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Rhodium/carbon nanotube catalyst and preparation method and application

A technology of carbon nanotubes and catalysts, applied in the field of rhodium/carbon nanotube catalysts; can solve the problems of catalyst preparation and application that have not been reported, and achieve the effects of high activity and selectivity, simple and convenient operation, and stable catalysts

Inactive Publication Date: 2014-09-24
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the preparation and application of catalysts that selectively support rhodium nanoparticles in the lumen of carbon nanotubes have not been reported.

Method used

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  • Rhodium/carbon nanotube catalyst and preparation method and application
  • Rhodium/carbon nanotube catalyst and preparation method and application
  • Rhodium/carbon nanotube catalyst and preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Weigh 4.0 grams of carbon nanotubes (average inner diameter 5-10nm, outer diameter 10-20nm) into a 250mL round-bottomed flask, put in a magnetic stirrer, add 200mL nitric acid (3.4%), stir at room temperature for 18 hours, Brookfield The funnel was suction-filtered, washed with deionized water until the pH of the filtrate was neutral, and placed in an oven at 80°C at a constant temperature for 24-48 hours to obtain an unopened carbon nanotube carrier.

Embodiment 2

[0046] Weigh 12.0 grams of carbon nanotubes (average inner diameter 5-10nm, outer diameter 10-20nm) into a 1L round-bottomed flask, put in a magnetic stirrer, add 600mL concentrated nitric acid (65-68%), put on a reflux condenser tube, heated to 140°C in an oil bath, stirred and refluxed for 3 to 18 hours as needed, cooled, filtered, washed with deionized water until the pH value of the filtrate was neutral, and placed in an oven at 80°C for 24 to 48 hours at a constant temperature. An open functionalized carbon nanotube support is obtained.

Embodiment 3

[0048] Preparation of rhodium / carbon nanotube catalysts loaded with rhodium nanoparticles inside the lumen of carbon tubes

[0049] 1) In a round bottom flask, weigh rhodium chloride (2.6mg, rhodium content ≥ 39%, 0.1% rhodium loading), add 0.2mL deionized water, shake for a few minutes to dissolve rhodium chloride, and then Add 40mL of acetone, stir evenly, then add 1.0g of dry functionalized carbon nanotube support (average inner diameter 5-10nm, outer diameter 10-20nm), electromagnetically stir to mix evenly, then place in an ultrasonic oscillator, turn on the ultrasonic Process for 4 hours.

[0050] 2) Take it out and continue to stir and impregnate at 30°C until the solvent evaporates completely, forming a solid block.

[0051] 3) Crush the block obtained in step 2, place it in a 40°C oven to dry and keep it at this temperature for 24-48 hours;

[0052] 4) Grinding the product obtained in step 3 into a fine powder to obtain a rhodium chloride / carbon nanotube catalyst in...

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Abstract

The invention relates to a rhodium / carbon nanotube catalyst of rhodium nanoparticle supported in a tube chamber of a carbon nanotube used for an olefin hydrogen formylation reaction, the catalyst takes the carbon nanotube as a carrier, the rhodium nanoparticle can be dispersed in the tube chamber, the size is uniform and the particle size is 1-3nm; the rhodium / carbon nanotube catalyst appears higher activity by comparing with other carrier supported catalyst in the hydrogen formylation reaction of styrene, the highest TOF value can reach more than 300h<-1>, when an appropriate phosphite ester ligand is added in the reaction system, activity is increased, the highest TOF value can reach more than 1000h<-1> which is the highest intrinsic reaction activity obtained in the styrene hydrogen formylation reaction of a heterogeneous catalyst; the selectivity of product aldehyde generated by catalysis of the catalyst is high and can reach more than 99%, the selectivity for producing branched chain aldehyde can reach 94%; and 42% of enantioselectivity can be obtained in the presence of the chiral ligand.

Description

technical field [0001] The invention relates to a rhodium / carbon nanotube catalyst suitable for heterogeneous hydroformylation reactions; [0002] The present invention also relates to the preparation method of above-mentioned rhodium / carbon nanotube catalyst; [0003] The present invention also relates to the application of the above-mentioned rhodium / carbon nanotube catalyst. Background technique [0004] There are many kinds of supports used in heterogeneous catalysis, such as carbon supports, silicon supports, oxide supports and organic polymer supports. These support materials have their own characteristics and are widely used in the field of heterogeneous catalysis. In recent years, with the development of material science, some new materials, such as graphene, carbon nanotubes (CNTs), metal-organic framework (MOF) and covalent bond-organic framework (COF), have been synthesized by people. out and applied in various fields. As another form of carbon, carbon nanotube...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46C07B41/06C07C45/50C07C47/228C07C47/02C07C69/14C07C67/293
Inventor 李灿卢胜梅杨志旺管再鸿蒋宗轩
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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