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.

Zirconia

Tar reforming

Pyrochlore

Chemical-looping reforming

Gasification

Fluidized bed

Författare

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

Ämneskategorier

Kemiska processer

Annan kemiteknik

Bioenergi

DOI

10.1016/j.apcata.2017.10.020

Mer information

Senast uppdaterat

2018-10-03