Abstract
Vanadium deposited at a level of 8000 ppm on SiO 2 Al 2O 3, rare-earth exchanged Y zeolite in a silica-alumina matrix, NdY, and USY by impregnation with vanadyl tetraphenylporphyrin was studied by extended X-ray absorption fine structure (EXAFS) after calcination and after further steaming. Catalyst preparations were chosen to simulate conditions within a fluid catalytic cracking unit. In all cases, radial structure functions obtained from the EXAFS analysis were very similar and showed only a single peak due to coordination of vanadium to nearest neighbor oxygen. This is interpreted to mean vanadium exists as highly dispersed, perhaps isolated, VO x units where x is probably near four.
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