| 摘要 |
The present invention provides the catalyst for high temperature decomposition of nitrous oxide in process gas mixture, for nitric acid plants, which is based on calcium aluminates. The catalyst according to the invention is composed of CaO from 25 to 49 % by weight and Al2O3 from 26 to 51% by weight and SiO2 up to 26% by weight, MgO up to 10% by weight, SrO - up to 32% by weight and BaO up to 12% by weight and exists in the form of active catalytically main phase in the minimum amount of 80% of the Mayenite structure CIF 62040-ICSD, described by the chemical formula as: Ca12-kXkAl14-nSinO33+(n/2), where k has numerical value from O to 6, and n has numerical value from O to 7, and X stands for the following chemical elements: magnesium or strontium or barium or the mixture of them, and the remaining phase having at least one of the auxiliaries components: Ca3AI2O6, CaAI2O4 and Ca2Al4O7, with the catalyst grains size 0.5 - 10 µm. |
