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:
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:
Pressed parts based on pyrogenically produced silicon dioxide with the following physicochemical characteristic data:______________________________________ Outer diameter 2 to 15 mm BET surface 50 to 400 m.sup.2 /g Pore volume 0.6 to 1.3 ml/g Breaking strength 50-150 N Pore distribution no pores 99% by weight SiO.sub.2 Abrasion
摘要:
A catalyst containing platinum on carbon as carrier for the catalytic oxidation of glyoxal to glyoxalic acid. Activity and selectivity of the catalyst can be considerably improved by modification with molybdenum and/or cerium.
摘要:
Compacts produced from a pyrogenically produced oxide, magnesium stearate, methyl cellulose and urea are mixed together in the presence of water, compacted, dried, comminuted to a powder, and the powder is pressed with an isostatic press to compacts and the compacts tempered. The resulting compacts have an outside diameter of 16 to 100 mm.
摘要:
Molded, or pressed articles on pyrogenically produced zirconium dioxide are disclosed and having the following features:______________________________________ outside diameter 2-15 mm BET surface area per DIN 66 131 30-50 m.sup.2 /g total pore volume 0.3-0.8 ml/g pore size distribution no pores
摘要翻译:公开了在热解制备的二氧化锆上的成型或压制制品,具有以下特点: - 外径2-15mm -BET表面积/ DIN 66 131 30-50m2 / g-总孔体积0.3-0.8ml / g - 孔径分布无孔<10nm,在-10-70nm直径范围内至少80%的孔隙 - 冲击强度40-300N-组成至少98%的ZrO 2,SiO 2,剩余的Al 2 O 3和 /或 - HfO 2。 - 这些模塑制品通过在80至120℃的温度下干燥该混合物,通过在加入水的同时,将任何一种高岭土,糖或尿素或混合物中的热解产生的二氧化锆均质化,然后粉碎 成为易碎粉末,然后将其压制成模制品,随后在600℃至1000℃退火1至4小时。压制制品用作催化剂或作为催化剂载体。
摘要:
The invention concerns pressed pellets based on pyrogenically produced titanium dioxide having the following properties:______________________________________ outside diameter 2 to 15 mm area according to BET surface 35 to 65 m.sup.2 /g DIN 66 131 Total pore volume 0.3 to 0.8 m.sup.3 /g crushing strength 40 to 300 N pore size distribution no pores 50% by weight of anatase) remainder SiO.sub.2 and Al.sub.2 O.sub.3. ______________________________________ They are made by mixing pyrogenically produced titanium with a foaming agent such as urea and with water, where called binder such as kaolin and also with a binder such as kaolin and also with a pelletizing accessory such as wax and by compacting the material which then is dried at a temperature of 80.degree. to 120.degree. C. and is comminuted into a powder which then is pressed by known means and the pressed articles are annealed for 0.5 to 4.5 h at a temperature of 400.degree. to 600.degree. C. The pressed articles are used as catalyst-carriers or as catalysts.
摘要:
A sulphidized catalyst which contains platinum on activated carbon is described. The activity of the catalyst can be greatly improved, while retaining the same selectivity, when the platinum-containing impregnation solution contains an oxidizing agent.
摘要:
A process is described for preparing hydrogenation catalysts which contain noble metals, having at least one catalytically active component and optionally promoters and/or modifiers on a support consisting of activated carbon washed with nitric acid. The activated carbon is subjected to an oxidative pretreatment with an oxidizing agent before applying the catalytically active components, promoters and modifiers.