A kind of method utilizing waste and old palladium catalyst to synthesize dimethyl oxalate catalyst

Abstract

The invention discloses a method for synthesizing a dimethyl oxalate catalyst by using a waste palladium catalyst. The leaching method is used to recover the metal palladium in the waste palladium-alumina catalyst. The remaining alumina pellets are washed, dried and roasted, and then reused. Load palladium and additives to prepare a catalyst for the reaction between methyl nitrite and CO to generate dimethyl oxalate. The extracted alumina balls are reused as catalyst carriers. The catalyst activity is good, the conversion rate of methyl nitrite and the selectivity of the product dimethyl oxalate are very good, the service life is long, and the adhesion of the carrier beads to palladium is significantly enhanced. The loss of precious metal palladium in the catalyst palladium-alumina is greatly suppressed.

Description

technical field

[0001] The invention belongs to the field of recovery and utilization of catalyst secondary resources, and in particular relates to a method for synthesizing a dimethyl oxalate catalyst by using a waste palladium catalyst. Background technique

[0002] Palladium is a catalyst often used in chemical and chemical reactions. There are many types of palladium-containing catalysts. Most of them are used in catalytic hydrogenation and catalytic oxidation in petrochemical industry. They have the advantages of high catalytic activity and good selectivity. , making many difficult-to-realize reaction processes possible, palladium is compounded with other metals or co-catalysts, and has better catalytic performance, such as palladium-based catalysts used in hydrogenation reactions, and supported platinum-rhodium-palladium triple-effect catalysts used in automobile exhaust purification Catalyst, Pd-Cu catalyst for ethylene oxidation to acetaldehyde, palladium-rhodium-pla...

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