Highly enhanced ammonia decomposition in a bimodal catalytic membrane reactor for COx-free hydrogen production |
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| Affiliation: | 1. HySA Infrastructure Centre of Competence, North-West University, Faculty of Engineering, Private Bag X6001, Potchefstroom Campus, 2520, South Africa;2. School of Chemical and Minerals Engineering, North-West University, Faculty of Engineering, Private Bag X6001, Potchefstroom Campus, 2520, South Africa;1. Lehrstuhl für Chemische Reaktionstechnik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany;2. Erlangen Catalysis Resource Center (ECRC), Egerlandstrasse 3, 91058 Erlangen, Germany |
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| Abstract: | Ammonia decomposition in a bimodal catalytic membrane reactor (BCMR) consisting of a Ru/γ-Al2O3/α-Al2O3 bimodal catalytic support and a hydrogen-selective silica membrane in a single unit was proposed for COx-free hydrogen production in the present study. The bimodal catalytic membrane showed a H2 permeance of 6.2 × 10-7 mol/(m2 s Pa) at 500 °C, with H2/NH3 and H2/N2 permeance ratios of 200 and 720, respectively. Ammonia conversion was surprisingly enhanced form 45 to 95% at 450 °C in the BCMR after selective H2 extraction. The BCMR showed excellent stability with respect to both gas permeation properties and catalytic activities. |
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