High purity H2 by sorption-enhanced chemical looping reforming of waste cooking oil in a packed bed reactor.
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 CO(2) 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 CO(2)-sorbent regeneration was observed, and long periods of autothermal operation within each cycle were demonstrated.
Pimenidou
P
P
Energy and Resources Research Institute, SPEME, The University of Leeds, Leeds LS2 9JT, UK.
Rickett
G
G
Dupont
V
V
Twigg
M V
MV
D000327:Adsorption; D001709:Biotechnology / Q000295:instrumentation* / Q000379:methods*; D002245:Carbon Dioxide / Q000032:analysis; D002248:Carbon Monoxide / Q000032:analysis; D003296:Cooking; D006859:Hydrogen / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry; D009584:Nitrogen / Q000737:chemistry; D009821:Oils / Q000032:analysis*; D010084:Oxidation-Reduction; D013227:Steam; D013816:Thermodynamics; D014866:Waste Products / Q000032:analysis*
D009821:Oils; D013227:Steam; D014866:Waste Products; D002245:Carbon Dioxide; D009532:Nickel; D002248:Carbon Monoxide; D006859:Hydrogen; D009584:Nitrogen