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Preparation method of hierarchical porous Ti-ZSM-5 molecular sieve catalyst of automobile tail gas

An automobile exhaust, ti-zsm-5 technology, applied in molecular sieve catalysts, catalyst activation/preparation, separation methods, etc., can solve the problems of low temperature resistance and high cost, and achieve high oxygen storage capacity, low cost, and stable framework. effect of structure

Active Publication Date: 2018-09-21
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the technical problems of high cost and low high temperature resistance performance of existing automobile exhaust purification catalysts, and provides a preparation method of multi-level porous Ti-ZSM-5 molecular sieve automobile exhaust catalysts

Method used

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  • Preparation method of hierarchical porous Ti-ZSM-5 molecular sieve catalyst of automobile tail gas
  • Preparation method of hierarchical porous Ti-ZSM-5 molecular sieve catalyst of automobile tail gas
  • Preparation method of hierarchical porous Ti-ZSM-5 molecular sieve catalyst of automobile tail gas

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specific Embodiment approach 1

[0018] Specific embodiment one: the preparation method of the hierarchical porous Ti-ZSM-5 molecular sieve automobile exhaust catalyst of the present embodiment, carry out according to the following steps:

[0019] 1. Add the titanium source to dissolve in isopropanol to obtain a titanium source solution;

[0020] 2. Mix the surfactant, water and inorganic base according to the mass ratio of 1: (100-1650): (1.8-290) to obtain a mixed solution, and then add the silicon source to the mixed solution at a temperature of T1 = 70 Stir at ~85°C for 2-2.5 hours; then add the organic template agent dropwise to the mixture, after the dropwise addition, continue stirring at T1 for 2-2.5 hours to obtain a silicon source solution;

[0021] 3. Add the titanium source solution dropwise to the silicon source solution. After the dropwise addition, continue to stir for 4 to 4.5 hours under the condition of temperature T2, wherein T2=T1+10°C; obtain the mixed mother liquor;

[0022] 4. Transfer...

specific Embodiment approach 2

[0024] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the titanium source in step 1 is tetrabutyl titanate; the others are the same as Embodiment 1.

specific Embodiment approach 3

[0025] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in the titanium source solution in step 1, the concentration of the titanium source is 0.09-0.68 mol / L; other aspects are the same as Embodiment 1 or 2.

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Abstract

The invention discloses a preparation method of a hierarchical porous Ti-ZSM-5 molecular sieve catalyst of automobile tail gas and relates to a preparation method of a catalyst of automobile tail gas.The method aims at solving the technical problems of high cost and low high temperature resistance of the existing purification catalyst of the automobile tail gas. The method comprises the steps of:I, preparing a titanium source solution, II, preparing a silicon source solution, III, dropwise adding the titanium source solution into the silicon source solution for stirring to form mixed motherliquid, IV, adding the mixed mother liquid into a reaction kettle for crystallization, then performing washing and drying to form a precursor, and V, roasting the precursor to form the catalyst. An NOconversion rate of the catalyst can reach 94-98.5% at above 550 DEG C; a CO conversion rate can reach 85.2-88.6%; and the catalyst can treat the high-temperature automobile tail gas.

Description

technical field [0001] The invention relates to a preparation method of an automobile exhaust catalyst, belonging to the field of automobile exhaust treatment. Background technique [0002] Automobile exhaust pollution control can be divided into two kinds of technologies: in-machine and out-of-machine. Internal purification is mainly to improve fuel quality and fuel combustion conditions in the engine, and reduce the generation of pollutants as much as possible; the main way of external purification is to install catalytic converters, and the most effective external exhaust gas purification is to treat harmful gases. According to the method, the catalyst is the key to the purification effect, so the development of an efficient catalyst is one of the best measures to control vehicle exhaust emissions. With the improvement of catalyst preparation technology, two active centers of oxidation and reduction coexist on the same catalyst, and finally a three-way catalyst TWC (thre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/89B01J29/40B01J35/02B01J37/10B01D53/86B01D53/56B01D53/62B01J35/00
CPCB01D53/9418B01J29/40B01J29/89B01J37/10B01D2251/204B01D2257/502B01J2229/183B01J35/30B01J35/50Y02A50/20
Inventor 雷作涛牛晓冉杨春晖
Owner HARBIN INST OF TECH