DE706826C - Process for making shaped catalysts - Google Patents

Description

For carrying out catalytic reactions

It is often desired to use a shaped catalyst which has high activity has and under the working conditions

S retains its shape.

According to the invention, such catalysts can easily be obtained if one is catalytically acting metal compounds in powder form with water, aqueous solutions or

ίο low-boiling organic liquids, like gasoline and benzene, mixed together, the moist mass by expelling liquid underneath Heating converted into grindable form, then ground and after adding the same or another metal compound in a state that has not been pretreated in this way and, if applicable presses a liquid of the type mentioned into pieces of a certain shape. The catalysts can be subjected to an activating post-treatment.

Any metal compounds, ζ. B. the oxides, sulfides, carbonates, phosphates of metals, in particular of molybdenum, tungsten, chromium, titanium, vanadium, manganese, iron, cobalt, nickel and the like., Can be used. These are comminuted, expediently up to a particle size of V ₃ to Vio ^ram .> ^{Un (} i then stirred or kneaded with a liquid, e.g. water, for some time. An amount of liquid of at least 20% is advantageously chosen 3 ο 0/0, based on the metal compound; in general, one does not go beyond 100 0/0 In addition to water, aqueous metal salt solutions, dilute acids or organic liquids such as gasoline, benzene and the like can be used as liquids. The pulpy or moist mass produced in this way is then exposed to an elevated temperature, depending on the boiling point of the liquid present, until it has been completely or partially removed, for example up to an amount of 2 to 10% is then ground, for example up to a grain size of 3 mm, and advantageously a further liquid is added to the corn. The amount of liquid is measured in such a way that only that required for mechanical pressing che sliding ability of the mass is achieved. One uses mainly water or z. B. Gasoline. The addition of liquid is only appropriate if the ground mass no longer contains a sufficient amount of the liquid added first or if it is desired to use a different liquid, or if, in addition to the solid substance to be added, there is also a dissolved substance

*) The patent seeker indicated the following as the inventors:

Dr. Mathias Pier in Heidelberg and Dr. Eugen Anthes in Ludwigshafen, Rhine.

Claims (1)

Form should be added. The ground mass will be the same metal compound or other metal compounds that do not result from the pretreatment described-S were set, admitted. The mass is then pressed into desired shapes, e.g. pills, cubes, spheres, stars, etc., by means of mechanical presses; one can also create a strand which is then broken. The shaped pieces can then be treated with gases such as hydrogen, water vapor, Nitrogen .. carbon oxides and the like, optionally further activated at elevated temperature 'Become 5. The present catalysts can, for example, in the cleavage and hydrogenation of carbonaceous Substances for gas cleaning and the like can be used with advantage. Of known processes for the production of shaped catalysts, using metal compounds are converted into homogeneous masses by mechanical treatment, the method differs according to the present one Invention in that the milled in the manner described and at least partially dried catalyst mass before compression molding solid substances of the same or in some other way. It was already known that catalysts can be prepared by using metal oxides heated with the addition of tar and coal as reducing agents, the product obtained ground and after mixing with another amount of tar and coal up heated to sinter the metals; this is where the carbonaceous reducing agents are used consumed. On the other hand, in the present case there is a completely wrong 1 «different procedure than heating only to relatively low temperatures in order to expel the moisture is carried out, a reduction of the metal compounds practically not taking place; the additives made after grinding also remain in the catalyst. "It will thus obtained by the present process catalysts of a completely different type than according to the citation. Apart from that by the different chemical The nature of the catalysts must have a different catalytic effect due to the nature of the catalyst Catalysts presented according to the present process therefore already have a further one Field of application are awarded because of the catalytic effectiveness of catalysts in many cases by heating to too high a temperature, e.g. B. on sinter! temperature, is significantly affected. j It was also known in the production j of catalysts on gelatinous supports to combine various work processes also used in the present case. A guide to converting powdery masses into one that is too mechanical durable molds of high catalytic efficiency, however, moldable shape was that State of the art cannot be found. The addition of solid substances after grinding, but before pressing, has the great advantage that the effectiveness of the catalyst is greater and more permanent and its mechanical strength is better than if this measure is omitted or if the additive, if it is a different ^7S than the originally used metal compound is added from the start. example '. One from molar quantities of molybdenum; Powder consisting of acid, zinc oxide and magnesium oxide is mixed well with half the volume of water. The one with it; The resulting dough-like mass is spread out on baking sheets and dried at 120 'for so long! net until it only contains 10% water. The solid mass is then crushed and ground to a powder. This is mixed with ιo ° ü of the dry powder mentioned at the beginning. 10 to 130/0 water is sprayed onto this mixture with good distribution. The resulting mass is then pressed into shapes in tablet machines. ⁹ p Ρλ τ ε ν τ λ ν s ρ r υ c ιι: Process for the production of shaped catalysts by mechanical pressing, characterized in that ^lo ° metal compounds in powder form are stirred with water, aqueous solutions or low-boiling organic liquids such as gasoline and benzene, and the moist mass is converted into grindable form by expelling liquid with heating, then ground and, after the addition of the same or a different metal compound in a state not pretreated in this way and optionally a liquid of the type mentioned, is pressed into pieces of a certain shape. r, F.Dnc <: Kr i \ nr: i (