Carbon fiber compound nano copper cobalt alloy catalyst for low-carbon alcohol synthesis and preparation method of catalyst

A carbon fiber and catalyst technology, applied in the field of metal catalysts, can solve problems such as inability to achieve breakthroughs in nano-cobalt-copper alloy catalysts, and achieve the effects of not easy to sinter and grow, high low temperature activity, and high activity specific surface area.

Inactive Publication Date: 2015-04-29
TIANJIN UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] There are also many documents that have been studied and reported on nano-cobalt-copper alloy catalysts for the synthesis of low-carbon alcohols, but there are different problems, so simple combinations and preparations cannot be realized for the synthesis of nano-cobalt for low-carbon alcohols. A breakthrough in copper alloy catalysts

Method used

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  • Carbon fiber compound nano copper cobalt alloy catalyst for low-carbon alcohol synthesis and preparation method of catalyst
  • Carbon fiber compound nano copper cobalt alloy catalyst for low-carbon alcohol synthesis and preparation method of catalyst
  • Carbon fiber compound nano copper cobalt alloy catalyst for low-carbon alcohol synthesis and preparation method of catalyst

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preparation example Construction

[0044] Above-mentioned a kind of preparation method that is used for syngas to prepare the catalyst of low carbon alcohol, comprises the following steps:

[0045] 1) Add carbon fiber, 98% (w / w) sulfuric acid, 65% (w / w) nitric acid to a dry container, after ultrasonication for 2-5 hours, reflux at 100°C for 2-6 hours, suction filter and wash, at 60-100 Dry at ℃ for 12-48h to obtain acidified carbon fiber, the carbon fiber, 98% (w / w) sulfuric acid, 65% (w / w) nitric acid mass ratio is 1: (30-45): (10-15 ).

[0046] 2) according to the mol ratio of the nitrate of copper nitrate, cobalt nitrate, aluminum nitrate and additive M ion is 1: (0.4-3): (1.5-10): (0-14), the nitric acid of copper, cobalt and aluminum One or more of salt and additives such as zinc, manganese, magnesium, calcium, nickel, iron and chromium nitrates are added to deionized water to make a mixed solution with a total ion concentration of 0.01-2mol / L, which is recorded as solution A ; by NaOH and Na 2 CO 3 Th...

Embodiment 1

[0051] Add carbon fiber, 98% (w / w) sulfuric acid, 65% (w / w) nitric acid to a dry container, ultrasonicate for 2 hours, reflux at 100°C for 2 hours, filter and wash with suction, dry at 60°C for 12 hours to obtain acidification treatment The mass ratio of the above-mentioned carbon fiber, 98% (w / w) sulfuric acid, and 65% (w / w) nitric acid is 1:30:10. Weigh 25g of carbon fiber and disperse it in 15L of deionized water to obtain a carbon fiber dispersion;

[0052] The molar ratio of copper nitrate, cobalt nitrate and aluminum nitrate is 1:2:1.5 to prepare a mixed salt solution with a total metal concentration of 2mol / L, which is recorded as solution A; 2 CO 3 )=1.33mol / L and c(NaOH)=2mol / L are made into mixed alkali solution and denoted as B. Add solution A and solution B into the reactor containing the above-mentioned carbon fiber dispersion in parallel, and control the pH value to 7. After the solution A is added dropwise, let it stand for 12 hours at a temperature of 80°C. A...

Embodiment 2

[0059] Add carbon fiber, 98% (w / w) sulfuric acid, 65% (w / w) nitric acid to a dry container, ultrasonicate for 3 hours, reflux at 100°C for 3 hours, filter and wash with suction, dry at 70°C for 20 hours to obtain acidification treatment The mass ratio of the above-mentioned carbon fiber, 98% (w / w) sulfuric acid, and 65% (w / w) nitric acid is 1:35:10. Weigh 2g of carbon fiber and disperse it in 15L deionized water to obtain a carbon fiber dispersion;

[0060] The molar ratio of copper nitrate, cobalt nitrate, aluminum nitrate and zinc nitrate is 1:2:1.5:1.5 to make a mixed salt solution with a total metal concentration of 1.5mol / L, which is recorded as solution A; 2 CO 3)=2.25mol / L and c(NaOH)=3mol / L are made into mixed alkaline solution and denoted as B. Add solution A and solution B into a 1.5L reactor with a concentration of 2.7g / L carbon fiber dispersion in parallel, and control the pH value to 8. After the solution A is added dropwise, let it stand for 12 hours at a tempe...

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Abstract

The invention relates to a carbon fiber compound nano copper cobalt alloy catalyst for low-carbon alcohol synthesis and a preparation method of the catalyst. A hydrotalcite-like / carbon fiber precursor is prepared by virtue of a coprecipitation method and the precursor is reduced to obtain the nano copper cobalt alloy catalyst. Metal ions, particularly copper and cobalt ions in the catalyst precursor are uniformly mixed by controlling the precipitation condition. Due to strong interaction between metals and carbon fibers, after reduction, Cu-Co nanoalloy can be highly dispersed on the carbon fibers, so that particle sintering of the Cu-Co alloy caused by migration is effectively avoided. The prepared Cu-Co active component has a high active specific surface area. A carrier and an additive can be used for inhibiting sintering of the active component. The catalyst has the remarkable advantages that low-carbon alcohol selectivity and low-temperature activity are relatively high as well as the stability is relatively high; the CO conversion ratio at 260 DEG C can reach not less than 50%, the low-carbon alcohol selectivity can reach not less than 50%, and the active component hardly grows during sintering; the catalyst has an industrial application value.

Description

technical field [0001] The invention relates to the preparation of a nano-copper-cobalt bimetallic catalyst compounded by hydrotalcite and carbon fibers (CFs) and its application in the synthesis of low-carbon alcohols, belonging to the technical field of metal catalysts. Background technique [0002] With the increasing consumption of petroleum resources, the energy problem is intensifying, and it is imminent to develop a new energy system. Due to the wide application of low-carbon alcohols in fuel and chemical industry, synthesis gas (CO and H 2 Mixed gas), it is possible to produce low-carbon alcohols (referring to alcohols containing two or more carbon atoms) from syngas, and low-carbon alcohols have important application value in the fields of fuel and chemical industry. Low-carbon alcohols can be used as high-quality power fuels. As petroleum additives, they can replace the controversial MTBE and the more toxic tetraethyl lead. high in alcohols. In addition, low-car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J23/80B01J23/78B01J23/889B01J23/755C07C31/04C07C31/08C07C31/10C07C29/156
CPCY02P20/52
Inventor 刘源王联防曹昂刘贵龙韩通
Owner TIANJIN UNIV
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