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 1001

Special Issue 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

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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
Catalysts 2024, 14(2), 104; https://doi.org/10.3390/catal14020104 - 26 Jan 2024
Viewed by 754
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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