The Effect of the Precipitator Concentration on the Activity of Mesoporous Cu-Ce-La Mixed Oxide Catalyst for Water-Gas Shift Catalyst

摘要

Cu-Ce-La mixed oxide catalysts were prepared by co-precipitation methods with a series of precipitator concentration and characterized using X-ray diffraction, BET, TPR, and catalytic reaction for the water-gas shift. The Cu-Ce-La mixed oxide prepared by 4.0 mol/L NaOH concentration presented the highest activity and thermal stability, the precipitator concentration influence the activity of catalyst via the stability of crystal structure and mesoporous structure. La~(3+) or Ce~(4+) substituted copper ion of CeO_2 framework during reaction process. The concentration of precipitator can control pore diameter of catalyst in synthetical process. The raising of precipitator concentration, from 0.5 to 2.0 mol/L, lead to enhancing of synergistic effects between CuO and CeO_2.