Abstract

The catalysts were synthesized based on the spent industrial aluminum-chromium catalyst used in the hydrocarbon dehydrogenation by SABIC Co., and the catalysts were modified with copper and potassium carbonate. The catalysts were tested in the oxidative dehydrogenation of ethylbenzene to styrene. It was found that the prepared and modified 1 wt % Cu catalyst, upon the conversion of ethylbenzene to styrene in the presence of O₂, exhibits an activity of 53% with a selectivity for styrene of 85%. It was shown that the introduction of carbon dioxide into the reaction zone leads to an increase in activity to 60–63%, and selectivity to 89–91%. The stability of the functioning of a copper-promoted catalyst and the effect of water vapor on the process were studied. It was found that under conditions close to industrial, within 100 h, a stable conversion of the mixture (ethylbenzene : O₂ = 9 : 1) : H₂O = 4 : 1 with a selectivity for styrene of at least 90% at a space velocity of 2 h^–1 (at liquid ethylbenzene).

中文翻译：

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耗尽的铝铬催化剂上乙苯的氧化脱氢制苯乙烯

摘要

基于SABIC Co.在烃类脱氢中使用的工业铝铬废催化剂，合成了催化剂，并对催化剂进行了铜和碳酸钾的改性。在乙苯氧化脱氢成苯乙烯的过程中测试了催化剂。发现在O ₂存在下乙苯转化为苯乙烯后，制备和改性的1 wt％Cu催化剂表现出53％的活性，对苯乙烯的选择性为85％。结果表明，将二氧化碳引入反应区可将活性提高到60-63％，选择性提高到89-91％。研究了铜助催化剂的功能稳定性和水蒸气对工艺的影响。发现在接近工业的条件下，在100 h内，混合物（乙苯：O ₂ = 9：1）：H ₂ O = 4：1的稳定转化率和对苯乙烯的选择性至少为90％。 2 h ^–1的空速（在液体乙苯中）。