Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for reducing the nitrogen oxide concentration in gases

A technology of gas and content, applied in the direction of chemical instruments and methods, gas treatment, separation methods, etc., to achieve the effect of high removal rate

Inactive Publication Date: 2008-05-07
UHDE GMBH
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage is that a correspondingly large amount of reducing agent is required to eliminate nitrogen oxides, especially N 2 O content

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0071] The method of the present invention is illustrated by the following examples.

[0072] The catalyst used was ZSM-5 zeolite loaded with iron. The Fe-ZSM-5 catalyst was prepared by solid-state ion exchange from a commercially available ammonium form of zeolite (ALSI-PENTA, SM27). Detailed information on this preparation can be found in: M. Rauscher, K. Kesore, R. Mnnig, W. Schwieger, A. Tiβler, T. Turek: "Preparation of highly active Fe-ZSM-5 catalyst through solid state ionexchange for the catalytic decomposition of N 2 O” (prepared by solid-state ion exchange for catalytic decomposition of N 2 Highly active Fe-ZSM-5 catalysts for O), Appl. Catal. 184 (1999) 249-256.

[0073] The catalyst powder was calcined at 823K in air for 6 hours, washed and dried at 383K overnight. After adding a suitable binder, they are extruded to obtain cylindrical shaped catalyst bodies.

[0074] In Examples 1 and 3, as for reducing NO x and N 2 The plant for the O content uses two tub...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

According to the inventive method, a gas containing N2O and NOx is conducted across a series of two catalyst beds, and reducing agent for NOx and N2O is added between the catalyst beds at an amount that causes a predetermined percentage of N2O to be reduced in addition to NOx. The reaction conditions are adjusted such that the N2O concentration of the gas is decomposed by a maximum of 95 percent relative to the N2O concentration at the inlet of the first catalyst bed by being broken down into nitrogen and oxygen while the N2O is chemically reduced in addition to the NOx in the second catalyst bed such that the N2O concentration of the gas is reduced by a minimum of 50 percent relative to the N2O concentration at the inlet of the second catalyst bed.

Description

technical field [0001] The invention relates to a method for reducing the content of nitrogen oxides in gas. Background technique [0002] In many processes, such as combustion processes, or in the industrial production of nitric acid, nitrogen monoxide NO, nitrogen dioxide NO 2 (collectively referred to as NO x ) and nitrous oxide N 2 O exhaust. NO and NO 2 and N 2 O is known as a compound with ecotoxicity concerns (acid rain, smog formation, decomposition of stratospheric ozone). For reasons of environmental protection there is an urgent need to be able to eliminate nitrous oxide emissions together with NO x Technical solutions for emissions. [0003] except N 2 O for one hand and NO x In addition to individual elimination on the other hand, combined methods for the elimination of these nitrogen oxides have also been proposed. [0004] WO-A-00 / 48715 discloses a method in which NO x and N 2 The exhaust gas of O is passed over the beta-type iron zeolite catalyst ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01D53/86
CPCB01D2257/404B01D2251/2062B01D2255/50Y02C20/10B01D53/8628B01D2251/204B01D2255/20738B01D2251/202B01D2257/402B01D2251/208B01D53/56B01D53/94
Inventor M·施韦弗R·西费特M·格罗沃斯
Owner UHDE GMBH