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Specific-morphology Co3O4-loaded platinum catalyst and application thereof in low-carbon alcohol synthesis reaction through CO2 hydrogenation

A catalyst and morphology technology, applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, reduction of oxygen-containing compounds, etc., can solve the problem that homogeneous catalysts are not easy to recycle and reuse, and pollute the environment and other problems, to achieve the effect of easy scale-up, high selectivity, and simple preparation method

Active Publication Date: 2017-07-25
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Meng Cui et al. adopted Ru 3 (CO) 12 –Co 4 (CO) 12 -LiI composite catalyst, the selectivity of low-carbon alcohols can reach up to 90.1% in the total alcohols, but the homogeneous catalysts have problems such as difficult recovery and reuse, and the reaction needs to add organic solvents such as imidazole to pollute the environment

Method used

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  • Specific-morphology Co3O4-loaded platinum catalyst and application thereof in low-carbon alcohol synthesis reaction through CO2 hydrogenation
  • Specific-morphology Co3O4-loaded platinum catalyst and application thereof in low-carbon alcohol synthesis reaction through CO2 hydrogenation
  • Specific-morphology Co3O4-loaded platinum catalyst and application thereof in low-carbon alcohol synthesis reaction through CO2 hydrogenation

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Experimental program
Comparison scheme
Effect test

Embodiment 1-2

[0031] Example 1-2: Preparation of nanorods or hexagonal nanodisks Co 3 o 4 Supported Pt catalyst

[0032] (1) 4.98g Co(Ac) 2 4H 2 O was dissolved in 60ml of ethylene glycol, heated to 160°C, and 0.2mol / L of Na was added dropwise 2 CO 3 solution, the consumption of 0.2mol / L Na 2 CO 3 The volume of the solution is 200ml. After the dropwise addition, the suspension is aged for 1h, filtered, and the obtained filter cake is washed three times with deionized water, and the obtained solid is dried in a vacuum oven at 50°C for 12h. ℃ in a muffle furnace for 4 h to obtain nanorods Co 3 o 4 , referred to as Co 3 o 4 -r.

[0033] (2) 2mmol Co(NO 3 ) 2 ·6H 2 O was dissolved in 40ml of water to form a red solution, 4ml of oleylamine and 20ml of ethanol were added to the red solution, and magnetically stirred for 30min to obtain a green solution. Add the green solution to a crystallization tank at 180°C for crystallization for 12 hours, centrifuge, and wash the resulting sol...

Embodiment 3-4

[0037] Using Pt / Co 3 o 4 -r catalyzed CO 2 The method for hydrogenation synthesis of low-carbon alcohols, the steps are:

[0038] The Pt / Co prepared by 0.2g embodiment 1 3 o 4 The -r catalyst was mixed with 0.2g SiC evenly and added to a self-made fixed bed reactor (made of stainless steel, 47cm long, 1 / 4 inch inner diameter), at 200°C, H 2 After 2 hours of normal pressure reduction under the atmosphere, the reactor was cooled to room temperature, and the volume fraction was 22.5% CO 2 , 67.5%H 2 , 10%N 2 The mixed gas, the reactor pressure is increased to 2MPa within 3h, and the space velocity is 6Lg cat -1 h -1 , Then the reactor temperature was raised to 190° C. (Example 3) and 200° C. (Example 4) respectively, the heating rate was 2° C. / min, and the timing of the reaction time was started after reaching this temperature. The gas phase product was analyzed online by Agilent GC7890B, and the data after the reaction was stable for 50 hours was selected to calculate ...

Embodiment 5-6

[0045] Embodiment 5-6: same as embodiment 3-4, just change catalyst to be the nano-disk Co prepared by embodiment 2 3 o 4 Supported Pt catalyst (Pt / Co 3 o 4 -p), the test results are shown in Table 3 and 4. It can be seen that at the same reduction temperature and CO 2 Compared with nanorod-supported catalysts at the hydrogenation reaction temperature, the use of hexagonal nanodisks Co 3 o 4 When supporting Pt catalyst, CO 2 The conversion rate decreased slightly, the selectivity of C2 and above hydrocarbons decreased, and the selectivity of methane and alcohols increased. with Pt / Co 3 o 4 The results of -r are similar. When the temperature is increased from 190 °C to 200 °C, the selectivity of total alcohols decreases, but the proportion of low-carbon alcohols in total alcohols increases.

[0046] Figure 4 For Pt / Co 3 o 4 -r, Pt / Co 3 o 4 The XRD pattern of the -p catalyst after hydrogen reduction at 200°C, from Figure 4 It can be seen that the morphology of t...

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Abstract

The invention relates to the technical field of catalysts, in particular to a catalyst, a preparation method thereof and application thereof in low-carbon alcohol synthesis reaction through CO2 hydrogenation. The preparation method includes: using cobalt nitrate or cobalt acetate as a cobalt source; adopting a hydrothermal crystallization or co-precipitation method to prepare Co3O4 nanoparticles different in morphology; impregnating in dinitrodiammine platinum in an equivalent volume manner, and calcining in air to prepare a Pt / Co3O4 catalyst. The catalyst can be used for low-carbon alcohol synthesis reaction through CO2 hydrogenation, and high CO2 conversion rate and low-carbon alcohol selectivity can be realized in a mild condition. Product selectivity can be adjusted effectively by regulating and changing CO2 hydrogenation reaction. The preparation method is simple, and the catalyst has high activity and stability in the mild condition and has great industrial application prospect.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a specific morphology Co 3 o 4 Supported platinum catalyst and its CO 2 Application in hydrogenation synthesis of low-carbon alcohols. Background technique [0002] CO 2 Chemistry is C 1 An important part of chemistry, CO 2 It is also the most abundant carbon resource on earth. catalytic CO 2 Hydrogenation to synthesize low-carbon alcohols can not only effectively reduce CO 2 Concentration, ease the global greenhouse effect, but also provide a practical way to solve the energy crisis. CO 2 The conversion and utilization of synthetic methanol, low-carbon alcohols, hydrocarbons, etc. Low carbon alcohol mainly refers to C 2 -C 4 Mixed alcohols, with high octane rating, can be used as clean fuels. In addition, low-carbon alcohol has good blending performance with gasoline, and can replace methyl tert-butyl ether as a gasoline additive. Compared with synthetic methanol...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J23/42C07C27/06
CPCB01J23/42B01J23/75C07C27/06
Inventor 刘冰欧阳碧熊书浩
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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