Mechanism of norbornadiene dimerization promotion by Co-species-modified alkali-treated zeolite

IF 3.5 3区工程技术 Q2 ENGINEERING, CHEMICAL

AIChE Journal Pub Date : 2025-05-20 DOI:10.1002/aic.18914

Qi Lu, Lili Tong, Xiaolei Guo, Kang Xue, Li Wang, Chengxiang Shi, Ruijie Gao, Ji-Jun Zou, Xiangwen Zhang, Lun Pan

引用次数: 0

Abstract

Norbornadiene (NBD) dimer is one of the most important high-energy-density fuels for aerospace propulsion, but it is difficult to synthesize with high efficiency. Herein, we fabricated nano-cobalt loaded alkali-treated HY zeolite, which significantly promotes the NBD dimerization reaction with a conversion of 73.5% and a selectivity of 84.7%, which is a 20% higher yield than previously reported catalysts. The characterizations confirm that the mild alkali treatment expands the zeolite pore size, providing more reaction space and enhancing the NBD conversion. The in situ Fourier-transform infrared spectra demonstrate that alkali-treated zeolites can adsorb more NBD, and the incorporation of Co species enhances the adsorption of double bonds to form a stable transition state with a three-center two-electron configuration, thereby promoting the reaction. The dimerization product after hydrogenation has a high density (1.06 g/mL at 20°C) and high volumetric neat heat of combustion (45.3 MJ/L), which is very promising for practical application.

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共种改性碱处理沸石促进降冰片二烯二聚的机理

降冰片二烯（NBD）二聚体是重要的高能量密度航空推进燃料之一，但其高效合成较为困难。本研究制备的纳米载钴碱处理HY沸石，显著促进了NBD二聚化反应，转化率为73.5%，选择性为84.7%，比前人报道的催化剂产率提高了20%。表征结果表明，温和碱处理扩大了沸石的孔径，增加了反应空间，提高了NBD的转化率。原位傅里叶红外光谱表明，碱处理的沸石可以吸附更多的NBD， Co的加入增强了对双键的吸附，形成稳定的三中心双电子构型过渡态，从而促进了反应。加氢后的二聚化产物密度高（20℃时为1.06 g/mL），体积净燃烧热高（45.3 MJ/L），具有很好的实际应用前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

AIChE Journal 工程技术-工程：化工

CiteScore

7.10

自引率

10.80%

发文量

411

审稿时长

3.6 months

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