the reduction treatment condition is vital. Here, the effect of reduction time on the exsolved nanoparticle distribution, and thus the catalytic activity of the high-temperature water gas shift reaction (WGSR), was investigated. Upon conducting a wide range of characterizations, we assumed that the exsolution process might be a two-step process. Firstly, the surface oxygen is extracted. Secondly, due to the unstable perovskite structure, the Ni ions in the bulk La0.9Ni0.05Fe0.95O3 continuously diffuse toward the surface and, as the reduction progresses, more nuclei are generated to form a greater number of nanoparticles. This assumption is proven by the fact that, with an increase in the exsolution treatment time, the population of exsolution nanoparticles increases. Moreover, as the reduction time increases, the high-temperature WGSR activity also increases. The temperature-programmed measurements suggest that the exsolved nanoparticles are the active reaction sites. We believe that this study is helpful for understanding exsolution behavior during reduction treatment and, thus, developing a perovskite exsolution catalyst for the WGSR. Full article
(This article belongs to the Special Issue Functional Oxides for Heterogeneous Catalysis)
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11 pages, 2085 KiB  
Article
Alkali-Added Catalysts Based on LaAlO3 Perovskite for the Oxidative Coupling of Methane
by Suna An, JeongHyun Cho, Dahye Kwon and Ji Chul Jung
ChemEngineering 2021, 5(1), 14; https://doi.org/10.3390/chemengineering5010014 - 6 Mar 2021
Cited by 7 | Viewed by 2610
Abstract
In this study, we aimed to enhance the catalytic activity of perovskite catalysts and elucidate their catalytic behavior in the oxidative coupling of methane (OCM), using alkali-added LaAlO3 perovskite catalysts. We prepared LaAlO3_XY (X = Li, Na, K, Y = [...] Read more.
In this study, we aimed to enhance the catalytic activity of perovskite catalysts and elucidate their catalytic behavior in the oxidative coupling of methane (OCM), using alkali-added LaAlO3 perovskite catalysts. We prepared LaAlO3_XY (X = Li, Na, K, Y = mol %) catalysts and applied them to the OCM reaction. The results showed that the alkali-added catalysts’ activities were promoted compared to the LaAlO3 catalyst. In this reaction, ethane was first synthesized through the dimerization of methyl radicals, which were produced from the reaction of methane and oxygen vacancy in the perovskite catalysts. The high ethylene selectivity of the alkali-added catalysts originated from their abundance of electrophilic lattice oxygen species, facilitating the selective formation of C2 hydrocarbons from ethane. The high COx (carbon monoxide and carbon dioxide) selectivity of the LaAlO3 catalyst originated from its abundance of nucleophilic lattice oxygen species, favoring the selective production of COx from ethane. We concluded that electrophilic lattice oxygen species play a significant role in producing ethylene. We obtained that alkali-adding could be an effective method for improving the catalytic activity of perovskite catalysts in the OCM reaction. Full article
(This article belongs to the Special Issue Functional Oxides for Heterogeneous Catalysis)
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