期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 10, 期 15, 页码 4831-4838出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.1c07071
关键词
Full hydrodeoxygenation; Guaiacol; Bimetallic PtNb PtW PtZr catalysts; Mesoporous KIT-6 support; Tunable acidity; Biofuels; Bio-oil
资金
- R. Games Slayter fund from Purdue University
- Varma Reaction Engineering fund from Purdue University
- Dan F. Servey Professorship funds (from the University of Kansas)
- Davidson School of Chemical Engineering at Purdue University
In this study, Pt supported on Nb, W, and Zr-incorporated KIT-6 catalysts were prepared and tested for the gas-phase hydrodeoxygenation (HDO) of a model compound of bio-oil. The results showed that the 1 wt % Pt/Nb-KIT-6 catalyst exhibited excellent HDO performance under relatively mild conditions, and the catalyst showed good resistance to coking.
Owing to a high oxygen content, bio-oils from the fastpyrolysis of biomass require upgrading to meet fuel specification standards.Catalytic hydrodeoxygenation (HDO) of bio-oils faces several challenges suchas low hydrocarbon yields, the requirement of high H2partial pressure forcomplete deoxygenation, and catalyst deactivation caused by coking/carbondeposition. In the present work, Pt supported on Nb, W, and Zr-incorporatedKIT-6 materials were prepared, characterized, and tested for the gas-phaseHDO of guaiacol, a widely used model compound of bio-oil. Facile HDO ofguaiacol was observed over a 1 wt % Pt/Nb-KIT-6 catalyst, with similar to 90%conversion and similar to 75% hydrocarbon selectivity under relatively mild hydrogenpartial pressure (0.5 MPa) at 400 degrees C and 33 h-1weight hourly space velocity(WHSV). No significant catalyst deactivation was observed during a 24-hcontinuous run indicating that the mesoporous support provides enhancedcoking resistance. Mechanistic investigations indicate that the tunable acidity of the supports promotes transalkylation reactions,which favor increased aromatic hydrocarbon yields. A plausible reaction mechanism is postulated based on correlating the number ofmetal and acid sites with the measured rates for the individual reaction steps.
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