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It was found that partially deactivated coke could not be burnt up with air up to 400 ◦C. The activity was about 95% of original value with fresh catalyst, but the isomerization selectivity increased about 5%. Upon regeneration at 500 ◦C with air, the catalyst recovered more than 99% of its original activity and selectivity. Thus the change of catalytic behavior after low temperature regeneration could be attributed to fact that cracking activity was suppressed partially by coking the isolated strong acid sites
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