Denitration catalyst with SBA-15/TiO2 serving as carrier and preparing method thereof

A denitrification catalyst and carrier technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of complex flue gas components, low mass transfer efficiency, small specific surface area, etc., and achieve a wide activation temperature window , good mass transfer performance and large specific surface area

Active Publication Date: 2016-06-22
DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual working conditions of coal-fired power plants in my country, due to the complex composition of flue gas and large temperature changes, there are high requirements for the activity, thermal stability and service life of denitrification catalysts. At the same time, due to the traditional anatase TiO 2 The carrier has the disadvantages of small specific surface area, low mass transfer efficiency, and easy sintering and conversion into rutile in a high-temperature flue gas environment. Therefore, for TiO 2 Further improvement to prepare denitration catalysts with higher denitrification efficiency and better stability has become an upsurge. Among them, materials such as oxides and molecular sieves are combined with TiO 2 Composed of composite supports, it is an effective way to improve TiO 2 At present, in the field of SCR denitrification, the research and application of composite carriers are gradually deepening

Method used

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  • Denitration catalyst with SBA-15/TiO2 serving as carrier and preparing method thereof
  • Denitration catalyst with SBA-15/TiO2 serving as carrier and preparing method thereof
  • Denitration catalyst with SBA-15/TiO2 serving as carrier and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Using multi-block copolymer P123 as a template, ethyl orthosilicate as a silicon source, lanthanum nitrate as a precursor of La, and adjusting the pH value with hydrochloric acid, the SBA-15 molecular sieve with a framework containing rare earth metal element La was prepared by hydrothermal synthesis , based on the mass calculation of SBA-15 molecular sieve, the mass percent content of the rare earth metal element La is 5wt%; wherein, the specific steps of the hydrothermal synthesis method are: dissolving the triblock copolymer P123 in the hydrochloric acid solution, and then, sequentially Add lanthanum nitrate solution and ethyl orthosilicate, stir for 1 hour, transfer the mixed solution to a polytetrafluoroethylene-lined hydrothermal kettle, crystallize at 100°C for 20 hours, filter after cooling, wash with water and ethanol, and heat at 80°C Drying for 2 hours, and roasting at 450°C for 3 hours, the SBA-15 molecular sieve whose framework contains rare earth metals was...

Embodiment 2

[0026] Design a comparative test, the basic steps are the same as in Example 1, the difference is that the carrier used is the SBA-15 carrier containing the rare earth metal element La, rather than SBA-15 / TiO 2 Composite carrier, the specific steps are: use multi-block copolymer P123 as template agent, ethyl orthosilicate as silicon source, lanthanum nitrate as La precursor, adjust pH value with hydrochloric acid, and prepare skeleton containing rare earth metal by hydrothermal synthesis The SBA-15 molecular sieve of the element La, based on the mass calculation of the SBA-15 molecular sieve, the mass percentage content of the rare earth metal element La is 5wt%; wherein, the specific steps of the hydrothermal synthesis method are: dissolving the triblock copolymer P123 in hydrochloric acid solution, then add lanthanum nitrate solution and ethyl orthosilicate in sequence, and after stirring for 1 hour, transfer the mixture to a polytetrafluoroethylene-lined hydrothermal kettle,...

Embodiment 3

[0031] Design comparative experiments, the basic steps are basically the same as in Example 1, the difference is that the mechanical method is used to prepare SBA-15 / TiO 2 carrier, the specific steps are:

[0032] Using multi-block copolymer P123 as a template, ethyl orthosilicate as a silicon source, lanthanum nitrate as a precursor of La, and adjusting the pH value with hydrochloric acid, the SBA-15 molecular sieve with a framework containing rare earth metal element La was prepared by hydrothermal synthesis , based on the mass calculation of SBA-15 molecular sieve, the mass percent content of the rare earth metal element La is 5wt%; wherein, the specific steps of the hydrothermal synthesis method are: dissolving the triblock copolymer P123 in the hydrochloric acid solution, and then, sequentially Add lanthanum nitrate solution and ethyl orthosilicate, stir for 1 hour, transfer the mixed solution to a polytetrafluoroethylene-lined hydrothermal kettle, crystallize at 100°C fo...

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Abstract

The invention discloses a denitration catalyst with SBA-15 / TiO2 as a carrier and a preparing method thereof.The denitration catalyst comprises 36wt%-85wt% of SBA-15 molecular sieves, 10wt%-40wt% of TiO2, 0.1wt%-1wt%V2O5, 1wt%-10wt% of active assistant, 1wt%-8wt% of glass fibers and 0.5wt%-5wt% of forming assistant.The preparing method includes the steps that after a titanium salt solution and an electrolyte solution are mixed, SBA-15 molecular sieves with skeletons containing rare-earth metal are added to be soaked, and a series of reactions are carried out to obtained the SBA-15 / TiO2 carrier; the carrier, an ammonium-metavanadate active assistant, glass fibers and a forming assistant are mixed to obtain the denitration catalyst.The denitration catalyst and the preparing method have the advantages that the prepared denitration catalyst is large in specific surface area, high in hydrothermal stability, wide in active temperature window and high in denitration efficiency; meanwhile, the preparing method is simple.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a kind of SBA-15 / TiO 2 A denitrification catalyst as a carrier and a preparation method thereof. Background technique [0002] The flue gas emitted by coal-fired power plants in my country contains a large amount of NOx, which is one of the main pollutants in the atmosphere. In recent years, with the increasing demand for environmental protection, the use of effective means to control NOx emissions in flue gas has become a research hotspot in the environmental protection industry. Selective catalytic reduction (SCR) technology is characterized by its high denitrification efficiency, small footprint, and reliable operation. And other advantages, become the most widely used NOx emission control technology. [0003] Among the existing SCR denitration catalysts, V 2 o 5 As the active component, TiO 2 The vanadium-titanium series denitrification catalyst as the carrier has the highest in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/035
CPCB01J29/0341B01J2229/183
Inventor 黄力王虎李倩于爱华孙丹王晓伟董晓真张捷
Owner DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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