钯/陶瓷中空纤维复合膜反应器中的水煤气变换反应

Water-Gas Shift Reaction in a Pd/Ceramic Hollow Fiber Composite Membrane Reactor

采用化学镀法制备了钯/陶瓷中空纤维复合膜,并将该膜反应器用于水煤气变换反应,考察了水碳摩尔比、反应温度及压力对反应的影响.结果表明,膜反应器中的CO转化率不仅可以超过固定床反应器中的转化率,在一定条件下还可以超过反应的平衡转化率.

The water-gas shift reaction was carried out in a Pd/ceramic hollow fiber membrane reactor using a commercial iron-based catalyst with additive chromium. The composite membrane was prepared by the improved electroless plating method. The hydrogen permeability of the composite membrane was 0.165 m^3/（m^2· h· kPa） at 673 K, and the separation factor of pure hydrogen to argon was about 100. The influences of the H2O/CO molar ratio, reaction temperature and feed pressure on CO conversion were studied in detail. Under the same conditions, the CO conversion in the membrane reactor cannot only exceed that in the fixed-bed reactor but also exceed the thermodynamic equilibrium conversion owing to the selective removal of hydrogen from the reaction system by the composite membrane. These results demonstrate that it is possible to apply the Pd/γ-Al2O3 capillary membranes to the water-gas shift reaction.