Abstract: This invention relates to a non-medical food additive that is an animal growth promoter containing 99% pure zeolite partially or totally exchanged with a Cm+ cation (in other words a synthetic zeolite) with the general formula I below: 1 m ? yC m + ? ( 1 - y ) ? 1 n ? M n + ? AlO 2 ? x ? SiO 2 in which x is greater than 1 and advantageously between 1 and 15; Mn+ represents an alkaline or alkaline earth exchangeable ion, advantageously Na+, K+, Ca2+ or Li+; n is between 1 and 2; y is the exchange rate and is between 0.001 and 1; Cm+ is a metallic cation chosen from among copper Cu2+, silver Ag+ or zinc Zn2+; m is between 1 and 2. It also relates to an additive premix and a supplemented food containing it and a method of improving the growth of animals.

Abstract: A method for decomposing N2O is described. The method uses, as a catalyst, an oxide based on cerium and lanthanum, which further includes at least one oxide of an element chosen from zirconium and rare earths other than cerium and lanthanum. This catalyst is stable, enabling it to be used at high temperatures.

Abstract: This invention relates to a non-medicinal food additive that is an animal growth promoter containing 99% pure zeolite partially or totally exchanged with a Cm+ cation, i.e., a synthetic zeolite, having the general formula I below: 1 m ? yC m + ? ( 1 - y ) ? 1 n ? M n + ? AlO 2 ? xSiO 2 in which x is greater than 1 and advantageously between 1 and 15; Mn+ represents an alkaline or alkaline earth exchangeable ion, advantageously Na+, K+, Ca2+ or Li+; n is between 1 and 2; y is the exchange rate and is between 0.001 and 1; Cm+ is a metallic cation chosen from among copper Cu2+, silver Ag+ or zinc Zn2+; m is between 1 and 2; this invention also relates to an additive premix and a supplemented food containing same and a method of improving the growth of animals.

Abstract: A catalyst for reducing the nitrous oxide content in gas, which operates at relatively low temperatures, the activity of which is relatively insensitive to the presence of water vapor and which is highly resistant to hydrothermal degradation, is prepared from ferrierite exchanged with iron. Application to the treatment of gases with a low N2O content, such as gases resulting from plants for the manufacture of nitric acid, and of gases with a high N2O content, which are emitted during oxidations of organic compounds by nitric acid.

Abstract: A process and catalyst for reducing the nitrous oxide content in gas, which operates at relatively low temperatures, the activity of which is relatively insensitive to the presence of water vapour and which is highly resistant to hydrothermal degradation, is prepared from ferrierite exchanged with iron. Application to the treatment of gases with a low N2O content, such as gases resulting from plants for the manufacture of nitric acid, and of gases with a high N2O content, which are emitted during oxidations of organic compounds by nitric acid.