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采用两步浸渍法和载体上的原位反应制备了一系列Cs部分取代的Ni-Csx H3-x PW12O40/SiO2催化剂,并用N2吸附比表面积测定(BET)、电感耦合等离子体发射光谱(ICP)、X射线衍射(XRD)、拉曼光谱(Raman)、原位X射线衍射(in situ XRD)、NH3程序升温脱附(NH3-TPD)、H2程序升温还原(H2-TPR)、H2程序升温脱附(H2-TPD)、吡啶吸附傅里叶变换红外(FTIR)光谱等分析测试技术对催化剂进行了表征.以正癸烷为模型化合物,对催化剂的加氢裂化性能进行了评价.结果表明,8%Ni-50%Cs1.5H1.5PW/SiO2催化剂具有最高的C5+收率,明显优于8%Ni-50%H3PW/SiO2催化剂和工业催化剂.随着Cs在Csx H3-x PW中比例的增加,正癸烷的转化率逐渐降低,而C5+选择性则逐渐提高.当催化剂具有合适的孔径时,选择性的提高是由于催化剂酸性的减弱,而转化率的降低则是由于催化剂加氢能力的减弱.
A series of Cs partially substituted Ni-Csx H3-x PW12O40 / SiO2 catalysts were prepared by two-step impregnation method and in situ reaction on support. The BET surface area, BET, ICP, , XRD, Raman, in situ XRD, NH3-TPD, H2-TPR, H2-temperature programmed desorption (H2-TPD) and pyridine adsorption-Fourier transform infrared (FTIR) spectroscopy were used to characterize the catalysts.The hydrocracking performance of the catalyst was evaluated using n-decane as a model compound.The results showed that , The highest C5 + yield of 8% Ni-50% Cs1.5H1.5PW / SiO2 catalyst is obviously better than that of 8% Ni-50% H3PW / SiO2 catalyst and industrial catalyst.With the ratio of Cs in Csx H3-x PW , The conversion of n-decane gradually decreases, while the selectivity of C5 + increases gradually.When the catalyst has a suitable pore size, the selectivity increase is due to the weakening of the acidity of the catalyst, while the reduction of the conversion is due to the hydrogenation of the catalyst Weakened ability.