Effect Of Carrier Properties On Catalytic Activity For Green Alcohol Oxidation

As the demand of green oxidation process applied in alcohol oxidation increased, researches are making effort to develop high-efficient catalyst for alcohol oxidation under mild condition. This work discussed a certain relationship between the catalyst supporter and its catalytic behavior in iso-octanol oxidation process.1)The result indicated that, compared with supporters with little -OH dispersion, supporters with large -OH dispersion may lead to distinct behavior of catalyst supporters during the preparation process and the performance of derived catalysts in reaction.2)Further investigation on the effect of metal ions on the catalytic behavior of prepared catalyst revealed that the zinc could formed ZnOH+ particles and ZnO particles on the catalyst surface, among which ZnOH+ may increase the dehydrogenation ability of catalyst, ZnO could be the active sites of further oxidation process, respectively.3)For Fe/Cu-HZSM catalysts, the iron and copper may mainly formed bulk oxides that restrict their catalytic behavior in alcohol oxidation process. Moreover, cerium on the HZSM-5 can be in the form of both Ce(Ⅲ) and Ce(Ⅳ), and leads to higher selectivity for aldehyde production.4)Further, this work optimized the reaction condition for 4wt% Zn/HZSM-5(50) catalyzed iso-octanol oxidation process and obtained 55.1% octanol alcohol conversion and 27.0% yield of octanol acid in products. The recycle test showed that the Zn/HZSM-5(50) appeared to be stable for several runs of oxidation process, the limited loss of catalytic performance could result from the block of reaction substrate in the pore channel.