基于Cu/Beta沸石催化的生物质模型分子氧化裂解研究

In order to cleave C─C bonds of biomass organic macromolecules, a copper-loaded dealuminated H-Beta zeolite catalyst was proposed for heterogeneous oxidation. Using 1-phenyl-1,2-ethanediol as a model reactant, the performance of the prepared catalysts was investigated through catalyst preparation process discussion, physical property testing, reactivity characterization and stability tests. The results show that the cleavage reaction can only be carried out in the presence of both catalyst and oxygen. The reaction had a high conversion and benzaldehyde selectivity when using higher alcohols instead of methanol as solvent. The mechanism analysis shows that the oxidative cleavage of 1,2-diol is resulted from synergistic effects of Brønsted acid and Lewis acid, and the substitution of Cu for Al in the lattice of molecular sieve, and in the cycle of Cu⁺ to Cu²⁺, can adjust the acidity and acid amount of the catalyst, which effectively improves C─C bond breaking ability of the catalyst.