Abstract
Vanadium deactivation and tin passivation of vanadium impurities in a model fluid cracking catalyst system consisting of an europium-exchanged Y zeolite and an amorphous aluminosilicate gel have been studied by luminescence techniques. Vanadium is found to be preferentially adsorbed by the gel and does not migrate after deposition and calcination but does migrate between the zeolite and the matrix during steaming. After heating in air at 575 °C, vanadium is in the form of VO 2+ cations on the zeolite and primarily in the form of V 2O 5 on the gel. The environment of Eu 3+ cations is found to be very sensitive to heat treatment but not to the order of tin and vanadium deposition. Upon steaming, EuVO 4 is formed on the zeolite and this formation is promoted by the presence of excess Sn.
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