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High-dispersion supported ruthenium dioxide catalyst and preparing method thereof

A ruthenium dioxide and catalyst technology is applied in the field of supported precious metal catalysts and their preparation, which can solve the problems of weak interaction between nanoparticles and supports, complex catalyst preparation methods, reduced selectivity and the like, and achieves simple preparation methods and particle size. Small, the effect of improving catalytic performance

Inactive Publication Date: 2016-09-07
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, the loaded RuO 2 The traditional preparation methods of catalysts are complicated, and the interaction between nanoparticles and supports is weak, which leads to particle migration and agglomeration during the reaction process, resulting in problems such as reduced activity, selectivity and poor stability.

Method used

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  • High-dispersion supported ruthenium dioxide catalyst and preparing method thereof
  • High-dispersion supported ruthenium dioxide catalyst and preparing method thereof
  • High-dispersion supported ruthenium dioxide catalyst and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A weighs 1g RuCl 3 ·xH 2 O was dissolved in deionized water to 100mL to prepare RuO 2 The precursor of RuCl 3 solution.

[0032] B with 15mmol Co(NO 3 ) 2 ·6H 2 O and 5mmol Al(NO 3 ) 3 9H 2 O was dissolved in 100 mL deionized water at a molar ratio of 3:1 to prepare a metal salt solution.

[0033] C Add 4.4mL of RuCl prepared in step A to the mixed solution prepared in step B 3 solution, stirred evenly to obtain a mixed solution.

[0034] D 10.4mmol Na 2 CO 3 and 32.3mmol NaOH were added to 100mL deionized water, ultrasonicated until completely dissolved, and prepared as an alkaline solution.

[0035] E. Add the mixed solution prepared in step C and the alkali solution prepared in step D dropwise into the four-neck flask at a constant speed and stir rapidly at room temperature. During the process, the pH value of the solution is always kept at 9-10. After the addition is complete, add The mixed solution was transferred to a water bath at 85°C and stirred f...

Embodiment 2

[0038] Step A is with embodiment 1;

[0039] B with 10mmol Co(NO 3 ) 2 ·6H 2 O and 5mmol Al(NO 3 ) 3 9H 2 O was dissolved in 100 mL deionized water at a molar ratio of 2:1 to prepare a metal salt solution.

[0040] C Add 2.9 mL of RuCl prepared in step A to the mixed solution prepared in step B 3 solution, stirred evenly to obtain a mixed solution.

[0041] D 10.4mmol Na 2 CO 3 and 24.2mmol NaOH were added to 100mL deionized water, and ultrasonicated until completely dissolved to prepare an alkaline solution.

[0042] E. Add the mixed solution prepared in step C and the alkali solution prepared in step D dropwise into the four-neck flask at a constant speed and stir rapidly at room temperature. During the process, the pH value of the solution is always kept at 9-10. After the addition is complete, add The mixed solution was transferred to a water bath at 85°C and stirred for 24 hours; after the stirring was completed, it was lowered to room temperature, and the obtai...

Embodiment 3

[0044] Step A is with embodiment 1;

[0045] B with 15mmol Mg(NO 3 )2 ·6H 2 O and 5mmol Al(NO 3 ) 3 9H 2 O was dissolved in 100 mL deionized water at a molar ratio of 3:1 to prepare a metal salt solution.

[0046] C Add 2.4mL of RuCl prepared in step A to the mixed solution prepared in step B 3 solution, stirred evenly to obtain a mixed solution.

[0047] D 10.4mmol Na 2 CO 3 and 32.3mmol NaOH were added to 100mL deionized water, ultrasonicated until completely dissolved, and prepared as an alkaline solution.

[0048] E. Add the mixed solution prepared in step C and the alkali solution prepared in step D dropwise into the four-neck flask at a constant speed and stir rapidly at room temperature. During the process, the pH value of the solution is always kept at 9-10. After the addition is complete, add The mixed solution was transferred to a water bath at 85°C and stirred for 24 hours; after the stirring was completed, it was lowered to room temperature, and the obtain...

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Abstract

The invention provides a high-dispersion supported ruthenium dioxide catalyst and a preparing method thereof. The preparing method comprises the steps that a precious metal polymeric precursor solution and a soluble salt solution composing the +2 and +3 valence metal ions of hydrotalcite are mixed, nucleating and growing are carried out in an alkali solution environment provided by a precipitating agent, and the RuO2 / MAl-LDH catalyst is obtained through crystallization, washing, drying and further retreatment. According to the catalyst, the precious metal Ru serves as the active ingredient and is supported on the surface of hydrotalcite MAl-LDH as a supporter, and the supported RuO2 catalyst uniform in dispersion and size is formed; the supporting amount of the active ingredient Ru is within the range of 0.5-10%, formed RuO2 nanometer particles are highly dispersed on the surface of the supporter, the particle size of the RuO2 nanometer particles ranges from 1 nm to 5 nm, and the RuO2 nanometer particles are spherical or semispherical. The transformation frequency TOF of the catalyst is remarkably higher than that of a Ru-based catalyst reported in documents in alcohol selective oxidation reactions.

Description

[0001] Field [0002] The invention relates to hydrotalcite as the carrier, the active component is RuO 2 A supported noble metal catalyst and a preparation method thereof, the catalyst can be used in various oxidation reaction processes in petrochemical, fine chemical and other fields. Background technique [0003] Selective oxidation of alcohols is an important class of functional group conversion reactions, and its products are carbonyl compounds such as aldehydes and ketones. Carbonyl compounds are widely used as chemical raw materials and intermediates in the fields of plastics, detergents, coatings, cosmetics, food additives and drugs. At present, the selective oxidation of green alcohols mainly uses molecular oxygen as the oxidant. However, since molecular oxygen has a high activation energy and a slow oxidation reaction rate, it is necessary to add a suitable catalyst to activate molecular oxygen to reduce the activation energy to promote its oxidation reaction rate....

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J23/58B01J23/656B01J35/08C07C45/38C07C47/54
CPCC07C45/38B01J23/58B01J23/6562B01J23/8913B01J35/51C07C47/54
Inventor 冯俊婷张娜李殿卿杜逸云贺宇飞
Owner BEIJING UNIV OF CHEM TECH
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