Kinetics of the water-gas shift reaction over a La_(0.7)Ce_(0.2)FeO_3 perovskite-like catalyst using simulated coal-derived syngas at high temperature

摘要

The kinetics of the water-gas shift (WGS) reaction over a novel La_(0.7)Ce_(0.2)FeO_3 perovskite-like catalyst is investigated using simulated coal-derived syngas at temperatures of 550 ℃ and 600 ℃ which are higher than the maximum operating temperature limit for conventional high temperature WGS catalysts. The influences of CO, CO_2, H_2O and H_2 concentration on WGS reaction rate are determined using selected gas compositions that might be encountered in a coal-based gasification system. An empirical power-law rate model used in this study is found to correlate well with experimental data with good accuracy. Kinetics parameters over La_(0.7)Ce_(0.2)FeO_3 obtained in this study are mostly in agreement with those previously measured using Fe-Cr based commercial catalysts in a range of relatively lower temperatures (300-500 ℃).