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High-purity syngas production by cascaded catalytic reforming of biomass pyrolysis vapors
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.ORCID iD: 0000-0002-8264-4736
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2022 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 322, article id 119501Article in journal (Refereed) Published
Abstract [en]

A novel pyrolysis followed by in-line cascaded catalytic reforming process without additional steam was developed to produce high-purity syngas from woody biomass. The key to the proposed process is the construction of a cascaded biochar + NiAl2O4 catalytic reforming process in which biochar acts as a pre-reforming catalyst, and NiAl2O4 acts as a primary reforming catalyst. The large oxygenates in the pyro-vapors are deeply cracked in the biochar layer due to the increased residence time in the hot-biochar bed. The remaining small molecules are then reformed with the autogenerated steam from pyrolysis catalyzed by the reduced Ni0 species in the NiAl2O4 catalyst (NiAlO). The results showed that the yield of syngas for the optimized process was 71.28 wt% (including 44.44 mg-H2/g-biomass and 536.48 mg-CO/g-biomass), and the CO2 yield of the process was only 3 kg-CO2/kg-hydrogen. High-purity syngas with 89.47 vol% of (H2 + CO) was obtained, and the gas energy conversion efficiency (GECE) of the process reached 75.65%. The study shows that in the cascaded catalytic reforming process, cracking of the large oxygenates and reforming of the small molecules are promoted sequentially in separated biochar + NiAlO catalyst layers, which maximizes the syngas production and improves the activity and stability of the Ni-based catalyst. © 2022 The Author(s)

Place, publisher, year, edition, pages
Elsevier Ltd , 2022. Vol. 322, article id 119501
Keywords [en]
Biomass, Cascaded catalysts, Pyrolysis, Reforming, Syngas, Aluminum compounds, Carbon dioxide, Catalysts, Catalytic reforming, Conversion efficiency, Molecules, Nickel compounds, Synthesis gas, Biochar, Biomass pyrolysis, Cascaded catalyst, High purity, Reforming Catalyst, Reforming process, Small molecules, Syn gas, Syngas production, ]+ catalyst, catalysis, catalyst, gas production, inorganic compound
National Category
Bioenergy
Identifiers
URN: urn:nbn:se:ri:diva-59823DOI: 10.1016/j.apenergy.2022.119501Scopus ID: 2-s2.0-85132935348OAI: oai:DiVA.org:ri-59823DiVA, id: diva2:1685691
Note

 Funding details: 51418-1; Funding details: China Scholarship Council, CSC; Funding text 1: We gratefully acknowledge the financial support by the Swedish Energy Agency – Energimyndigheten with project number 51418-1. One of the authors, Hanmin Yang would like to acknowledge the financial support from the Chinese Scholarship Council (CSC) and Stiftelsen Energitekniskt Centrum i Piteå, Sweden.

Available from: 2022-08-04 Created: 2022-08-04 Last updated: 2023-05-25Bibliographically approved

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