What question did this study set out to answer?

This investigation aims to evaluate sodium metazirconate as a feasible NO chemical sorbent and determine its catalytic properties in selective catalytic reduction processes.

March 25, 2026Open Access

Analysis of sodium metazirconate as new NO feasible sorbent and early discernments as bifunctional material in the selective catalytic reduction (SCR) process

Puntos clave

This investigation aims to evaluate sodium metazirconate as a feasible NO chemical sorbent and determine its catalytic properties in selective catalytic reduction processes.
Synthesis and analysis of sodium and lithium metazirconates as NO sorbents.
Thermogravimetric measurements to quantify NO sorption under varied conditions.
Characterization of products using XRD and ATR-FTIR to confirm nitrate formation.
Kinetic analysis using the Avrami-Erofeev model to assess sorption dynamics.
Na2ZrO3 achieved a maximum NO sorption efficiency of 77.0% at 200 °C after 12.5 hours.
Li2ZrO3 exhibited negligible NO sorption capacity.
Kinetic analysis indicated that sorption slows as temperature increases and NO concentration decreases.
Catalytic properties of Na2ZrO3 were evidenced by the formation of N2O and CO2 during reduction processes.

Resumen

Many catalytic processes to prevent nitrogen oxides (NOx) pollution are made by complex material mixtures of noble catalytic metals and barium oxide (BaO). In this investigation, new materials such as sodium (Na2ZrO3) and lithium (Li2ZrO3) metazirconates were synthetized and analyzed to have feasible NO chemical sorbent materials, as well as during storage and reduction (CO-NSR) processes. Initially, thermogravimetric measurements were used to analyze NO chemical sorption in presence or absence of oxygen. After NO sorption experiments, products were reanalyzed by XRD and ATR-FTIR to confirm nitrates formation. Moreover, a reaction path was proposed, for the formation of lithium and sodium nitrates, supported by a theoretical analysis and verified through experimental analyses of gaseous products. The best NO sorption results were obtained by using Na2ZrO3 from 50.0 to 200.0 °C after a dehydroxylation step and large exposure times (77.0% efficiency at 200.0 °C during 12.5 h). In comparison, NO sorption by Li2ZrO3 was negligible. In addition, a kinetic analysis was performed using the Avrami-Erofeev model, showing that surface-controlled stage became slower as temperature increased and NO concentration diminished. Additionally, thermogravimetric analysis was used to study NO selective catalytic reduction (SCR) process, using CO as reducing agent. Gaseous products were analyzed by FTIR, evidencing catalytic properties of Na2ZrO3 through the formation of N2O and CO2.

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