Dehydrogenation of isobutane to isobutene over a Pt-Cu bimetallic catalyst in the presence of LaAlO3 perovskite

doi:10.1016/j.cjche.2020.07.027

Abstract

Abstract: In this study, isobutane dehydrogenation to isobutene reaction was carried out in a series of Pt-Cu bimetallic catalysts prepared by co-impregnation method. The catalysts were characterized by means of several techniques, including XRD, N₂ adsorption-desorption, TEM, XPS, H₂-TPR and TG. The results show that the existence of LaAlO₃ perovskite can enhance the dispersion and sintering resistance of metal nanoparticles and facilitate the transfer of carbon deposits from active sites to the support. Interestingly, the perovskite nanoparticles can also inhibit the reduction of CuO_x and the formation of PtCu alloys, resulting in the suitable interaction between Pt and Cu. The Pt-Cu/LaAlO₃/SiO₂ catalyst exhibits the optimal dehydrogenation performance with an isobutane conversion of 47% and isobutene selectivity of 92% after 310 min reaction, which was ascribed to the unique role of LaAlO₃ perovskite as well as the appropriate Pt-Cu interaction.

Key words: Isobutane dehydrogenation, Catalyst, Nanoparticles, Silica, LaAlO₃ perovskite, Pt-Cu interaction

摘要： In this study, isobutane dehydrogenation to isobutene reaction was carried out in a series of Pt-Cu bimetallic catalysts prepared by co-impregnation method. The catalysts were characterized by means of several techniques, including XRD, N₂ adsorption-desorption, TEM, XPS, H₂-TPR and TG. The results show that the existence of LaAlO₃ perovskite can enhance the dispersion and sintering resistance of metal nanoparticles and facilitate the transfer of carbon deposits from active sites to the support. Interestingly, the perovskite nanoparticles can also inhibit the reduction of CuO_x and the formation of PtCu alloys, resulting in the suitable interaction between Pt and Cu. The Pt-Cu/LaAlO₃/SiO₂ catalyst exhibits the optimal dehydrogenation performance with an isobutane conversion of 47% and isobutene selectivity of 92% after 310 min reaction, which was ascribed to the unique role of LaAlO₃ perovskite as well as the appropriate Pt-Cu interaction.

关键词: Isobutane dehydrogenation, Catalyst, Nanoparticles, Silica, LaAlO₃ perovskite, Pt-Cu interaction

Yanyong Li, Meng Ge, Jiameng Wang, Mengquan Guo, Fanji Liu, Mingxun Han, Yanhong Xu, Lihong Zhang. Dehydrogenation of isobutane to isobutene over a Pt-Cu bimetallic catalyst in the presence of LaAlO₃ perovskite[J]. Chinese Journal of Chemical Engineering, 2021, 32(4): 203-211.

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Dehydrogenation of isobutane to isobutene over a Pt-Cu bimetallic catalyst in the presence of LaAlO₃ perovskite

Dehydrogenation of isobutane to isobutene over a Pt-Cu bimetallic catalyst in the presence of LaAlO₃ perovskite

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