Low temperature partial oxidation of methane via BaBi0.05Co0.8Nb0.15O3−δ-Ni phyllosilicate catalytic hollow fiber membrane reactor

Abstract

BaBi0.05Co0.8Nb0.15O3−δ (BBCN) hollow fiber membrane and Ni phyllosilicate catalyst were integrated to form a remarkable catalytic membrane reactor for partial oxidation of methane (POM) reaction at low temperature (650–750°C). This catalytic membrane reactor demonstrates a good catalytic-separation performance, achieving excellent hydrogen production rate of 33ml/min, high oxygen permeation flux through BBCN membrane of 15ml/min/cm2, good methane conversion of 80% and CO selectivity of 85% under low temperature (730°C), high reactant feeding rate (FCH4=25ml/min) and small amount of catalyst (20mg) during 100h of stability test. Several characterization techniques such as in situ high temperature XRD, SEM-EDX, TPR, TGA, BET and XPS were performed to further analyze and explain this remarkable performance. The good stability results reveal that the high oxygen permeation rate through BBCN hollow fiber membranes could prevent the hollow fiber membrane from breaking under high reducing gas concentration. Moreover, there is an optimum ratio of oxygen permeation flux to methane feeding rate to achieve high hydrogen production yield. If the oxygen permeation flux is higher than this optimum ratio, the excess oxygen will lead to deep oxidation of methane and loss of hydrogen selectivity.