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Sulphur reduction additive prepared from caustic-modified kaolin

¹ College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, PR China, ² Petrochemical Research Institute, Lanzhou Petrochemical Company, PetroChina, Lanzhou 730060, PR China, ³ Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou 730000, PR China

^* E-mail: sunshuhong{at}netease.com

(Received 16 March 2005; revised 4 May 2005)

The performance of a fluidized cracking catalyst additive prepared from caustic-modified kaolin microspheres for gasoline S reduction was investigated using N₂ adsorption, infrared acid-site characterization, X-ray diffraction and small-scale fluid bed reactor tests. The additive exhibited improved coke selectivity and yield distribution, and the S content of cracked gasoline was reduced significantly. The results indicated that a reactive mesoporous structure was formed in the modified kaolin.

KEYWORDS: modified kaolin, catalytic cracking, FCC additive, coke, gasoline, sulphur

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