SrGe_(0.7)Zr_(0.2)Eu_(0.1)O_3-based hydrogen transport water gas shift reactor

摘要

Proton-transport-membrane water gas shift (WGS) reactors, based on thin dense SrGe_(0.7)Zr_(0.2)Eu_(0.1)O_(3-δ) membranes on tubular Ni-SrCe_(0.8)Zro_(0.2)O_(3-δ) supports, were developed to increase H_2 yields relative to thermodynamic limitations. Pure H_2 permeate, total H_2 production, and reactor side CO conversion and H_2/CO effluent ratio were measured as a function of temperature, flow rate, CO concentration and H_2O/CO feed ratios. CO conversion, total H_2 production and yield, and the H_2/CO in the reactor side effluent increased with increasing temperature and H_2O/CO feed ratios. CO conversions of 84% and 90% were achieved at 900 ℃ with H_2O/CO feed ratios of 1/1 and 2/1, respectively. These respective 77% and 44% increases in CO conversion compared to feed gas condition thermodynamics resulted in 73% and 42% increases in H_2 production. Permeated H_2 and total H_2 production increased with increasing flow rate and CO concentration. Finally, membrane stability under WGS conditions was significantly improved by Zr substitution.