Cerium, rhenium and phosphorus modified electrolytic silver catalyst as well as preparation method and application of cerium, rhenium and phosphorus modified electrolytic silver catalyst

Abstract

The invention belongs to the technical field of chemical catalysts and in particular relates to a cerium, rhenium and phosphorus modified electrolytic silver catalyst as well as a preparation method and application of the cerium, rhenium and phosphorus modified electrolytic silver catalyst. According to the cerium, rhenium and phosphorus modified electrolytic silver catalyst, carrier silver adopts electrolytic silver prepared by an electrolytic process; after the silver is subjected to heat treatment of water steam, crystal face reconstruction occurs to the electrolytic silver and the rough surface becomes smooth; the treated electrolytic silver is immersed and loaded with cerium, rhenium and phosphorus compounds and then is roasted after being dried; then the silver is subjected to heat treatment by the water steam again to prepare the cerium, rhenium and phosphorus modified electrolytic silver catalyst. The cerium, rhenium and phosphorus modified electrolytic silver catalyst can be used for carrying out catalytic oxidation on fatty alcohol or aromatic alcohol to generate corresponding aldehyde or ketone in one step; compared with the electrolytic silver catalyst applied in the current industry, the cerium, rhenium and phosphorus modified electrolytic silver catalyst has a very good iron poisoning resisting property.

Description

technical field [0001] The invention belongs to the technical field of chemical catalysts, and in particular relates to an electrolytic silver catalyst modified by cesium, rhenium and phosphorus, a preparation method and application thereof. Background technique [0002] Electrolytic silver has been used as a catalyst for the synthesis of corresponding aldehydes or ketones by gas-phase oxidation of alcohols for many years. At present, electrolytic silver catalysts are used in the production of formaldehyde by air oxidation of methanol and the synthesis of glyoxal by air oxidation of ethylene glycol. The electrolytic silver catalyst can be purchased directly from the market, and can also be easily prepared by electrolysis, such as U.S. Patent No. 5,135,624, which describes silver nitrate of 5 to 100 g / L as the electrolyte, pH 1 to 4, and electrolysis temperature of 10 to 10. 80℃, the current density is 100~3000A / m 2 A method for preparing an electrocrystallized silver cataly...

AI Technical Summary

Problems solved by technology

Therefore, a low amount of phosphorus modification cannot well inhibit iron poisoning, and a large amount of modification, such as greater than 80ppm, will seriously inhibit the activity of electrolytic silver, resulting in failure to initiate the reaction

[0005] Cesium and rhenium are two additives for modifying supported silver catalysts, which have a good effect in the epoxidation reaction of ethane, but when they are used to modify electrolytic silver, the selectivity decreases, so these two elements cannot be used for Improving the Performance of Electrolytic Silver Catalysts