Method for the decomposition of N
View Patent ↗A catalyst for the decomposition of N 2 O under the conditions of the Ostwald process, comprising a carrier and a coating made of rhodium, rhodium/palladium or rhodium oxide applied thereto, ensures to yield NO with a particularly low content of laughing gas as the first process product.
1. A method for the decomposition of N 2 O under the conditions in which it is formed in the Ostwald process, which comprises contacting said N 2 O with a catalyst comprising
A) a carrier material selected from the group consisting of alpha-Al 2 O 3 , ZrO 2 and CeO 2 , and
B) a coating made of a Pd-Rh alloy wherein the content of Pd in the Pd-Rh alloy is >0 to 95%.
2. Method according to claim 1 , wherein the decomposition takes place at 750 to 1000° C. and at 0.9 to 15 bar.
3. Method according to claim 1 , wherein the content of Pd in the Pd-Rh alloy is 30 to 70%.
4. Method according to claim 1 , wherein said catalyst is a fixed-bed catalyst.
5. Method according to claim 1 , wherein said catalyst is in the form of pellets, Raschig rings, foam or honeycomb structures.
6. Method according to claim 1 , wherein the carrier is alpha-Al 2 O 3 .
7. Apparatus for the decomposition of N 2 O formed in the Ostwald process, comprising at least one catalyst comprising
A) a carrier material selected from the group consisting of alpha-Al 2 O 3 , ZrO 2 and CeO 2 , and
B) a coating made of a Pd-Rh alloy wherein the content of Pd in the Pd-Rh alloy is >0 to 95% disposed downstream of the catalyst gauzes used to achieve NH 3 oxidation in said process.