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Chemical looping tar reforming using La/Sr/Fe-containing mixed oxides supported on ZrO2

Paper ID Volume ID Publish Year Pages File Format Full-Text
45159 46401 2016 10 PDF Available
Title
Chemical looping tar reforming using La/Sr/Fe-containing mixed oxides supported on ZrO2
Abstract

•La/Sr/Fe containing mixed oxides were supported on ZrO2 by dry impregnation.•Materials exhibited favourable properties for use in chemical looping tar reforming.•High benzene and ethylene conversion by steam reforming were observed.•Benzene conversion could be further increased by selective oxidation.

Biomass gasification gas contains condensable hydrocarbons usually referred to as “tars”. The use of chemical-looping reforming (CLR) has been proposed as a downstream technology for tar removal from the hot raw gasification gas. In this work two different ZrO2 support materials impregnated with La, Sr, Fe and mixtures thereof have been investigated as bed material for this proposed CLR process, with benzene and ethylene as tar surrogates. It was found that only combinations of La and Fe yielded significant catalytic activity for benzene conversion that could be further improved by adding Sr. Over this material, the benzene conversion reaction was found to be of first order with respect to benzene, and a simple kinetic model indicates that a high degree of benzene conversion can be obtained at reasonable residence times when the reactor temperature is sufficiently high (T = 850 °C). It was also observed that this material exhibited some activity for selective catalytic oxidation of benzene, which could further increase the tar conversion when either the bed material provided oxygen to the gas or a small stream of molecular O2 was added to the gasification gas feed. XRD analysis of the used bed materials revealed that a pyrochlore phase and SrZrO3 perovskite were formed during the experiment.

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Keywords
BET, Brunauer–Emmett–Teller; CLR, chemical looping reforming; DME, dimethyl ether; FT-IR, fourier transform infrared; SNG, substitute natural gas; XRD, X-ray diffraction; GHSV, gas hourly space VelocityTar reforming; Chemical-looping reforming; Gasificati
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Chemical looping tar reforming using La/Sr/Fe-containing mixed oxides supported on ZrO2
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 183, April 2016, Pages 298–307
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us