Compositions comprising nickel and their use as catalyst in...

C - Chemistry – Metallurgy – 07 – C

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C07C 5/48 (2006.01) B01J 23/755 (2006.01) B01J 23/76 (2006.01) B01J 23/80 (2006.01) B01J 23/83 (2006.01) B01J 23/847 (2006.01) C01G 53/04 (2006.01) C07C 17/357 (2006.01)

Patent

CA 2363035

Catalysts and methods for alkane oxydehydrogenation are disclosed. The catalysts of the invention generally comprise (i) nickel or a nickel-containing compound and (ii) at least one or more of titanium (Ti), tantalum (Ta), niobium (Nb), cobalt (Co), hafnium (Hf), tungsten (W), yttrium (Y), zinc (Zn), zirconium (Zr), or aluminum (Al), or a compound containing one or more of such element(s). In preferred embodiments, the catalyst is a supported catalyst, the alkane is selected from the group consisting of ethane, propane, isopropane, isobutane, n-butane and ethyl chloride, molecular oxygen is co-fed with the alkane to a reaction zone maintained at a temperature ranging from about 250 °C to about 350 °C, and the ethane is oxidatively dehydrogenated to form the corresponding the alkene with an alkane conversion of at least about 10 % and an alkene selectivity of at least about 70 %.

L'invention concerne des catalyseurs et des procédés destinés à la déshydrogénation oxydative de l'alcane. Les catalyseurs selon l'invention comprennent en général (i) du nickel ou un composé à base de nickel et (ii) au moins un élément sélectionné parmi le titane (Ti), le tantale (Ta), le niobium (Nb), le cobalt (Co), l'hafnium (Hf), le tungstène (W), l'yttrium (Y), le zinc (Zn), le zirconium (Zr), ou l'aluminium (Al), ou un composé contenant l'un au moins de ces éléments. Dans les modes de réalisation préférés, le catalyseur est un catalyseur supporté, l'alcane est choisi dans le groupe composé de l'éthane, du propane, de l'isopropane, de l'isobutane, du n-butane et du chlorure d'éthyle ; de l'oxygène moléculaire est coalimenté avec l'alcane jusqu'à une zone de réaction qui est maintenue à une température comprise entre 250 DEG C et 350 DEG C environ, l'éthane est ensuite déshydrogéné par oxydation pour produire l'alcène correspondant, et ce avec une conversion de l'alcane d'au moins 10 % environ et une sélectivité de l'alcène d'au moins 70 % environ.

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