Oxidative esterification of 1,2-propanediol to high-value-added C3 chemicals
Using pseudo-boehmite as raw material,γ-Al2O3 catalyst was prepared by high-temperature calcination.Then 3Au/γ-Al2O3 catalyst was prepared by adsorption reduction method using γ-Al2O3 as carrier(where 3 is m(Au)∶m(catalyst)=3％).The morphology and structure of the catalyst were characterized by TEM,XRD,ICP-OES,and BET,and the catalytic performance of 3Au/γ-Al2O3 catalyst in the oxidative esterification of 1,2-propanediol to high-value-added C3 chemicals was investigated.The results showed that the efficient dispersion of Au particles was helpful to improve the performance of the catalyst.Under the optimal conditions,the conversion of 1,2-propanediol reached 63.0％and the selectivity of C3 chemicals reached 63.6％in a solvent system of methanol without alkaline additives.It was also found that increasing the Au loading in the catalyst may affect the occurrence of the reaction,thereby reducing the selectivity of the main product.
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