Role of potassium added to Ce/NaZSM-5 catalyst in partial oxidation activity of benzyl alcohol
Literature Information
Nao Idaka, Satoru Nishiyama, Shigeru Tsuruya
The vapor-phase catalytic oxidation of benzyl alcohol was carried out over cerium-impregnated NaZSM-5 (Ce/NaZSM-5) and K-added Ce/NaZSM-5 catalysts. The main products were benzaldehyde and carbon dioxide, together with trace amounts of benzene and toluene. The effect of the added K on the catalytic activity in the benzyl alcohol oxidation was different by the amount of supported Ce (Ce: 1.4 × 10−2–7.1 × 10−1 mmol g(NaZSM-5)−1, low Ce (CeL): ≃10−2 mmol g(NaZSM-5)−1, high Ce (CeH): ≃10−1 mmol g(NaZSM-5)−1). The BET surface area and the temperature-programmed oxidation (TPO) of the fresh and the used K-added Ce/NaZSM-5 catalysts was measured to obtain information on the role of the added K in the catalytic activity of the benzyl alcohol oxidation. The amount of O2 uptake of the pre-reduced K-added CeH/NaZSM-5 catalysts was also measured to estimate the ability to store the oxygen species on the cerium. The main role of potassium added to the high Ce-loaded NaZSM-5 (CeH/NaZSM-5) catalyst was to prevent the build-up of coke-like materials on the catalyst surface during the oxidation and so prolong the catalytic life.
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