Pt0.5⁃Snx/γ⁃Al2O3催化剂对丙烷脱氢反应性能的影响

Effect of Sn Pt0.5⁃Snx/γ⁃Al2O3 Catalysts on the Performance of Propane Dehydrogenation

康津铭 焦建豪 秦玉才 杨野 王焕 宋丽娟

Jinming Kang Jianhao Jiao Yucai Qin Ye Yang Huan Wang Lijuan Song

辽宁石油化工大学 石油化工学院，辽宁 抚顺 113001 中国石油大学（华东） 化学工程学院，山东 青岛 266000

School of Petrochemical Engineering，Liaoning Petrochemical University，Fushun Liaoning 113001，China School of Chemical Engineering，China University of Petroleum（East China），Qingdao Shandong 266000，China

采用等体积顺序浸渍法，并运用超声波震荡的方法提高金属分散度，制备了不同Sn负载量（质量分数）的Pt0.5?Snx/γ?Al2O3催化剂。采用XRD、BET、H2?TPR、CO?IR、TG等表征手段对催化剂进行表征，考察了Sn负载量对Pt0.5?Snx/γ?Al2O3催化剂活性中心结构以及丙烷脱氢反应性能的影响。结果表明，通过改变样品中Sn的负载量来调控n（Sn）/n（Pt），会导致Pt和Sn的空间分布差异，从而影响Pt和Sn之间的作用模式；随着助剂Sn负载量的增加，由于Pt?Sn间的相互作用，有助于增加Pt的分散度，增加活性位点数，提高催化剂的反应活性；当负载过量的Sn时，会形成Pt?Sn合金团簇结构，导致Pt被包覆，从而使催化剂活性位点数减少，导致其反应活性下降。

Pt0.5?Snx/γ?Al2O3 catalysts with different Sn loads were prepared by constant volume sequential impregnation method and ultrasonic shock method to improve metal dispersion. The catalysts were characterized by XRD, BET, H2?TPR, CO?IR and TG, and the effects of Sn content on the active center structure and propane dehydrogenation performance of Pt0.5?Snx/γ?Al2O3 catalysts were investigated. The results showed that adjusting the n（Pt）/n（Sn） by changing the Sn content in the samples would lead to the difference in the spatial distribution of Pt and Sn species, and thus affect the mode of action between Pt and Sn. With the increase of Sn, the interaction between Pt?Sn helps to increase the dispersion of Pt, the number of active sites, the improvement of the reaction activity of the catalyst. However, when excessive Sn is introduced, a Pt?Sn alloy is formed, resulting in the coating of Pt, resulting in a decrease in the number of active sites and a decline in the reactivity.

国家自然科学基金项目(91961110)

10.12422/j.issn.1006-396X.2023.04.005