Studies on combustion catalytic activity of some pure and doped lanthanum cobaltites

Synthesis of La1−xSrxMO3 (M=Mn, Fe, Co, Ni) nanopowders by alanine-combustion technique

“…Lanthanum-based perovskites have different specific surface area values depending on the transition metal; pure and Srdoped lanthanum cobaltite samples have the highest values 7 and have showed good catalytic activities. 13 Generally, the Sr-doped samples have lower specific surface area values because they are obtained at higher temperature. Among pure LaMO 3 perovskites, lanthanum ferrite has the lowest specific surface area (4 m 2 /g), lower value than LaNiO 3 (5.2 m 2 /g), though the last sample was obtained at higher temperature (Table 1).…”

Catalytic combustion of methane over mixed oxides derived from Co–Mg/Al ternary hydrotalcites

“…Extensive efforts have been made to develop Co-based oxide combustion catalysts with the solid solution, perovskite, pyrochlore and hexaaluminate structures [11,14,[16][17][18]24,25]. However, perovskites and pyrochlores and solid solution oxide catalysts suffer from gas diffusion limitation in combustion due to their low specific surface areas (SSAs) [15,[17][18][19]24]. The activity of most hexaaluminates is very low for igniting methane combustion and these are difficult to synthesize [7,10,[20][21][22].…”

“…Generally, supported noble metal oxides, particularly palladium oxide, are excellent catalysts for lower temperature combustion, but noble metals are expensive and prone to deactivation owing to sintering, decomposition and undesirable interaction with supports under hydrothermal situations encountered in combustion [3,6,[8][9][10]. A variety of inexpensive transition metal oxide catalysts, such as solid solution oxides [11][12][13], perovskites [14][15][16], pyrochlores [17][18][19] and hexaaluminates [7,[20][21][22] have been explored for catalytic combustion of methane. Unfortunately, no single catalyst, so far, can tolerate the stringent hydrothermal conditions existing in methane combustion.…”

A Study of White‐Spirit Vapor Combustion on Pt/Al2O3 Catalyst

“…In the same process, catalysts are also used that are based on transition metal oxides, simple (Fe, Co, Mn) or mixed (perovskitic compounds). Although they have, generally, a lower catalytic activity than noble metals, the oxide catalysts have the advantages of lower cost, good thermal stability, and higher resistance to poisoning [1]. On the temperature domain specific for VOC catalytic combustion, typical below 500°C, the contribution of homogeneous (thermal) VOC combustion is practically negligible.…”