摘要:
Granules based on silicon dioxide and having the properties: Average particle size: 10 to 120 .mu.m BET surface area: 40 to 400 m.sup.2 /g Pore volume: 0.5 to 2.5 ml/g Pore size distribution: less than 5% of the total pore volume exists of pores with a diameter
摘要:
A product obtained by treating surface-modified, pyrogenically produced titanium dioxide with at least one ammonium-functional silane, such as by spraying the pyrogenically produced titanium dioxide with the at least one silane, alone or in ethanol solution, and tempering, and useful in the field of cosmetics in sunblocks, in toner powders, in paints and varnishes, in silicone rubber, as abrasives and polishes, for example, in the field of CMP.
摘要:
Molded articles based on pyrogenically prepared aluminum oxide and having the following physical-chemical characteristic data:______________________________________ External diameter: 2 to 15 mm BET surface area: 60 to 115 m.sup.2 /g Total Pore volume: 0.30 to 0.80 ml/g Crushing strength: 100 to 300N Pore size distribution: no pores
摘要翻译:基于热解法制备的氧化铝并具有以下物理化学特性数据的成型制品:外径:2至15mm -BET表面积:60至115m2 / g - 总孔体积:0.30至0.80ml / g - 冲洗 强度:100〜300N - 孔径分布:直径不大于5nm的孔径, - 直径为10〜40nm范围的至少80%。 - 组合物:94〜99重量%的Al 2 O 3 - 剩余SiO 2。 - 它们是通过用高岭土和/或石墨,尿素,蜡,糖或淀粉加热水均匀化热解法制备的氧化铝来制备的,在80-120℃的温度下干燥该混合物,并将其粉碎形成 粉末,压制粉末以形成成型体,并通过在400℃至1200℃的温度下加热回火成型体0.5至6小时。 模制品可用作催化剂载体或催化剂。
摘要:
A process for making gluconic acid and its alkali metal salts by oxidizing glucose with oxygen or oxygen containing gas in an aqueous alkaline solution in the presence of an activated charcoal supported catalyst containing a platinum group metal component, e.g. platinum and palladium and bismuth wherein the platinum, palladium and bismuth are simultaneously deposited on the charcoal support.
摘要:
The use of hitherto known supported catalysts in chlorination processes and oxychlorination processes leads to high pressure drops and to the formation of hot spot temperatures in the reactor. When honeycomb monolithic catalyst supports provided with a multiplicity of channels open at both ends and parallel to the longitudinal axis are used, both the heat dissipation is improved and the pressure drops across the reactor are lowered drastically. This leads ultimately to an increase in the selectivity of the reaction and to a minimization of the combustion rate.
摘要:
Molded articles based on pyrogenically prepared silicon dioxide and having the following physical-chemical characteristic data:______________________________________ External diameter 2 to 15 mm BET surface area 50 to 400 m.sup.2 /g Total Pore volume 0.6 to 1.3 ml/g Crushing strength 40 to 120 N Pore size distribution no pores 95% by weight of SiO.sub.2 remainder Al.sub.2 O.sub.3. ______________________________________ These products are produced by compacting pyrogenically prepared silicon dioxide with kaolin and/or graphite, sugar, starch, urea or wax with addition of water, drying the mixture at a temperature of from 80.degree. to 120.degree. C. and comminuting it to form a powder, pressing the powder to form the desired article, and tempering the articles at a temperature of from 400.degree. to 1200.degree. C. for a period of 0.5 to 6 hours. The molded bodies can be used as a catalyst support or catalyst.
摘要:
A carrier catalyst containing copper and alkali ions on an annular carrier of surface-active material is defined by the dimensions of the carrier body and the porosity of the finished catalyst. Its total pore volume is 0.6-1.0 ml/g, pores smaller than 4 nm diameter are not present, pores of 8-20 nm diameter constitute at least 80% of the total pore volume and the remainder consists of macropores with a diameter greater than 20 nm (i.e., up to 200 nanometers). The catalyst is suitable for the production of 1,2-dichloroethane by means of the oxychlorination of ethylene.
摘要:
A molded; i.e. pressed, article based on a pyrogenically produced system of mixed oxides of silicon dioxide and aluminum oxide and having the following physical-chemical features:______________________________________ pellet diameters 2 to 15 mm BET surface area according to 90 to 200 m.sup.2 /g DIN 66131 pore volume 0.6 to 1.3 ml/g pore size distribution no pores with 75% by weight of SiO.sub.2, remainder Al.sub.2 O.sub.3 ______________________________________ These molded articles are manufactured by homogenizing a pyrogenically produced system of mixed oxides of silicon dioxide and aluminum oxide with graphite and/or kaolin, urea, sugar, starch, glaze frit powder and/or microcrystalline wax while water is being added, by drying the mixture at a temperature between 80.degree. and 120.degree. C. and then comminuting it into a powder that next is pressed into molded articles and then is annealed for 0.5 to 6 h at a temperature between 400.degree. and 1050.degree. C. The molded articles are used as catalyst-supporters or as catalysts.
摘要翻译:成型; 即基于由二氧化硅和氧化铝的混合氧化物产生的热解产生体系的物品,具有以下物理化学特征: - 直径2至15mm -BET表面积,根据90至200m 2 / g -DIN 66131 - 孔体积0.6至1.3ml / g - 孔径分布无5- 5nm直径的孔,至少75%的孔在5至40nm的范围内 - 冲击强度30至120N-组成> 75 SiO 2重量%,余量为Al 2 O 3。这些模塑制品通过将石英和/或高岭土,尿素,糖,淀粉,釉料粉末和/或微晶的二氧化硅和氧化铝的混合氧化物的热解产生体系均质化 通过在80〜120℃的温度下干燥混合物,然后将其粉碎成粉末,然后将其压制成模制品,然后在400℃的温度下退火0.5至6小时,同时加入水 DEG和1050℃ 颗粒用作催化剂载体或催化剂。
摘要:
Shaped, activated Raney metal fixed-bed catalysts are obtained by molding a powder of at least one catalyst alloy, comprising at least one Raney process metal as catalytically active component and a leachable alloy component, and a powder of pure Raney process metal as binder with the addition of a shaping aid and pore-producer and subsequent calcination at temperatures below 850.degree. C. During calcination the shaping aid and pore-producer are burned away. Catalyst alloy powder and binder powder thereby sinter together to give a mechanically stable and porous molded item. This molded item thus consists of particles of catalyst alloys which are bonded by the powder of pure Raney process metal. It has no catalytically inactive, ceramic or glassy binder. The surface layer of the molded item is activated by leaching the leachable alloy component contained in the catalyst alloys with caustic soda solution.
摘要:
Pressed parts based on pyrogenically produced titanium dioxide with the following physico-chemical characteristics:______________________________________ Outer diameter 0.8-15 mm BET surface according 99.5% TiO.sub.2 ______________________________________ They are produced by mixing pyrogenically produced titanium dioxide with urea, graphite and water, compacting the mixture, optionally drying the resulting mass at 80.degree. C. to 120.degree. C. comminuting, subsequently extruding or tabletting to produce pressed parts and tempering the pressed parts at a temperature of 710.degree. C. to 1000.degree. C. for a period of 0.5 to 6 hours. The pressed parts can be used as catalyst or catalytic carrier.