期刊
ACS CATALYSIS
卷 4, 期 8, 页码 2437-2448出版社
AMER CHEMICAL SOC
DOI: 10.1021/cs500611g
关键词
CeO2 nanoshapes; structure dependence; acetaldehyde reaction; DRIFTS; temperature-programmed reaction; Aldol condensation; Cannizzaro disproportionation
资金
- Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, U.S. Department of Energy
- Oak Ridge National Laboratory by the Scientific User Facilities Division, Office of Basic Energy Science, U.S. Department of Energy
CeO2 cubes with {100} facets, octahedra with {111} facets, and wires with highly defective structures were utilized to probe the structure-dependent reactivity of acetaldehyde. Using temperature-programmed desorption (TPD), temperature-programmed surface reactions (TPSR), and in situ infrared spectroscopy, it was determined that acetaldehyde desorbs unreacted or undergoes reduction, coupling, or C-C bond scission reactions, depending on the surface structure of CeO2. Room-temperature FTIR indicates that acetaldehyde binds primarily as eta(1)-acetaldehyde on the octahedra, in a variety of conformations on the cubes, including coupling products and acetate and enolate species, and primarily as coupling products on the wires. The percent consumption of acetaldehyde ranks in the following order: wires > cubes > octahedra. All the nanoshapes produce the coupling product crotonaldehyde; however, the selectivity to produce ethanol ranks in the following order: wires approximate to cubes >> octahedra. The selectivity and other differences can be attributed to the variation in the basicity of the surfaces, defects densities, coordination numbers of surface atoms, and the reducibility of the nanoshapes.
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