One-step preparation method for Cu-SSZ-13 molecular sieve

Abstract

The invention discloses a one-step synthesis method for preparation of a Cu-SSZ-13 molecular sieve. According to the method, modified copper silica gel, an aluminum source, a template agent and an organic alkali source are adopted to form gel, the Cu-SSZ-13 molecular sieve is dynamically crystallized and hydrothermally synthesized, and an obtained molecular sieve sample shows excellent catalytic performance in NH3-SCR reaction. According to the molecular sieve synthesis method provided by the invention, ammonium exchange and copper exchange are not needed, Cu-SSZ-13 is directly synthesized by the one-step method, and a synthesis process is simple, reliable and easy to implement.

Description

technical field [0001] The invention relates to the technical field of catalysis, in particular to a method for preparing Cu-SSZ-13 molecular sieves in one step. Background technique [0002] Nitrogen oxides (NOx) will cause a series of environmental problems such as photochemical smog, acid rain and greenhouse effect, which have seriously endangered human health. With the increase in the number of motor vehicles and the rapid development of industry, the amount of NOx emissions is increasing. Cause serious deterioration of ecology and environment. Therefore, it is urgent to eliminate the problem of NOx pollution. At present, the dominant NOx control technology is NH3 Selective Catalytic Reduction (NH3-SCR), the key to which is to select a catalyst with excellent performance, which will determine the success or failure of the entire catalytic reaction system. [0003] Selective catalytic reduction (selective catalytic reduction, abbreviated as SCR) catalyst is a catalyst u...

AI Technical Summary

Problems solved by technology

[0006] In the prior art, the manufacturing method of Cu-SSZ-13 molecular sieve generally adopts the following method: add template agent to silicon source and aluminum source, stir in the presence of alkali and carry out hydrothermal synthesis, prepare hydrogen molecular sieve and then Use copper salts to load copper, and then process again to obtain Cu-SSZ-13 molecular sieves. The molecular sieves synthesized by this method are complex in process and relatively high in cost, which virtually reduces market competitiveness.

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