Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Ruthenium-modified ir/c catalyst, its preparation method and its application in citral hydrogenation

A catalyst, citral technology, applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem that reactivity, selectivity and stability cannot be taken into account at the same time, Difficult separation of products, complex preparation process and other problems, to achieve the effect of reducing the cost of precious metals, mild process conditions, and high reactivity

Active Publication Date: 2018-01-30
JIANGXI HANS PRECIOUS METALS CO LTD +1
View PDF1 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation method of this technical solution has problems such as complex preparation process, relatively harsh operating conditions, and difficult separation of products, especially its reactivity, selectivity and stability cannot be taken into account at the same time.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Ruthenium-modified ir/c catalyst, its preparation method and its application in citral hydrogenation
  • Ruthenium-modified ir/c catalyst, its preparation method and its application in citral hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step (a), the treatment of activated carbon, activated carbon with 5%HNO 3 The solution was stirred at 80°C for 4h, then washed with deionized water until neutral;

[0038] Step (b), according to the active component iridium loading 5.0%, prepare iridium solution;

[0039] Step poly (c), get the activated carbon 5g of step (a), adopt equal volume impregnation method to impregnate the iridium solution prepared. Stand in a water bath at 40°C for 8 hours, and dry at 100°C for 4 hours to obtain the Ir / C catalyst precursor;

[0040] Step (d), use 5wt% sodium hydroxide aqueous solution to adjust the pH value of the precursor to 10, and leave it to age for 8 hours;

[0041] Step polymerization (f), at 100°C, put into the autoclave, under the pressure of 2MPa, reduce for 2h, cool, filter, and wash with deionized water until there is no chloride ion, then the Ir / C catalyst can be obtained.

Embodiment 2

[0043] Step (a), the treatment of activated carbon, activated carbon with 5%HNO 3 The solution was stirred at 80°C for 4h, then washed with deionized water until neutral;

[0044] Step (b), according to the active component iridium loading 4.0%, ruthenium loading 1.0%, prepare iridium solution and ruthenium solution respectively;

[0045] Step poly (c), get the activated carbon 5g of step (a), adopt equal volume impregnation method to impregnate the prepared iridium solution and ruthenium solution. Stand still in a water bath at 40°C for 8 hours, and dry at 100°C for 4 hours to obtain the Ir-Ru / C catalyst precursor;

[0046] Step (d), use 5wt% sodium hydroxide aqueous solution to adjust the pH value of the precursor to 10, and leave it to age for 8 hours;

[0047]Step (f), reduce the above solution with sodium borohydride solution, the amount is more than 100% of the theoretical amount, reduce for 2h, cool, filter, and wash with deionized water to get 4%Ir-1%Ru / C catalyst....

Embodiment 3

[0049] Step (a), the treatment of activated carbon, activated carbon with 5%HNO 3 The solution was stirred at 80°C for 4h, then washed with deionized water until neutral;

[0050] Step polymerization (b), according to active component iridium load 3.0%, ruthenium load 2.0%, prepare iridium solution, ruthenium solution;

[0051] Step poly (c), get the activated carbon 5g of step (a), adopt equal volume impregnation method to impregnate the prepared iridium solution and ruthenium solution. Stand still in a water bath at 40°C for 8 hours, and dry at 100°C for 4 hours to obtain the Ir-Ru / C catalyst precursor;

[0052] Step (d), use 5wt% sodium hydroxide aqueous solution to adjust the pH value of the precursor to 10, and leave it to age for 8 hours;

[0053] Step (f), reduce the above solution with sodium borohydride solution, the amount is more than 100% of the theoretical amount, reduce for 2h, cool, filter, and wash with deionized water to get 3%Ir-2%Ru / C catalyst.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
pore sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses the preparation of a ruthenium-modified Ir / C catalyst and its application in citral hydrogenation. The catalyst includes an activated carbon carrier and active components are Ir nanoparticles and Ru nanoparticles. The loading amount of Ir nanoparticles is 1.0-5.0%, and the loading amount of Ru nanoparticles is 0-4.0%. The invention also discloses a preparation method of the ruthenium-iridium / C catalyst. First, the activated carbon is treated with nitric acid, and then the active component iridium and the additive ruthenium are loaded to obtain a catalyst precursor, which is dried and reduced. The catalyst of the present invention can replace part of Ir with cheaper Ru, and at the same time has higher catalytic activity and selectivity, and the catalyst can be used multiple times, reducing production costs. The catalyst of the present invention is used to hydrogenate citral to synthesize nerol. The raw material conversion rate is 100%, the selectivity of nerolidol / geraniol reaches 98.0%, and the reaction process conditions are mild, which can fully meet the requirements of industrial production.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation and catalytic hydrogenation, and in particular relates to a ruthenium-modified Ir / C catalyst, its preparation method and its application in citral hydrogenation. Background technique [0002] Citral is a typical α,β-unsaturated aldehyde, which has important application value in industries such as spices and pharmaceutical intermediates. Its selective hydrogenation product unsaturated alcohols (nerol and geraniol) are two kinds of Precious spices and pharmaceutical intermediates are widely used in the formulation of high-end flavors in diet, food, and daily chemicals. [0003] The citral molecule contains isolated C=C double bonds, C=O bonds and carbonyl-conjugated C=C double bonds that can be hydrogenated. Hydrogen is only added to the C=O double bond but not to the C=C double bond. For nerol or geraniol, the bond energy of the C=C bond is less than the C=O bond in thermodynamics, wh...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/46C07C29/141C07C33/02
CPCC07C29/141B01J23/468B01J35/393C07C33/02
Inventor 卢新宁郁丰善何治鸿相亚波赵栋云李永敏程龙高艳妮谢永荣华德润李剑李阳明
Owner JIANGXI HANS PRECIOUS METALS CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com