Composition containing lanthanum-perovskite on a substrate of aluminum or aluminum oxyhydroxide, METHOD FOR PRODUCING AND USE IN CATALYSIS

摘要

1. A composition comprising a perovskite of the formula LaMO, wherein M represents at least one element selected from iron, aluminum or manganese in the form of particles dispersed on a support based on aluminum oxide or oxyhydroxide, aluminum, characterized in that after calcination at 700 ° C for 4 hours perovskite is a crystallographically pure phase and perovskite particles have a size of not more than 15 nm.2. A composition according to claim 1, characterized in that the particles have a size of not more than 10 nm.3. A composition according to claim 1 or 2, characterized in that the amount of the perovskite in the composition is from 5% to 30%, more particularly from 10% to 20% by masse.4. A composition according to claim 1 or 2, characterized in that the perovskite of at least one element of La and M is partially substituted by at least one substitute elementom.5. A composition according to claim 4, characterized in that the replacement element selected from La and rare-earth elements calcium and substituting element M selected from cobalt or strontsiya.6. A composition according to claim 1 or 2, characterized in that the perovskite has a deficiency of elements or La M.7. A composition according to claim 1 or 2, characterized in that after calcination at 900 ° C for 4 hours perovskite particles have a size of not more than 18 nm, more particularly not more than 15 nm.8. A composition according to claim 1 or 2, characterized in that after calcination at 1000 ° C for 4 hours perovskite particles have a size of not more than 22 nm.9. A composition according to claim 7, characterized in that the perovskite is crystallographically pure fazoy.10. A composition according to claim 8, characterized in that the perovskite is crystallographically pure fazoy.11. A composition according to claim 1 or 2, characterized in that alumina or aluminum oxyhydroxide stabilized substrate