An analytical method using high resolution inductively coupled plasma mass spectrometry(HR-ICP-MS) for rapid simultaneous determination of Na,Mg,Al,P,Ca,V,Fe,Ni,Cu,As,Sb and Pb elements in fluid catalytic cracking(FCC) catalyst was described.
Nanocrystalline nickel with an average diameter of about 16 nm and a face-centered cubic (fcc) structure was uniformly attached to the surface of carbon nanotubes (CNT) by wet chemistry.
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Constitutive Model for an FCC Single-Crystal Material
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Thinking of the yield function as a plastic potential function from the associated flow rule, the elastic-plastic constitutive model for the FCC single-crystal material is constructed, and the corresponding elastic-plastic matrix is educed.
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The experimental results showed that FCC gasoline was obviously reformulated under appropriate reaction conditions.
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The olefins (olefins with C atom number above 4) content of FCC gasoline was markedly reduced, and the aromatics content and octane number were increased.
The catalyst fines(<40μ)recovered by the third stage cyclone of a FCC unit were used as substitute of clay in the final treatment of heavy lube oil stocks and excellent result was obtained with a big saving in costs.
This is a summary account,written in question and answer form.The technical session on FCC energy saving held in last December at the 2nd Refinery.Some references are also made to published articles on this respect.
The zeolite-containing FCC catalyst produced by Lanzhou Refinery was steam deactivated at temperature in the range of 700~850℃ for 2~20 hrs. Results show that the steam deactivation is a first-order decay reaction, at the lower temperature region, the deactivation is chiefly due to changes in matrix, and at the higher temperature region, it is chiefly due to changes in zeolite.