Novel metal-containing zeolite beta for NOx reduction and methods of making the same

A technology containing metal and zeolite, applied in the directions of non-metallic elements, crystalline aluminosilicate zeolite, separation method, etc., can solve the problems of undisclosed zeolite and the like

Active Publication Date: 2013-03-13
ECOVYST CATALYST TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of these references disclose a process for the preparation of metal-containing zeolite beta as claimed

Method used

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  • Novel metal-containing zeolite beta for NOx reduction and methods of making the same
  • Novel metal-containing zeolite beta for NOx reduction and methods of making the same
  • Novel metal-containing zeolite beta for NOx reduction and methods of making the same

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preparation example Construction

[0055] In addition to the preparation method of the present invention and the zeolite beta of the present invention, methods of using the disclosed zeolite beta of the present invention are also disclosed. For example, a typical diesel engine exhaust contains about 2-15 vol% oxygen and about 20-500 parts per million nitrogen oxides (typically including NO and NO 2 mixture). Nitrogen oxides are reduced with ammonia to form nitrogen and H 2 O can be catalyzed by metal-promoted zeolites, so the process is often referred to as "selective" catalytic reduction ("SCR") of nitrogen oxides.

[0056] Accordingly, a method for selective catalytic reduction of nitrogen oxides in exhaust gas is also disclosed. In one embodiment, the method comprises:

[0057] Exhaust gases are at least partially contacted with an article comprising a metal-containing zeolite beta having a SAR of 5-20, wherein the zeolite beta does not require an organic structure directing agent (SDA) to be prepared and...

Embodiment 1

[0068] Example 1: Synthesis of organic-free β (SAR=10.3) and subsequent Fe exchange to produce Fe-β (4.0 wt% Fe, SAR=10.3)

[0069] Water, NaOH (50%) and sodium aluminate (23.5% Al 2 o 3 , 19.6% Na 2 O) mixed together. Silica gel (PQ Corporation) was added to the solution and mixed vigorously for 1 hour. Finally, commercially available zeolite beta (Zeolyst International) was added to the mixture in an amount of 5% by weight relative to the silica content of the slurry and stirred for 30 minutes. The gel has the following molar composition:

[0070]15.0 SiO 2 :1.0Al 2 o 3 :3.8Na 2 O:259H 2 o

[0071] The gel was loaded into 45-mL Parr cartridges and heated to 125°C for 120 hours under static conditions. After cooling, the product is recovered by filtration and washing. The X-ray diffraction pattern of the product shows a pure phase of zeolite beta.

[0072] To remove residual sodium, dissolve the solid in 3.6M NH 4 NO 3 The solution was slurried and stirred at 9...

Embodiment 2

[0075] Example 2. (comparative): Fe-β by aqueous ion exchange (1.0 wt% Fe, SAR=25)

[0076] Commercial zeolite beta (CP814E, SAR=25) from Zeolyst was mixed with FeCl at 80 °C 2 The solution was ion exchanged for 2 hours. After filtering, washing and drying, the Fe-β product has 1.0wt% Fe, 693m 2 / g BET surface area and 0.19cc / g micropore volume.

[0077] After steaming at 700°C for 16h in 10% steam / air, the material has a surface area of ​​590m 2 / g and the micropore volume is 0.16cc / g.

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Abstract

There is disclosed an organic-free, metal-containing zeolite Beta with a silica-to-alumina ratio (SAR) ranging from 5 and 20, and a metal content of at least 0.5 wt.%. There is also disclosed a method of making such a zeolite beta without organic structure directing agent (SDA). The metal, which may comprise Fe or Cu, can be found in amounts ranging from 1-10 wt.%. A method of selective catalytic reduction of nitrogen oxides in exhaust gases using the disclosed zeolite is also disclosed.

Description

[0001] This application claims the benefit of national priority of US Provisional Patent Application No. 61 / 347,210, filed May 21, 2010, which is hereby incorporated by reference in its entirety. technical field [0002] The present disclosure relates to a metal-containing zeolite beta and a method for its preparation. The present disclosure also relates to methods of using the zeolites, including for nitrogen oxides (NO x ) for selective catalytic reduction (SCR). Background technique [0003] Nitrogen oxides (NO x ) have long been known as polluting gases, mainly due to their corrosive action. In fact, they are the main cause of acid rain. NO x The major contributors to pollution are their emissions in the exhaust of diesel vehicles and stationary sources such as coal-fired power stations and turbines. To avoid these harmful emissions, SCR is used and includes the use of zeolite catalysts to reduce NO x into nitrogen and water. [0004] The following patents disclos...

Claims

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Application Information

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IPC IPC(8): B01D53/94B01J29/76
CPCC01B39/46B01D2251/2062B01J29/7615B01J2229/18B01D2255/20738B01D2255/502B01D2255/20761B01D53/9418C01B39/02
Inventor 黎鸿昕W·E·克米尔B·穆登
Owner ECOVYST CATALYST TECH LLC
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