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A kind of ru-rh/c bimetallic catalyst and its preparation method and application

A bimetallic catalyst and catalyst technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, amino compound preparation, etc., can solve the problems of poor catalytic performance and low MDA stereoselectivity, etc. Achieve high activity and selectivity, good electronic effect and catalytic hydrogenation performance, good effect of stereoselectivity

Active Publication Date: 2022-02-25
CHENZHOU GAOXIN PLATINUM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The MDA stereoselective hydrogenation catalyst involved in the above-mentioned patents is mainly a single-component ruthenium catalyst, and its catalytic performance is generally inferior to that of a two-component ruthenium-rhodium catalyst, and side reactions such as ammonolysis and coupling are prone to occur. 12 MDA stereoselectivity is not high

Method used

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  • A kind of ru-rh/c bimetallic catalyst and its preparation method and application
  • A kind of ru-rh/c bimetallic catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Activated carbon was treated with 2w.t.% KOH for 2h, the liquid-solid ratio was 8:1, the temperature was 30°C, suction filtered, washed and dried.

[0030] 2) 1.22g RuCl 3 ·nH 2 O and 2g of polyvinylpyrrolidone (PVP) were dissolved in 200mL of deionized water, and the concentration of PVP in the system was 1w.t.%. Under vigorous stirring, use 10w.t.% NaOH solution to adjust the pH of the system to 5-6, add 40mL of 2.5w.t.% NaBH 4The solution was reduced and equilibrated for 1 hour to form a ruthenium sol.

[0031] 3) Synthesis of Ru-Rh composite nanoparticles: 0.13g RhCl 3 ·nH 2 O was dissolved in 5mL deionized water to form a rhodium precursor, and was added dropwise to the Ru sol system in step 2) under stirring, 2.37mL of 5w.t.% formaldehyde solution was added, and the pH of the system was adjusted to 8 with 10w.t.% NaOH solution. ~9, raise the temperature to 80°C, keep it warm for 2 hours, and control the pH value of the system to not be lower than 6.

[00...

Embodiment 2

[0034] Same as Example 1, the difference is that the PVP concentration of the system is 0.25w.t.%, the ruthenium content in the catalyst is 4.5%, and the rhodium content is 0.5%.

Embodiment 3

[0036] Same as Example 1, except that the activated carbon is treated with 2w.t.% LiOH, the PVP concentration of the system is 0.25w.t.%, the ruthenium content in the catalyst is 4.5%, and the rhodium content is 0.5%.

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Abstract

The invention discloses a Ru-Rh / C bimetallic catalyst, a preparation method and application thereof. The catalyst is composed of carrier activated carbon and active component Ru-Rh composite nanoparticles, the activated carbon accounts for 90-99w.t.% of the total weight of the catalyst, and the Ru-Rh composite nanoparticles accounts for 1-10w of the total catalyst weight. t.%. Catalyst preparation process: first synthesize Ru metal colloid, then reduce Rh on Ru nanoparticles, self-assemble to form Ru-Rh composite nanoparticles, and finally adsorb on alkali-treated activated carbon. The catalyst is used in the catalytic hydrogenation of MDA to prepare H 12 MDA, MDA conversion greater than 99.9%, trans, trans-H 12 The content of MDA isomers is not higher than 20%, which maintains high activity and selectivity under low pressure, and achieves low trans,trans-H 12 Stereoselectivity of MDA isomer content.

Description

technical field [0001] The invention belongs to the field of catalysts, and relates to a Ru-Rh / C bimetallic catalyst and its preparation method and application, in particular to the preparation of hydrogen by stereoselective hydrogenation of polyurethane monomer MDA using the catalyst. 12 Application in MDA. Background technique [0002] 4,4'-Diaminodicyclohexylmethane (H 12 MDA or PACM) is an important raw material for the preparation of a new generation of saturated polyurethane "dicyclohexylmethane diisocyanate (HMDI)" with superior performance. It usually uses 4,4'-diaminodiphenylmethane (MDA) as a raw material. Under the action of high-pressure hydrogenation, PACM is prepared first, and then PACM is phosgenated to obtain HMDI. PACM has three stereoisomers: trans-trans, cis-trans, and cis-cis, among which PACM products with trans-trans isomer content of about 20% or less (also known as PACM-20) are mainly used Synthesized from high quality transparent polyurethane. S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/46C07C209/72C07C211/36
CPCC07C209/72B01J23/464C07C2601/14
Inventor 欧阳文兵雷婧杨拥军雷涤尘杨静
Owner CHENZHOU GAOXIN PLATINUM
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