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Catalysts
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Advances in Reforming Catalysts for Hydrogen Production
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Advances in Reforming Catalysts for Hydrogen Production

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

Deadline for manuscript submissions: closed (31 May 2023) | Viewed by 9447

Special Issue Editors

Dr. Kee Young Koo

E-Mail Website
Guest Editor
1. Hydrogen Research Department, Korea Institute of Energy Research, Daejeon, Republic of Korea
2. Advanced Energy and System Engineering, University of Science and Technology (UST), Daejeon, Republic of Korea
Interests: hydrogen production (methane reforming, ammonia cracking); metal structured catalyst; catalyst coating; C1 chemistry; alcohol dehydration for Linear alpha-olefin(LAO) production
Dr. Unho Jung

E-Mail Website
Guest Editor
Hydrogen Research Department, Korea Institute of Energy Research, Daejeon, Korea
Interests: Methane reforming for hydrogen production; Ammonia(NH3) cracking for COx-free H2 production; Reformer design for fuel cell system

Special Issue Information

Dear Colleagues, 

Hydrogen is indispensable as an ecofriendly energy and energy storage media. Owing to environmental problems, such as air pollution, global warming, and fine dust, there is currently a growing need to move away from a carbon-based society dominated by fossil fuels such as coal, oil, and gas to a sustainable hydrogen-based society. Moreover, hydrogen has received attention as an alternative energy because it can be applied to various areas such as transport fuel, industrial heat source, and raw material of chemical products. Hydrogen can be produced from various processes, such as coal gasification, methane reforming, water electrolysis, NH3 cracking, etc.

 

As to a typical natural gas reforming reaction, there is steam methane reforming, dry (CO2) reforming of methane, and partial oxidation of methane. Various research works have been steadily conducted to address the deactivation problems for coking and sintering of reforming catalyst. In this Special Issue, we invite authors to submit original research and review articles that seek improvement of catalytic performance and stability for reforming reactions.

The potential topics in this Special Issue include but are not limited to:

  • Advances in reforming catalysts;
  • Catalyst deactivation: coking, sintering, poisoning;
  • Manufacture of reforming catalyst and operation in scale-up process;
  • Metal structured catalysts (monolith, foam) for hydrogen production;
  • Hydrogen production process via various feed such as coal, biomass, LOHC (liquid organic hydrogen carriers), ammonia, etc.

Dr. Kee Young Koo
Dr. Unho Jung
Guest Editor

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

  • hydrogen
  • reforming catalyst
  • coking
  • sintering
  • structured catalyst

Published Papers (5 papers)

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Research

11 pages, 2536 KiB  
Communication
Long-Term Hydrogen Production from a Methanol–Water Solution Catalyzed by an Iridium Complex
by Shohichi Furukawa, Kaito Kubota, Han Wang, Haotong Gong, Shumpei Kajita and Ken-ichi Fujita
Catalysts 2023, 13(6), 1027; https://0-doi-org.brum.beds.ac.uk/10.3390/catal13061027 - 20 Jun 2023
Cited by 1 | Viewed by 1236
Abstract
Long-term hydrogen production from a methanol–water solution was achieved by developing a new reaction system employing a homogeneous iridium catalyst bearing a bipyridonate-type functional ligand. By optimizing the methanol:water ratio of the reaction solution, the efficiency of hydrogen production was greatly improved in [...] Read more.
Long-term hydrogen production from a methanol–water solution was achieved by developing a new reaction system employing a homogeneous iridium catalyst bearing a bipyridonate-type functional ligand. By optimizing the methanol:water ratio of the reaction solution, the efficiency of hydrogen production was greatly improved in relation to that reported in our previous studies. Additionally, the effect of the scale of reaction was investigated. It was found that a small-scale reaction led to a longer lifetime of the iridium catalyst, accomplishing long-term continuous hydrogen production at a constant rate for over 500 h. Furthermore, procedures for catalyst reuse were studied. After hydrogen production for 400 h, all volatiles in the reaction system were removed under vacuum. This simple procedure is highly effective for the reactivation and reuse of the catalyst. Finally, hydrogen production (13.7 L, 562 mmol) from methanol (12.3 mL, 303 mmol) and water (5.46 mL, 303 mmol), in a continuous reaction for 800 h, was achieved. Full article
(This article belongs to the Special Issue Advances in Reforming Catalysts for Hydrogen Production)
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Graphical abstract

12 pages, 2573 KiB  
Article
Improving the Stability of Ru-Doped Ni-Based Catalysts for Steam Methane Reforming during Daily Startup and Shutdown Operation
by Tae-Young Kim, Jong-Heon Lee, Seongbin Jo, Jueon Kim, Jin-Hyeok Woo, Ragupathy Dhanusuraman, Jae-Chang Kim and Soo-Chool Lee
Catalysts 2023, 13(6), 949; https://0-doi-org.brum.beds.ac.uk/10.3390/catal13060949 - 30 May 2023
Cited by 1 | Viewed by 1297
Abstract
In this study, a Ru-doped Ni pellet-type catalyst was prepared to produce hydrogen via steam methane reforming (SMR). A small amount of Ru addition on the Ni catalyst improved Ni dispersion, thus affording a higher catalytic activity than that of the Ni catalyst. [...] Read more.
In this study, a Ru-doped Ni pellet-type catalyst was prepared to produce hydrogen via steam methane reforming (SMR). A small amount of Ru addition on the Ni catalyst improved Ni dispersion, thus affording a higher catalytic activity than that of the Ni catalyst. During the daily startup and shutdown (DSS) operations, the CH4 conversion of Ni catalysts significantly decreased because of Ni metal oxidation to NiAl2O4, which is not reduced completely at 700 °C. Conversely, the oxidized Ni species in the Ru–Ni catalyst can be reduced under SMR conditions because of H2 spillover from the surface of Ru onto the surface of Ni. Consequently, the addition of a small quantity of Ru to the Ni catalyst can improve the catalytic activity and stability during the DSS operation. Full article
(This article belongs to the Special Issue Advances in Reforming Catalysts for Hydrogen Production)
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14 pages, 1524 KiB  
Article
Effects of Operating Parameters and Feed Gas Compositions on the Dry Reforming of Methane over the Ni/Al2O3 Catalyst
by Eunju Yoo, Dong-Seop Choi, Jiyull Kim, Yoon-Hee Kim, Na-Yeon Kim and Ji Bong Joo
Catalysts 2023, 13(3), 602; https://0-doi-org.brum.beds.ac.uk/10.3390/catal13030602 - 16 Mar 2023
Cited by 2 | Viewed by 1883
Abstract
The effects of operating parameters such as reaction temperature, space velocity, and feed gas composition on the performance of the methane dry-reforming reaction (DRM) over the Ni/Al2O3 catalyst are systemically investigated. The Ni/Al2O3 catalyst, which is synthesized [...] Read more.
The effects of operating parameters such as reaction temperature, space velocity, and feed gas composition on the performance of the methane dry-reforming reaction (DRM) over the Ni/Al2O3 catalyst are systemically investigated. The Ni/Al2O3 catalyst, which is synthesized by conventional wet impregnation, showed well-developed mesoporosity with well-dispersed Ni nanoparticles. CH4 and CO2 conversions over the Ni/Al2O3 catalyst are dramatically increased as both the reaction temperature is increased, and space velocity is decreased. The feed gas composition, especially the CO2/CH4 ratio, significantly influences the DRM performance, catalyst deactivation and the reaction behavior of side reactions. When the CO2-rich gas composition (CO2/CH4 > 1) was used, a reverse water gas shift (RWGS) reaction significantly occurred, leading to the consumption of hydrogen produced from DRM. The CH4-rich gas composition (CO2/CH4 < 1) induces severe carbon depositions followed by a reverse Boudouard reaction, resulting in catalytic activity drastically decreasing at the beginning followed by a stable conversion. The catalyst after the DRM reaction with a different feed ratio was analyzed to investigate the amount and structure of carbon deposited on the catalyst. In this study, we suggested that the optimal DRM reaction conditions can achieve stable performances in terms of conversion, hydrogen production and long-term stability. Full article
(This article belongs to the Special Issue Advances in Reforming Catalysts for Hydrogen Production)
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Graphical abstract

13 pages, 2432 KiB  
Article
Efficient Catalysts of Ethanol Steam Reforming Based on Perovskite-Fluorite Nanocomposites with Supported Ni: Effect of the Synthesis Methods on the Activity and Stability
by Marina Arapova, Symbat Naurzkulova, Tamara Krieger, Vladimir Rogov and Vladislav Sadykov
Catalysts 2022, 12(10), 1151; https://0-doi-org.brum.beds.ac.uk/10.3390/catal12101151 - 01 Oct 2022
Cited by 4 | Viewed by 1139
Abstract
Catalysts based on perovskite—fluorite nanocomposites with supported nickel 5%Ni/[Pr0.15Sm0.15Ce0.35Zr0.35O2 + LaMn0.9Ru0.1O3] were synthesized by three different methods. Structural and surface features of as-prepared samples were elucidated by N [...] Read more.
Catalysts based on perovskite—fluorite nanocomposites with supported nickel 5%Ni/[Pr0.15Sm0.15Ce0.35Zr0.35O2 + LaMn0.9Ru0.1O3] were synthesized by three different methods. Structural and surface features of as-prepared samples were elucidated by N2 adsorption, XRD, HR TEM with EDX; reducibility and reactivity were estimated by H2-TPR, and catalytic properties were studied in ethanol steam reforming in the 500–700 °C temperature range. The best catalytic activity without coke accumulation was demonstrated for the 5%Ni/[Pr0.15Sm0.15Ce0.35Zr0.35O2+ LaMn0.9Ru0.1O3] catalyst with nanocomposite support obtained by a simple sequential polymeric preparation method. Highly dispersed particles of metallic nickel strongly fixed on the support after the reaction were shown by the HR-TEM and H2 –TPR data. The catalyst provides stable full conversion of ethanol and hydrogen yield above 60% at 600 °C for at least 6 h. Full article
(This article belongs to the Special Issue Advances in Reforming Catalysts for Hydrogen Production)
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13 pages, 2604 KiB  
Article
Influence of Supports on the Catalytic Activity and Coke Resistance of Ni Catalyst in Dry Reforming of Methane
by Da Hye Song, Un Ho Jung, Young Eun Kim, Hyo Been Im, Tae Ho Lee, Ki Bong Lee and Kee Young Koo
Catalysts 2022, 12(2), 216; https://0-doi-org.brum.beds.ac.uk/10.3390/catal12020216 - 14 Feb 2022
Cited by 6 | Viewed by 2940
Abstract
The dependence of the catalytic activity and coke resistance of Ni-based catalysts on the support type was investigated in the dry reforming of methane (DRM). Catalysts were prepared using incipient wetness impregnation and analyzed using ICP-OES, BET-BJH, XRD, H2-chemisorption, H2 [...] Read more.
The dependence of the catalytic activity and coke resistance of Ni-based catalysts on the support type was investigated in the dry reforming of methane (DRM). Catalysts were prepared using incipient wetness impregnation and analyzed using ICP-OES, BET-BJH, XRD, H2-chemisorption, H2-TPR, and CO2-TPD. DRM was performed at 600–750 °C at 144,000 mL/gcat∙h of GHSV (CH4/CO2/N2 = 1/1/1). Ni/Al2O3 and Ni/MgO catalysts formed NiAl2O4 and NiO-MgO solid solutions, respectively, owing to strong binding between the metal and support. In contrast, MgO-Al2O3 and MgAl2O4 supports suppressed NiAl2O4 and NiO-MgO solid solution formation, due to Mg addition, with high metal dispersions of 4.6 and 6.6%, respectively. In the DRM reaction, the Ni/MgO-Al2O3 and Ni/MgAl2O4 catalysts showed high CH4 conversions of 78.1 and 76.8%, respectively, compared with Ni/Al2O3 and Ni/MgO at 750 °C. A stability test was performed at 600 °C for 20 h. A coke study of the spent catalysts was performed using SEM and TGA. Alkaline-earth metal-containing catalysts Ni/MgO-Al2O3 and Ni/MgAl2O4 with strong CO2 adsorption properties showed 20 wt% reduction in carbon deposition compared to commercial catalysts. Therefore, the support and basic properties of the catalyst significantly influenced the catalyst performance and coke resistance in the DRM. Full article
(This article belongs to the Special Issue Advances in Reforming Catalysts for Hydrogen Production)
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