Direct CO2 hydrogenation to light olefins over ZnZrOx mixed with hierarchically hollow SAPO-34 with rice husk as green silicon source and template
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 synthe...
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Published in | Applied catalysis. B, Environmental Vol. 315; p. 121572 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
15.10.2022
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Subjects | |
Online Access | Get full text |
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Summary: | 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 consisting of ZnZrOx and bio-SAPO-34 were fabricated for the direct conversion of CO2 to light olefins. The C2=-C4= selectivity of 83 % and C2=-C4= space-time yield of 6.14 mmol gcat−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 suppressed to a low value (40 %). Furthermore, the in-situ DRIFTS result indicates that CH3O* is the key intermediate forming on the ZnZrOx surface and transferring to the Brønsted acid site of bio-SAPO-34 for selective C-C coupling.
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•Hollow SAPO-34 was prepared using rice husk as silicon source and template.•Bio-SAPO-34 showed different characters as compared to the conventional SAPO-34.•CO2 hydrogenation to light olefins was realized over the integrated nanocatalysts.•High C2=-C4= selectivity of 83 % and C2-C4 selectivity of 99 % were achieved.•Bifunctional catalyst showed high stability with good resistance to coke formation. |
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ISSN: | 0926-3373 1873-3883 |
DOI: | 10.1016/j.apcatb.2022.121572 |