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Advanced Organic Chemistry: Reaction mechanisms - ionic route of catalytic cracking
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Doc Brown's GCE Chemistry Revising Advanced Level Organic Chemistry
A Level Revision Notes PART 10 Summary of organic reaction mechanisms A mechanistic introduction to organic chemistry and explanations of different types of organic reactions Alkanes and Petrochemical Industry INDEX for advanced level chemistry revision notes for GCSE/IGCSE/O level notes see CRACKING - a problem of supply and demand, other products 10.2.4 An ionic mechanism for catalytic cracking (a) Catalytic cracking occurs at lower temperatures over a ceramic/zeolite catalytic material based on silica and/or aluminium oxide (I've called it Z in the mechanisms). The mechanism is believed to be ionic and some examples of reaction steps are given below. Z represents a matrix element of the alumino-silicate catalyst and can act in a variety ways e.g. Lewis acid or base, Bronsted-Lowry acid or base. R1, R2, R3 = alkyl groups.
(b) A catalytic 'ionic' cracking cycle via alkenes: I found this example in the literature, and the aluminosilicate/zeolite matrix (Z) acts alternately as an acid in step 1 and a base in step 4. Unfortunately it does involve starting with a rather a 'big' alkene called 2,4,4-trimethylpent-1-ene (it was the only example I could find in a local university library).
(c) FURTHER COMMENTS
Alkanes and Petrochemical Industry INDEX for advanced level chemistry revision notes for GCSE/IGCSE/O level notes see CRACKING - a problem of supply and demand, other products
See also INDEX of ALKANES and the petrochemical industry revision notes INDEX
See also INDEX of ALKANES and the petrochemical industry revision notes INDEX |
Doc Brown's Chemistry |
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