Preparing method for Cu-SAPO-18 molecular sieve catalyst of high hydrothermal stability

A thermal stability and catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, molecular sieves and alkali-exchanged phosphates, etc. The effect of hydrothermal stability

Inactive Publication Date: 2017-01-11
HEFEI SHENZHOU CATALSIS PURIFIER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently, V-W-TiO 2 The base catalyst is the most commonly used NH 3 -SCR catalyst, but its activity temperature window is narrow and its hydrothermal stability is poor, so it cannot meet the increasingly stringent emission standards

Method used

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  • Preparing method for Cu-SAPO-18 molecular sieve catalyst of high hydrothermal stability
  • Preparing method for Cu-SAPO-18 molecular sieve catalyst of high hydrothermal stability
  • Preparing method for Cu-SAPO-18 molecular sieve catalyst of high hydrothermal stability

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Embodiment 1

[0027] Preparation method of Cu-SAPO-18 molecular sieve catalyst with high hydrothermal stability. The aluminum source, phosphorus source, silicon source, template agent, and co-template agent for in-situ synthesis of Cu-SAPO-18 molecular sieve catalyst are Al 2 O 3 , Phosphoric acid, silica sol, triethylenetetramine, DMDMP (N,N-dimethyl-3,5-dimethylpiperidinium), the metal source is copper sulfate pentahydrate;

[0028] Proportion by mass: Al 2 O 3 49 parts, 85 parts of phosphoric acid, 27 parts of 40wt% silica sol, 16.4 parts of triethylenetetramine, 12.6 parts of DMDMP, 10-25 parts of copper sulfate pentahydrate;

[0029] The in-situ synthesis of Cu-SAPO-18 molecular sieve catalyst includes the following steps:

[0030] (1) DMDMP synthesis

[0031] According to the mass ratio, add 10 parts of 3,5-dimethylpiperidine and 19 parts of potassium bicarbonate to 120 parts of methanol, then add 110 parts of methyl iodide dropwise, and stir for 0.5-5 days at room temperature to obtain Solut...

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Abstract

The invention provides a preparing method for Cu-SAPO-18 molecular sieve catalyst of high hydrothermal stability. The invention relates to the field of treatment technology of exhaust gas of diesel engine. The sources of aluminum, phosphorus, silicon, and template for the in-situ synthesis of Cu-SAPO-18 molecular sieve catalyst are respectively Al2O3, phosphate, silica sol, trien and DMDMP, the source of metal is copper sulfate pentahydrate; by weight, it comprises 49 parts of Al2O3, 85 parts of phosphate, 27 parts of 40 wt % silica sol, 16.4 parts of trien, 12.6 parts of DMDMP and 10-25 parts of copper sulfate pentahydrate. Compared with the prior art, the Cu-SAPO-18 molecular sieve catalyst produced by the method has such advantages as high activity and high hydrothermal stability; new catalyst can have a conversion efficiency of more than 90% at the temperature range of 230-465oC; aged catalyst can maintain a conversion efficiency of more than 86% at the temperature range of 230-465oC after being placed in an environment of 750oC for 13h; the highest conversion efficiency of traditional V-W-TiO2 based catalyst is less than 60% after aging.

Description

Technical field [0001] The invention relates to the technical field of diesel engine exhaust gas treatment, in particular to a method for preparing a Cu-SAPO-18 molecular sieve catalyst with high hydrothermal stability. Background technique [0002] Diesel engines have been widely used at home and abroad due to their high economy and superior power performance. The main harmful pollutants in diesel vehicle exhaust are soot particles (PM) and nitrogen oxides (NOx), which seriously endanger the ecological environment and human health. [0003] Ammonia selective catalytic reduction technology (NH 3 -SCR) is a widely used denitration technology. Currently, V-W-TiO 2 The base catalyst is the most commonly used NH at home and abroad 3 -SCR catalyst, but its active temperature window is narrow, and its hydrothermal stability is poor, and it cannot meet increasingly stringent emission standards. Summary of the invention [0004] The purpose of the present invention is to provide a method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B37/08B01J29/85
CPCC01B39/54B01J29/85C01B37/08C01P2002/72
Inventor 邵利娜胡朝稳赵长军
Owner HEFEI SHENZHOU CATALSIS PURIFIER CO LTD
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