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使用浸涂法和氨气吸收沉积法制备了新型用于苯选择加氢的具有蛋壳型分布的Ru/Al2O3-ZrO2-NiO/堇青石蜂窝整体催化剂,且在固定床整体反应器中对其性能进行了测试. 该催化剂显示了较优的选择性和稳定性,并且在低的ZnSO4浓度(0.5%问题)下环己烯产物收率可达24.7%. 采用N2吸附-脱附法,电感耦合等离子体发射光谱,光学显微镜,扫描电子显微镜及能量色散X射线光谱仪等技术研究了影响催化剂性能的因素. 结果表明,NiO的引入减少了涂层中的微孔含量,有利于在低的添加剂浓度下提高环己烯选择性. ZrO2的存在抑制了涂层的烧结,保证涂层在1373K高温焙烧后仍有较大的比表面积. Ru的蛋壳分布、薄的涂层厚度、较少的微孔含量、较大的比表面积和狭窄的孔分布可能是影响整体蜂窝催化剂中该特殊催化行为的重要因素.
A new type of Ru / Al2O3-ZrO2-NiO / cordierite honeycomb monolith catalyst with eggshell distribution for the selective hydrogenation of benzene was prepared by dip-coating and ammonia absorption deposition. The catalyst was immobilized on a fixed bed reactor The catalyst showed good selectivity and stability, and the yield of cyclohexene was 24.7% at low concentration of ZnSO4 (0.5% problem). Using N2 adsorption-desorption method, the inductance Coupled plasma emission spectroscopy, optical microscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy were used to study the factors affecting the catalyst performance.The results showed that the introduction of NiO reduced the micropore content in the coating, Concentration increases the selectivity of cyclohexene ZrO2 presence inhibits the sintering of the coating to ensure that the coating has a larger specific surface area after calcination at a high temperature of 1373 K. The shell distribution of Ru, thin coating thickness, less Micropore content, larger specific surface area and narrow pore distribution may be important factors that influence this particular catalytic behavior in the overall honeycomb catalyst.