Composite Ti-Si-molecular sieve coating integral denitration catalyst and preparation method thereof

A denitration catalyst, ti-si-technology, applied in the field of composite Ti-Si-molecular sieve coating integral denitration catalyst and its preparation, can solve the problems of poor anti-poisoning performance, single catalyst carrier composition, etc. The ability to resist H2O vapor and SO2 poisoning, the effect of enhancing surface acidity

Pending Publication Date: 2018-06-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above patents first loaded Al on the surface of the cordierite carrier 2 o 3 Coating, increase the surface area, but load the second carrier coating or directly load the active component, the catalyst carrier has a single component, and the anti-poisoning performance is poor

Method used

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  • Composite Ti-Si-molecular sieve coating integral denitration catalyst and preparation method thereof
  • Composite Ti-Si-molecular sieve coating integral denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of Ti-Si-molecular sieve composite sol: Add 450g of titanium sulfate and 300g of silica sol to 1800mL of nitric acid solution with a concentration of 0.6 mol / L, add 20g of urea, 20g of polyacrylamide and 15g of acetyl acetone. After stirring for a certain period of time, 60 grams of ZSM-5 molecular sieve was added and aged for 24 hours to obtain a transparent Ti-Si-molecular sieve composite sol.

[0030] (2) Preparation of Ti-Si-molecular sieve composite coating: Immerse the cordierite honeycomb matrix in the Ti-Si-molecular sieve composite sol prepared in step (1), take it out, blow off the residual liquid in the channel with compressed air, and Dry at 100°C for 12 hours, and bake at 600°C for 2 hours to obtain a carrier coated with a Ti-Si-molecular sieve composite coating.

[0031] (3) Loading active components: immerse the honeycomb ceramic carrier obtained in step (2) in a solution of 20g / L cerium nitrate, 30g / L ammonium molybdate and 4g / L tin tetr...

Embodiment 2

[0034] (1) Preparation of Ti-Si-molecular sieve composite sol: Add 450g of titanium sulfate and 400g of silica sol into 1800mL of 2mol / L nitric acid solution, add 40g of urea, 30g of polyacrylamide and 30g of acetylacetone while stirring . After stirring for a certain period of time, 70 grams of ZSM-5 molecular sieves were added and aged for 24 hours to obtain a transparent Ti-Si-molecular sieve composite sol.

[0035] (2) Preparation of Ti-Si-molecular sieve composite coating: Immerse the cordierite honeycomb matrix in the Ti-Si-molecular sieve composite sol prepared in step (1), take it out, blow off the residual liquid in the channel with compressed air, and Drying at 120°C for 8 hours and sintering at 550°C for 4 hours can obtain a carrier coated with a Ti-Si-molecular sieve composite coating.

[0036] (3) Loading active components: immerse the honeycomb ceramic carrier obtained in step (2) in a solution of 30g / L cerium nitrate, 50g / L ammonium molybdate and 6g / L tin tetra...

Embodiment 3

[0039] (1) Preparation of Ti-Si-molecular sieve composite sol: Take 450 g of titanium sulfate and 100 g of silica sol and add it to 1800 mL of nitric acid solution with a concentration of 4 mol / L, add 80 g of urea, 40 g of polyethylene glycol and 40 g of acetylene while stirring acetone. After stirring for a certain period of time, 50 grams of ZSM-5 molecular sieves were added and aged for 24 hours to obtain a transparent Ti-Si-molecular sieve composite sol.

[0040] (2) Preparation of Ti-Si-molecular sieve composite coating: Immerse the cordierite honeycomb matrix in the Ti-Si-molecular sieve composite sol prepared in step (1), take it out, blow off the residual liquid in the channel with compressed air, and Dry at 100°C for 12 hours, and bake at 400°C for 5 hours to obtain a carrier coated with a Ti-Si-molecular sieve composite coating.

[0041] (3) Loading active components: immerse the honeycomb ceramic carrier obtained in step (2) in a solution of 40g / L cerium nitrate, 6...

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Abstract

The invention relates to a composite Ti-Si-molecular sieve coating integral denitration catalyst and a preparation method thereof. The preparation method comprises the following steps: (1) preparationof Ti-Si-molecular sieve composite sol; (2) preparation of Ti-Si-molecular sieve composite coating; and (3) loading of active components. The denitration catalyst is prepared by using the above method. The preparation method of the invention is simple in process and low in cost. The prepared denitration catalyst is adaptive to a wide active temperature range and has high denitration activity andstrong resistance to SO2 and H2O poisoning.

Description

technical field [0001] The invention relates to a denitration catalyst, in particular to a composite Ti-Si-molecular sieve coated integral denitration catalyst and a preparation method thereof. Background technique [0002] Take NH 3 Selective catalytic reduction technology (SCR) as a reducing agent is one of the most effective methods to remove NOx (nitrogen oxides) in flue gas. Among them, the catalyst is the core of the technology. At present, the most widely used SCR catalyst is V 2 o 5 As an active component, TiO 2 As a carrier, add WO 3 or MoO 3 As a co-catalyst for medium and high temperature catalysts, it has high activity at 300-400°C, and its narrow range often cannot meet the requirements of large temperature changes under the use conditions. Second, V as the main active component 2 o 5 It is a highly toxic substance that is likely to cause secondary pollution to the human body and the environment. Moreover, V 2 o 5 Easy to remove SO from flue gas 2 O...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48B01D53/86B01D53/56
CPCB01D53/8628B01J29/48B01J37/0201
Inventor 王宽岭王学海刘淑鹤陈高升刘忠生
Owner CHINA PETROLEUM & CHEM CORP
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