The stabilization effect of Al2O3 on unconventional Pb/SiO2 catalyst for propane dehydrogenation

doi:10.1007/s11705-023-2315-y

Front. Chem. Sci. Eng.

2023, Vol. 17

Issue (10) : 1423-1429 https://doi.org/10.1007/s11705-023-2315-y

RESEARCH ARTICLE

The stabilization effect of Al₂O₃ on unconventional Pb/SiO₂ catalyst for propane dehydrogenation

Guowei Wang¹(

), Lanhui Zhou¹, Huanling Zhang²(

), Chunlei Zhu¹, Xiaolin Zhu¹, Honghong Shan¹

¹. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China
². SINOPEC (Dalian) Research Institute of Petroleum and Petrochemical Co., Ltd., Dalian 116000, China

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Abstract

Similar to Sn, Pb located at the same group (IVA) in the periodic table of elements, can also catalyze propane dehydrogenation to propene, while a fast deactivation can be observed. To enhance the stability, the traditional carrier Al₂O₃ with a small amount, was introduced into Pb/SiO₂ catalyst in this study. It has been proved that Al₂O₃ can inhibit the reduction of PbO, and weaken the agglomeration and loss of Pb species due to its enhanced interaction with Pb species. As a result, 3Al15Pb/SiO₂ catalyst exhibits a much higher stability up to more than 150 h. In addition, a simple schematic diagram of the change of surface species on the catalyst surface after Al₂O₃ addition was also proposed.

Keywords Pb/SiO₂ Al₂O₃ propane dehydrogenation propene stability

Corresponding Author(s): Guowei Wang,Huanling Zhang

Just Accepted Date: 10 May 2023 Online First Date: 30 June 2023 Issue Date: 07 October 2023

Cite this article:

Guowei Wang,Lanhui Zhou,Huanling Zhang, et al. The stabilization effect of Al₂O₃ on unconventional Pb/SiO₂ catalyst for propane dehydrogenation[J]. Front. Chem. Sci. Eng., 2023, 17(10): 1423-1429.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-023-2315-y
https://academic.hep.com.cn/fcse/EN/Y2023/V17/I10/1423

Fig.1 XRD patterns of fresh (a) xAl/SiO₂ and (b) xAl15Pb/SiO₂ catalysts with different Al loadings.

Fig.2 Catalytic performance of 15Pb/SiO₂ and xAl15Pb/SiO₂ catalysts for propane dehydrogenation.

Tab.1 BET specific surface area and pore properties of fresh xAl/SiO₂, fresh xAl15Pb/SiO₂ and spent xAl15Pb/SiO₂ catalysts

Fig.3 The dehydrogenation performance of 3Al15Pb/SiO₂ catalyst.

Fig.4 UV–Vis spectra of SiO₂ and xAl15Pb/SiO₂ catalysts with different Al loadings.

Fig.5 (a) ²⁷Al NMR of 3Al/SiO₂ catalyst and (b) ²⁷Al NMR of 3Al15Pb/SiO₂ catalyst.

Fig.6 H₂-TPR profiles of xAl15Pb/SiO₂ catalysts.

Fig.7 TEM images of 15Pb/SiO₂ and 3Al15Pb/SiO₂ catalysts: (a) fresh 15Pb/SiO₂, (b) spent 15Pb/SiO₂ reacted for 0.5 h, (c) fresh 3Al15Pb/SiO₂, (d) spent 3Al15Pb/SiO₂-1 reacted for 2 h, (e) spent 3Al15Pb/SiO₂-2 reacted for 206 h.

Scheme1 Schematic diagram of the change of surface species on the catalyst surface after Al₂O₃ addition.

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