Direct CO2 hydrogenation to light olefins over ZnZrOx mixed with hierarchically hollow SAPO-34 with rice husk as green silicon source and template

Tian, Jian ¹Tan, Kok Bing ²Guo, Meiting ²Han, Yating ³Fu, Tingjun ³Huang, Jiale ¹Li, Qingbiao ¹Tian, Pan ¹Zhan, Guowu²

扫码查看

作者信息

1. Xiamen Univ
2. Huaqiao Univ
3. Taiyuan Univ Technol
折叠

Abstract

Here, we present a new preparation strategy for hollow SAPO-34 with hierarchical porous structures using rice husk as a sole silicon source and porous template (viz., bio-SAPO-34). The hollow feature and acidity amount of the bio-SAPO-34 were highly dependent on the amount of rice husk in the synthetic solutions. The bio-SAPO-34 exhibited very high olefin selectivity (94.5 %) in the methanol-to-olefins reaction. Bifunctional catalysts con-sisting of ZnZrOx and bio-SAPO-34 were fabricated for the direct conversion of CO2 to light olefins. The C-2(=)-C-4(=) selectivity of 83 % and C-2(=)-C-4(=) space-time yield of 6.14 mmol g(cat)(-1) h(-1) was achieved with only 1 % undesired CH4 at 13.8 % CO2 conversion. Particularly, the CO selectivity from the reverse water-gas shift reaction was sup-pressed to a low value (40 %). Furthermore, the in-situ DRIFTS result indicates that CH3O* is the key interme-diate forming on the ZnZrOx surface and transferring to the Bronsted acid site of bio-SAPO-34 for selective C-C coupling.

Key words

CO2 hydrogenation/Light olefins/Bifunctional catalysts/Hollow SAPO-34/Tandem catalysis/HIGHLY SELECTIVE CONVERSION/OF-THE-ART/CARBON-DIOXIDE/CATALYSTS/METHANOL/AROMATICS/SYNGAS/OXIDE/ASSEMBLIES/DESIGN

引用本文复制引用

出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量21

参考文献量72

段落导航