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Catalysts
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Catalytic Reforming of Methane
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Catalytic Reforming of Methane

A special issue of Catalysts (ISSN 2073-4344).

Deadline for manuscript submissions: closed (31 March 2019) | Viewed by 16220

Special Issue Editors

Dr. Hamidreza Arandiyan

E-Mail Website
Guest Editor
Laboratory of Advanced Catalysis for Sustainability, School of Chemistry, The University of Sydney, Sydney 2006, Australia
Interests: perovskite-type oxides; heterogeneous catalysis; nanomaterial design; rational design of metal oxides; nanocatalysis; mesoporous materials; CO2 reduction
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Mehran Rezaei

E-Mail Website
Guest Editor
Catalyst and Advanced Materials Research Laboratory, Chemical Engineering Department, University of Kashan, Kashan, Iran
Interests: metal-support interactions; nanostructured materials; syngas production; environmental catalysis; hydrogenation, dehydrogenation, H2 production; catalytic oxidation

Special Issue Information

Dear Colleagues,

Natural gas reforming by means of dry reforming has recently achieved great importance as a way of producing syngas. Great attention is being paid to the conversion of CH4 and CO2, the cheapest carbon-containing materials, into more valuable compounds by catalytic reactions. The conversion of CH4 to synthesis gas is usually carried out by steam reforming with a ratio of H2/CO > 3, which is too high to be suitable for Fischer–Tropsch synthesis. The replacement of H2O by CO2 has received considerable attention from an environmental point of view because the emission of CH4 and CO2 into the atmosphere bring about global warming through the greenhouse effect, and these harmful gases can be simultaneously converted into useful synthesis gas. Many efforts have focused on the development of perovskite mixed oxide and metal catalysts which bear high catalytic performances toward synthesis gas formation and are also resistant to carbon deposition, thus displaying stable long-term operation. Noble metal catalysts are less sensitive to carbon deposition; however, base metals, such as Ni, Fe, and Co, are often preferred considering the high cost and limited availability of noble metals.

This particular Special Issue of Catalysts is, therefore, on the following topics:

  • Tackling the issue of catalyst design based on an understanding of its deactivation mechanism;
  • Active catalysts with a small particle size, appropriate metal-support interaction but nonetheless good reducibility, and a certain tolerance to carbon formation;
  • Investigating the prevention of carbon diffusion into active metal crystallites while maintaining acceptable activity;
  • Optimizing of the reaction conditions for the process in a variety of different catalytic material classes, including perovskite mixed oxides, metal-oxide systems, and intermetallic compounds;
  • Combining catalysis and plasma, which can be an alternative to integrate the advantages of catalysis and plasma.

Dr. Hamidreza Arandiyan
Prof. Mehran Rezaei
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Catalysts is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Catalytic processes for synthesis gas production
  • Deactivation
  • Noble metal catalysts
  • Perovskite mixed oxide catalysts
  • Transition metal oxides catalysts
  • Novel synthetic techniques
  • Shape and size effects in catalysis
  • Surface/structure promotion
  • Promoters/Modifiers
  • Advanced characterization studies

Published Papers (3 papers)

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Research

17 pages, 4762 KiB  
Article
Chromium-Ruthenium Oxides Supported on Gamma-Alumina as an Alternative Catalyst for Partial Combustion of Methane
by Tanakit Chomboon, Weerit Kumsung, Metta Chareonpanich, Selim Senkan and Anusorn Seubsai
Catalysts 2019, 9(4), 335; https://doi.org/10.3390/catal9040335 - 04 Apr 2019
Cited by 7 | Viewed by 3169
Abstract
Catalyst screening of γ-Al2O3-supported, single-metal and bimetallic catalysts revealed several bimetallic catalysts with activities for partial combustion of methane greater than a benchmark Pt/γ-Al2O3 catalyst. A cost analysis of those catalysts identified that the (2 wt%Cr [...] Read more.
Catalyst screening of γ-Al2O3-supported, single-metal and bimetallic catalysts revealed several bimetallic catalysts with activities for partial combustion of methane greater than a benchmark Pt/γ-Al2O3 catalyst. A cost analysis of those catalysts identified that the (2 wt%Cr + 3 wt% Ru)/γ-Al2O3 catalyst, denoted as 2Cr3Ru/Al2O3, was about 17.6 times cheaper than the benchmark catalyst and achieved a methane conversion of 10.50% or 1.6 times higher than the benchmark catalyst based on identical catalyst weights. In addition, various catalyst characterization techniques were performed to determine the physicochemical properties of the catalysts, revealing that the particle size of RuO2 became smaller and the binding energy of Ru 3d also shifted toward a lower energy. Moreover, the operating conditions (reactor temperature and O2/CH4 ratio), stability, and reusability of the 2Cr3Ru/Al2O3 catalyst were investigated. The stability test of the catalyst over 24 h was very good, without any signs of coke deposition. The reusability of the catalyst for five cycles (6 h for each cycle) was noticeably excellent. Full article
(This article belongs to the Special Issue Catalytic Reforming of Methane)
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18 pages, 5310 KiB  
Article
CO2 Microwave Plasma—Catalytic Reactor for Efficient Reforming of Methane to Syngas
by Se Min Chun, Dong Hun Shin, Suk Hwal Ma, Geon Woo Yang and Yong Cheol Hong
Catalysts 2019, 9(3), 292; https://doi.org/10.3390/catal9030292 - 22 Mar 2019
Cited by 27 | Viewed by 8337
Abstract
CO2 was converted to synthesis gas in a microwave plasma–catalytic reactor by methane reforming at atmospheric pressure. The hybrid system used waste heat from the plasma to heat the catalyst. Conversion degrees were examined as a function of gas temperature, and the [...] Read more.
CO2 was converted to synthesis gas in a microwave plasma–catalytic reactor by methane reforming at atmospheric pressure. The hybrid system used waste heat from the plasma to heat the catalyst. Conversion degrees were examined as a function of gas temperature, and the reforming efficiency of the plasma-only system was compared with that of the hybrid system. As a result, the hybrid system was shown to be more efficient under catalyst-free conditions. The use of microwave plasma alone resulted in low conversions of CO2 and CH4, which were 32.9% and 42.7%, respectively, at 3 kW microwave power. High CO2 and CH4 conversions of 87.9% and 92.9%, respectively, were achieved in the presence of catalyst at the same microwave power. At constant microwave power, catalyst addition increased the H2 and CO mass yield rates to 0.27 kg/h and 2.012 kg/h, respectively. Additionally, the H2 energy yield were 270 g/h, and 91.2 g/kWh. Thus, the developed hybrid system is well suited for efficient and economically viable CO2 reduction and synthesis gas production, paving the way for next-generation CO2 utilization and zero-emission industrial processes. Full article
(This article belongs to the Special Issue Catalytic Reforming of Methane)
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12 pages, 3557 KiB  
Article
Low Temperature Activation of Carbon Dioxide by Ammonia in Methane Dry Reforming—A Thermodynamic Study
by Anand Kumar
Catalysts 2018, 8(10), 481; https://doi.org/10.3390/catal8100481 - 22 Oct 2018
Cited by 8 | Viewed by 4009
Abstract
Methane dry reforming (MDR) is an attractive alternative to methane steam reforming for hydrogen production with low harmful environmental emissions on account of utilizing carbon dioxide in the feed. However, carbon formation in the product stream has been the most challenging aspect of [...] Read more.
Methane dry reforming (MDR) is an attractive alternative to methane steam reforming for hydrogen production with low harmful environmental emissions on account of utilizing carbon dioxide in the feed. However, carbon formation in the product stream has been the most challenging aspect of MDR, as it leads to catalyst deactivation by coking, prevalent in hydrocarbon reforming reactions. Common strategies to limit coking have mainly targeted catalyst modifications, such as by doping with rare earth metals, supporting on refractory oxides, adding oxygen/steam in the feed, or operating at reaction conditions (e.g., higher temperature), where carbon formation is thermodynamically restrained. These methods do help in suppressing carbon formation; nonetheless, to a large extent, catalyst activity and product selectivity are also adversely affected. In this study, the effect of ammonia addition in MDR feed on carbon suppression is presented. Based on a thermodynamic equilibrium analysis, the most significant observation of ammonia addition is towards low temperature carbon dioxide activation to methane, along with carbon removal. Results indicate that ammonia not only helps in removing carbon formation, but also greatly enriches hydrogen production. Full article
(This article belongs to the Special Issue Catalytic Reforming of Methane)
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