Abstract
The local structure of non-porphyrin Ni and V in Maya residuum, hydrocracked residuum, and toluene-insoluble solid were determined by XAFS spectroscopy. In residuum, the first coordination shell of non-porphyrin V is similar to that for vanadyl tetraphenylporphyrin with four N at a distance of 2.08 Å and one O at
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