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Catalytic reduction of NOx with high activity catalysts with acetaldehyde reductant

A catalyst and reducing agent technology, applied in the direction of molecular sieve catalysts, physical/chemical process catalysts, metal/metal oxides/metal hydroxide catalysts, etc., can solve problems such as expensive operation, limited capacity or efficiency

Inactive Publication Date: 2015-04-15
EXXON RES & ENG CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, these known techniques may be expensive to operate and / or may have limited capacity or efficiency

Method used

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  • Catalytic reduction of NOx with high activity catalysts with acetaldehyde reductant
  • Catalytic reduction of NOx with high activity catalysts with acetaldehyde reductant
  • Catalytic reduction of NOx with high activity catalysts with acetaldehyde reductant

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Experimental program
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preparation example Construction

[0036] Similar to the preparation of the first catalyst, the potassium-loaded second catalyst can be prepared by infiltrating some potassium-containing salt solution into the zeolite. The potassium-modified zeolite was then calcined in air to obtain a potassium weight loading between 0.2% and 2%.

[0037] The desired operating temperature of the first catalytic reactor (and / or the second catalytic reactor, if present) can be achieved in a number of ways. Combustion operations, for example in refineries, often produce flue gases in the temperature range above 500°C. Accordingly, and in one embodiment, the operating temperature of the first catalytic reactor 230 can be maintained within a desired range or value by locating the first catalytic reactor 230 at a location downstream of the combustion operation 210 , where the effluent stream 220 is expected to have such a temperature range or value. For example, such a location may be downstream of combustion operation 210 where e...

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PUM

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Abstract

Methods and systems are provided for selective catalytic reduction of NOx with a low molecular low molecular weight aldehyde, e.g., acetaldehyde, as a reductant using a catalyst system including two catalysts. An exhaust stream containing an amount of NO from a combustion operation is provided. A portion of the exhaust stream is introduced to a first catalyst to convert the NO to NO2. The exhaust stream from the first catalyst with NO2 and a reductant stream containing a low molecular weight aldehyde, e.g., acetaldehyde, are introduced to the second catalyst to convert the NO2 to N2. The first catalyst can be bulk Co3O4, Ru or Pt loaded on alumina; the second catalyst can be various zeolites, or zeolites loaded with potassium.

Description

technical field [0001] The presently disclosed subject matter relates to methods and systems for removing polluting gases from exhaust streams formed by combustion processes, such as internal combustion engines, furnaces, power plants, and the like. In particular, the disclosed subject matter relates to the use of metal-loaded zeolite catalysts for the selective catalytic reduction of nitrogen oxides (NOx) from the exploration, production of petroleum, petrochemicals, or direct products thereof , Refining, manufacturing, supplying, transporting, preparing or blending exhaust gases directly or indirectly from combustion processes. Background technique [0002] Combustion plants in commercial applications, such as those in petroleum and petrochemical processing, including the exploration, production, refining, Manufacture, supply, transport, formulate or blend. Efforts have been made over the years to develop methods and systems for removing polluting gases from exhaust gase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/94B01J29/00
CPCB01D53/9431F01N3/10B01J29/7015B01J35/0006B01J29/703B01J23/42B01J23/462B01J29/7007B01J29/084B01J23/75B01J29/40B01J29/7034B01J29/7038B01J29/18B01D53/9413B01J29/70B01J29/7026B01J35/19
Inventor 阿吉特·B·丹德卡尔理查德·L·埃克斯理查德·F·索哈S·博·瓦尔德鲁普杰森·M·麦克马伦
Owner EXXON RES & ENG CO