制备方法对BaNi0.2Mn0.8Al11O19－δ催化燃烧二甲醚的催化活性的影响

Catalytic combustion of dimethyl ether （DME） over hexaaluminate catalyst BaNi0.2Mn0.8Al11O19-δ has been investigated. The catalysts were prepared with the sol-gel method and reverse microemulsion method respectively and characterized by thermogravimetry-differential thermal analysis, X-ray diffraction and transimission electron microscope. It was found that the formation of Mn, Ni modified hexaaluminate was a relatively slow process via two solid state reactions and spinel structure was a transition phase. At the same calcined temperature and time, the catalyst prepared with the reverse microemulsion method could form the hexaaluminate phase more easily than that prepared with the sol-gel method. The catalyst BaNi0.2Mn0.8Al11O19-δ prepared with the reverse micro-emulsion method appeared a plate-like morphology, while it appeared a needle-like morphology when using the sol-gel method. The catalytic activities of catalysts BaNi0.2Mn0.8Al11O19-δ prepared with two different methods for DME combustion were tested. It showed that catalyst prepared with the reverse microemulsion method had better catalytic activity, i.e. T10% of DME had decreased by 45℃, about 90% conversion of diemthyl ether at 380℃.     

改性丙烯酸酯金属防腐蚀涂料的研究进展

综述了丙烯酸酯防腐蚀涂料用有机硅改性、环氧树脂改性、有机氟改性、有机硅/环氧树脂改性以及纳米材料改性的研究情况,并指出了丙烯酸酯防腐蚀涂料的应用现状、存在的问题以及发展趋势。     

间甲酚烷基化合成麝香草酚的研究进展

综述了国内外合成麝香草酚的研究进展,指出了间甲酚烷基化合成麝香草酚方法的优缺点,并对用于间甲酚异丙基化反应的催化剂进行了一些探讨,发现介孔分子筛是比较理想的催化剂.     

二甲醚催化燃烧研究的进展

介绍了近年来二甲醚作为一种清洁能源的研究状况，进行了二甲醚的催化燃烧研究的初探。通过对贵金属、金属氧化物和六铝酸盐等催化剂应用于二甲醚催化燃烧的比较，发现六铝酸盐最具研究应用前景。     

二甲醚燃烧用催化剂BaO·MnO·6Al_2O_3的热分解动力学

采用反相微乳法制备和超临界干燥获得前驱体BaO.MnO.6Al2O3。利用TG-DTA曲线和XRD分析对前驱体的热分解过程进行研究,并用Coats-Redfern法和Kissinger法进一步研究前驱体的热分解动力学,获得六铝酸盐催化剂前驱体热分解的机制函数为:积分式G(α)=[-ln(1-α)]4,微分式为:f(α)=(1/4)(1-α)[-ln(1-α)]-3,反应为随机成核和随后生长控制,计算出的活化能Ea=187.80kJ.mol-1。     

反相微乳法制备锆锰掺杂六铝酸盐催化剂的研究

利用三相图确定了稳定的OP-10乳化剂/正丁醇/环己烷/水反相微乳体系,并采用反相微乳法和超临界干燥技术制备了纳米锆锰掺杂六铝酸盐催化剂.X射线衍射(XRD)、透射电子显微镜(TEM)、比表面积(BET)和氢气程序升温还原(H2-TPR)对锆锰掺杂六铝酸盐进行表征.分析结果表明,催化剂制备的最佳焙烧条件为1 050℃,焙烧4 h,比表面积为78.185 m2/g,颗粒分散均匀,主要形状为片状,粒度在10 nm-30 nm.     

制备方法对BaNi0.2Mn0.8Al11O19-δ催化燃烧二甲醚的催化活性的影响

Catalytic combustion of dimethyl ether (DME) over hexaaluminate catalyst BaNi0.2Mn0.8Al11O19-δ has been investigated. The catalysts were prepared with the sol-gel method and reverse microemulsion method respectively and characterized by thermogravimetry-differential thermal analysis, X-ray diffraction and transimission electron microscope. It was found that the formation of Mn, Ni modified hexaaluminate was a relatively slow process via two solid state reactions and spinel structure was a transition phase. At the same calcined temperature and time, the catalyst prepared with the reverse microemulsion method could form the hexaaluminate phase more easily than that prepared with the sol-gel method. The catalyst BaNi0.2Mn0.8Al11O19-δ prepared with the reverse micro-emulsion method appeared a plate-like morphology, while it appeared a needle-like morphology when using the sol-gel method. The catalytic activities of catalysts BaNi0.2Mn0.8Al11O19-δ prepared with two different methods for DME combustion were tested. It showed that catalyst prepared with the reverse microemulsion method had better catalytic activity, i. e. T10% of DME had decreased by 45℃, about 90% conversion of diemthyl ether at 380℃.