Study of partial oxidation reforming of methane to syngas over self-sustained electrochemical promotion catalyst

摘要

A self-sustained electrochemical promotion (SSEP) catalyst is synthesized for partial oxidation reforming (POXR) of CH_4 to produce syngas (H_2 and CO) at a relatively low temperature ranging from 350 to 650 ℃. The SSEP catalyst is comprised of 4 components: microscopic Ni/Cu/CeO_2 anode, La_(0.9)Sro.iMnO_3 cathode, copper as electron conductor, and yttria-stabilized-zirconia as oxygen ion conductor, which form microscopic electro-chemical cells to enable the self-sustained electrochemical promotion for the POXR pro-cess. The SSEP catalyst exhibited much better catalytic performance in POXR of CH_4 than a Ni-Cu-CeO_2 catalyst and a commercial Pt-CeO_2 catalyst. The CH_4 conversion over the SSEP catalyst is 29.4% at 350 ℃ and reaches 100% at 550 ℃ and the maximum selectivity to H_2 is on the level of 90% at 450-650 ℃ under a GHSV of 42,000 h~(-1). The mechanism of the SSEP is discussed.