Jianmin Sun

A novel catalyst of copper hydroxyphosphate with high activity in wet oxidation of aromatics

Abstract A novel catalyst of copper hydroxyphosphate (Cu 2 (OH)PO 4 ) that has neither microporous nor mesoporous pores was successfully synthesized by a hydrothermal method. Catalytic data in the hydroxylation of phenol, benzene and naphthol by hydrogen peroxide showed that copper hydroxyphosphate is a very active catalyst. Comparison of various catalysts on phenol hydroxylation suggests that the unusual catalytic activity on the Cu 2 (OH)PO 4 catalyst may be dependent on the unique structure of as-synthesized Cu 2 (OH)PO 4 . Characterization of catalytic phenol hydroxylation over Cu 2 (OH)PO 4 catalyst by electron spin resonance (ESR) gives very strong signals assigned to hydroxyl radical (•OH) species, the intensities of which are linearly related to the catalytic conversion, suggesting that hydroxyl radicals are important intermediates in the catalysis.

Catalytic hydroxylation of 2,3,6-trimethylphenol with hydrogen peroxide over copper hydroxyphosphate (Cu2(OH)PO4)

Abstract Catalytic hydroxylation of 2,3,6-trimethylphenol with hydrogen peroxide over copper hydroxyphospate Cu2(OH)PO4 was studied. Catalytic data shows that the Cu2(OH)PO4 catalyst is active, giving the theoretical conversion at 40.2%. The main products in this reaction are trimethylhydroquinone and trimethylbenzoquinone; there is particularly high selectivity for trimethylhydroquinone. When the reaction is carried out in air, the selectivity for trimethylhydroquinone is at 72.2% and when the reaction is carried out under N2, the selectivity is at 94.7%. The other important factors associated with the catalytic properties have been investigated extensively.

Catalytic epoxidation of styrene by molecular oxygen over a novel catalyst of copper hydroxyphosphate Cu2(OH)PO4

Catalytic epoxidation of styrene by molecular oxygen over a novel copper hydroxyphosphate catalyst, Cu2(OH)PO4, was studied. Catalytic data show that the catalyst Cu2(OH)PO4 is very active, and the main products are benzaldehyde and styrene epoxide. Some important factors associated with the catalytic activity and selectivity have been investigated extensively.

Catalytic epoxidation of styrene over copper hydroxyphosphate Cu2(OH)PO4

Catalytic epoxidation of styrene with hydrogen peroxide over copper hydroxyphosphate Cu2(OH)PO4 was studied. Catalytic data shows that the catalyst Cu2(OH)PO4 is very active, and the main products are styrene epoxide and benzaldehyde, particlularly giving high selectivity for styrene epoxide. In contrast, over TS-1 a large amount of phenylacetaldehyde product is formed. Some important factors associated with the catalytic activity and selectivity are investigated extensively.

A novel catalyst of copper hydroxyphosphate (Cu2(OH)PO4) with high activity in hydroxylation of phenol by hydrogen peroxide

A novel catalyst of copper hydroxyphosphate (Cu2(OH)PO4) that has not microporous and mesoporous pores (surface area