Catalyst gauze and installation for the catalytic oxidation of ammonia

A catalytic net, ammonia oxidation technology, applied in the direction of heterogeneous catalyst chemical elements, nitric oxide, chemical instruments and methods, etc., can solve the problems of poor flow distribution, ammonia slip, failure and so on

Inactive Publication Date: 2017-09-26
尤米科尔股份两合公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Any negative effect of non-uniform distribution will lead to an overall disproportionation effect, since local deviations from the mean value (e.g. higher than average local pressure drop or local temperature) form critical points for accelerating further deviations, which can lead to catastrophic failures, e.g. due to Ammonia slip occurs due to preferential flow at a certain point in the network resulting in poor flow distribution

Method used

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  • Catalyst gauze and installation for the catalytic oxidation of ammonia
  • Catalyst gauze and installation for the catalytic oxidation of ammonia
  • Catalyst gauze and installation for the catalytic oxidation of ammonia

Examples

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Embodiment Construction

[0034] The catalytic net 1 in the accompanying drawings is mainly composed of two layers, more specifically, a first layer 2 and a second layer 3, both of which are knitted.

[0035] The first layer 2 is made of a first mesh 4, which in this example, but not necessarily, has a diameter of 0.076 mm and is composed of 81.5% by weight Pd, 15% by weight Pt and 3.5% by weight Made of alloys composed of Rh. In this example, but not necessarily, the second layer 3 is made of the same mesh material as the first layer 2 .

[0036] The first layer 2 and the second layer 3 have a thickness d of about 0.55mm and are placed at a distance D of about 1.4mm, forming an overall thickness D+2d of 2.5mm.

[0037] Between the stitches of the knitted mesh 4 of the first layer 2 and the second layer 3 , pile yarns 5 are arranged, which shuttle back and forth between the first layer 2 and the second layer 3 . The pile yarn 5 is made of a second mesh, which in this example, but not necessarily, has...

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Abstract

Catalyst gauze (1) for the reduction of the amount of N2O in an ammonia oxidation process, containing a first layer (2) of woven or knitted first wire material (4), whereby said first wire material (4) is made from Pd or a Pd-rich alloy, whereby said first layer (2) contains a reinforcement in the form of a second wire material (5) which is woven or knitted among the first wire material (4) and which has a different composition than the first wire material (5).

Description

technical field [0001] The present invention relates to catalytic meshes and devices for the catalytic oxidation of ammonia. Background technique [0002] The oxidation of ammonia to NO (intermediate step in nitric acid production) is usually carried out in a reactor with a catalytic mesh. These catalytic meshes are usually woven or knitted meshes made of platinum or alloys of platinum together with other noble metals as minor components. [0003] During this process, N 2 O is produced as an undesired by-product. N 2 O is considered a very potent greenhouse gas, thus limiting N during the oxidation of ammonia 2 The generation of O is very important. [0004] It is known from WO01 / 87771 that the use of catalytic meshes made of Pd or Pd-rich meshes downstream of conventional Pt-based catalytic meshes can reduce the N produced 2 The amount of O. This may be through N 2 The dissociation of O molecules comes into play. [0005] However, this Pd-based catalytic network is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/24C01B21/26
CPCB01J19/2495C01B21/267B01J2219/30261B01J2219/30475B01J35/06B01J23/40B01J2523/00B01J23/44D04B1/14D10B2101/20D10B2403/0242D10B2403/021B01J2523/822B01J2523/824B01J2523/828B01D53/86B01J23/38B01J23/42B01J23/464B01J2219/30257
Inventor 迪尔克·博尔迪特马尔·柯尼希斯克里斯蒂安·格伦斯
Owner 尤米科尔股份两合公司
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