6533b834fe1ef96bd129de37

RESEARCH PRODUCT

Selective oxidative dehydrogenation of ethane on MoVTeNbO mixed metal oxide catalysts

subject

description

Abstract MoVTeNbO catalysts, prepared by hydrothermal synthesis, are active and highly selective in the ODH of ethane, especially those with a MoVTeNb molar ratio of 1–0.15–0.16–0.17 and heat-treated at 600–650 °C. On the best catalyst, selectivities higher than 80% at ethane conversion levels higher than 80% have been obtained operating at relatively low reaction temperatures (340–400 °C). Thus, yields of ethylene of ca. 75% have been obtained, which exceeds the best yield reported in the literature. Te 2 M 20 O 57 ( M =Mo, V, Nb) and (V,Nb)-substituted θ -Mo 5 O 14 , in addition to small amounts of the Te 0.33 M O 3.33 ( M =Mo, V, Nb) phase, can be proposed in the most selective catalysts from XRD, SAED, and HREM results. However, the catalytic performance in ethane oxidation can mainly be related to the presence of the multifunctional Te 2 M 20 O 57 orthorhombic phase in cooperation with the Mo 5 O 14 -type phase. The nature of active and selective sites is discussed.