Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 10, Issue 4, Pages 1536-1543Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.1c06956
Keywords
aluminum phosphate; biomass conversion; catalytic transfer hydrogenation; furfural; furfuryl alcohol; sustainable chemistry
Categories
Funding
- Chinese State Council [201908330324]
- Department of Chemistry, Technical University of Denmark
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This study demonstrates that introducing alkali earth metal into aluminum phosphate catalyst can tune the acidity and basicity, thus improving the hydrogenation selectivity and reaction yield. The modified catalyst shows good stability and reusability, indicating its potential application in biomass refining processes.
Catalytic transfer hydrogenation (CTH) is a benign and effective process for the conversion of biomass-derived platforms into fuels and chemicals. Here, aluminum phosphate (Al/P ratio = 1.5) (APO1.5) and alkali earth metal (AEM)-loaded APO1.5s were synthesized by impregnation and applied in the CTH of furfural (FF) into furfuryl alcohol (FA). The introduction of AEM created weak and medium basic sites instead of weak acidic and strong basic sites in the pristine APO1.5, allowing co-catalysis of the AEM oxide species (basic sites) and the APO1.5 (acidic sites) to facilitate hydrogenation instead of etherification and acetalization. For 3 wt % Ca/APO1.5, this tuning of acidity and basicity improved the FA yield significantly from 54 to 90% (140 degrees C, 48 h), and the catalyst remained stable as well as reusable for at least four consecutive reactions with only slight deactivation. Notably, 3 wt % Ca/APO1.5 catalyst also showed high catalytic activity for CTH of other bio-derived aldehydes, thus demonstrating its versatile use for valorization of platforms generated during biomass refining.
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