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Preparation method and application of oil-soluble monodisperse metal oxide nano-catalyst
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A nano-catalyst, monodisperse technology, applied in the field of preparation, monodisperse metal oxide nano-catalyst preparation, oil-soluble mono-disperse metal oxide nano-catalyst, can solve the problem of weak crystallinity, excessive ceria particle size, dispersion Sexual issues, etc.
Active Publication Date: 2020-07-21
BEIJING UNIV OF CHEM TECH
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Problems solved by technology
[0005] The ceria nanoparticles disclosed in the prior art, such as CN102557105 B, have the defects that the particle size of the ceria particles is too large, between 160 and 300nm; and the final product is a powder, which cannot be uniformly dispersed in the catalyst In the oil used in the process
The defect of the zinc oxide liquid phase dispersion disclosed in the prior art (such as CN108793226 A) is: the zinc oxide particles prepared by this method have weak crystallinity due to no hydrothermal, solvothermal or calcination treatment
The zinc oxide liquid dispersion disclosed in the prior art, such as CN1105621475 B, has the disadvantages of the method: the zinc oxide particles prepared by the method are not oil-soluble, and the liquid phase medium in which the particles are easy to disperse is water, methanol, ethanol, Highly polar solvents such as ethylene glycol and isopropanol have poor dispersibility in low-polarity solvents such as toluene, tetrahydrofuran, n-heptane, and cyclohexane, and cannot be uniformly dispersed in catalytic cracking, steam cracking, and catalytic cracking. In oil products used in other processes
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[0081] The preparation method of the above-mentioned oil-soluble monodisperse metal oxide nano-catalyst of the present invention comprises the following steps:
[0083] 2) taking a mixture of an organic solvent and water as a solvent, adding a hydrolysis accelerator to it to prepare a hydrolysis accelerator solution;
[0084] 3) mixing the metal salt solution and the hydrolysis accelerator solution to obtain a reaction solution;
[0085] 4) Aging the above reaction solution, washing and then dispersing it in a solvent to obtain a precursor dispersion;
[0086] 5) Take the surfactant, mix the precursor dispersion and the surfactant solution, and perform a solvothermal reaction to obtain nano metal oxide particles;
[0087] 6) After solvent heating, the nanometer metal oxide particles are washed, dried, and then dispersed in an ...
Embodiment 1
[0120] A method for preparing an oil-soluble monodisperse metal oxide nano-catalyst, comprising the following steps:
[0121] 1) 4.3412g ceriumnitrate hexahydrate was dissolved in 50ml deionized water to obtain ceriumnitrate solution;
[0123] 3) The sodiumhydroxide solution was added dropwise to the ceriumnitrate solution, the reaction temperature was controlled to be 50°C, the stirring rate was 500r / min, and the reaction time was 3h;
[0124] 4) Centrifuge the reaction solution at 3000r / min for 5min, wash it twice with deionized water, twice with ethanol, and twice with toluene, and ultrasonically disperse the washed precursor precipitate in 50ml of toluene to prepare the precursor Dispersions;
[0125] 5) Dissolve 0.8g of behenic acid in the precursor dispersion, transfer it into a hydrothermal kettle, and perform solvent heat treatment at 220°C for 36h;
...
Embodiment 2
[0129] Repeat Example 1, its difference is only, in step 2), sodium hydroxide is replaced with potassium hydroxide of the same quality, and its effect is similar to Example 1.
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Abstract
The invention discloses a preparation method and application of an oil-soluble monodisperse metaloxide nano-catalyst. The preparation method comprises the following steps: taking a solvent, and adding metalalkoxide or metal inorganic salt into the solvent to prepare a metal salt solution; taking a solvent, and adding a hydrolysispromoter into the solvent to prepare a hydrolysispromoter solution; mixing the metal salt solution with the hydrolysispromoter solution to obtain a reaction solution; aging the reaction solution, washing, and dispersing into a solvent to obtain a precursor dispersion; taking a surfactant, mixing the precursor dispersion and a surfactant solution, and carrying out solvothermal treatment on the mixture to obtain nano metal oxide particles; and after solvothermaltreatment, washing and drying the nano metal oxide particles, and then dispersing the nano metal oxide particles into an organic solvent to obtain the product. The one-dimensional size of the nano metal oxide particles is 2-35 nm, and the nano metal oxide particles have monodispersity. The product has a dispersion solid content of 1-60wt%, and does not settle after standing for more than or equalto 6 months.
Description
technical field [0001] The present invention relates to the technical field of nanocatalysts; more specifically, it relates to a preparation method and application of a monodisperse metal oxide nanocatalyst, especially an oil-soluble monodisperse metal oxide nanocatalyst, a preparation method and application. Background technique [0002] As we all know, the core of catalytic reaction engineering is the catalyst, and catalytic reactions can usually be divided into homogeneous catalysis and heterogeneous catalysis. The former catalyst and the reactant are in the same phase, such as gaseous or liquid, without the existence of a phase interface to carry out chemical reactions; the latter are not in the same phase, and the reaction is carried out at the two-phase interface. Many important catalytic reactions in industry are mostly heterogeneous catalytic reactions, and the catalysts are solid substances, and the reactants are mostly gaseous or liquid. The catalyst capable of ho...
Claims
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