期刊
ACS CATALYSIS
卷 6, 期 7, 页码 4576-4583出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b00961
关键词
oxidation; dicarboxylic acids; cobalt catalyst; biomass; layered double hydroxide; sol-gel
资金
- joint National Science Foundation and Environmental Protection Agency program Networks for Sustainable Material Synthesis and Design [CHE 1339661]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1339661] Funding Source: National Science Foundation
In this paper, the performance of cobalt-based catalysts was reported for oxidation of glycerol to dicarboxylic acids such as tartronic and oxalic acids. Cobalt catalysts supported on Mg3Al(OH)(y)(CO3)(z) structures prepared by a two-step modified sol gel method showed 100% glycerol conversion with 64% and 24% selectivity toward tartronic and oxalic acids under mild conditions (55-70 degrees C and 0.1 MPa O-2). Surface and bulk characterization by N-2 adsorption/desorption, X-ray diffraction, and temperature-programmed reduction reveals that the cobalt sites interacting with surface hydroxides are catalytically more active than those incorporated into a framework leading to selective glycerol oxidation to dicarboxylic acids in one pot. On the basis of the experiments at different cobalt contents, temperatures, and concentration time profiles, possible reaction pathways are discussed to explain the selectivity profile. Deactivation of the catalyst under certain conditions has been discussed as a result of loss of surface area due to structural changes.
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