Journal
BIORESOURCE TECHNOLOGY
Volume 101, Issue 23, Pages 9279-9286Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.06.079
Keywords
Chemical looping; Reforming; In-situ sorption; Waste oil; Nickel
Funding
- Engineering and Physical Research Science Council (EPSRC) [EP/D078199/1]
- Engineering and Physical Sciences Research Council [EP/D078199/1] Funding Source: researchfish
- EPSRC [EP/D078199/1] Funding Source: UKRI
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High purity hydrogen (>95%) was produced at 600 degrees C and 1 atm by steam reforming of waste cooking oil at a molar steam to carbon ratio of 4 using chemical looping, a process that features redox cycles of a Ni catalyst with the in-situ carbonation/calcination of a CO2 sorbent (dolomite) in a packed bed reactor under alternated feedstreams of fuel-steam and air. The fuel and steam conversion were higher with the sorbent present than without it. Initially, the dolomite carbonation was very efficient (100%), and 98% purity hydrogen was produced, but the carbonation decreased to around 56% with a purity of 95% respectively in the following cycles. Reduction of the nickel catalyst occurred alongside steam reforming, water gas shift and carbonation, with H-2 produced continuously under fuel-steam feeds. Catalyst and CO2-sorbent regeneration was observed, and long periods of autothermal operation within each cycle were demonstrated. (C) 2010 Elsevier Ltd. All rights reserved.
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