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Catalyst preparation method and application

A catalyst and catalytic liquefaction technology, applied in the field of catalytic chemistry, can solve the problems of high price, poor catalyst structure and activity stability, and achieve high liquefaction rate, good stability and good selectivity.

Inactive Publication Date: 2014-11-05
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of noble metal catalysts is that they are expensive, while CuO-MgO catalysts have high activity, good selectivity, and are cheap and easy to obtain, but the structure and activity stability of the catalyst are poor; hydrotalcite is a kind of composite metal hydroxide with a layered structure. It has a good dispersing effect on metal cations; but it has not been used in the study of cellulose transfer hydrogenation liquefaction; the present invention provides a method using CuO-MgO-Al 2 o 3 Hydrotalcite is used as a precursor to prepare composite metal oxide catalysts and used in the catalytic liquefaction of supercritical methanol cellulose

Method used

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  • Catalyst preparation method and application
  • Catalyst preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0036] CuO-MgO-Al described in this example 2 o 3 The preparation method of catalyst specifically comprises the following steps:

[0037] (1) Three metal nitrates Cu (NO 3 ) 2 ·3H 2 O, Mg (NO 3 ) 2 ·6H 2 O and Al (NO 3 ) 3 9H 2 O is dissolved in deionized water to obtain a metal nitrate mixed solution, wherein Cu in the metal nitrate mixed solution 2+The molar concentration is 1.5mol / L, Mg 2+ The molar concentration is 1.0mol / L, Al 3+ The molar concentration is 2.5mol / L;

[0038] (2) Using the constant pH co-precipitation method, pH=10, drop the metal nitrate mixed solution obtained in step (1) and the NaOH solution with a molar concentration of 1.0mol / L into constant temperature deionized water, and stir to make it Mix evenly, wherein, deionized water is placed in a constant temperature water bath, and the temperature of the water bath is 65°C; the volume ratio of NaOH solution and metal nitrate mixed solution is 1:2, and the stirring speed is 300r / min;

[0039]...

Embodiment 2

[0047] CuO-MgO-Al described in this example 2 o 3 Catalyst preparation methods, such as figure 1 As shown, it specifically includes the following steps:

[0048] (1) Three metal nitrates Cu (NO 3 ) 2 ·3H 2 O, Mg (NO 3 ) 2 ·6H 2 O and Al (NO 3 ) 3 9H 2 O was dissolved in deionized water to obtain a metal nitrate mixed solution, and in the metal nitrate mixed solution Cu 2+ The molar concentration is 0.5mol / L, Mg 2+ The molar concentration is 1.0mol / L, Al 3+ The molar concentration is 1.5mol / L, Cu 2+ and Mg 2+ The molar concentration ratio is 0.5:1, Cu 2+ and Mg 2+ The sum of molar concentrations and Al 3+ The molar concentration ratio is 1:1;

[0049] (2) Using the constant pH co-precipitation method, pH=10, drop the metal nitrate mixed solution obtained in step (1) and the NaOH solution with a molar concentration of 1.0mol / L into constant temperature deionized water, and stir to make it Mix evenly, wherein, deionized water is placed in a constant temperature...

Embodiment 3

[0055] CuO-MgO-Al described in this example 2 o 3 The preparation method of catalyst specifically comprises the following steps:

[0056] (1) Three metal nitrates Cu (NO 3 ) 2 ·3H 2 O, Mg (NO 3 ) 2 ·6H 2 O and Al (NO 3 ) 3 9H 2 O is dissolved in deionized water to obtain a metal nitrate mixed solution, wherein Cu in the metal nitrate mixed solution 2+ The molar concentration is 2.5mol / L, Mg 2+ The molar concentration is 2.5mol / L, Al 3+ The molar concentration is 5.0mol / L;

[0057] (2) Using the constant pH co-precipitation method, pH=10, drop the metal nitrate mixed solution obtained in step (1) and the NaOH solution with a molar concentration of 0.5mol / L into constant temperature deionized water, and stir to make it Mix evenly, wherein, deionized water is placed in a constant temperature water bath, and the temperature of the water bath is 100°C; the volume ratio of NaOH solution and metal nitrate mixed solution is 1:1, and the stirring speed is 500r / min;

[005...

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Abstract

The invention discloses a catalyst preparation method and an application, which belongs to the catalytic chemistry field. The method employs three metal salts of copper nitrate hydrate, magnesium nitrate hexahydrate, aluminum nitrate nonahydrate as main part, uses sodium hydroxide as a precipitating agent, the raw materials are subjected to titration, stirring, aging, pumping filtration, washing and drying to CuO-MgO-Al2O3 hydrotalcite (a precursor) through a constant pH value coprecipitation method, the corresponding CuO-MgO-Al2O3 composite metal oxide catalyst can be obtained through high temperature roasting, and is used in supercritical methanol for catalyzing and liquefying cellulose. The composite metal oxide catalyst can be taken as the catalyst, and can perform liquefaction reaction of cellulose in supercritical methanol, and the result proves that the catalyst has high activity and good stability, and has high liquefaction rate to cellulose in a liquefaction experiment.

Description

technical field [0001] The invention provides a preparation method and application of a catalyst, belonging to the field of catalytic chemistry. Background technique [0002] Fossil energy resources tend to be exhausted, and the development of new biomass energy is a feasible way to solve energy problems. Biomass refers to the general term of various organisms synthesized by photosynthesis, which has the advantages of regeneration and zero environmental pollution. Simple, green, efficient, and energy-saving conversion of biomass energy to prepare fuels and chemicals can greatly reduce human dependence on fossil energy and reduce CO 2 Emissions have become the ideal choice that best meets the current development needs. Lignocellulosic biomass is the most abundant biomass resource in biomass resources, including cellulose, hemicellulose and lignin. The method of converting cellulose into bio-alcohol and bio-oil has become the focus of current social research. [0003] Hydr...

Claims

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Application Information

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IPC IPC(8): B01J23/72C07C29/00C07C31/02
CPCY02P20/54
Inventor 包桂蓉陈新怡李法社李秀凤孙美佳谭方关王华
Owner KUNMING UNIV OF SCI & TECH
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