摘要:
The material of the present invention is a mixture of catalytically active material and carrier materials, which may be catalytically active themselves. Hence, the material of the present invention provides a catalyst particle that has catalytically active material throughout its bulk volume as well as on its surface. The presence of the catalytically active material throughout the bulk volume is achieved by chemical combination of catalytically active materials with carrier materials prior to or simultaneously with crystallite formation.
摘要:
The present invention is a method of making a first solid composite polymer layer. The method has the steps of (a) mixing a liquid monomer with particles substantially insoluble in the liquid monomer forming a monomer particle mixture; (b) flash evaporating the particle mixture and forming a composite vapor; and (c) continuously cryocondensing said composite vapor on a cool substrate and cross-linking the cryocondensed film thereby forming the polymer layer.
摘要:
An improved method for the formation of composite hydroxides or oxides comprising, on an oxide basis, Al2O3 and ZrO2, and optionally CeO2, La2O3, Nd2O3, Pr6O11, Sm2O3, Y2O3, and other rare earth oxides, comprising the steps of preparing an aqueous metal salt solution and forming a hydroxide precipitate slurry by combining the aqueous metal salt solution with an aqueous solution of a caustic alkali at a pH greater than 8.5 to precipitate out all the metal species. The variation in pH during the precipitation reaction is ±1. The invention also relates to composites formed by this method comprising 20-70 wt % Al2O3, 10-77 wt % ZrO2, 0-34 wt % CeO2 and 0-22 wt % REOs other than CeO2, and to composites per se comprising, on an oxide basis, 42-70 wt % Al2O3, 10-48 wt % ZrO2, 2-34 wt % CeO2 and 0-9 wt % REOs other than CeO2 and having the following properties after heating to 850° C. over four hours and holding at 850° C. for four hours then allowing to cool to ambient temperature: —a surface area after aging at 950° C. for 2 hours equal to or greater than 60 m2/g, and —a surface area after aging at 1100° C. for 2 hours equal to or greater than 30 m2/g.
摘要翻译:一种用于形成复合氢氧化物或氧化物的改进方法,其包含以氧化物为基准的Al 2 O 3和ZrO 2以及任选的CeO 2,La 2 O 3,Nd 2 O 3,Pr 6 O 11,Sm 2 O 3,Y 2 O 3和其它稀土氧化物,包括以下步骤: 盐溶液,并通过将金属盐水溶液与pH大于8.5的苛性碱水溶液组合形成氢氧化物沉淀物浆料,以沉淀所有金属物质。 沉淀反应中pH值的变化为±1。 本发明还涉及通过该方法形成的复合材料,其包含20-70重量%的Al 2 O 3,10-77重量%的ZrO 2,0-34重量%的CeO 2和除CeO 2之外的0-22重量%的REO,以及本身的复合材料本身包括 氧化物基,42-70重量%的Al 2 O 3,10-48重量%的ZrO 2,2-34重量%的CeO 2和0-9重量%的除CeO 2之外的REO,并且在四小时内加热至850℃后具有以下特性; 在850℃下保持4小时,然后冷却至环境温度: - 在950℃老化2小时之后的表面积等于或大于60m 2 / g, - 在1100℃老化后的表面积 ℃2小时等于或大于30m 2 / g。