Process for the manufacture of nitric oxide
AssigneeJohnson Matthey Public Limited Company
InventorJack R. Handley
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Abstract
A process for the manufacture of nitric oxide by the oxidation of ammonia using a catalyst (1) comprising platinum in which the ammonia conversion efficiency of the process is improved by the use of a palladium catchment trap (2) in which the conventional layers (8 and 10) of palladium scavenger-wire are adjacent to layers (7, 9 and 11) of interstitial (preferably woven) ceramics material. The preferred ceramics material consists of alumina, silica and boria. Also a catchment trap comprising layers of ceramics material for use in the process.
Claims17
A process for the manufacture of nitric oxide by oxidising ammonia in the presence of a catalyst comprising platinum and from 0 to 20 wt % of rhodium and from 0 to 40 wt % of palladium (based on the weight of alloy), the catalyst being located upstream from a palladium catchment trap for scavenging platinum or rhodium lost from the catalyst by volatilisation wherein the catchment trap comprises at least one interstitial layer of elongated elements made from palladium or an alloy of palladium adjacent at least one layer of interstitial ceramics material.
A catchment trap for use in the manufacture of nitric oxide by oxidising ammonia in the presence of a platinum-based catalyst wherein the catchment trap comprises at least one interstitial layer of elongated elements made from palladium or an alloy of palladium supported on at least one layer of interstitial ceramics material.
Dependencies are inferred from the claim text.