A combined spectroscopic and catalytic study of the NO reactivity on microporous cobalt-aluminophosphates, copper-aluminophosphates and copper-silicoaluminophosphates with chabasite-related structure, CoAPO-18, CoAPO-34, CuAPO-34 and CuAPSO-34 is reported. CoAPO-18 catalyst was synthesised using N,N-diiso-propylethylamine (DIPE), whereas CoAPO-34, CuAPO-34 and CuAPSO-34 were prepared using morpholine as structure directing template. NO and CO adsorption on both oxidised and reduced catalysts was monitored by FTIR spectroscopy. These studies revealed that Co2+/Co3+ and Cu+/Cu2+ redox couples, which should be the locus of the catalytic activity, are present respectively in the cobalt- and copper-containing catalysts. Catalytic tests of both NO oxidation to NO2 by oxygen and NO reduction by CO were performed. CoAPO-34 catalysts showed exceptionally high performances in the NO oxidation, which were superior of the well-known Cu-ZSM-5, and a very poor activity in the NO reduction. A different behaviour was found for CuAPO-34 catalysts which, beside a good activity in the NO oxidation to NO2, showed a very high activity in the NO reduction by CO when oxygen was absent in the reaction feed.
Synthesis, Spectroscopic and Catalytic Properties of Cobalt and Copper Ions in Aluminophosphates with Chabasite-like Structure. Studies of the NOx Reactivity / A., Frache; L., Marchese; M., Cadoni; S., Coluccia; Palella, BORIS IGOR; R., Pirone; P., Ciambelli. - STAMPA. - 140:(2000), pp. 269-277. (Intervento presentato al convegno Oxide-based Systems at the Crossroads of Chemistry, Second International Workshop tenutosi a Como nel 2001, October 8th-11th).
Synthesis, Spectroscopic and Catalytic Properties of Cobalt and Copper Ions in Aluminophosphates with Chabasite-like Structure. Studies of the NOx Reactivity
PALELLA, BORIS IGOR;
2000
Abstract
A combined spectroscopic and catalytic study of the NO reactivity on microporous cobalt-aluminophosphates, copper-aluminophosphates and copper-silicoaluminophosphates with chabasite-related structure, CoAPO-18, CoAPO-34, CuAPO-34 and CuAPSO-34 is reported. CoAPO-18 catalyst was synthesised using N,N-diiso-propylethylamine (DIPE), whereas CoAPO-34, CuAPO-34 and CuAPSO-34 were prepared using morpholine as structure directing template. NO and CO adsorption on both oxidised and reduced catalysts was monitored by FTIR spectroscopy. These studies revealed that Co2+/Co3+ and Cu+/Cu2+ redox couples, which should be the locus of the catalytic activity, are present respectively in the cobalt- and copper-containing catalysts. Catalytic tests of both NO oxidation to NO2 by oxygen and NO reduction by CO were performed. CoAPO-34 catalysts showed exceptionally high performances in the NO oxidation, which were superior of the well-known Cu-ZSM-5, and a very poor activity in the NO reduction. A different behaviour was found for CuAPO-34 catalysts which, beside a good activity in the NO oxidation to NO2, showed a very high activity in the NO reduction by CO when oxygen was absent in the reaction feed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.