In this paper, dodecylamine (DDA) is used as the template, and ethyl orthosilicate (TEOS) is used as the silicon source. The HMS molecular sieve is prepared by in situ synthesis and modified by Cu, Ce, and Cu/Ce. The Cu/Ce-HMS molecular sieve catalyst was synthesized for the first time. Scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), and Fourier transform infrared spectrometer (FTIR) were used to characterize the synthesized composite molecular sieve. The results showed that the metal was loaded on the HMS intact and did not change the morphology of the HMS. A mixture of n-hexane and dibenzothiophene (DBT) was used as the model oil, and the oxidation removal of DBT in the model oil was used as a probe reaction to study the photocatalytic oxidative desulfurization performance of the composite catalyst. The results show that the desulfurization rate after modification is Cu/Ce-HMS molecular sieve > Cu-HMS molecular sieve > Ce-HMS. Finally, we explored the reaction mechanism of catalyst desulfurization. The results of ultraviolet diffuse reflectance showed that the modified molecular sieve Cu/Ce-HMS had a smaller band gap, greater reaction activity, and stronger photocatalytic performance, which is benefit to improve the desulfurization efficiency. We report a simple and effective preparation method of composite molecular sieve catalyst, which provides a certain reference for future desulfurization research.

中文翻译：

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双金属改性HMS分子筛的制备及其脱硫性能机理

本文以十二胺（DDA）为模板剂，原硅酸乙酯（TEOS）为硅源。HMS分子筛采用原位合成法制备，并经Cu、Ce、Cu/Ce改性。首次合成了Cu/Ce-HMS分子筛催化剂。使用扫描电子显微镜（SEM）、能谱仪（EDS）和傅里叶变换红外光谱仪（FTIR）对合成的复合分子筛进行表征。结果表明金属完整地负载在HMS上并且没有改变HMS的形态。以正己烷和二苯并噻吩（DBT）的混合物为模型油，以模型油中DBT的氧化脱除为探针反应，研究复合催化剂的光催化氧化脱硫性能。结果表明，改性后脱硫率为Cu/Ce-HMS分子筛>Cu-HMS分子筛>Ce-HMS。最后，我们探讨了催化剂脱硫的反应机理。紫外漫反射结果表明，改性分子筛Cu/Ce-HMS带隙更小，反应活性更大，光催化性能更强，有利于提高脱硫效率。报道了一种简单有效的复合分子筛催化剂的制备方法，为今后的脱硫研究提供了一定的参考。紫外漫反射结果表明，改性分子筛Cu/Ce-HMS带隙更小，反应活性更大，光催化性能更强，有利于提高脱硫效率。报道了一种简单有效的复合分子筛催化剂的制备方法，为今后的脱硫研究提供了一定的参考。紫外漫反射结果表明，改性分子筛Cu/Ce-HMS带隙更小，反应活性更大，光催化性能更强，有利于提高脱硫效率。报道了一种简单有效的复合分子筛催化剂的制备方法，为今后的脱硫研究提供了一定的参考。