Chloride-free catalyst preparation method

Abstract

The invention provides a chloride-free catalyst preparation method. The chloride-free catalyst preparation method includes steps: (1) repeatedly exchanging NaY molecular sieves with 0.5mol / L ammonium nitrate solution for two times, wherein each-time exchange is carried out for 4h; (2) calcining for 4h at the temperature of 400 DEG C under the protection of N2 to obtain HY molecular sieves; (3) impregnating 5g of HY or NaY molecular sieves into an equivoluminal Cu(NO3)2 aqueous solution for 1h; (4) drying for 2h at the temperature of 105 DEG C, carrying out high-temperature activating treatment for 4h at the temperature of 600 DEG C under the protection of N2 to obtain chloride-free CuY catalysts including CuY-H and CuY-Na, wherein copper content of the catalysts is 10%. The chloride-free catalyst preparation method is simple, and catalyst products obtained according to the method are high in catalytic activity and practicality.

Description

technical field [0001] The invention relates to a preparation method of a catalyst, in particular to a preparation method of a chlorine-free catalyst. Background technique [0002] The oxidative carbonylation of methanol to dimethyl carbonate fDMCl is an important chemical reaction with very favorable thermodynamics. Atom utilization reaches 80%. At present, the catalysts used for this reaction include CuCl / AC (activated carbon) concave, Wacker-type and other chlorine-containing catalysts, Cu(I), molecular sieves, and solid acid-loaded Cu. Catalysts InI", Cu20, ACㅣ41 and other low-chlorine or chlorine-free catalysts. Among them, Cu(I) / molecular sieve catalysts are one of the hot research catalysts. In previous studies, Cu(I) / molecular sieve catalysts were mostly CuCl and H-type molecular sieve solids Prepared by ion exchange. Anderson et al. prepared Cu(I pus and CufI) / zSM 5 molecular sieve catalysts by solid ion exchange method with CuCl and HX, HZSM 5 molecular sieves, a...

AI Technical Summary

Problems solved by technology

CuCl is a catalyst prepared by ion exchange between copper source and H-type molecular sieve solid. Although the content of chlorine is reduced, it is difficult to completely eliminate the influence of chlorine