Investigation on POM reaction in a new perovskite membrane reactor

Investigation on POM reaction in a new perovskite membrane reactor,10.1016/S0920-5861(01)00277-2,Catalysis Today,Hui Dong,Zongping Shao,Guoxing Xiong,

Investigation on POM reaction in a new perovskite membrane reactor   (Citations: 26)
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A perovskite-type oxide of Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCFO) shows mixed (electronic/oxygen ionic) conductivity at high temperatures. Membrane made of the oxide has high oxygen permeability under air/helium oxygen partial pressure gradient. At 850°C, oxygen permeation rate maintained about 1.15ml/cm2min for more than 1000h under ambient air/helium oxygen gradient. A membrane reactor constructed from the oxide membrane was applied for the partial oxidation of methane (POM) to syngas, LiLaNiOx/γ-Al2O3 with 10wt.% Ni loading was used as the packed catalyst. At the initial stage, oxygen permeation rate, methane conversion and CO selectivity were closely related with the state of the catalyst. Less than 21h was needed for the oxygen permeation rate to reach its steady state. A membrane reactor made of BSCFO was successfully operated for POM reaction at 875°C for about 500h without failure, with methane conversion of >97%, CO selectivity of >95% and oxygen permeation rate of about 11.5ml/cm2min. Under membrane reaction condition, the POM reaction mechanism was suggested to obey the CRR (complete combustion of CH4 to CO2 and H2O and a subsequent reforming reaction of the residual CH4 and with CO2 and H2O to CO and H2) mechanism.
Journal: Catalysis Today - CATAL TODAY , vol. 67, no. 1, pp. 3-13, 2001
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