Thermal decomposition of supported lithium nitrate catalysts.

MARÍA LUCÍA RUIZ; ILEANA D. LICK; MARTA I. PONZI; ENRIQUE RODRIGUEZ CASTELLÓN; ANTONIO JIMENEZ LOPEZ; ESTHER N. PONZI

THERMOCHIMICA ACTA

Elsevier

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 and ZrO2.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 activity of a series of impregnated catalysts prepared using LiOH (Li2O/supports). Catalysts prepared using LiNO3 are found to be more active than those prepared using LiOH. The catalytic performance was also studied with a NO/O2 mixture in the feed, demonstrating that NO increases the combustion rate of soot, probably as a consequence of lithium oxide forming an “in situ” nitrate ion.