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Catalysts
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Research Progress of Reforming Catalysts
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Research Progress of Reforming Catalysts

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Environmental Catalysis".

Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 7702

Special Issue Editors

Dr. Woohyun Kim

E-Mail Website
Guest Editor
Korea Institute of Energy Research, Daejeon, Korea
Interests: reforming catalysts, reactor modeling; optimal design
Prof. Dr. Kyubock Lee

E-Mail Website
Guest Editor
Graduate School of Energy Science and Technology, Chungnam National University, Daejeon, Republic of Korea
Interests: supported metal catalyst; methane reforming catalyst; H2 production; CO2 conversion
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Hydrogen is expected to become a widespread commercial energy in the areas of transportation, stationary and distributed power generation for solving global warming problems. Although reforming technologies are very matured for the mass production of hydrogen, there are still remaining R&D issues for various applications: small-scale on-site hydrogen production systems for refuelling stations, distributed fuel cell-based power generation, etc. In addition, the use of various types of fuels, such as natural gas, naphtha, alcohols, biogas, etc., requires the optimal design of catalysts and reaction conditions. Thus, the development of effective catalysts is essential for the wide adoption of hydrogen energy. This Special Issue will cover recent progress and trends in designing, synthesizing, characterizing and evaluating catalysts for hydrogen production processes, and therefore, hydrogen producing and purifying catalyses, such as various reforming reactions, water-gas-shift reactions and CO removal reactions, will be interesting research topics.

Best regards,

Dr. Woohyun Kim
Prof. Dr. Kyubock Lee
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 2200 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

  • hydrogen production catalysis
  • hydrogen purification catalysis
  • reforming reaction
  • water-gas-shift reaction
  • CO oxidation
  • CO methanation
  • CO removal

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Published Papers (3 papers)

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22 pages, 5542 KiB  
Article
Sustainable Synthesis of a Highly Stable and Coke-Free Ni@CeO2 Catalyst for the Efficient Carbon Dioxide Reforming of Methane
by Seung Bo Kim, Ahmed Al-Shahat Eissa, Min-Jae Kim, Emad S. Goda, Jae-Rang Youn and Kyubock Lee
Catalysts 2022, 12(4), 423; https://doi.org/10.3390/catal12040423 - 9 Apr 2022
Cited by 12 | Viewed by 2857
Abstract
A facile and green synthetic strategy is developed in this paper for the construction of an efficient catalyst for the industrially important carbon dioxide reforming of methane, which is also named the dry reforming of methane (DRM). Through controlling the synthetic strategy and [...] Read more.
A facile and green synthetic strategy is developed in this paper for the construction of an efficient catalyst for the industrially important carbon dioxide reforming of methane, which is also named the dry reforming of methane (DRM). Through controlling the synthetic strategy and Ni content, a high-performance Ni@CeO2 catalyst was successfully fabricated. The catalyst showed superb efficiency for producing the syngas with high and stable conversions at prolonged operating conditions. Incorporating Ni during the ceria (CeO2) crystallization resulted in a more stable structure and smaller nanoparticle (NP) size with a more robust interaction with the support than loading Ni on CeO2 supports by the conventional impregnation method. The H2/CO ratio was almost 1.0, indicating the promising applicability of utilizing the obtained syngas for the Fischer–Tropsch process to produce worthy chemicals. No carbon deposits were observed over the as-synthesized catalyst after operating the DRM reaction for 50.0 h, even at a more coke-favoring temperature (700 °C). Owing to the superb resistance to coke and sintering, control of the size of the Ni-NPs, uniform dispersion of the active phase, and potent metal interaction with the support, the synthesized catalyst achieved a magnificent catalytic activity and durability during serving for the DRM reaction for extended operating periods. Full article
(This article belongs to the Special Issue Research Progress of Reforming Catalysts)
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13 pages, 9118 KiB  
Article
Kinetic Study on CO-Selective Methanation over Nickel-Based Catalysts for Deep Removal of CO from Hydrogen-Rich Reformate
by Woohyun Kim, Khaja Mohaideen Kamal, Dong Joo Seo and Wang Lai Yoon
Catalysts 2021, 11(12), 1429; https://doi.org/10.3390/catal11121429 - 24 Nov 2021
Cited by 3 | Viewed by 1849
Abstract
The CO-selective methanation process is considered as a promising CO removal process for compact fuel processors producing hydrogen, since the process selectively converts the trace of CO in the hydrogen-rich gas into methane without additional reactants. Two different types of efficient nickel-based catalysts, [...] Read more.
The CO-selective methanation process is considered as a promising CO removal process for compact fuel processors producing hydrogen, since the process selectively converts the trace of CO in the hydrogen-rich gas into methane without additional reactants. Two different types of efficient nickel-based catalysts, showing high activity and selectivity to the CO methanation reaction, were developed in our previous works; therefore, the kinetic models of the reactions over these nickel-based catalysts have been investigated adopting the mechanistic kinetic models based on the Langmuir chemisorption theory. In the methanation process, the product species can react with the reactant and also affect the adsorption/desorption of the molecules at the active sites. Thus, the kinetic parameter study should be carried out by global optimization handling all the rate equations for the plausible reactions at once. To estimate the kinetic parameters, an effective optimization algorithm combining both heuristic and deterministic methods is used due to the large solution space and the nonlinearity of the objective function. As a result, 14 kinetic parameters for each catalyst have been determined and the parameter sets for the catalysts have been compared to understand the catalytic characteristics. Full article
(This article belongs to the Special Issue Research Progress of Reforming Catalysts)
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18 pages, 22131 KiB  
Article
The ‘Green’ Ni-UGSO Catalyst for Hydrogen Production under Various Reforming Regimes
by Mostafa Chamoumi and Nicolas Abatzoglou
Catalysts 2021, 11(7), 771; https://doi.org/10.3390/catal11070771 - 25 Jun 2021
Cited by 2 | Viewed by 2299
Abstract
A new spinelized Ni catalyst (Ni-UGSO) using Ni(NO3)2·6H2O as the Ni precursor was prepared according to a less material intensive protocol. The support of this catalyst is a negative-value mining residue, UpGraded Slag Oxide (UGSO), produced from [...] Read more.
A new spinelized Ni catalyst (Ni-UGSO) using Ni(NO3)2·6H2O as the Ni precursor was prepared according to a less material intensive protocol. The support of this catalyst is a negative-value mining residue, UpGraded Slag Oxide (UGSO), produced from a TiO2 slag production unit. Applied to dry reforming of methane (DRM) at atmospheric pressure, T = 810 °C, space velocity of 3400 mL/(h·g) and molar CO2/CH4 = 1.2, Ni-UGSO gives a stable over 168 h time-on-stream methane conversion of 92%. In this DRM reaction optimization study: (1) the best performance is obtained with the 10–13 wt% Ni load; (2) the Ni-UGSO catalysts obtained from two different batches of UGSO demonstrated equivalent performances despite their slight differences in composition; (3) the sulfur-poisoning resistance study shows that at up to 5.5 ppm no Ni-UGSO deactivation is observed. In steam reforming of methane (SRM), Ni-UGSO was tested at 900 °C and a molar ratio of H2O/CH4 = 1.7. In this experimental range, CH4 conversion rapidly reached 98% and remained stable over 168 h time-on-stream (TOS). The same stability is observed for H2 and CO yields, at around 92% and 91%, respectively, while H2/CO was close to 3. In mixed (dry and steam) methane reforming using a ratio of H2O/CH4 = 0.15 and CO2/CH4 = 0.97 for 74 h and three reaction temperature levels (828 °C, 847 °C and 896 °C), CH4 conversion remains stable; 80% at 828 °C (26 h), 85% at 847 °C (24 h) and 95% at 896 °C (24 h). All gaseous streams have been analyzed by gas chromatography. Both fresh and used catalysts are analyzed by scanning electron microscopy-electron dispersive X-ray spectroscopy (SEM-EDXS), X-ray diffraction (XRD), and thermogravimetric analysis (TGA) coupled with mass spectroscopy (MS) and BET Specific surface. In the reducing environment of reforming, such catalytic activity is mainly attributed to (a) alloys such as FeNi, FeNi3 and Fe3Ni2 (reduction of NiFe2O4, FeNiAlO4) and (b) to the solid solution NiO-MgO. The latter is characterized by a molecular distribution of the catalytically active Ni phase while offering an environment that prevents C deposition due to its alkalinity. Full article
(This article belongs to the Special Issue Research Progress of Reforming Catalysts)
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