Synergistic effect between Sn and K promoters on supported platinum catalyst for isobutane dehydrogenation

doi:10.1016/S1003-9953(10)60250-2

能源化学(英文) ›› 2011, Vol. 20 ›› Issue (6): 639-646.DOI: 10.1016/S1003-9953(10)60250-2

Synergistic effect between Sn and K promoters on supported platinum catalyst for isobutane dehydrogenation

Yiwei Zhang¹, Yuming Zhou¹*, Lihui Wan¹, Mengwei Xue^1,2, Yongzheng Duan¹, Xuan Liu¹

1. School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, Jiangsu, China; 2. Biochemical and Environmental Engineering College,
Nanjing Xiaozhuang University, Nanjing 211171, Jiangsu, China

收稿日期:2011-03-28 修回日期:2011-09-23 出版日期:2011-11-20 发布日期:2011-11-18
通讯作者: Yuming Zhou

Synergistic effect between Sn and K promoters on supported platinum catalyst for isobutane dehydrogenation

Yiwei Zhang¹, Yuming Zhou¹*, Lihui Wan¹, Mengwei Xue^1,2, Yongzheng Duan¹, Xuan Liu¹

1. School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, Jiangsu, China; 2. Biochemical and Environmental Engineering College,
Nanjing Xiaozhuang University, Nanjing 211171, Jiangsu, China

Received:2011-03-28 Revised:2011-09-23 Online:2011-11-20 Published:2011-11-18
Contact: YuMing

摘要/Abstract

摘要： Catalytic dehydrogenation of isobutane has recently received considerable attention because of the increasing demand for isobutene. In this study, the synergistic effect between Sn and K on PtSnK/γ-Al₂O₃ catalysts has been investigated by changing the content of Sn. It was found that with the presence of potassium, suitable addition of Sn could not only increase the metal dispersion, but also reduce the catalyst acidity. In these cases, the synergistic effect could also strengthen the interactions between the metal and support, which resulted in an increase in both catalytic activity and stability. In our experiments, Pt-0.6SnK/Al catalyst exhibited the lowest deactivation rate (12.4%) and showed a selectivity to isobutene higher than 94% at the isobutane conversion of about 45.3% after running the reaction for 6 h. However, with the excessive loading of Sn, surface property of active sites and the interactions between metal and support were changed. As a result, the initial optimal ratio between the metallic function and acid function would be destroyed, which was disadvantageous to the reaction.

关键词: synergistic effect, Pt-Sn, isobutane dehydrogenation

Abstract: Catalytic dehydrogenation of isobutane has recently received considerable attention because of the increasing demand for isobutene. In this study, the synergistic effect between Sn and K on PtSnK/γ-Al₂O₃ catalysts has been investigated by changing the content of Sn. It was found that with the presence of potassium, suitable addition of Sn could not only increase the metal dispersion, but also reduce the catalyst acidity. In these cases, the synergistic effect could also strengthen the interactions between the metal and support, which resulted in an increase in both catalytic activity and stability. In our experiments, Pt-0.6SnK/Al catalyst exhibited the lowest deactivation rate (12.4%) and showed a selectivity to isobutene higher than 94% at the isobutane conversion of about 45.3% after running the reaction for 6 h. However, with the excessive loading of Sn, surface property of active sites and the interactions between metal and support were changed. As a result, the initial optimal ratio between the metallic function and acid function would be destroyed, which was disadvantageous to the reaction.

Key words: synergistic effect, Pt-Sn, isobutane dehydrogenation

Yiwei Zhang, Yuming Zhou*, Lihui Wan, Mengwei Xue, Yongzheng Duan, Xuan Liu. Synergistic effect between Sn and K promoters on supported platinum catalyst for isobutane dehydrogenation [J]. 能源化学(英文), 2011, 20(6): 639-646.

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Synergistic effect between Sn and K promoters on supported platinum catalyst for isobutane dehydrogenation

Synergistic effect between Sn and K promoters on supported platinum catalyst for isobutane dehydrogenation

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