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Catalysts
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Catalysts for Ammonia Decomposition
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Catalysts for Ammonia Decomposition

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

Deadline for manuscript submissions: closed (20 September 2023) | Viewed by 1677

Special Issue Editor

Dr. Gunther Kolb

E-Mail Website
Guest Editor
Fraunhofer IMM, Head of Division Energy, Carl-Zeiss-Straße, 55129 Mainz, Germany
Interests: catalysis; reaction engineering; kinetics; fuel processing; reforming; methanation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Currently, a greater awareness of world governments is leading towards independency from fossil fuels, especially those of unreliable origins. The shift towards renewable energy will require not only the conviction needed to drive clean energy transitions through both legal and political innovations, but also flexibility in addressing future uncertainties of the global energy market. From this perspective, a clean transition will require political, technological, economic, social and environmental changes.

Ammonia is an ideal hydrogen carrier that can facilitate the transportation of hydrogen from remote places. Over the past few decades, there have been a limited number of research efforts focussed on the design of catalysts for ammonia decomposition. Centralised and de-centralised plant concepts with different operating conditions and driven largely by economies of scale will be required in the near future; therefore, there is a need for reliable catalyst technology to fulfil these demands. However, in the context of the energy transition, decentralized production concepts will give rise to novel criteria for process design, such as compactness and process intensification. They also require novel catalyst technology.

We welcome contributions dealing with all kinds of catalyst technologies for ammonia decomposition, aiming towards an improved understanding of the reaction mechanisms and exploring cost reduction, stability and related issues.

Dr. Gunther Kolb
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

  • ammonia
  • decomposition
  • stability
  • mechanism
  • noble metal
  • catalysts

Published Papers (1 paper)

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Research

16 pages, 5094 KiB  
Article
Catalyst Coatings for Ammonia Decomposition in Microchannels at High Temperature and Elevated Pressure for Use in Decentralized and Mobile Hydrogen Generation
by Tobias Weissenberger, Ralf Zapf, Helmut Pennemann and Gunther Kolb
Catalysts 2024, 14(2), 104; https://doi.org/10.3390/catal14020104 - 26 Jan 2024
Viewed by 1400
Abstract
We report an investigation of catalyst performance for the decomposition of ammonia under industrially relevant conditions (high temperatures of up to 800 °C and an elevated pressure of 5 bar) with further emphasis on their stability at high reaction temperatures. The catalysts were [...] Read more.
We report an investigation of catalyst performance for the decomposition of ammonia under industrially relevant conditions (high temperatures of up to 800 °C and an elevated pressure of 5 bar) with further emphasis on their stability at high reaction temperatures. The catalysts were applied and tested as coatings in 500 µm wide channels of microreactors. Nickel-based catalysts were studied and compared to a ruthenium-based catalyst supported on SiO2. The effect of the support on the catalytic performance was investigated, and CeO2-supported nickel catalysts were found to exhibit the highest activity. Promoters were applied to increase the NH3 decomposition activity of the Ni/CeO2 catalysts. The addition of cesium led to a slight reduction in activity, while lanthanum, calcium, and barium doping resulted in increased activity. In particular, the barium-doped Ni/CeO2 catalyst showed very high ammonia conversion and closed the activity gap with respect to ruthenium catalysts at reactor temperatures of 650 °C and higher. The hydrogen production rates achieved in this work were compared to values in the literature and were shown to exceed values found earlier for both nickel- and ruthenium-based catalysts. Furthermore, the ruthenium-based catalysts under investigation were rapidly deactivated at 700 °C, while the nickel-based catalysts did not show deactivation after 220 h on time on stream at 700 °C. Full article
(This article belongs to the Special Issue Catalysts for Ammonia Decomposition)
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