Abstract
Ethylene and propylene production via the catalytic pyrolysis of methyl chloride was studied over zeolite catalyst TsVM (the Russian analogue of ZSM-5) and silicoaluminophosphate catalyst SAPO-34. SAPO-34 is more efficient in light olefin (in particular, ethylene and propylene) formation; this catalyst provides 55–60% methyl chloride conversion at 400 and 450°C and a contact time of 3 s with the 80–85% ethylene + propylene selectivity. The ethylene selectivity at 450°C is 15% higher than at 400°C. The reaction rate for methyl chloride conversion over SAPO-34 is described by a first-order equation. The catalyst gradually loses activity during methyl chloride conversion as a result of carbonization but recovers it completely after regeneration in air at 500°C. The catalyst can be recommended for further pilot-scale testing.
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