Materials comprising carbon-embedded nickel nanoparticles, process for the production thereof and use
A technology of nickel nanoparticles and catalytically active materials, which is applied in the field of vati and materials, can solve the problem of not being able to produce transition metal nanoparticles/metal oxide nanoparticles with high dispersion and uniform coordination and high metal content.
Pending Publication Date: 2022-04-12
EVONIK OPERATIONS GMBH
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Problems solved by technology
However, the interaction of nanoparticles and carriers was found to pose significant limitations (Oschatz, M. et al.: “Effects of calcination and activation conditions on ordered mesoporous carbon supported iron catalysts for production of lower olefins from synthesis gas” Catalysis Science & Technology (2016). )
In particular, prior art methods fail to produce materials exhibiting high dispersion and uniform coordination of transition metal nanoparticles / metal oxide nanoparticles and high metal content
Method used
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[0113] The preparation of the Ni nanoparticle (carbon embedded Ni-nanoparticles) of embodiment Ni a, b-carbon embedding
[0114] Carbon-intercalated Ni nanoparticles were prepared by dissolving 14.4 g of citric acid (puriss, Sigma Aldrich) in 75 mL of deionized water with continuous stirring at room temperature. In a second beaker, 18.7 g of nickel(II) acetate tetrahydrate (Ni(CH 3 COO) 2 *4H 2 O, Sigma Aldrich) was dissolved in 75 mL deionized water. The nickel acetate solution was slowly added to the citric acid solution and stirred for another 30 minutes at room temperature. The resulting solution was spray dried with a conventional mini spray dryer (Büchi, Mini Spray Dryer B-290) with a constant inlet temperature of 220°C, an outlet temperature of 120°C and a pump speed of 20%. The obtained powder is divided into two parts of equal mass for final heat treatment.
[0115] The first sample was heat-treated in a tube furnace under a nitrogen atmosphere with a 180-minute ...
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Abstract
The present invention relates to a catalytically active material comprising particles of non-graphitized carbon in which nickel nanoparticles are dispersed wherein the nickel nanoparticles in the non-graphitized carbon particles have an average diameter dp in the range of 1 nm to 20 nm and an average distance D between the nickel nanoparticles in the non-graphitized carbon particles is in the range of 2 nm to 150 nm, the combined total mass fraction omega of metals in the non-graphitized carbon particles is in the range of from 30% by weight to 70% by weight of the total mass of the non-graphitized carbon particles, wherein dp, D and omega comply with the following relationship: 4.5 dp / omega gt; d > = 0.25 dp / omega. The invention also relates to a method for producing the material according to the invention and to the use thereof as a catalyst.
Description
Background technique [0001] The present invention relates to a material comprising grains of non-graphitizable carbon having nickel nanoparticles dispersed therein. The materials according to the invention are catalytically active in a wide variety of chemical reactions and can be obtained by simple methods. [0002] The carbon phase of the present invention is predominantly amorphous and does not appear to be activated carbon, carbon black, graphite, graphitized carbon black, or paracrystalline carbon. [0003] current technology [0004] A large amount of prior art is directed towards the synthesis of transition metal nanoparticles, especially including transition metal nanoparticles with catalytic activity. However, since nanoparticles by themselves cannot be used for most heterogeneous catalytic processes, further efforts have been made to develop materials containing transition metal nanoparticles attached to suitable supports, substrates or wafers. Prior art methods f...
Claims
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IPC IPC(8): B01J23/755B01J21/18B01J35/02B01J37/03B01J37/08B01J37/32B01J37/00C07C29/141C07C67/303C07C209/48C07C209/52C10G2/00C07C211/27C07C211/07C07C69/24C07C33/18
CPCB01J23/755B01J35/006B01J35/0013B01J37/084B01J37/0045B01J37/32B01J21/18C10G2/332C07C209/52C07C209/48C07C67/303C07C29/141B01J37/033B01J35/023C07C211/27C07C211/07C07C69/24C07C33/18B01J35/0066B01J37/0072B01J37/04B01J37/086C07C29/145C07C209/70
Inventor A·赖因斯多尔夫D·沃尔夫R·卡德罗夫S·莎姆斯基
Owner EVONIK OPERATIONS GMBH