Abstract Phosphorus-modified ZSM-5 (P-ZSM-5) shows catalytic activity for the cracking of alkanes to produce light olefins such as ethylene and propylene. Here, we investigated the effect of the carbon number (i.e., chain length) of straight-chain alkanes (n-pentane, n-hexane, n-heptane, and n-octane) on the production of ethylene and propylene by catalytic cracking over P-ZSM-5 at 923 K or 873 K. The percent of n-alkane converted and yields of light olefins increased with increasing carbon number of the reactant hydrocarbon. In the case of n-octane cracking at 923 K, 97.1% conversion of the alkane and 64.5% combined yield of ethylene and propylene were obtained. Up to a reaction time of 30 h, the P-ZSM-5 catalyst was stable and the n-octane conversion remained over 91.2%.

中文翻译：

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碳数对磷改性ZSM-5催化裂化直链烷烃生产丙烯和乙烯的影响

摘要 磷改性 ZSM-5 (P-ZSM-5) 对烷烃裂解生产乙烯和丙烯等轻质烯烃具有催化活性。在这里，我们研究了直链烷烃（正戊烷、正己烷、正庚烷和正辛烷）的碳数（即链长）对催化裂化生产乙烯和丙烯的影响。 P-ZSM-5 在 923 K 或 873 K。正烷烃转化的百分比和轻质烯烃的产率随着反应烃碳数的增加而增加。在 923 K 下正辛烷裂化的情况下，获得了 97.1% 的烷烃转化率和 64.5% 的乙烯和丙烯的综合收率。反应时间长达 30 小时，P-ZSM-5 催化剂稳定，正辛烷转化率保持在 91.2% 以上。