Preparation method of catalyst carrier material for purifying automobile tail gas
A technology of catalyst carrier and automobile exhaust, which is applied in the direction of catalyst carrier, catalyst activation/preparation, physical/chemical process catalyst, etc., can solve the problems of catalytic purification efficiency decrease, specific surface area decrease, poor thermal stability, etc., and increase the concentration of silanol , Increase the specific surface area, improve the effect of thermal stability
Inactive Publication Date: 2018-05-18
ANHUI HONGSHI OPTOELECTRONICS HIGH TECH CO LTD
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Problems solved by technology
Currently γ-Al 2 o 3 is the most widely used catalyst support, however γ-Al 2 o 3 Poor thermal stability, prone to phase change and sintering in high temperature environment, resulting in a significant decrease in specific surface area, leading to a significant drop in catalytic purification efficiency
Method used
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Experimental program
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Embodiment Construction
[0023] A method for preparing a catalyst carrier material for automobile exhaust purification, the preparation process comprising the following specific steps:
[0024] (1) Acidification treatment of sepiolite:
[0025] Add 30 parts by weight of sepiolite to 300 parts of distilled water, stir at room temperature for 6 hours to hydrate, let it stand for 30 minutes, filter and dry, add a certain concentration of strong acid solution, mix well, and set the temperature at 70°C Carry out hot acid treatment for 12 hours, after static precipitation, wash several times with deionized water, put into oven and dry after suction filtration, obtain the sepiolite after acidification modification;
[0026] (2) Preparation of γ-alumina:
[0027] Prepare 85 parts of isopropanol-water azeotrope, add 36 parts of aluminum isopropoxide to it, and carry out reflux hydrolysis reaction for 5 hours under magnetic stirring. After the reaction is completed, pressurize and steam the solvent to obtain h...
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The invention discloses a preparation method of a catalyst carrier material for purifying automobile tail gas. According to the method, sepiolite is treated by the aid of strong acid, H+ replaces Mg2+in a sepiolite framework structure, silica hydroxyl concentration is increased, carbonate impurities in a sepiolite ore are removed, branch channels in a sepiolite crystal are communicated, sepioliteand gamma-Al2O3 are mixed and crushed in a superfine manner, on one hand, hydroxyl on the surface of the gamma-Al2O3 can be effectively removed by the sepiolite after acid modification treatment in the crushing process, further crystallization of the gamma-Al2O3 is restrained under calcining at high temperature, so that heat stability of the gamma-Al2O3 is improved, on the other hand, superfine-crushed particles are thinner, air holes are mutually communicated and deep, space of a prepared carrier is large, and the carrier material has large specific surface area and has a wide application prospect in purification of the automobile tail gas.
Description
technical field [0001] The invention relates to the preparation of a catalyst carrier, in particular to a method for preparing a catalyst carrier material used for automobile exhaust purification. Background technique [0002] As a modern means of transportation, automobiles have brought a lot of convenience to people. However, a large amount of exhaust gas from automobiles has caused serious pollution to the atmospheric environment, especially causing great harm to people's health. Automobile exhaust purification catalyst is one of the most effective means to control automobile exhaust emissions and reduce pollution. It is favored for its excellent effectiveness and easy operation. With the extensive use of automobile exhaust purification catalysts, a large number of catalysts will be required, and the performance of the catalyst carrier directly affects the activity and purification effect of the catalyst, and plays an important role in the efficient performance of the ent...
Claims
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IPC IPC(8): B01J21/16B01J32/00B01J35/10B01J37/00B01J37/08
CPCB01J21/16B01J37/0009B01J37/0018B01J37/082B01J35/60
Inventor 徐道际张建波张成文邓书醒肖杰
Owner ANHUI HONGSHI OPTOELECTRONICS HIGH TECH CO LTD