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Preparation method of composite modified zeolite molecular sieve catalyst

A zeolite molecular sieve and composite modification technology, applied in the field of denitration catalysts, can solve the problems of difficult control of distribution state and large difference in catalyst activity, and achieve the effects of wide temperature window, high catalytic activity and high thermal stability.

Active Publication Date: 2022-02-18
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the existing problems in the preparation of automobile exhaust denitrification catalysts, namely: Cu species in the catalytic active center (Cu + , Cu 2+ , CuO clusters) ratio and distribution state are difficult to control, resulting in a large difference in the activity of the catalyst. The invention provides a composite modification of Cu, Fe, rare earth metal elements, which utilizes the concentration gradient of the modification solution during the modification process Adjust the loading and species of metals to achieve the adjustment of the number and existence of catalytic active centers, and obtain a composite modified zeolite molecular sieve catalyst with high catalytic activity, wide temperature window and high thermal stability

Method used

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  • Preparation method of composite modified zeolite molecular sieve catalyst

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Experimental program
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Effect test

Embodiment 1

[0066] Put 10 g of SSZ-13 zeolite molecular sieve after dehydration pretreatment into 8M copper nitrate solution, stir at 50° C. for 10 h, and filter the obtained solid. Then put the above solid into 0.8M copper nitrate solution, stir at 50°C for 10h, and filter to obtain the solid. Then put the above solid into 0.08M copper nitrate solution, add 0.2g ferric nitrate and 0.34g cerium nitrate, stir at 50°C for 10h, and filter to obtain solid. The solid was dried and calcined to obtain a composite modified zeolite molecular sieve catalyst, which was designated as sample 1#.

Embodiment 2

[0068] Put 10 g of SSZ-13 zeolite molecular sieve after dehydration and pretreatment into 5M copper acetate solution, stir at 50° C. for 10 h, and filter the obtained solid. Then put the above solid into 0.5M copper acetate solution, stir at 50° C. for 10 h, and filter to obtain the solid. Then put the above solid into 0.05M copper acetate solution, add 0.2g ferric nitrate and 0.34g cerium nitrate, stir at 50°C for 10h, and filter to obtain the solid. The solid was dried and calcined to obtain a composite modified zeolite molecular sieve catalyst, which was designated as sample 2#.

Embodiment 3

[0070] Put 10 g of SSZ-13 zeolite molecular sieve after dehydration and pretreatment into 5M copper acetate solution, stir at 50° C. for 10 h, and filter the obtained solid. Then put the above solid into 0.5M copper acetate solution, stir at 50° C. for 10 h, and filter to obtain the solid. Then put the above solid into 0.05M copper acetate solution, add 0.2g ferric nitrate and 0.28g lanthanum nitrate, stir at 50°C for 10h, and filter to obtain the solid. The solid was dried and calcined to obtain a composite modified zeolite molecular sieve catalyst, which was designated as sample 3#.

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Abstract

The invention discloses a preparation method of a composite modified zeolite molecular sieve catalyst, in which a carrier zeolite molecular sieve subjected to dehydration pretreatment is placed in a modification solution with gradient change for multi-step impregnation. According to the preparation method, the loading capacity and species of metal can be regulated and controlled, so that the number and the existence state of catalytic active centers are regulated. The obtained composite modified zeolite molecular sieve catalyst has the characteristics of high catalytic activity, wide temperature window and high thermal stability, and has important application value in the field of automobile exhaust denitration.

Description

technical field [0001] The application relates to a preparation method of a composite modified zeolite molecular sieve catalyst, which belongs to the technical field of denitration catalysts. Background technique [0002] Nitrogen oxides (NO x ) is an important substance that pollutes the atmosphere, and its massive discharge will cause serious environmental problems such as acid rain, photochemical smog, and ozone layer destruction. Atmospheric NO x It mainly comes from emissions from stationary and mobile sources. Stationary sources mainly include power plants, cement plants and other industrial emissions, and mobile sources mainly include motor vehicles. Compared with mobile sources of motor vehicles, fixed sources of pollution (coal-fired power plants) are relatively concentrated. In recent years, under the macro-control of my country's policies, NO x The control effect is obvious, so the control of motor vehicle mobile sources will become a key link in my country's ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46B01J29/76B01D53/86B01D53/56
CPCB01J29/76B01J29/7615B01J29/46B01D53/8628B01J2229/186Y02A50/20
Inventor 刘家旭贺宁
Owner DALIAN UNIV OF TECH
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