透氧膜反应器内NiO/MgO催化焦炉煤气重整反应途径

摘要

对透氧膜反应器内焦炉煤气(COG)重整反应模型进行分析.通过H2+N2、CH4+N2、CO+N2和H2+CH4+N2混合气在透氧膜反应器内重整反应,以及有无催化剂下重整反应和催化剂床层厚度重整反应实验,推测焦炉煤气重整反应模型:首先焦炉煤气中H2在催化剂活性金属镍颗粒上吸附解离,解离后的氢向高活性位迁移(“三相界面”)并与膜表面侧晶格氧(或O2-)反应生成H2O.同时CH4也可能在活性镍颗粒上裂解生成CH3*和H*,反应生成的H2O与膜表面催化剂上裂解的碳反应生成H2和CO.未反应完的H2O在催化剂床层内与剩余CH4反应生成H2和CO.%The reaction pathway for reforming coke oven gas (COG) in an oxygen permeation membrane was analyzed. Through the reforming experiments of H2+N2, CH4 + N2, CO + N2, H2+CH4+N2 mixtures, with or without a catalyst and the catalyst bed, the reaction scheme is proposed: H2 in COG is absorbed and dissociates on Ni particle on catalyst, the H' of dissociation migrates to high active site ("triphase boundary") and reacts with diffused oxygen or lattice oxygen on film surface to form H2O. The CH4 also could be dissociated on active metal surface to form CH3" and H". The H2O formed reacts with the C species to form H2 and CO. At last the residual H2O reacts with the residual CH4 on the catalyst bed to form H2 and CO.