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Ammonia oxidation catalyst for high-temperature tail gas and preparation method thereof

A catalyst and ammonia oxidation technology, applied in the field of automobile exhaust purification and environmental protection, to achieve the effects of stable ammonia oxidation catalyst performance, reducing pollutant emissions and improving catalytic performance

Pending Publication Date: 2020-05-19
SINOCAT ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome existing AOC under high temperature condition and NH 3 converted to NO x The proportion of defects is relatively large, providing an ammoxidation catalyst for high-temperature exhaust gas and a preparation method thereof; the ammoxidation catalyst loads different catalyst active components on different carrier materials and adjusts their distribution on the carrier , significantly improved the catalytic performance of the ammonia oxidation catalyst, enabling the ammonia oxidation catalyst to quickly and efficiently convert NH 3 converted to N 2 , thereby overcoming the problem that existing ammonia oxidation catalysts convert a large amount of NH 3 converted to NO x The defects of the high-temperature equivalent combustion engine exhaust gas have been purified, so that it can meet the national engine exhaust emission standards, which is conducive to the large-scale application of ammonia oxidation catalysts

Method used

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  • Ammonia oxidation catalyst for high-temperature tail gas and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Preparation of the first catalyst: La-Al 2 O 3 And Ce 0.5 Zr 0.5 O 2 According to the mass ratio of 1:1, mechanically mixed, stirred for 20 minutes, and mixed uniformly to obtain a mixed carrier material; after the platinum nitrate solution was loaded on the mixed carrier material by an equal volume immersion method, dried at 80 ℃ for 6 h, and baked at 500 ℃ for 2 h, to obtain the first catalyst;

[0032] Preparation of the second catalyst: exchange the copper acetate solution on the SSZ-13 molecular sieve by ion exchange, wash and dry, and calcinate at 450 ℃ for 2 h to obtain the second catalyst;

[0033] (2) Preparation of coating slurry: mix the first catalyst with aluminum sol (5%), ball mill for 10 min to obtain the first catalyst slurry with a solid content of 40%; combine the second catalyst with aluminum sol (proportion 3%) Mix and ball mill for 10 minutes to obtain a second catalyst slurry with a solid content of 45%;

[0034] (3) Preparation of ammonia oxidation...

Embodiment 2

[0036] (1) Preparation of the first catalyst: La-Al 2 O 3 And Ce 0.5 Zr 0.5 O 2 According to the mass ratio of 1:1, mechanically mixed, stirred for 20 minutes, and mixed uniformly to obtain a mixed carrier material; after the platinum nitrate solution was loaded on the mixed carrier material by an equal volume immersion method, dried at 80 ℃ for 6 h, and baked at 500 ℃ for 2 h, to obtain the first catalyst;

[0037] Preparation of the second catalyst: exchange the copper acetate solution on the SSZ-13 molecular sieve by ion exchange, wash and dry, and calcinate at 450 ℃ for 2 h to obtain the second catalyst;

[0038] (2) Preparation of coating slurry: After mixing the first catalyst and the second catalyst in a ratio of 1:1, then mixing with aluminum sol (3.5%), ball milling for 10 minutes, to obtain a mixed catalyst slurry;

[0039] (3) Preparation of ammonia oxidation catalyst: Coating mixed catalyst slurry (coating amount 240 g / L, precious metal content 5 g / ft 3 ,Transition metal ...

Embodiment 3

[0041] (1) Preparation of the first catalyst: After mixing platinum nitrate and palladium nitrate solution at a mass ratio of 5:1, load it to Ce by an equal volume impregnation method 0.1 Zr 0.2 Al 0.7 O 1.65 After the material is applied, it is dried at 80 ℃ for 6 h and calcined at 500 ℃ for 2 h to obtain the first catalyst;

[0042] Preparation of the second catalyst: the iron acetate solution was exchanged onto the Beta molecular sieve by ion exchange, washed and dried, and calcined at 450 ℃ for 2 h to obtain the second catalyst;

[0043] (2) Preparation of coating slurry: mix the first catalyst with aluminum sol (5%), ball mill for 10 min to obtain the first catalyst slurry with a solid content of 40%; combine the second catalyst with aluminum sol (proportion 3%) Mix and ball mill for 10 minutes to obtain the second catalyst slurry with 45% solid content;

[0044] (3) Preparation of ammonia oxidation catalyst: Coating the first catalyst slurry (coating amount 120 g / L, precious me...

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Abstract

The invention discloses an ammonia oxidation catalyst matched with a three-way catalyst for use and a preparation method thereof. Compared with a traditional diesel vehicle ammonia oxidation catalyst,the ammonia oxidation catalyst matched with the three-way catalyst for use is mainly used for a high-temperature tail gas atmosphere. According to the ammonia oxidation catalyst, different catalyst active components are loaded on different carrier materials, the distribution condition on the carrier is adjusted, the catalytic performance of the ammonia oxidation catalyst is obviously improved, the ammonia oxidation catalyst can rapidly and efficiently convert NH3 to N2 under a high-temperature condition, the defect that an existing ammonia oxidation catalyst converts a large amount of NH3 into NOx under the high-temperature oxygen-deficient condition is overcome, purification treatment of high-temperature equivalent combustion engine tail gas is achieved, the national engine tail gas emission standard can be met, and large-scale application of the ammonia oxidation catalyst is facilitated.

Description

Technical field [0001] The invention relates to the field of environmental protection, in particular to the field of automobile exhaust purification, in particular to an ammonia oxidation catalyst suitable for high-temperature (≥450°C) equivalent combustion engine exhaust and a preparation method thereof. The catalyst of the present invention is usually installed at the back end of the three-way catalyst and used in conjunction with the three-way catalyst to mainly purify the by-product NH of the three-way catalyst. 3 . Background technique [0002] There are two reaction products in the main reaction of Three Way Catalyst (TWC) for purifying automobile exhaust gas. 2 , Respectively, CO and H 2 O reacts to form CO 2 And H 2 , And HC (Hydro-Carbon) and H 2 O reacts to form CO and H 2 ; On TWC, H 2 Main and O 2 , NO x Reaction to generate H 2 O, but also with NO x , CO and NO x Reaction to generate NH 3 ; Therefore, the H generated on TWC 2 And H in the exhaust 2 Will bring new by-p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01J37/30B01J37/02B01D53/94B01D53/86B01D53/58
CPCB01J29/7615B01J29/763B01J37/30B01J37/0215B01J37/0201B01D53/9436B01J2229/186B01D2258/012B01D53/9445Y02A50/20
Inventor 王云程永香张艳华徐海迪王勤张志风淡宜陈耀强李云陈启章
Owner SINOCAT ENVIRONMENTAL TECH