Au-Pt-Sn异丁烷脱氢催化剂的制备

以异丁烷为原料制取异丁烯是解决异丁烯稀缺和异丁烷浪费的双赢方法，异丁烷脱氢主要问题是催化剂的研发。国内外大量研究以Pt-Sn为活性组分，但仍然存在转化率偏低和容易失活等问题，而负载型纳米Au催化剂在低温时对CO氧化表现出很高的催化活性。在原有Pt-Sn催化剂基础上，加入Au，采用等体积浸渍法制备Au-Pt-Sn催化剂，比较Au对异丁烷脱氢催化剂转化率和选择性的影响，使用小型固定床不锈钢反应器，常压、温度600 ℃、空速2 400 h^-1和临氢条件下评价其性能。发现加入一定量Au后，增强了催化剂活性，n(Au)∶n(Pt)=1.0时，异丁烯收率大于40%。考察催化剂再生前后效果差异，发现经过再生后，异丁烷转化率和选择性略低有下降，表明催化剂可以再生利用。

Preparation of Au-Pt-Sn catalysts for isobutane dehydrogenation

Using isobutane as the raw material, the production process of isobutylene has the advantages of providing the source of isobutylene and high utilization of isobutane. Catalyst is the key factor of isobu- tane dehydrogenation. At present, the researches at home and abroad focus on the catalysts using platinum-tin as the active components. There exists the problems of low conversion rate and easy deactivation. The supported nano-gold catalysts for CO oxidation show high catalytic activity at low temperature. On the basis of original platinum-tin catalyst, Au-Pt-Sn catalyst was prepared by adding the gold and the equiva- lent-volume impregnation method. The effects of Au on the conversion and selectivity over the catalyst for velocity 2 400 h- 1 and hydrogen atmosphere. The results showed that the addition of Au promoted the activity of the catalyst. Isobutene yield of more than 40% was attained under the condition of n （Au） ： n （Pt） = 1.0. The performance of the catalyst before and after regeneration was also investigated. It was found that after regeneration,the conversion of isobutane and the selectivity to isobutene were slightly lower than those before regeneration, so the catalyst could be recycled.