First, second and third row transition metal sulfidos ranging from group VI to group VIII c, supported on activated carbon were evaluafod for thoir ability to catalyze tho hydrodosulfurization of thiophene at atmosphoric pressuro. X-ray photoelectron spectroscopy was used to measure the chemical state and to obtain an indication of the dispersion of the supported sulfide particles. Socond and third row elemonts display volcano curves with catalytic activity varying over more than an order of magnitude and m a x i m occuring at Rh in the second and Ir in the third row. maximum activity located at Cr and Co. The resomblance of these oxporinuntal activity tronds with those previously reported for unsupported transition w t a l sulfides domonstrate the advantage of carbon supports in studios on the intrinsic catalytic propertios of omall sulfide particles. A correlation between the catalytic activity of second and third row elements and the shift in XPS binding energies between metal and motal sulfide phases was found. Superior catalysts have low binding energy shifts and preserve a high degree of metal charactor under sulfiding conditions.
First row elements show a twin-shaped pattern with
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