What is the impact of different silica supports on the dispersion of Na2WO4 and the resulting catalytic performance in the oxidative coupling of methyl chloride to vinyl chloride?

Label:chem

Topic
The choice of support material can significantly influence the dispersion of active species and the overall catalytic performance.
Answer
Different silica supports, such as FDU-12, ZSM-22, and S-1, were compared with β-zeolite. Only β-zeolite achieved a highly dispersed state of Na2WO4 nanoclusters, leading to superior catalytic performance. Other supports resulted in significant aggregation of Na2WO4, reducing catalytic activity and selectivity.
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