期刊
BIORESOURCE TECHNOLOGY
卷 297, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.122477
关键词
Hydrothermal conversion; Hydrochar; Biochar; Solid acid catalysis; Deactivation behavior
资金
- National Key Research and Development Program of China [2016YFD0501402]
- National Natural Science Foundation of China [51861125103]
- Beijing Dairy Industry Innovation Team [BAIC06-2019]
Biochar made from biowaste provides renewable carbon precursors for catalysts preparation. Here, solid acid catalysts were prepared through functionalizing biochars produced via hydrothermal and pyrolytic carbonization of cornstalk with -SO3H groups. Hydrochar-based catalysts (HAC) and pyrochar-based catalysts (PAC) exhibited significantly different physiochemical properties, catalytic activities and deactivation behaviors. The test of catalytic effects on cellulose degradation uncovered that HAC had a higher density of -SO3H but lower surface special area than PAC. Specifically, PAC prepared at 400 degrees C resulted in the maximum increase of cellulose conversion by 16.00-50.50%. In comparison, the highest yields of glucose (11.14%) and 5-hydroxymethylfurfural (29.54%) were achieved catalyzed via HAC prepared at 240 degrees C. The results of catalyst deactivation behavior further revealed that used catalysts had an obvious reduction of -SO3H density. Interestingly, used HAC-240 catalysts showed similar patterns of weight loss to fresh ones due to its high stability.
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