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Fig. 2. Catalytic performance of toluene methylation using CO2+ H2 or methanol. (A) Influence of the ZZO mass percent in ZZO and 2SZ5 on the product distribution (CO free), toluene conversion, and PX selectivity in xylene. 10%# means that ZZO was directly deposited on Z5 powder. (B) Influence of Z5-modified times by TEOS on the product distribution (CO free), toluene conversion, and PX selectivity in xylene. (C) The comparisons of carbon usage and PX selectivity in xylene via methanol route and CO2 route. (D) Apparent activation energy of toluene by methanol or CO2/H2 route on 4SZ5 or ZZO-4SZ5 catalysts, respectively.
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