Selective catalytic reduction catalyst

A selectivity and catalyst technology, applied in physical/chemical process catalysts, molecular sieve catalysts, catalyst activation/preparation, etc.

Active Publication Date: 2015-04-15
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SCR technology in the diesel engine NO x Effective in reducing emissions to leve...

Method used

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Examples

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Effect test

example 1

[0074] Interestingly, referring to figure 1 , by replacing a part of Cu / CHA with Cu / β, the ammonia storage capacity of the SCR system is reduced. refer to figure 1 , will be at 200°C and 30,000 h -1 NO x The conversion of is plotted as a function of the amount of ammonia stored on the catalyst in g / L. The line for conversion terminates at the point where ammonia slips through the system. The Cu / β sample itself is conversion limited and starts leaking very early. The Cu / CHA sample had the highest storage capacity and achieved the highest NO x conversion rate and leaked at the latest. Combining Cu / β with Cu / CHA reduces the ammonia storage capacity of the system and limits NO at this very low temperature x transforming ability. Without being bound by any theory, it is believed that the combination of Cu / CHA in layered form with Cu / β improves the NO x Conversion rates. The Cu / β catalyst alone stored about 0.14 g / L of NH 3 has ammonia slip at low levels of , and has a lo...

example 2

[0076] The next part of the improvement is NO at filter regeneration conditions (>500°C) x conversion rate. refer to figure 2 , experimented with different amounts of Cu / β and Cu / CHA in the system. Data were collected under steady state conditions utilizing a space velocity of 30000 / h of a flowing gas containing 14% oxygen, 5% water, 5% carbon dioxide, 350ppm NO, 350ppm NH 3 , the balance being nitrogen. Under similar conditions at 800°C (no NO x and NH 3 ) under hydrothermal aging of the catalyst for a total of 80 h. The aging is considered to represent 150,000 miles. Data shown with diamonds are for all Cu / CHA systems. High NO at 200-400°C is ideal for most driving conditions x The operating window for the conversion rate. Data shown as squares are for all Cu / β regimes. For the entire operating window, very poor conversion rates were obtained. However, the NO at 650°C x The conversion rate of is better than that of Cu / CHA sample. Replacing 1 / 4 of Cu / CHA with Cu...

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Abstract

A selective catalytic reduction (SCR) catalyst includes a support layer. A copper-loaded chabazite (Cu/CHA) layer is supported on the support layer. A copper-loaded beta zeolite (Cu/beta) is supported on the Cu/CHA layer. The Cu/beta may be hydrothermally pre-aged prior to use of the SCR catalyst in a vehicle. The pre-aged Cu/beta is essentially free of phosphorous (P), calcium (Ca), zinc (Zn), sodium (Na), potassium (K), magnesium (Mg), iron (Fe), CaSO4, Ca19Zn2(PO4)14, CaZn2(PO4)2, ash, and/or soot.

Description

technical field [0001] One aspect of the present invention relates to an SCR catalyst, and in particular, to a supported layer having a layer of copper-loaded zeolite beta and a layer of copper-loaded chabazite. Background technique [0002] Vehicle exhaust emissions of regulatory concern include oxides of nitrogen. Nitrogen oxides include, but are not limited to, nitric oxide (NO) and nitrogen dioxide (NO 2 ). These compounds are usually referred to as NO x . The reduction of NO by nitrogen compounds such as ammonia or urea has been developed for various industrial applications x selective catalytic reduction (SCR) system. The application of SCRs for mobile diesel engines needs to overcome several issues, including but not limited to NO x reduction, NO over a wide temperature range x conversion, ammonia storage and ammonia leakage. Ammonia emissions from SCR systems are known as ammonia slip. Ammonia leakage at higher NH 3 / NO x increase over time. SCR technolog...

Claims

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Application Information

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IPC IPC(8): B01J29/80B01D53/56B01D53/94
CPCB01J29/80F01N3/2066B01J29/7615B01J29/763B01D53/9418B01D2255/20761B01D2255/50B01D2255/502B01D2255/9022B01D2255/9032Y02A50/20Y02T10/12B01J35/04B01J37/0246B01J37/0244B01J35/0006B01D2255/904B01D53/8628
Inventor 克里斯汀·凯·兰伯特贾斯汀·安东尼·尤拉吉奥瓦尼·卡维塔欧
Owner FORD GLOBAL TECH LLC
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