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

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

Abstract

Abstract:

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.

Key words: Propane dehydrogenation, Impregnation, Sn agent, Dispersion, Catalyst

摘要：

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。

关键词: 丙烷脱氢, 浸渍法, Sn助剂, 分散度, 催化剂

CLC Number:

TQ221

Jinming Kang, Jianhao Jiao, Yucai Qin, Ye Yang, Huan Wang, Lijuan Song. Effect of Sn Pt0.5⁃Snx/γ⁃Al₂O₃ Catalysts on the Performance of Propane Dehydrogenation[J]. Journal of Petrochemical Universities, 2023, 36(4): 34-39.

康津铭, 焦建豪, 秦玉才, 杨野, 王焕, 宋丽娟. Pt0.5⁃Snx/γ⁃Al₂O₃催化剂对丙烷脱氢反应性能的影响[J]. 石油化工高等学校学报, 2023, 36(4): 34-39.

Figures/Tables 7

References 27

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催化剂	丙烷转化率/%	丙烯选择性/%	失活参数
Pt0.5/γ⁃Al₂O₃	16.86	78.57	0.50
Pt0.5⁃Sn0.3/γ⁃Al₂O₃	21.59	84.63	0.44
Pt0.5⁃Sn1.0/γ⁃Al₂O₃	31.19	93.11	0.28
Pt0.5⁃Sn3.0/γ⁃Al₂O₃	40.18	94.51	0.14
Pt0.5⁃Sn5.0/γ⁃Al₂O₃	29.94	87.35	0.25

催化剂	丙烷转化率/%	丙烯选择性/%	失活参数
Pt0.5/γ⁃Al₂O₃	16.86	78.57	0.50
Pt0.5⁃Sn0.3/γ⁃Al₂O₃	21.59	84.63	0.44
Pt0.5⁃Sn1.0/γ⁃Al₂O₃	31.19	93.11	0.28
Pt0.5⁃Sn3.0/γ⁃Al₂O₃	40.18	94.51	0.14
Pt0.5⁃Sn5.0/γ⁃Al₂O₃	29.94	87.35	0.25

催化剂	比表面积/(m²·g^-1)	孔体积/(cm³·g^-1)	孔径/nm
Pt0.5/γ⁃Al₂O₃	214.35	0.48	9.03
Pt0.5⁃Sn0.3/γ⁃Al₂O₃	215.17	0.47	8.71
Pt0.5⁃Sn1.0/γ⁃Al₂O₃	219.52	0.47	8.58
Pt0.5⁃Sn3.0/γ⁃Al₂O₃	225.68	0.47	8.31
Pt0.5⁃Sn5.0/γ⁃Al₂O₃	217.36	0.46	8.46

催化剂	比表面积/(m²·g^-1)	孔体积/(cm³·g^-1)	孔径/nm
Pt0.5/γ⁃Al₂O₃	214.35	0.48	9.03
Pt0.5⁃Sn0.3/γ⁃Al₂O₃	215.17	0.47	8.71
Pt0.5⁃Sn1.0/γ⁃Al₂O₃	219.52	0.47	8.58
Pt0.5⁃Sn3.0/γ⁃Al₂O₃	225.68	0.47	8.31
Pt0.5⁃Sn5.0/γ⁃Al₂O₃	217.36	0.46	8.46

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

Pt0.5⁃Snx/γ⁃Al₂O₃催化剂对丙烷脱氢反应性能的影响

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References 27

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