Resumo

MORENO, Andrea L. et al. Use of the 2-propanol decomposition as a technique for the characterization of the acid-base properties of hydrotreating CoMo catalysts. Rev. ion [online]. 2011, vol.24, n.2, pp.57-65. ISSN 0120-100X.

The acid-base properties of CoMo catalysts supported on amorphous alumino-silicates (ASA) with different Si/(Si+Al) atomic ratios and on alumina modified with B were determined using the 2-propanol decomposition reaction. Results were compared and validated with isopropylamine decomposition tests and with FT-IR measurements of adsorbed pyridine. A good reproducibility and high sensitivity of the 2-propanol dehydration reaction to changes and/or modifications of the catalyst surface were observed. In the case of the CoMo catalysts supported on ASA, density, strength and total active sites number increases when the Si/(Si+Al) ratio increases. This fact is attributed to an increase in the Brönsted acid sites. On the other hand, an increase in density and strength of acid sites with the increase in the B amount was observed in the case of CoMo catalysts modified with B. The results of this study support the conclusion that the selectivity in the decomposition of 2-propanol reaction is sensitive to changes in the acid-base properties showing reproducible results and comparable with the ones obtained from more expensive and sophisticated methods.

Palavras-chave : CoMo catalysts; acid-base characteristics; isopropylamine decomposition; pyridine adsorption.

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