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Tail gas treatment catalyst as well as preparation method and application thereof

A technology for exhaust gas treatment and catalyst, which is applied in catalyst activation/preparation, physical/chemical process catalyst, gas treatment, etc., and can solve problems such as ineffective purification

Active Publication Date: 2019-01-18
SINOCAT ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the inability of the existing tail gas treatment catalyst to effectively purify and treat the newly added by-product NH in the tail gas. 3 to provide a method that can effectively purify and treat hydrocarbons, carbon monoxide, nitrogen oxides, particulate matter and new by-product NH in the tail gas 3 Tail gas treatment catalyst, and preparation method and use of the tail gas treatment catalyst

Method used

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  • Tail gas treatment catalyst as well as preparation method and application thereof
  • Tail gas treatment catalyst as well as preparation method and application thereof
  • Tail gas treatment catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Palladium nitrate and rhodium nitrate solutions were loaded onto oxygen storage material (OSM) and alumina (Al 2 o 3 ), dry at 80°C for 6h, and bake at 500°C for 2h, wherein the palladium material is marked as M1-1, and the rhodium material is marked as M1-2;

[0099] Platinum nitrate solution was loaded onto alumina (Al 2 o 3 ), dry at 80°C for 6h, and bake at 500°C for 2h, denoted as M2-1;

[0100] The copper nitrate solution was loaded on SSZ-13 molecular sieve by ion exchange method, dried at 80°C for 6h, and calcined at 500°C for 2h, which was designated as M2-2;

[0101] Mix M1-1 with aluminum sol, ball mill for 10 minutes, and the binder accounts for 3%, to obtain slurry N1-1 with a solid content of 45%;

[0102] Mix M1-2 with aluminum sol, ball mill for 10 minutes, the binder accounts for 3%, and obtain slurry N1-2 with a solid content of 45%;

[0103] Mix M2-1 with aluminum sol, ball mill for 10 minutes, the binder accounts for 3%, and obtain slurry N2-1 w...

Embodiment 2

[0111] Apply N1-1 in Example 1 to the front 2 / 3 of the cordierite carrier, the size of the cordierite carrier is Φ25.4*76.2 / 400cpsi-4mil, dry at 80°C for 6h, and calcinate at 500°C for 2h to obtain the catalyst C3- 1, coating amount 120g / L, precious metal content 145g / ft 3 ;

[0112] Apply N1-2 in Example 1 to the upper layer of C3-1, dry at 80°C for 6h, and calcine at 500°C for 2h to obtain catalyst C3-2, the coating amount of the upper layer is 60g / L, and the precious metal content of the upper layer is 5g / ft 3 , the total coating amount of the front-end catalyst is 180g / L, and the total precious metal content is 150g / ft 3 ;

[0113] Apply N2-1 in Example 1 to the last 1 / 3 of the cordierite carrier, dry at 80°C for 6h, and calcine at 500°C for 2h to obtain catalyst C3-3 with a coating weight of 60g / L and a precious metal content of 3g / ft 3 ;

[0114] Apply N2-2 in Example 1 to the upper layer of C3-3, dry at 80°C for 6h, and bake at 500°C for 2h to obtain catalyst C3-4, ...

Embodiment 3

[0117] Apply N1-1 in Example 1 to the front 2 / 3 of the cordierite carrier, the size of the cordierite carrier is Φ25.4*76.2 / 400cpsi-4mil, dry at 80°C for 6h, and bake at 500°C for 2h to obtain the catalyst C4- 1, coating amount 120g / L, precious metal content 145g / ft 3 ;

[0118] Apply N1-2 in Example 1 to the upper layer of C4-1, dry at 80°C for 6h, and calcine at 500°C for 2h to obtain catalyst C4-2. 3 , the total coating amount of the front-end catalyst is 180g / L, and the total precious metal content is 150g / ft 3 ;

[0119] Apply N2-1 in Example 1 to the last 1 / 3 of the cordierite carrier, dry at 80°C for 6h, and calcine at 500°C for 2h to obtain catalyst C4-3 with a coating weight of 60g / L and a precious metal content of 3g / ft 3 ;

[0120] Apply N2-2 in Example 1 to the upper layer of C4-3, dry at 80°C for 6h, and bake at 500°C for 2h to obtain catalyst C4-4, with a coating amount of 150g / L and a total coating amount of the latter stage of 210g / L .

[0121] The cataly...

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Abstract

The invention discloses a tail gas treatment catalyst. The catalyst is prepared from a carrier, a first catalyst and a second catalyst, wherein the first catalyst and the second catalyst are arrangedat two ends of the carrier; the first catalyst can be used for purifying and treating pollutants in tail gas; the second catalyst can be used for carrying out purification treatment on a byproduct ammonia gas obtained by the purification treatment of the first catalyst, and part of pollutants which are not completely purified through the first catalyst; the second catalyst is of a double-layered structure and a lower layer is composed of an oxygen storage material, aluminum oxide and a second active component; the second active component is a composition of Pt and Pd or a composition of Ce, Fe, Ni and Cu; an upper layer is composed of a molecular sieve and a third active component; the third active component is Cu or a composition of Cu and Fe. The tail gas treatment catalyst provided by the invention is high in purification treatment efficiency; the emission of CH4, CO and NOx in the tail gas can be remarkably reduced; especially, the content of the byproduct NH3 is reduced and national grade-VI emission requirements can be met.

Description

technical field [0001] The invention relates to the technical field of tail gas treatment, in particular to a tail gas treatment catalyst and its preparation method and application. Background technique [0002] For heavy-duty natural gas vehicles from National V to National VI, the combustion method of the engine has been upgraded from lean combustion to equivalence ratio combustion. TWC). Under equivalent combustion conditions, TWC can remove HC (including CH 4 and NMHC), CO, and NO x converted to N 2 , CO 2 and H 2 O, but in this catalytic conversion process, the by-product NH 3 . [0003] GB17691-2018 "Heavy-duty Diesel Vehicle Pollutant Emission Limits and Measurement Methods (China Phase VI)", this standard is applicable to heavy-duty natural gas vehicles and heavy-duty diesel vehicles, and natural gas vehicles will implement this standard from July 1, 2019. Based on GB17691-2005, this standard further reduces gaseous pollutants CO, HC and NO x In addition to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46B01J29/76B01J29/85B01J37/02B01J37/30B01J37/08F23G7/06
CPCF23G7/06B01J29/46B01J29/7615B01J29/763B01J29/85B01J37/0018B01J37/0201B01J37/0215B01J37/082B01J37/30B01J2229/18B01D53/945B01D53/9472B01D53/9468B01D2255/1021B01D2255/1023B01D2255/1025B01D2255/2092B01D2255/908B01D2255/9022B01D2255/9032B01D2255/20761B01D2255/20738B01D2255/20753B01D2255/2065B01D2255/40Y02A50/20Y02T10/12B01J35/0006B01J29/743B01D53/9436B01D53/865B01D2258/0291B01J21/04B01J23/42B01J23/44B01J23/462
Inventor 王云淡宜程永香杜洪仪朱赞罗甜甜张艳华王勤李云陈启章
Owner SINOCAT ENVIRONMENTAL TECH
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