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

A technology of cu-sapo-34 and molecular sieve, which is applied in the direction of molecular sieve catalysts, separation methods, chemical instruments and methods, etc., can solve the problems of narrow activity temperature window, high preparation cost, and poor activity at low temperature, and achieve a wide activity temperature window, Low cost, enhanced low temperature activity effect

Pending Publication Date: 2020-07-24
DALIAN UNIV OF TECH PANJIN INST OF IND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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Embodiment 1

[0033] This embodiment discloses a Cu-SAPO-34 molecular sieve catalyst. The preparation method of the Cu-SAPO-34 molecular sieve catalyst comprises the following steps: mixing 8.8g of orthophosphoric acid with 30g of deionized water, and then mixing 5.1g of Add pseudo-boehmite slowly and stir until completely dissolved; add 4g of silica sol and stir for 2h, add 8g of morpholine, and then add 0.75g of cuproammonia complex dropwise; after stirring evenly, add ammonia dropwise to adjust the pH From 7 to 8, stir vigorously for 12 hours. The Cu-SAPO-34 molecular sieve initial gel was obtained. The mixture was transferred to a hydrothermal crystallization kettle, crystallized at 180° C. for 48 hours, and cooled to room temperature; after treatment, it was pressed into tablets to obtain a Cu-SAPO-34 molecular sieve catalyst.

[0034] On the fixed bed device, the Cu-SAPO-34 molecular sieve catalyst of this embodiment was used to carry out the simulation test of removing NOx from moto...

Embodiment 2～3

[0036] The Cu-SAPO-34 molecular sieve catalyst was prepared according to the steps and conditions of Example 1 and the activity test was carried out. To change the addition amount of silica sol, the changed conditions are listed in Table 1 and Table 2. The SCR activity test result of the Cu-SAPO-34 molecular sieve catalyst prepared by implementation cases 2-3 after calcination is in figure 1 given in.

Embodiment 4

[0038] This embodiment discloses a Cu-SAPO-34 molecular sieve catalyst. The preparation method of the Cu-SAPO-34 molecular sieve catalyst comprises the following steps: mixing 8.8g of orthophosphoric acid with 30g of deionized water, and then mixing 5.1g of Slowly add pseudo-boehmite and stir until completely dissolved; add 8g of silica sol and stir for 2h, add 8g of morpholine, and then add 0.75g of cuproammonia complex dropwise; after stirring evenly, add ammonia dropwise to adjust the pH From 7 to 8, stir vigorously for 12 hours. The Cu-SAPO-34 molecular sieve initial gel was obtained. The mixture was transferred to a hydrothermal crystallization kettle, crystallized at 180° C. for 48 hours, and cooled to room temperature; after treatment, it was pressed into tablets to obtain a Cu-SAPO-34 molecular sieve catalyst.

[0039] On the fixed bed device, the Cu-SAPO-34 molecular sieve catalyst of this embodiment was used to carry out the simulation test of removing NOx from moto...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01D53/56B01D53/94
CPCB01J29/763B01D53/9418
Inventor 肖永厚邱爽贺高红
Owner DALIAN UNIV OF TECH PANJIN INST OF IND TECH
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