Zeolite-mediated production of cyclic organic carbonates: reaction of CO2 with styrene oxide on zeolite Y impregnated with metal halides,Reaction Chemistry & Engineering

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Zeolite-mediated production of cyclic organic carbonates: reaction of CO2 with styrene oxide on zeolite Y impregnated with metal halides
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2021-3-2 , DOI: 10.1039/d1re00036e
Leonardo P. Ozorio _{1,

2,

3,

4} , Fábio J. S. Henrique _{2,

3,

4,

5} , James W. Comerford _{6,

7,

8,

9,

10} , Michael North _{6,

7,

8,

9,

10} , Claudio J. A. Mota _{1,

2,

3,

4,

5}

Affiliation

Zeolites LiY, NaY, KY and ZnY were impregnated with small amounts of the corresponding metal halides (chloride, bromide and iodide) and tested as catalysts for the carboxylation of styrene oxide with CO₂. The KI/KY system was tested at 100 °C and 50 bar and yielded 100% of styrene carbonate, by ¹H NMR, within 6 h, whereas KI alone required 15 h to achieve the same yield. The reaction occurs inside the zeolite pores, with the metal cations acting as Lewis acidic centers and the impregnated halides as nucleophiles. Theoretical calculations indicated that chlorides are better stabilized within the zeolite cage than iodides, explaining the reactivity order and suggesting a solvent-like behavior of the zeolite structure.

中文翻译：

沸石介导的环状有机碳酸酯的生产：CO 2与氧化苯乙烯在浸渍有金属卤化物的沸石Y上的反应

用少量相应的金属卤化物（氯化物，溴化物和碘化物）浸渍LiY，NaY，KY和ZnY沸石，并测试了它们用作CO ₂催化苯乙烯氧化的催化剂。KI / KY系统在100°C和50 bar下进行测试，通过¹ H NMR在6小时内产生100％的碳酸苯乙烯苯乙烯，而仅KI需要15小时才能达到相同的产率。该反应发生在沸石孔内部，其中金属阳离子充当路易斯酸性中心，而浸渍的卤化物充当亲核试剂。理论计算表明，氯化物在沸石笼中的稳定性比碘化物更好，这说明了反应顺序并暗示了沸石结构的溶剂状行为。

更新日期：2021-03-10

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