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Effect of silicon incorporation method in the supports of NiMo catalysts for hydrotreating reactions

机译：硅掺入方法对NiMo催化剂加氢处理反应的影响

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NiMo catalysts supported on Al-Si supports with 5 wt% Si were prepared by two methods: 1) by incorporating Si into boehmite, followed by drying and calcination producing the catalyst NiMo/Si-Al and 2) by incorporating Si into the surface of an already calcined alumina producing NiMo/Si/Al. These two methods of Si incorporation into the alumina produced different surface structures of the Si oxide overlayer and affected the performance of the supported active Ni-Mo-S phase during the processing of partially hydrotreated Maya crude oil and during cumene hydrocracking, which is used as a model reaction to analyze the acidity function of the catalysts. The purpose of using partially hydrotreated Maya crude oil as feedstock is to test the catalysts in the hydrodesulfurization (HDS) of highly refractory sulfur compounds, such as 4,6-dimethyldibenzothiophene. The supports and catalysts (fresh and spent) are analyzed using nitrogen physisorption, X-ray diffraction, scanning electron microscopy-energy dispersive spectroscopy, and Fourier-transform infrared spectroscopy of surface hydroxyl groups. Depending on the method employed to incorporate Si into the support, the catalyst properties are affected, resulting in higher conversion in hydrotreating (HDT) reactions. The catalysts with Si incorporated into boehmite display the highest activity in the HDT of refractory compounds present in Maya HDT/Diesel HDS (50/50 vol%) feedstock, which is the result of higher dispersion of the active phase, combined with adequate porosity and acidity.
机译：通过两种方法制备负载在含5 wt％Si的Al-Si载体上的NiMo催化剂：1）将Si掺入勃姆石，然后进行干燥和煅烧以生产催化剂NiMo / Si-Al； 2）通过将Si掺入勃姆石表面。已经煅烧的氧化铝，产生NiMo / Si / Al。这两种将Si掺入到氧化铝中的方法在部分加氢处理的Maya原油加工过程中和枯烯加氢裂化过程中都产生了不同的Si氧化物表层表面结构，并影响了负载型活性Ni-Mo-S相的性能。模型反应以分析催化剂的酸度功能。使用部分加氢处理的玛雅原油作为原料的目的是测试高耐性硫化合物（例如4,6-二甲基二苯并噻吩）的加氢脱硫（HDS）中的催化剂。使用氮物理吸附，X射线衍射，扫描电子显微镜-能量分散光谱和表面羟基的傅里叶变换红外光谱分析载体和催化剂（新鲜的和用过的）。取决于将Si结合到载体中所采用的方法，催化剂的性能受到影响，导致加氢处理（HDT）反应中的转化率更高。掺入勃姆石的Si催化剂在Maya HDT / Diesel HDS（50/50 vol％）原料中存在的难熔化合物的HDT中表现出最高的活性，这是由于活性相分散性更高，孔隙率和酸度。

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