Silica and alumina supported tantalum and tungsten hydrides were tested in alkane metathesis, for comparison of their catalytic properties. In propane metathesis [W]–H/Al2O3 proves to be twice more efficient than the usual [Ta]–H/SiO2 catalyst which is still better than [Ta]–H/Al2O3 and [W]–H/SiO2. Tungsten based catalysts lead to a narrower distribution in the products selectivity and to a higher amount of linear products than [Ta]–H/SiO2. [W]–H/Al2O3 is also a better catalyst than [Ta]–H/SiO2 for butane metathesis but is less efficient with ethane. Whereas the results in the case of propane or butane can involve the higher initial activity and a lower deactivation of the tungsten catalyst, in the case of ethane, mechanistic or kinetic aspects can be envisaged in particular concerning the difficulty to dehydrogenate ethane into ethylene.
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Taoufik, M., Roux, E.L., Thivolle-Cazat, J. et al. Alumina supported tungsten hydrides, new efficient catalysts for alkane metathesis. Top Catal 40, 65–70 (2006). https://doi.org/10.1007/s11244-006-0108-4
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DOI: https://doi.org/10.1007/s11244-006-0108-4