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A precoking selectivation technique is developed to improve the benzene purity in the heavy aromatics transalkylation over Pt/ZSM-12. The effect of precoking is selective to coking condition. Precoking in hydrogen can significantly improve benzene product purity. In contrast, precoking in helium results in severe deactivation of catalytic activity and deteriorates benzene product purity. For Pt/ZSM-12...