Chemical Looping Tar reforming with Fe,Sr-doped La2Zr2O7 pyrochlore supported on ZrO2
Artikel i vetenskaplig tidskrift, 2018

Chemical Looping Reforming (CLR) has been proposed as a new technology for tar removal from hot raw gas derived from biomass gasification. In this two-reactor fluidized bed process at atmospheric pressure, the bed material is circulating between a reformer, in which the bed material is in contact with the raw synthesis gas, and a regenerator, in which the bed material is regenerated by oxidizing coke deposits and sulfides with air. In this study Fe,Sr-doped La 2 Zr 2 O 7 pyrochlores supported on ZrO 2 with different Fe and Sr loadings were investigated for their use as a catalyst in CLR. By decreasing the Fe loading to Fe/La = 0.25 the benzene-to-syngas conversion could be improved by about 50% at T = 800 °C in comparison with the reference material with Fe/La = 1.25. With this material, benzene and ethylene conversion could be further improved by co-feeding O 2 with the gasification gas, achieving a benzene conversion of up to 80% and an ethylene conversion of about 95% at a temperature of 850 °C and a Gas Hourly Space Velocity of 6800 h −1 . The performance of the bed material was found stable over at least 3 redox cycles. Considering the expected lower costs and non-toxicity of this material compared to precious metal- and Nickel-containing catalysts, normally used in fixed-bed systems, it is a promising material for a fluidized CLR system for tar removal.


Tar reforming


Chemical-looping reforming


Fluidized bed


Martin Keller

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

David Philip Anderson

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Henrik Leion

Oorganisk miljökemi 2

Tobias Mattisson

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Applied Catalysis A: General

0926-860X (ISSN) 1873-3875 (eISSN)

Vol. 550 105-112


Kemiska processer

Annan kemiteknik




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