In-situ catalytic upgrading of bio-oil from rapid pyrolysis of biomass over hollow HZSM-5 with mesoporous shell
[Display omitted] •Hollow HZSM-5 catalysts with different Si/Al molar ratios were synthesized.•Hollow HZSM-5 with a Si/Al molar ratio of 30 showed a highest catalysis performance.•Treating hollow HZSM-5 with TPAOH further increased the catalysis performance.•Aromatic composition of 80.16% in upgrade...
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Veröffentlicht in: | Bioresource technology 2021-12, Vol.341, p.125874-125874, Article 125874 |
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Sprache: | eng |
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•Hollow HZSM-5 catalysts with different Si/Al molar ratios were synthesized.•Hollow HZSM-5 with a Si/Al molar ratio of 30 showed a highest catalysis performance.•Treating hollow HZSM-5 with TPAOH further increased the catalysis performance.•Aromatic composition of 80.16% in upgraded bio-oil from cedar wood was obtained.•High performance should be attributed to hollow structure with a mesoporous shell.
To solve the issue of narrow micropores in traditional protonic type Zeolite Socony Mobil-5 (HZSM-5) catalysts in the restricting of large-molecular reactants/products diffusion, hollow HZSM-5 with a mesoporous shell was prepared using a hydrothermal method combined with a tetrapropylammonium hydroxide (TPAOH) treatment process. Applying for in-situ catalyst upgrading of bio-oil from rapid pyrolysis of biomass, the obtained most efficient catalyst of Hollow(30)-TP resulted in aromatic hydrocarbon yields in the range of 78.49–78.67% for cellulose and hemicellulose, which is much greater than those using the traditional HZSM-5 (61.06–68.26%). Furthermore, in the case using real biomass (cedar) with an optimal biomass/catalyst weight ratio of 1:2, the aromatic hydrocarbon yield reached up to 80.16%. In addition, this catalyst exhibited excellent reusability and regeneration property due to the increased accessibility to the acid sites in the hollow HZSM-5 for the improving of the reaction rate as well as the reducing of coking. |
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ISSN: | 0960-8524 1873-2976 |
DOI: | 10.1016/j.biortech.2021.125874 |