Effect of Alumina Binder on Catalytic Performance of PtSnNa/ZSM-5 Catalyst for Propane Dehydrogenation

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• 作者：Yiwei Zhang ; Yuming Zhou ; Anding Qiu ; Yu Wang ; Yi Xu ; and Peicheng Wu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2006
• 出版时间：March 29, 2006
• 年：2006
• 卷：45
• 期：7
• 页码：2213 - 2219
• 全文大小：117K
• 年卷期：v.45,no.7(March 29, 2006)
• ISSN：1520-5045

文摘

The influence of alumina binder on the catalytic performance of PtSnNa/ZSM-5 catalyst for propanedehydrogenation was studied. Solid-state ²⁷Al MAS NMR spectroscopy, temperature-programmed desorptionof ammonia (TPDA), temperature-programmed oxidation (TPO), catalytic grain intensity, hydrogen chemisorption, BET surface area, and pore size distribution measurements were used to characterize the catalysts.It was found that the addition of binder results in a decrease in the surface area of the catalyst but an obviousimprovement in its particle intensity. Some soluble Al species from the binder might migrate into the ZSM-5zeolite framework during calcination so as to produce some acid sites of moderate intensity, which consequentlyincreases the acid amount of the catalyst. When propane dehydrogenation is carried out under the same spacevelocity by changing the weight of the corresponding catalyst, the acid amount is the dominant factor influencingthe catalytic properties. When this reaction is performed under the same catalyst weight, a small amount ofbinder is seen to have a positive effect, increasing the catalytic activity as a result of the enhanced metaldispersion and acid amount. However, a negative effect is observed when the binder amount continues toincrease. The function of stabilizing the tin species can be strengthened by alumina addition, which mightfacilitate the transport of the carbon deposits from the active sites to the carrier. TPO profiles of thecorresponding catalysts under different reaction conditions represent dissimilar behaviors, which is attributedto an increase in acid amount and change in metal dispersion in the presence of binder. Finally, a model forthe influence of the alumina binder on the catalytic performance of PtSnNa/ZSM-5 catalyst for propanedehydrogenation is proposed.