Depicting the Nitric Oxide (NO) Chemical Sorption in Lithium Cuprate (Li2CuO2), through Thermokinetic and Spectroscopic Analyses

The chemisorption of NO on lithium cuprate (Li2CuO2) was studied through different techniques, including thermogravimetric and DRIFTS analyses. An initial dynamic thermogravimetric approach depicted similar efficiencies under the absence or presence oxygen (13.5 and 13.8 wt %). However, the NO capture temperature was shifted to higher values in the presence of oxygen. Moreover, the analysis of the outgoing gases showed the evolution of different nitrogen species, explained based on the Li2CuO2 reactivity, solid decompositions, and oxygen content. Then, the isothermal results showed that NO capture was improved with oxygen. Isothermal solid products were characterized, and lithium nitrate and nitrite were identified. Furthermore, a kinetic analysis was performed using two different models, showing that the presence of oxygen significantly modifies the NO sorption process. Moreover, the melting processes of lithium nitrate and nitrite enhanced the whole sorption process in the presence of oxygen; meanwhile, the oxygen absence limits the NO chemisorption.