Sediment and deposition preparing method of Pd/Mg(OH)2 catalyst and application of Pd/Mg (OH)2 catalyst

Abstract

The invention discloses a preparing method of a Pd / Mg(OH)2 catalyst and application of the Pd / Mg(OH)2 catalyst in a reaction of using CO gas phase catalysis coupling to synthesize dimethyl oxalate. According to the preparing method of the Pd / Mg(OH)2 catalyst and application of the Pd / Mg(OH)2 catalyst in the reaction of using gas phase catalysis coupling to synthesize dimethyl oxalate, a sediment and deposition method is utilized to uniformly fix precious metal Pd onto a carrier Mg(OH)2, thus the dispersity of the precious metal Pd on the carrier is obviously improved, the efficient utilization of the precious metal Pd is achieved, the aggregation and growth of precious metal Pd particles in a reaction process are inhibited, and the problem in the prior art that the dispersity of the precious metal Pd is low and the stability is low is effectively solved. In the obtained Pd / Mg (OH)2 catalyst, Mg(OH)2 is adopted as the carrier, and the precious metal Pd nanometer particles are adopted as an active component, wherein the load capacity of Pd accounts for, by mass, 0.01-1% of the carrier. The Pd / Mg(OH)2 catalyst is mainly used in industrial production of using CO catalysis coupling to synthesize a dimethyl oxalate catalyst.

Description

technical field [0001] The invention belongs to the technical field of preparation of dimethyl oxalate, and in particular relates to a preparation method and application of a catalyst for CO gas-phase catalytic coupling to synthesize dimethyl oxalate. Background technique [0002] Dimethyl oxalate is an important chemical raw material and reaction intermediate, widely used in the fields of pharmacy and organic chemical industry, the most important of which is that dimethyl oxalate can be used as an intermediate to prepare bulk chemical raw material B by low-pressure catalytic hydrogenation Diol, the successful development of this process can effectively alleviate the shortage of oil resources in my country. At present, the traditional production method of dimethyl oxalate is to use oxalic acid and methanol to produce through esterification reaction. Due to the shortcomings of long production cycle, large raw material consumption and serious environmental pollution, this proce...

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Problems solved by technology

Patent CN101791555A discloses a catalyst for the coupling reaction of CO and methyl nitrite to generate dimethyl oxalate. The catalyst uses Pd as an active component, and La and Re as auxiliary agents. Although the catalyst has a selectivity of dimethyl oxalate as high as 99 %, but the loading of noble metal Pd is as high as 1%, and the price of additives La and Re is also relatively expensive, which undoubtedly increases the production cost of the catalyst

Patent CN104190414B reports a method of preparing Pd / α-Al by sodium borohydride reduction 2 o 3 The preparation method of the catalyst, the dispersion degree of the catalyst active component Pd provided by the inventive method is lower than 30%, which is not conducive to the efficient utilization of the precious metal Pd

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