Egg shell type metal catalyst, its preparing process and application method

A metal catalyst, eggshell-type technology, applied in the field of eggshell-type metal catalysts

Inactive Publication Date: 2006-02-22
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And with hollow SiO 2 Eggshell-type catalysts for supporting metal active components, and their use in the hydrogenation of CO to produce methanol, have not been reported yet.

Method used

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  • Egg shell type metal catalyst, its preparing process and application method
  • Egg shell type metal catalyst, its preparing process and application method
  • Egg shell type metal catalyst, its preparing process and application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The cubic nano-calcium carbonate prepared by the super-gravity engineering research center of the Ministry of Education of Beijing University of Chemical Technology was prepared into a suspension with a concentration of 0.8mol / L, and 1000mL of the nano-calcium carbonate suspension was placed in the reactor and started to heat Warming up and stirring, the stirring speed is controlled at 400-500r / min; 500mL of sodium silicate solution with a concentration of 0.68mol / L and 10wt% dilute hydrochloric acid solution are prepared. When the temperature rises to 80°C, start to add sodium silicate solution, and add dilute hydrochloric acid at the same time, adjust the pH of the system between 8.5 and 9.5, and generate CaCO 3 / SiO 2 Core-shell structural materials. After all the sodium silicate solution is added dropwise into the system, stop adding acid, and stir and age at this reaction temperature, and the aging time is controlled at 4h, so that the SiO 2 in CaCO 3 Surface de...

Embodiment 2

[0044] The needle-shaped nano-calcium carbonate prepared by the high-gravity technology of the Beijing University of Chemical Technology High Gravity Engineering Research Center is formulated into a suspension with a concentration of 0.8mol / L, and 1000mL of the nano-calcium carbonate suspension is placed in the reactor and stirred. Stirring speed is controlled at 400~500r / min; according to SiO 2 / CaCO 3 The ratio of mass ratio is 0.2. Weigh 26.7g of tetraethyl orthosilicate (containing Si mass fraction is 28%) and dissolve it with ethanol, add the ethanol solution of tetraethyl orthosilicate to the calcium carbonate slurry, and then add 100mL of 17wt% concentrated ammonia water, stirred at room temperature for 12h. After the reaction, the slurry was filtered and washed, dried at 105°C for 12 hours, crushed and sieved with a 250-mesh standard sieve, and then calcined in a muffle furnace with a heating rate of 4°C / min and a calcining temperature of 600-700°C. Time 6h. Dissolv...

Embodiment 3

[0046] Weigh 0.1666g PdCl 2 For solid powder, add 10mL deionized water and 10mL 35% concentrated hydrochloric acid, shake well, heat to dissolve, and heat to boiling until the solution becomes clear and transparent. PdCl 2 Solution is cooled to room temperature, takes by weighing 2g spherical hollow SiO prepared by embodiment 1 2 carrier, added to PdCl 2 In the solution, stir and dip at the same time. The stirring time is 12h, the loading temperature is controlled at about 35°C, then vacuum filtration is performed and washed to remove unloaded Pd 2+ , the filtered filter cake was dried at 120°C, the heating rate was 10°C / min, and the drying time was 12h. The dried powder is sieved with a 250-mesh standard sieve, and the sieved powder is calcined at a temperature of 450 °C, a heating rate of 1 °C / min, and a calcining time of 6 h, and the mass fraction of Pd loaded can be obtained as 3.35% eggshell type precious metal palladium catalyst. image 3 is a TEM photograph of the...

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Abstract

The invention discloses an egg- shell metallic catalyst and the method for preparation and the application. The catalyst is an egg- shell supported metallic catalyst with a carrier of hollow silica dioxide, which is a hollow material of certain wall and bore diameter, and comprises a noble metal of 0.1%- 5.0% and / or a transient metal of 5.0%- 40.0%, a non- noble metallic catalyst promoter of 0- 0.5% and a hollow silica dioxide carrier of 60.0%- 99.0%, with the weight ratio of catalyst as a datum level. The egg- shell metallic catalyst can prepare with immersion method or in- situ supporting method. The catalyst has good metal dispersibility, and the metal particle diameter is minor, dispersing on the external surface, inner surface and in the pore passage. And the egg- shell metallic catalyst can catalyze CO and CO2 to prepare lower carbon number hydrocarbons and alcohol, and it also can catalyze olefin and alkyne selectively.

Description

technical field [0001] The invention relates to an eggshell metal catalyst, in particular to an eggshell metal catalyst with silicon dioxide as a carrier, a preparation method thereof and an application in catalytic hydrogenation reaction. Background technique [0002] Supported noble metal catalysts are widely used in selective catalytic hydrogenation reactions in petrochemical industry, such as selective catalytic hydrogenation of diolefins or alkynes to prepare monoolefins, etc. This type of reaction has the characteristics of fast reaction speed and many side reactions. The target product is often an intermediate product, and deep hydrogenation is not expected. Theory and practice have fully demonstrated that for this type of catalytic reaction process, when the total amount remains unchanged, the catalyst and the active component of the catalyst with a non-uniform distribution of the noble metal active component (such as eggshell type, egg yolk type) and the active comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/02B01J37/02B01J23/60B01J23/89
Inventor 陈建峰宋继瑞邵磊王洁欣文利雄
Owner BEIJING UNIV OF CHEM TECH
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