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Catalytic syngas purification from model biomass gasification streams

Paper ID Volume ID Publish Year Pages File Format Full-Text
54663 47019 2013 8 PDF Available
Title
Catalytic syngas purification from model biomass gasification streams
Abstract

•Nickel (Ni) and rhodium (Rh) containing catalysts were tested in simulated and oak bio-syngas streams.•Tar reforming was carried out with 100 ppm H2S at 700–900 °C.•Rh based catalysts were superior to Ni catalysts.•H2S deactivation was fully reversible and could be attributed to a transient site-blocking mechanism.•We report 200 h durability on NREL pilot-plant employing real oak syngas.

Efficient cleaning and conditioning of biomass derived syngas for use in fuel synthesis continues to be a significant technical barrier to commercialising biofuels. The relative effectiveness of a range of nickel and rhodium containing catalysts for the conversion of model tar compounds (toluene and naphthalene or benzene) in a simulated bio-syngas stream containing up to 100 ppm H2S and up to 5 vol.% CH4 at temperatures from 700 to 900 °C were assessed at JMTC.Though H2S was found to significantly reduce hydrocarbon conversion near complete conversion of methane and tar could be achieved on a Rh based catalyst at 900 °C with a very high GHSV of 150,000 h−1. At more realistic GHSV of 60,000 h−1 and higher methane levels (5 vol.%) the effect of H2S concentration on catalyst activity followed an apparent linear activity decay law. Furthermore, the H2S deactivation was fully reversible and could be attributed to a transient site-blocking mechanism (TSB).Selected catalysts were also evaluated at NREL for tar and methane conversions using oak modelled syngas. The best Ni and best Rh catalyst were then tested under real conditions using oak derived syngas from NREL's pilot scale gasification unit.Rh based catalysts gave significantly better hydrocarbon conversion than the Ni catalysts at comparable conditions. The best Rh catalyst demonstrated 200 h of steady state methane conversion of 95% with little apparent loss of activity using oak modelled syngas.

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Keywords
Rhodium; Nickel; Methane; Tar; Benzene; Oak wood
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Catalytic syngas purification from model biomass gasification streams
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 214, 1 October 2013, Pages 74–81
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