TEMPERATURE-PROGRAMMED DESORPTION OF OXYG EN AND OXIDATIVE ACTIVITY OF LA2-XSRXNIO4

TPD of oxygen and catalytic activity of oxidation of CO and oxidative coupling of methane on La2-xSrxNiO4 were studied. It was shown that tw o oxygen desorption peaks from two different temperature ranges were r elated to Ni2+ and Ni3+ ions in the crystal structure, respectively. T he uptake of O-2 desorbed at a lower temperature increased when the am ount of Ni2+ increased , while the uptake of O-2 desorbed at a higher temperature increased with the increase of Ni2+ content. The crystal o xygen took part in the reactions of CO oxidation and OCM directly.