| http://www.w3.org/ns/prov#value | - In another embodiment, the used catalyst originates from a bulk catalyst precursor of the formula (X)a(M)b[(CH3CH2)cN(CH3)3]dOz as disclosed in US Patent Publication No. 20060060502, wherein X is a Group VIII non-noble metal, M is selected from Mo and W, c is an integer from 10 to 40, the molar ratio of a:b is from 0.5/1 to 3/1.
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