Preparation method and application of a kind of carbon nanofiber-bimetallic composite catalyst
A technology of composite catalyst and nano-carbon fiber, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, chemical instrument and method, physical/chemical process catalyst, etc., which can solve the problems of easy sintering, low service life, clogging of carrier channels, etc. problems, achieve good sintering resistance, reduce production cost, and improve conversion rate
Active Publication Date: 2018-12-28
SOUTHEAST UNIV
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Problems solved by technology
[0005] Technical problem: the purpose of the invention is in order to solve existing catalyst in CH 4 / CO 2 It is easy to sinter during the reforming process, the service life is low, and the carrier pores are easily blocked during the preparation process of the impregnation method. A preparation method for nano-carbon fiber / bimetallic composite catalyst is provided, and nano-fibers containing alkaline earth metals are prepared by electrospinning Raw silk, the raw silk is mixed with nitric acid and transition metal salt for impregnation, washed to neutral, and dried
Method used
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Embodiment example 1
[0026] (1) First weigh a certain amount of magnesium sulfate and dissolve it in acetic acid solution, then weigh 3-5g of lignin and mix, heat and stir the above mixed solution, set the end point temperature to 60-80°C, and add it with a needle during the stirring process 3-5mL of 10wt% polyvinyl alcohol solution. After continuing to stir for a period of time, turn off the heating device, naturally cool down to normal temperature and transfer to the syringe;
[0027] (2) Spinning the above-mentioned spinning solution on an electrospinning machine, and combining the prepared nanofibers with Ni(NO 3 ) 2 The mixture was soaked overnight and evaporated to dryness. Then wash to neutral and tumble dry.
[0028] (3) Place the dried compound obtained above in a horizontal tube furnace, heat it up to 200-250°C at an air flow rate of 150mL / min and a heating rate of 0.3-1°C / min, and then pre-oxidize it at a constant temperature for a period of time , after cooling down to room tempera...
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The invention discloses a preparation method and application of a nano carbon fiber-bimetallic composite catalyst, which specifically involves mixing alkaline earth metal salts into the spinning solution for spinning, and then mixing the raw fibers with nitric acid and impregnating them with transition metal salts. The obtained bimetallic composite fibrils are pre-oxidized and carbonized to obtain the nanocarbon fiber / bimetallic composite catalyst. The invention utilizes the interaction between alkaline earth metals and transition metals embedded on the fibers at high temperatures during the spinning process to fix the active components, ensuring the high dispersion of the active components on the carrier surface and the high-temperature sintering resistance. At the same time, the alkaline earth metals are used in CH4 / The characteristics of adsorption and activation of CO2 during the CO2 reforming process ensure a conversion rate of about 95% at 800°C.
Description
technical field [0001] The invention belongs to the field of composite catalyst preparation and gasification reforming, and relates to a preparation method of nano-carbon fiber / bimetal composite catalyst and its application in CH 4 / CO 2 application during reformatting. Background technique [0002] With the depletion of oil resources, high oil prices and worsening environmental pollution, the development and utilization of clean and cheap fuel resources has become an urgent issue. Currently the cleanest fuel is natural gas, which has little pollution (about 1 / 800 of coal and 1 / 40 of petroleum), and is also an ideal chemical raw material, while methane is the main component of natural gas (90%). Its chemical properties are stable, and it has the advantages of being environmentally friendly, cheap, and abundant in resources. Its reasonable use has been widely concerned by scientific researchers in various countries. At the same time, the global extreme climate problem bro...
Claims
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IPC IPC(8): B01J23/78B01J23/34B01J23/08B01J35/06C01B3/40
CPCC01B3/40B01J23/08B01J23/34B01J23/78C01B2203/0238B01J35/58Y02P20/52
Inventor 宋敏卫月星于磊毛瑞鑫刘洋徐玉叶
Owner SOUTHEAST UNIV