Selective catalytic reductant and preparation method thereof

A catalyst and selective technology, applied in the field of removing NOx formed by any other combustion process in the industry, and selective catalytic reduction of NOx, it can solve the problems of low performance, low conversion rate, inactivity, etc., and achieve increased hydrothermal stability. , the effect of high NOx reduction characteristics

Inactive Publication Date: 2011-04-27
FORD GLOBAL TECH LLC
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Problems solved by technology

On the other hand, they have the following disadvantages: due to the high rate of ammonia oxidation and higher levels of N 2 O products have lower conversions at high temperatures above 400 °C
Copper / zeolite catalysts are active at low temperatures, but are less performant and produce more N at high temperatures 2 O emissions, while iron / zeolite SCR catalysts are inactive at low temperatures and have high ammonia slip

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  • Selective catalytic reductant and preparation method thereof
  • Selective catalytic reductant and preparation method thereof
  • Selective catalytic reductant and preparation method thereof

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Embodiment Construction

[0069] Commercial SCR catalysts known to react NOx with ammonia (based on copper / zeolite or iron / zeolite, where the zeolite is ZSM5) have different activities and are able to efficiently convert NOx to nitrogen only within a restricted temperature range. Their general properties are shown in figure 1 , using only NO (nitrogen monoxide) as the NOx source and NH 3 / NO ratio α = 1.2, using a small excess of ammonia. The data obtained represent typical characteristics of copper (copper / zeolite, ref 1) and iron (iron / zeolite, ref 2) of current commercial technology. as from figure 1 It can be seen that the performance of copper-SCR is good in the low temperature range starting from 175-200 °C, even using only NO without adding NO 2 Allowing for a NOx conversion close to 70% at 200°C. Copper-SCR catalysts have excellent levels of NOx conversion (which approach 100% NOx reduction) in the moderate temperature range of 200-400°C, but NOx conversion decreases at temperatures above...

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Abstract

The present invention relates to a selective catalytic reductant and the preparation method thereof. The present invention describes a method of preparation and/or modification of Cu/zeolite catalysts designed for the selective catalytic reduction (SCR) of nitrogen oxides with ammonia, including commercial catalysts. The method is comprising a removal of extra-lattice (extra-framework) aluminum species together with copper ions using citrate solution and a following re-insertion of copper or insertion of Cu/M ions, where M = Mg, Ca, Sr, La, Pr, B, Zr or Mg-Fe or Mg-Ce, using ion-exchange and/ or impregnation. The modified catalyst has improved and high NOx reduction properties at temperatures 170-600 DEG C and excellent hydrothermal stability up to 900 DEG C.

Description

technical field [0001] The present invention relates generally to removal of nitrogen oxides (NOx), and more particularly to selective catalytic reduction (SCR) of NOx from exhaust streams using ammonia as a reductant. The present invention further relates to obtaining SCR catalysts with improved catalytic activity over a broad temperature range, and to catalyst preparation for NOx removal or reduction, with reduced unreacted ammonia emissions (i.e. ammonia slip) and reduced by-products such as Nitrous oxide (N 2 O) method. [0002] The present invention relates in particular to a process for reducing NOx from oxygen-containing exhaust gas from an internal combustion engine (ICE), especially a diesel engine, and may also relate to 3 ) NOx catalytic reduction process for the removal of NOx formed by any other combustion process in industry, such as in stationary engines. Background technique [0003] Nitrogen oxides (NOx) are generally considered to be responsible for the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/06B01J29/46B01D53/94B01D53/56F01N3/28
CPCB01D2255/2047B01D2255/2066B01J2229/186B01D2255/20761B01D53/9418B01D2255/204B01J2229/37B01J29/072B01D2255/20715B01D2255/2063B01D2255/209B01D2255/40B01D2255/2045B01J29/46B01J37/06
Inventor R·乌克罗派克A·奇戈普维A·杜布科夫M·巴莱诺维奇M·赖歇特B·卡伯里
Owner FORD GLOBAL TECH LLC
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