表面活性剂辅助溶胶-凝胶法制备掺Ba纳米MgO及其负载钌基氨合成催化剂

在表面活性剂聚乙二醇（PEG）、聚丙烯酸钠（PAAS）、聚乙烯醇（PVA）的辅助下，采用溶胶-凝胶法制备了一系列掺Ba纳米MgO及其负载的氨合成Ru催化剂。并采用场发射扫描电镜、X射线粉末衍射、N2物理吸附-脱附、X射线能谱仪对样品进行表征。结果表明：表面活性剂的添加可改善掺Ba纳米MgO的织构性质和表面性质，并增强钡、镁之间的相互作用，促使了钡在载体中的分散。其中，在10 MPa、425 ℃、10000 h－1的测试条件下，添加5%的PAAS时制得的2%Ru/Ba-MgO催化剂出口氨生成速率达65.9 mmol/(g?h)。

Catalytic performance of Ru catalyst supported on Ba-doped nano-magnesia prepared by sol-gel method with the assistance of surfactant for ammonia synthesis

A series of Ba-doped nano-magnesia were prepared by sol-gel method with the assistance of polyethylene glycol(PEG)，sodium polyacrylate(PAAS) and polyvinyl alcohol(PVA)，and the corresponding Ru catalysts for ammonia synthesis were then prepared by the impregnation method. The catalysts were characterized by scanning electronic microscopy，X-ray diffraction，nitrogen physical adsorption，X-ray energy dispersive spectrometer. The results showed that the surfactants not only improved the texture and surface physical and chemical properties of the Ba-MgO support，but also enhanced the dispersion of Ba in the support. When the dosage of PAAS was 5%，the Ru/Ba-MgO catalyst exhibited the highest catalytic activity for ammonia synthesis with a reaction rate of 65.9 mmol/(g?h) at 425 ℃，10 MPa，and 10000 h―1.