期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 6, 页码 5751-5763出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b05237
关键词
C-O ester cleavage; beta-O-4 lignin-type dimers; depolymerization; C modified MgO; acid-base property; palladium catalyst
资金
- NSFC (Natural Science Foundation of China) project [51606205, 51676191, 51536009]
- CAS Pioneer Hundred Talents Program
We developed a Pd-doped catalyst where the support MgO was modified with carbon species via methanol thermal annealing, catalyzing the cleavage of beta-O-4 lignin-type dimers and actual lignin into aromatics. Methanol as a carbon precursor was processed to a carbon species that was loaded with metallic palladium. The carbon species supported Pd on MgO surface changed the acid base strength and affected the catalytic activity of C-O bond hydrolysis/hydrogenolysis. The beta-O-4 linkage in dimer was effectively fractured over Pd/MgO-C, and catalyst's strong acid facilitated aldehyde decarboxylation to alkyl aromatics while relatively weak acid and strong base were highly selective for stable aromatics (such as 1-methoxy-4-propylbenzene and 1-methoxy-4-(propenlyl) benzene). This allowed Pd/MgO-C-700 to be successfully applied to pine depolymerization, to give 24.6 wt % of aromatics; in addition, almost beta-O-4 linkages were broken at 160 degrees C, and surprisingly, 77.2% of 2-methoxy-4-(propenlyl)phenols was obtained. The reaction pathways for lignin valorization are hypothesized over the Pd/MgO-C catalyst.
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