Catalyst gauze and installation for the catalytic oxidation of ammonia

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...

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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

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