Hydrogen Production From Simulated Hot Coke Oven Gas By Usingoxygen-permeable Ceramics

摘要

Hydrogen production from simulated hot coke oven gas (HCOG) was investigated in a BaCo_(0.7)Fe_(0.2)Nb_(0.1)O_(3-δ) (BCFNO) membrane reactor combined with a Ni/Mg(Al)O catalyst by the partial oxidation with toluene as a model tar compound under atmospheric pressure. The reaction results indicated that toluene was completely converted to H_2 and CO in the catalytic reforming of the simulated HCOG in the temperature range from 825 to 875℃. Both thermodynamically predicated values and experimental data showed that the selective oxidation of toluene took precedence over that of CH_4 in the reforming reaction. At optimized reaction conditions, the dense oxygen-permeable membrane has an oxygen permeation flux around 12.3 mL cm~(-2) min~(-1), and a CH_4 conversion of 86%, a CO_2 conversion of 99%, a H_2 yield of 88%, and a CO yield of 87% have been achieved. When the toluene and methane were reformed, the amount of H_2 in the reaction effluent gas was about 2 times more than that of original H_2 in simulated HCOG. The results reveal that it is feasible for hydrogen production from HCOG by reforming hydrocarbon compounds in a ceramic oxygen-permeable membrane reactor.