Thermal decomposition of supported lithium nitrate catalysts

MARIA LUCIA RUIZ; ILEANA DANIELA LICK; MARTA ISABEL PONZI; ENRIQUE RODRÍGUEZ CASTELLÓN; ANTONIO JIMÉNEZ LÓPEZ; ESTHER NATALIA PONZI

THERMOCHIMICA ACTA

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2009 vol. 499 p. 21 - 26

0040-6031

New catalysts for soot combustion were prepared by impregnation of different supports (SiO2, ZrO2 andZrO2·nH2O) with a LiNO3 solution and then characterized by means of FTIR, XPS, TGA and UV?vis spectroscopy,whereby the presence of lithium nitrate in the prepared catalysts was identified and quantified.The soot combustion rate using this series of catalysts (LiNO3/support) was compared with the activityof a series of impregnated catalysts prepared using LiOH (Li2O/supports). Catalysts prepared using LiNO3are found to be more active than those prepared using LiOH. The catalytic performance was also studiedwith a NO/O2 mixture in the feed, demonstrating that NO increases the combustion rate of soot, probablyas a consequence of lithium oxide forming an ?in situ? nitrate ion.