Cu-SAPO-34 molecular sieve, preparation method thereof and application of Cu-SAPO-34 molecular sieve in selective catalytic reduction denitration

Abstract

The invention provides a Cu-SAPO-34 molecular sieve, a preparation method thereof and application of the Cu-SAPO-34 molecular sieve in selective catalytic reduction denitration. The invention also provides an SAPO-34 molecular sieve containing copper metal ions through one-step hydrothermal synthesis and a preparation method of the SAPO-34 molecular sieve. The Cu-SAPO-34 molecular sieve comprisesthe following components in parts by weight: a) 21-35.5 parts of SiO2; b) 38.5 to 47.5 parts of Al2O3; c) 22.5 to 27.5 parts of P2O5 (phosphorus pentoxide); and d) 2.5-6 parts of a copper-ammonia complex. The method provided by the invention can regulate and control the copper content and the silica-alumina ratio, and has the characteristics of low cost, simple process, environmental friendlinessand the like. The Cu-SAPO-34 molecular sieve catalyst provided by the invention has relatively high NOx removal efficiency, good low-temperature activity and a relatively wide active temperature window, and can still maintain excellent reaction activity at a relatively high space velocity.

Description

technical field [0001] The invention relates to molecular sieve catalyst technology and ammonia selective catalytic reduction to remove NOx, in particular to a Cu-SAPO-34 molecular sieve, its preparation method and its application in selective catalytic reduction and denitrification. Background technique [0002] Since the 20th century, with the rapid development of the national economy and the continuous improvement of people's living standards, the number of motor vehicles has also increased rapidly. However, while motor vehicles bring convenience to people's daily life, they also make the problem of environmental pollution increasingly prominent. Their exhaust emissions have become one of the important sources of air pollution in my country, which seriously affects people's normal life. Compared with gasoline vehicles, diesel vehicles have strong power, high thermal efficiency, low fuel consumption and CO 2 The advantages of less emissions, etc., account for an increasin...

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Problems solved by technology

[0008] The object of the present invention is to propose a method for preparing Cu-SAPO-34 molecular sieve, aiming at the problems of poor low-temperature activity, narrow activity temperature window, high preparation cost, and difficulty in industrialization of current denitration catalysts, and the Cu-SAPO-34 molecular sieve prepared by this method -SAPO-34 molecular sieve has high low temperature activity and wide activity temperature window

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