The selectivity in maleic anhydride formation from butane under different reagent conditions and on (VO)2P2O7 catalysts with different rates of oxidn. of V was studied and compared with the results obtained in the oxidn. of propane and ethane, in the ammoxidn. of propane, and in the oxidn. of butane on different V-based catalysts (V-Ti oxide and V-Sb oxide). The results indicate that in the selective oxidn. of alkanes not only the first step of activation is important, but also the stability of the products formed under the reaction conditions, which depends either on the oxidizing power of the surface or on the stability of the product formed as regards consecutive oxidn. The other V-based catalysts tested are also able to activate the paraffin, but not to control the oxidn., and only carbon oxides are formed. Similarly, propane and ethane are also activated, but due to the reactivity of the products in consecutive oxidn., only carbon oxides are obtained. On the contrary, in the ammoxidn. of propane, due to the higher stability of the product, acrylonitrile is formed at the higher temps. and propylene at the lower temps. Ammonia, however, is a strong inhibitor of the activity of the catalyst sites, to which the ability of these catalysts in the activation of the paraffinic hydrocarbon was attributed. [on SciFinder(R)]

Functionalization of alkanes by heterogeneous vapour-phase oxidation. II. Propane ammoxidation

CENTI, Gabriele;
1987

Abstract

The selectivity in maleic anhydride formation from butane under different reagent conditions and on (VO)2P2O7 catalysts with different rates of oxidn. of V was studied and compared with the results obtained in the oxidn. of propane and ethane, in the ammoxidn. of propane, and in the oxidn. of butane on different V-based catalysts (V-Ti oxide and V-Sb oxide). The results indicate that in the selective oxidn. of alkanes not only the first step of activation is important, but also the stability of the products formed under the reaction conditions, which depends either on the oxidizing power of the surface or on the stability of the product formed as regards consecutive oxidn. The other V-based catalysts tested are also able to activate the paraffin, but not to control the oxidn., and only carbon oxides are formed. Similarly, propane and ethane are also activated, but due to the reactivity of the products in consecutive oxidn., only carbon oxides are obtained. On the contrary, in the ammoxidn. of propane, due to the higher stability of the product, acrylonitrile is formed at the higher temps. and propylene at the lower temps. Ammonia, however, is a strong inhibitor of the activity of the catalyst sites, to which the ability of these catalysts in the activation of the paraffinic hydrocarbon was attributed. [on SciFinder(R)]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11570/1906887
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