Denitration catalyst, method for preparing same and application of denitration catalyst

A denitration catalyst and catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of catalyst deactivation, pore blockage, single structure, etc., achieving simple preparation process, preventing pore blockage, The effect of high reaction efficiency

Inactive Publication Date: 2019-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently used molecular sieve carrier has a single pore structure, generally a microporous structure, which can easily lead to pore blockage and deactivation of the catalyst. The current synthesis method of molecular sieves with multi-level pores is still relatively complicated and expensive. A simple method for preparing multi-stage molecular sieves, preparing molecular sieves with micropores and mesoporous structures, increasing the specific surface area of ​​molecular sieves, reducing the synthesis cost of silica molecular sieves, will further improve its catalytic performance and industrial application prospects

Method used

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  • Denitration catalyst, method for preparing same and application of denitration catalyst
  • Denitration catalyst, method for preparing same and application of denitration catalyst
  • Denitration catalyst, method for preparing same and application of denitration catalyst

Examples

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Effect test

Embodiment 1

[0034] The preparation of multi-level porous all-silicon molecular sieve: adopt ethyl silicate-40 (wherein silicon dioxide mass content is 40%) TEOS is silicon source, tetrapropyl ammonium hydroxide (mass concentration 25%) TPAOH is template agent, with TEOS was slowly added to the aqueous solution of TPAOH at a mass ratio of 1:1, and magnetically stirred at room temperature for 2 h in the Erlenmeyer flask. Then it was transferred to a stainless steel hydrothermal kettle and reacted at a constant temperature of 180°C for 48h. After that, it was washed with deionized water, filtered, and dried at 120° C. for 12 hours. Furthermore, the prepared sample was placed in a tube furnace, and in an air atmosphere, the temperature was raised to 550° C. at a rate of 2° C. / min, and kept for 6 hours to obtain the hierarchical porous all-silicon molecular sieve silicalite-1. The SEM result of the all-silicon molecular sieve made is as follows figure 1 shown. N 2 The adsorption-desorption...

Embodiment 2

[0039] The preparation of all-silicon molecular sieve is the same as in Example 1.

[0040] The preparation of the catalyst is the same as in Example 1, except that the active components are loaded according to the loading ratio of 6% Mn and 6% Fe active components in mass percent.

[0041] The evaluation conditions of the catalyst are the same as those in Example 1. Using the catalyst prepared by the present invention, the conversion rate of NOx in the temperature range of 180-260° C. is 90%.

Embodiment 3

[0043] Preparation of multi-level porous all-silicon molecular sieve: use ethyl silicate-28 (wherein the mass content of silicon dioxide is 28%) TEOS as silicon source, tetrapropyl ammonium hydroxide TPAOH as template, with a mass ratio of 1:2 The ratio of TEOS was slowly added to the aqueous solution of TPAOH, in the Erlenmeyer flask, magnetically stirred at room temperature for 2h. Then the solution was transferred to a stainless steel hydrothermal kettle and reacted at a constant temperature of 160°C for 48h. After that, it was washed with deionized water, filtered, and dried at 120° C. for 12 hours. Further, the sample was placed in a tube furnace, and in an air atmosphere, the temperature was raised to 550° C. at a rate of 2° C. / min, and kept for 6 hours to obtain the hierarchical porous all-silicon molecular sieve silicalite-1.

[0044] Preparation of the catalyst: According to the loading ratio of the active components of 5% Ce, 6% Mn, and 4% Fe, respectively prepare a...

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Abstract

The invention provides a denitration catalyst, a method for preparing the same and application of the denitration catalyst. The denitration catalyst comprises carriers and active components. The carriers are hierarchical pore all-silicon molecular sieves, and the active components are selected from at least one type of transition metal and rare earth metal. The method for preparing the denitrationcatalyst includes adding silicon sources into aqueous solution of structure-directing agents, hydrolyzing the silicon sources for a period of time, then placing hydrolysis products in reaction kettles, carrying out hydrothermal crystallization reaction, and carrying out after-treatment on obtained products to obtain the hierarchical pore all-silicon molecular sieves; impregnating the hierarchicalpore all-silicon molecular sieves prepared at the step I in salt solution of the active components by the aid of impregnation processes, and carrying out after-treatment to obtain the denitration catalyst. The denitration catalyst, the method and the application have the advantages that the denitration catalyst is high in low-temperature activity and high in denitration efficiency, and the like.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a denitration catalyst and its preparation method and application. Background technique [0002] In recent years, the emission of nitrogen oxides (NOx) in my country has remained high, which has greatly affected national health and sustainable economic development. Currently, the commonly used V 2 o 5 -WO 3 / TiO 2 Type denitrification catalysts have disadvantages such as high operating temperature, harsh preparation conditions, high cost, and easy poisoning, so vigorously develop denitrification catalysts and denitrification technologies with independent intellectual property rights, especially low-temperature SCR (seletive catalytic reduction) catalysts are urgently needed at this stage. The problem. [0003] The catalyst device of the low-temperature SCR system is generally located in the dust collector and SO 2 After purifying the unit. Such a setting can ...

Claims

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Application Information

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IPC IPC(8): B01J29/03B01J29/035B01D53/90B01D53/56
Inventor 冯英杰冯静张明森姜健准刘东兵
Owner CHINA PETROLEUM & CHEM CORP
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