Catalytic decomposition of high-concentration nitrous oxide N_2O

摘要

High-concentration N_2O has been decomposed catalytically with four metal oxide systems which contain s, p, d-block elements. In all cases, the decomposition reaction can be treated as first order with respect to partial pressure of N_2O, considering that decomposition product O_2 exhibits no or little inhibition effect on the reaction. Optimal preparation conditions for the catalysts have been explored. In particular, chemical interaction between surface metals and carriers has been investigated. The catalysts have been characterized by various analytical techniques and general material issues have also been addressed. Among the four systems studied, Ru/Al_2O_3 and Mg-Co mixed oxides give best catalytic performance. For example, approximately 6 moles of N_2O per kg of the hydroxide/hydrotalcite can be decomposed at 350 deg C within an hour.