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采用改进的等体积浸渍法制备了1.5%AU/AL2O3催化剂,考察了催化剂在CO低温氧化反应中的催化活性,比较了其在干燥的原料气和水汽饱和的原料气中的稳定性,考察了经水汽饱和或加热的空气处理后催化剂活性的变化,探讨了催化剂失活的原因.结果表明,AU/AL2O3在水汽饱和的原料气中比在干燥的原料气中具有更好的稳定性,经水汽饱和或加热的空气处理后其活性均会下降.AU/AL2O3的失活主要包括CO氧化失活、热处理失活和水汽处理失活,前两种失活主要是因为催化剂中类似碳酸盐物种的生成和活性位上-OH的脱除,是可逆失活;而最后一种失活是不可逆的,主要归因于金颗粒的长大.
A 1.5% AU / AL2O3 catalyst was prepared by the improved isostatic impregnation method. The catalytic activity of the catalyst in the low-temperature oxidation of CO was investigated. The stability of the catalyst in dry feed gas and water-saturated feed gas was investigated. The results show that AU / AL2O3 has better stability in the raw material gas saturated with water vapor than in the dry raw material gas, Water saturation or heated air treatment activity will be reduced.AU / AL2O3 deactivation include oxidation and deactivation of CO, heat treatment inactivation and water treatment inactivation, the first two kinds of inactivation is mainly due to the catalyst similar to carbonate The formation and activity of species-OH removal is reversible inactivation; the last inactivation is irreversible, mainly due to the growth of gold particles.