EFFECT OF PREPARATION PARAMETERS ON SrTiO3 CATALYST FOR THE FLAMELESS COMBUSTION OF METHANE C. Oliva(a), S. Cappelli(a), L. Fabbrini(a), V. Alberti(a), A. Kryukov(b) and Lucio Forni(a) (a) Dip.CFE, Università di Milano (Italy) (b) D.I.Mendeleev University, Moscow (Russia) Two nano-size-particle samples (T1 and T2) of SrTiO3 have been prepared by a recently proposed innovative method, based on flame-hydrolysis(FH) of aqueous solutions. Besides identical amounts of the other precursors’ salts, either 3 mol excess of tartaric acid (sample T1) or 1.5 mol excess of citric acid (sample T2) as complexing agent were added to the precursors’ solution. The catalysts were characterised by BET, XRD, SEM, EPR. Both of them consisted of SrTiO3 perovskite with some SrCO3 as impurity, T1 being more crystalline than T2. T1 showed the most active as catalyst for the flameless combustion of methane. Both Ti4+/O2- systems and isolated T3+ ions contributed to the EPR spectrum of T1, whilst only the former was present in T2, but with O2- in different position. From the gzz value of the Ti4+/O2- systems, the energy gap (E) for the electron transfer between Ti3+ and O2 to form O2- was calculated, leading to E(T1) = 144; E(T2) = 334 kJ mol-1. This difference, likely connected to the different temperature attained during the FH process with the two different complexing agents, can explain the higher activity of the T1 sample, occurring through the reaction O2- + Ti4+  Ti3+ + O2.

Effect of preparation parameters on SrTiO(3+d) catalyst for the flameless combustion of methane / C. Oliva, S. Cappelli, L. Fabbrini, V. Alberti, A. Kryukov, L. Forni. ((Intervento presentato al convegno 13th International Congress on Catalysis tenutosi a Paris (France) nel 2004.

Effect of preparation parameters on SrTiO(3+d) catalyst for the flameless combustion of methane

C. Oliva
Primo
;
S. Cappelli
Secondo
;
L. Fabbrini;V. Alberti;L. Forni
Ultimo
2004

Abstract

EFFECT OF PREPARATION PARAMETERS ON SrTiO3 CATALYST FOR THE FLAMELESS COMBUSTION OF METHANE C. Oliva(a), S. Cappelli(a), L. Fabbrini(a), V. Alberti(a), A. Kryukov(b) and Lucio Forni(a) (a) Dip.CFE, Università di Milano (Italy) (b) D.I.Mendeleev University, Moscow (Russia) Two nano-size-particle samples (T1 and T2) of SrTiO3 have been prepared by a recently proposed innovative method, based on flame-hydrolysis(FH) of aqueous solutions. Besides identical amounts of the other precursors’ salts, either 3 mol excess of tartaric acid (sample T1) or 1.5 mol excess of citric acid (sample T2) as complexing agent were added to the precursors’ solution. The catalysts were characterised by BET, XRD, SEM, EPR. Both of them consisted of SrTiO3 perovskite with some SrCO3 as impurity, T1 being more crystalline than T2. T1 showed the most active as catalyst for the flameless combustion of methane. Both Ti4+/O2- systems and isolated T3+ ions contributed to the EPR spectrum of T1, whilst only the former was present in T2, but with O2- in different position. From the gzz value of the Ti4+/O2- systems, the energy gap (E) for the electron transfer between Ti3+ and O2 to form O2- was calculated, leading to E(T1) = 144; E(T2) = 334 kJ mol-1. This difference, likely connected to the different temperature attained during the FH process with the two different complexing agents, can explain the higher activity of the T1 sample, occurring through the reaction O2- + Ti4+  Ti3+ + O2.
Settore CHIM/02 - Chimica Fisica
Effect of preparation parameters on SrTiO(3+d) catalyst for the flameless combustion of methane / C. Oliva, S. Cappelli, L. Fabbrini, V. Alberti, A. Kryukov, L. Forni. ((Intervento presentato al convegno 13th International Congress on Catalysis tenutosi a Paris (France) nel 2004.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/199150
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