Benzyl alcohol oxidation using in situ generated hydrogen peroxide from hydrogen and oxygen
mesheuropmc: inorganic chemicals
This thesis sets out an introduction to catalysis, particularly heterogeneous gold catalysis, the development of direct synthesis of hydrogen peroxide and benzyl alcohol oxidation by supported bimetallic gold-palladium catalysts. In addition the possibility of combining those two processes together to carry out the benzyl alcohol oxidation using in situ generated hydrogen peroxide.\ud The experimental chapter shows the detailed operation of preparing and testing of catalysts in particular for the reactions studied(H2O2formation, CO oxidation and benzyl alcohol oxidation).\ud In the results and discussion section, some basic knowledge of gold and palladium catalysis is reviewed including some popular preparation methods, the operation of the reactors, and testing in both direct synthesis of hydrogen peroxide and low-temperature CO oxidation. Afterwards, results of gold-palladium catalysis in the oxidation of benzyl alcohol using a mixture of hydrogen and oxygen are shown. In detail, some improvements for the reaction conditions, including temperature and duration, and catalysts, including gold and palladium ratios in alloys and the effect of preparation methods are discussed. In conclusion, higher reaction temperature (75oC) and longer reaction time (2 hours) seemed to be beneficial to converting benzyl alcohol to benzaldehyde by in situ generatedH2O2. Moreover, sol-immobilized1 wt% Au-Pd/TiO2with gold palladium ratio of 1:1 achieved the highest benzyl alcohol conversion and benzaldehyde selectivity among all samples with different metal ratios by different preparation methods.
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