Abstract
Previous work reported in the literature indicates that vanadium degrades the performance of a cracking catalyst both by promoting undesirable side reactions and by interacting with zeolite, reducing its surface area and number of active sites. The objective of this study was to investigate the activity of vanadium as a function of support and oxidation state. It was found that the vanadium activity is strongly dependent on the type of support. Consequently, vanadium's undesirable side reactions can potentially be decreased by altering the composition of the binder in a zeolitic cracking catalyst. Also, the undesirable reactions catalyzed by vanadium depend strongly on its oxidation state with the oxidized vanadium being much more active than the reduced vanadium. This helps explain why hydrogen pretreatment improves the performance of a vanadium contaminated cracking catalyst.
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