Impregnation-coating method for rapidly preparing Cu-SSZ-13 monolithic catalyst and application of monolithic catalyst

A monolithic catalyst, cu-ssz-13 technology, applied in the direction of catalyst activation/preparation, molecular sieve catalyst, physical/chemical process catalyst, etc., can solve the problems of long time consumption, large amount of waste water, high energy consumption in the production process, and achieve reduction Production energy consumption, high SCR denitrification catalytic activity, satisfying the effect of tail gas denitrification

Inactive Publication Date: 2019-01-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition to the disadvantages of the aforementioned ion exchange method, such as long time consumption and large amount of waste water, at least two roastings are required in the ion exchange and coating process, resulting in high energy consumption in the production process

Method used

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  • Impregnation-coating method for rapidly preparing Cu-SSZ-13 monolithic catalyst and application of monolithic catalyst
  • Impregnation-coating method for rapidly preparing Cu-SSZ-13 monolithic catalyst and application of monolithic catalyst

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Embodiment 1

[0027] The Cu salt precursor used in this embodiment is copper nitrate trihydrate (Cu(NO 3 ) 2 ·3H 2 O), the impregnation method adopted is the equal volume impregnation method, and the Cu content accounts for 2% of the dry mass of the mixture. The prepared Cu-SSZ-13 precursor mixture is firstly dried to obtain a precursor powder, which is then used for slurry coating and finally roasted.

[0028] The specific process is as follows: Weigh 22.7g of copper nitrate trihydrate, dissolve it in 170mL of deionized water, mix it with 300g of H-type SSZ-13 molecular sieve powder at room temperature to obtain the catalyst precursor sludge, and obtain the catalyst precursor powder after drying. Add appropriate amount of water to the obtained powder, disperse by ball milling, then add binder and thickener to prepare a slurry with a solid content of 40g / 100g, and coat it on a 400cpsi cordierite honeycomb carrier with a coating amount of 160g / L. After drying, it was calcined at 550° C. f...

Embodiment 2

[0030] The Cu salt precursor used in this embodiment is copper nitrate trihydrate (Cu(NO 3 ) 2 ·3H 2 O), the impregnation method adopted is the equal volume impregnation method, and the Cu content accounts for 2% of the dry mass of the mixture. The prepared Cu-SSZ-13 precursor wet mud is directly used for slurry coating without drying, and finally roasted.

[0031] The specific process is as follows: Weigh 22.7g of copper nitrate trihydrate, dissolve it in 170mL of deionized water, and mix it with 300g of H-type SSZ-13 molecular sieve powder at room temperature to obtain catalyst precursor sludge. Add an appropriate amount of water to the mud, and then add a binder and a thickener to prepare a slurry with a solid content of 40g / 100g after dispersion by ball milling, and coat it on a 400cpsi cordierite honeycomb carrier with a coating amount of 160g / L. After drying, it was calcined at 550°C for 1 hour, and the obtained monolithic catalyst was named Monolith-2. Cut out a cro...

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Abstract

The invention provides an impregnation-coating method for rapidly preparing a Cu-SSZ-13 monolithic catalyst. According to the method, mixing of a Cu salt precursor and an SSZ-13 molecular sieve is realized through impregnation; then slurry is prepared from the prepared mixture and coats the inner surface of a honeycomb carrier or in wall-flow type filter; and calcination in the air or in an oxygen-containing atmosphere is performed, and catalyst activation and adhesion of a catalyst coating are simultaneously achieved during the calcination. The method of the invention has the following advantages: (1) a preparation cycle is significantly shortened; (2) calcination frequency and calcination time are reduced; (3) wastewater discharge in the preparation process is drastically lowered; (4) the loading amount of Cu is accurately controlled; and (5) the prepared catalyst has high SCR catalytic activity. The Cu-SSZ-13 monolith catalyst prepared in the invention is applicable to the ammonia-process selective catalytic reduction denitration (NH3-SCR) of diesel exhaust gas.

Description

technical field [0001] The invention belongs to the technical field of preparation of denitrification catalysts, in particular to an impregnation-coating method for rapidly preparing Cu-SSZ-13 monolithic catalysts, and the prepared monolithic catalysts are mainly suitable for diesel engines (diesel vehicles, non-road construction machinery, agricultural Machinery, ships, small general machines, etc.) tail gas ammonia selective catalytic reduction denitrification (NH 3 -SCR). Background technique [0002] Diesel vehicles are one of the important culprits causing large-scale haze pollution in my country at this stage, because nitrogen oxides (NO x ) is the formation of PM 2.5 main precursor substances. According to the "China Motor Vehicle Environmental Management Annual Report (2018)" issued by the Ministry of Ecology and Environment, diesel vehicles, which account for only 9.4% of the total number of vehicles in my country, emit NO x Accounting for 68.3% of total vehicle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01J37/02B01D53/94B01D53/56
CPCB01D53/9413B01D2251/2062B01D2258/012B01J29/76B01J37/0201B01J37/0215B01J2229/18
Inventor 吴晓东马越曹丽刘丽萍冉锐司知蠢翁端
Owner TSINGHUA UNIV
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