| 摘要 |
An additive to enhance the activity of an FCC catalyst co:-itaining zeolite and matrix components comprises zeolite microspheres having a novel morphology comprising a macroporous matrix and crystallized zeolite freely coating the walls of the pores of the matrix. The additives formed from microspheres containing a metakaolin and kaolin ca:Lcined through its exotherm, the latter calcined kaolin being derived from a kaolin having a high pore volume. Kaolin having a high pore volume can be a pulverized ull:rafine kaolin or a kaolin which has been pulverized to have an incipient slurry point less than 57% solids.
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