Correlation between the reduction behavior of ferrospinels synthesized by a ‘soft’ chemical method and their carbon monoxide oxidation activity

Autor:	T. D. Radhakrishnan Nair, Chennampilly Ummer Aniz, P. P. Robinson, K. K. Abdul Rashid
Rok vydání:	2012
Předmět:	Chemistry Inorganic chemistry chemistry.chemical_element Activation energy Reversible process Copper Catalysis Nickel chemistry.chemical_compound Physical chemistry Physical and Theoretical Chemistry Temperature-programmed reduction Cobalt Carbon monoxide
Zdroj:	Reaction Kinetics, Mechanisms and Catalysis. 107:355-365
ISSN:	1878-5204 1878-5190
Popis:	The kinetics of the reduction of nickel, cobalt and copper ferrites was studied by the temperature programmed reduction method at different heating rates in hydrogen atmosphere. The activation energy values of the reduction processes were calculated using the non-isothermal isoconversional method according to the Kissinger-Akahira-Sunose equation and the dependence of apparent activation energy on the degree of conversion was determined. The carbon monoxide oxidation activities of all the three samples were determined at various temperatures up to 140 °C. An interesting correlation between the apparent activation energies for the reduction process was observed. The decreasing trend of activation energy on the ‘extent of conversion’ in all cases showed that the reduction is a multi-step process involving a reversible process followed by an irreversible step.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::92acd1bb44947e0f43f2225c6e83b1b8 https://doi.org/10.1007/s11144-012-0472-y Zobrazit plný text záznamu Full text from SpringerLink