Alumina carrier, preparation method thereof, silver catalyst for ethylene epoxidation reaction and method for preparing ethylene oxide from ethylene by epoxidation
An alumina carrier, silver catalyst technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem that the comprehensive performance of silver catalyst needs to be improved, and achieve Effects of selective improvement, good overall performance
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[0028] According to the first aspect of the present invention, the present invention provides a method for preparing an alumina carrier, the preparation method comprising: 1) adding a binder to the solid mixture for kneading and extrusion molding to obtain a sample green body; 2) The sample green body is dried and calcined to obtain the alumina carrier; wherein, based on the total weight of the solid mixture, the solid mixture includes:
[0029] a) 5-50% by weight of trihydrate α-A1 with a particle size of 25-300 μm 2 o 3 ;
[0030] b) 10-35% by weight of fake monohydrate A1 with a particle size of less than 75 μm 2 o 3 ;
[0031] c) 5-45% by weight of α-A1 with a particle size of 20-100 μm 2 o 3 ;
[0032] d) 10-20% by weight of α-A1 with a particle size of 3-8 μm 2 o3 ;
[0033] e) 2.0% to 15% by weight of burnable lubricating materials;
[0034] f) 0.01 to 1.5% by weight of zirconium-containing compounds;
[0035] g) 0.01 to 0.5% by weight of silicon-containing c...
Embodiment approach
[0076] According to one embodiment, the silver catalyst is prepared by the following method:
[0077] 1) impregnating the above-mentioned alumina support with a solution containing a sufficient amount of silver compounds, organic amines, alkali metal promoters, alkaline earth metal promoters, rhenium-containing promoters and optional co-promoters;
[0078] 2) filtering off the impregnation solution, and drying the impregnated support; and
[0079] 3) activating the impregnated carrier in an oxygen-containing mixed gas to obtain the silver catalyst.
[0080] In step 1), specifically, the silver compound (such as silver oxalate) can be dissolved in an aqueous solution of an organic amine (such as ethylenediamine and / or ethanolamine) to generate a silver amine complex, and then mixed with the above-mentioned alkali metal and other additives Dubbed the dipping solution.
[0081] In step 3), the purpose of activation is to thermally decompose the product to make a finished silver...
Embodiment 1
[0093] This example is used to illustrate the alumina carrier of the present invention and its preparation method.
[0094] Dilute 25-300μm trihydrate α-A1 2 o 3 300g, less than 75μm fake monohydrate A1 2 o 3 200g, α-A1 with a particle size of 20-100μm 2 o 3 50g, 3~8μm α-A1 2 o 3 100g, petroleum coke 50g, calcium silicate 2.0g, zirconium dioxide 2.5g, boric acid 2.5g are put into the mixer and mix evenly, transfer to the kneader, add 120mL dilute nitric acid (nitric acid: water=1: 3, weight Ratio), kneaded into a paste that can be extruded. It is extruded into a single-hole column with an outer diameter of 8.0mm, a length of 6.0mm, and an inner diameter of 3.0mm, and is dried at 80-120°C for more than 2 hours to reduce the free water content to below 10%. Put the above kneaded carrier into a bell kiln, raise it from room temperature to 1350°C over 33 hours, and calcinate at 1350°C for 5 hours to obtain white α-A1 2 o 3 carrier. The carrier physical properties an...
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