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Thermal activation effect on catalytic systems MnO x /Al2O3 for deep oxidation of hydrocarbons

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Abstract

The effect of thermal activation, sharp increase in the catalytic activity of the system MnO x -Al2O3 in reactions of deep oxidation of CO and hydrocarbons after calcination of the catalyst at 900–1000°C was discovered and investigated. With the use of X-ray phase analysis, X-ray electron spectroscopy, EXAFS, IR spectroscopy, electronic spectroscopy of diffuse reflections, electron microscopy etc. it was established that the effect of thermal activation is related to reversible phase transitions in the system at heating and cooling. On cooling from 1100°C to 650°C disperse particles of cubic spinel of composition Mn2.1 − x · Al0.9 + x O4 are conserved on the corundum surface. On further cooling the spinel decomposes and finally the nanocristalline species of β-Mn3O*4 containing up to 15 at% of Al3+ form and govern the activity.

The thermal activation effect was implemented in an industrial catalyst IK-12-40. Joint Stocks Co “KATALIZATOR” produced and supplied to customers hundreds of tons of this catalyst. The catalyst was awarded with a silver medal of the International exhibition EUREKA in Brussels (1995).

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Authors and Affiliations

  1. Institute of Problems of Hydrocarbons Processing, Siberian Division, Russian Academy of Sciences, Neftezavodskaya ul., Omsk, 644040, Russia

    P. G. Tsyrul’nikov

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Correspondence to P. G. Tsyrul’nikov.

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Original Russian Text © P.G. Tsyrul’nikov, 2007, published in Russkii Khimicheskii Zhurnal, 2007, Vol. 51, No. 4, pp. 133–139.

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Tsyrul’nikov, P.G. Thermal activation effect on catalytic systems MnO x /Al2O3 for deep oxidation of hydrocarbons. Russ J Gen Chem 77, 2328–2336 (2007). https://doi.org/10.1134/S1070363207120389

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