Enhancing bio-oil quality and energy recovery by atmospheric hydrodeoxygenation of wheat straw pyrolysis vapors using Pt and Mo-based catalysts
| Autor: | Jens Ø. Duus, Chengxin Li, Andreas Eschenbacher, Asger B. Hansen, Jesper Ahrenfeldt, Alireza Saraeian, Ulrik Birk Henriksen, Brent H. Shanks, Peter Arendt Jensen, Uffe Vie Mentzel, Anker Degn Jensen |
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| Rok vydání: | 2020 |
| Předmět: |
Hydrogen
010405 organic chemistry Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology chemistry.chemical_element Coke Straw 010402 general chemistry 01 natural sciences 0104 chemical sciences Catalysis Fuel Technology chemistry SDG 7 - Affordable and Clean Energy Carbon Deoxygenation Hydrodeoxygenation Pyrolysis Nuclear chemistry |
| Zdroj: | Eschenbacher, A, Saraeian, A, Shanks, B H, Jensen, P A, Li, C, Duus, J Ø, Hansen, A B, Mentzel, U V, Henriksen, U B, Ahrenfeldt, J & Jensen, A D 2020, ' Enhancing bio-oil quality and energy recovery by atmospheric hydrodeoxygenation of wheat straw pyrolysis vapors using Pt and Mo-based catalysts ', Sustainable Energy & Fuels, vol. 2020, no. 4, pp. 1991-2008 . https://doi.org/10.1039/C9SE01254K |
| ISSN: | 2398-4902 |
| Popis: | Atmospheric hydrodeoxygenation (HDO) of wheat straw fast pyrolysis vapors was studied as a promising route for the production of renewable liquid transportation fuels. The performance of TiO2-supported Pt (0.5 wt%) and MoO3 (10 wt%) catalysts was compared to an industrial Mo-based catalyst using a bench scale reactor operated at atmospheric pressure and up to high biomass-to-catalyst ratios (B:C). Mass and energy balances were complemented by detailed bio-oil characterization including advanced methods such as GC×GC-ToF/MS or -FID and 13C NMR. At 50 vol% H2, all three HDO catalysts effectively reduced the oxygen content of the bio-oils to ∼7–12 wt% (dry basis) compared to a non-catalytic reference (23 wt% O). MoO3/TiO2 was least efficient in conversion of acids (TAN = 28 mg per KOH), while Pt/TiO2 and MoO3/Al2O3 obtained oils with TAN ∼ 13 mg KOH/g (non-catalytic = 66 mg KOH/g). Compared to the TiO2-supported catalysts, the industrial Mo/Al2O3 catalyst produced higher yields of coke at the expense of condensed bio-oil. MoO3/TiO2 performed similar to Pt/TiO2 in terms of deoxygenation and energy recovery of condensed bio-oil, and by increasing the H2 concentration to 90 vol% the energy recovery of bio-oil increased to 39 and 42% at 8 and 10 wt% O (d.b.), respectively. Pt/TiO2 showed the highest selectivity to aliphatics and the lowest coke yields, e.g. the coke yield at B:C ∼ 8 was only 0.6 wt% of fed biomass. This study demonstrates that by using low-pressures of hydrogen and appropriate HDO catalysts, the quality of bio-oil can be improved without severely compromising its quantity (carbon yield) as observed under catalytic fast pyrolysis conditions. |
| Databáze: | OpenAIRE |
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