Oxidative dehydrogenation of n-butane: a comparative study of thermal and catalytic reaction using Fe–Zn mixed oxides

Authors: Toledo J.A.; Armendariz H.; López-Salinas E.

Source: Catalysis Letters, Volume 66, Numbers 1-2, 2000 , pp. 19-24(6)

Publisher: Springer

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Abstract:

The thermal cracking of n-butane was compared with both thermal and catalytic n-butane oxidative dehydrogenation reactions. It was found that thermal oxidative dehydrogenation of n-butane was highly selective to n-butenes (approximately 70%) in the conversion range of 11–20%. This reaction proceeded at lower temperature than the thermal cracking of n-butane without oxygen. These results suggest that both reactions have different initiation steps. In the thermal cracking of n-butane the reaction initiated by the C–C bond scission, whereas for the thermal oxidative dehydrogenation of n-butane the removal of the hydrogen atom by the molecular oxygen to form {\dot{C}}_{4}H_{9} and H{\dot{O}}_{2} radicals was proposed as the main initiation step. On the other hand, butadiene was only obtained via a catalytic pathway, being strongly dependent on the reaction conditions.

Keywords: -butane oxidative dehydrogenation; -butane thermal cracking; iron–zinc mixed oxides

Language: English

Document Type: Regular paper

Affiliations: 1: Instituto Mexicano del Petróleo, Programa de Simulación Molecular, Lázaro Cárdenas No. 152, Col. San Bartolo Atepehuacan, Deleg. Gustavo A. Madero, C.P. 07730 México D.F., Mexico E-mail: jtoledo@www.imp.mx

Publication date: 2000-01-01