Preparation of a magnetic carbon nanotube-supported rhodium catalyst and its application in selective hydrogenation of nitrile rubber

A magnetic carbon nanotube, catalyst catalyzed nitrile technology, applied in physical/chemical process catalysts, chemical/physical processes, chemical instruments and methods, etc., can solve the problem of HNBR production cost increase, hydrogenation selectivity is not as good as rhodium, HNBR performance Reduce and other problems, to achieve the effect of good recovery and recycling performance, good selectivity, and simple preparation process

Active Publication Date: 2019-09-27
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the abundance of rhodium in the earth's crust is very low, so rhodium metal is expensive, resulting in higher production costs of HNBR
Compared with rhodium-based metal catalysts, ruthenium-based metal catalysts have advantages in terms of price, but are not as selective as rhodium in hydrogenation, resulting in a relative decrease in the performance of HNBR

Method used

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  • Preparation of a magnetic carbon nanotube-supported rhodium catalyst and its application in selective hydrogenation of nitrile rubber
  • Preparation of a magnetic carbon nanotube-supported rhodium catalyst and its application in selective hydrogenation of nitrile rubber
  • Preparation of a magnetic carbon nanotube-supported rhodium catalyst and its application in selective hydrogenation of nitrile rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of magnetic carbon nanotube supported rhodium catalyst in the present embodiment is as follows:

[0028] Step 1: Preparation of magnetic carbon nanotubes

[0029] Take 0.3g of carbon nanotubes in 75ml of ethylene glycol and sonicate for 5 hours, then add 2.0g of ferric chloride and 4.2g of sodium acetate to the above solution, stir magnetically for 2 hours, homogenize, place in a hydrothermal reaction kettle, and put in water at 200°C After thermal reaction for 8 hours, after the completion of the reaction, magnetic separation removes unmagnetized carbon nanotubes to obtain magnetic carbon nanotubes (C-Fe 3 o 4 ).

[0030] Step 2: Preparation of magnetic carbon nanotube-supported rhodium catalyst

[0031] Take 0.4g of C-Fe prepared in step 1 3 o 4 Ultrasonic disperse in ethanol solvent for 3 hours, then add 100mg rhodium trichloride, react at 120°C for 30 minutes, cool to room temperature after the reaction, and magnetically separate to obtai...

Embodiment 2

[0035] The reaction time of hydrogenating NBR was set to 2h, 4h, 6h, 8h, 10h, 12h respectively, and other preparation parameters remained unchanged, in order to study the influence of different catalytic hydrogenation time on the hydrogenation degree of NBR. The experimental results are shown in Table 1.

[0036] Table 1 Effect of different catalytic hydrogenation time on NBR hydrogenation degree

[0037] Time(h) 2 4 6 8 10 12 HD(%) 69.32 80.63 94.26 98.17 98.25 98.54

[0038] It can be seen from Table 1 that with the increase of time, the hydrogenation degree of NBR is constantly increasing, but a good effect has been achieved at about 8h.

Embodiment 3

[0040] The reaction pressure of hydrogenated NBR in Example 1 was changed to 1MPa, 2MPa, 3MPa, 4MPa, 5MPa, and other preparation parameters were kept unchanged to study the influence of different reaction pressures on the hydrogenation degree of NBR. The experimental results are shown in Table 2.

[0041] Table 2 The influence of different reaction pressures on the hydrogenation degree of NBR

[0042] Pressure (MPa) 1 2 3 4 5 HD(%) 68.85 83.38 87.56 98.17 98.25

[0043] It can be seen from Table 2 that with the increase of hydrogenation pressure, the hydrogenation degree of NBR is constantly increasing, but it has achieved good results at around 4MPa.

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Abstract

The invention discloses preparation of a magnetic carbon nanotube supported rhodium catalyst and application of the magnetic carbon nanotube supported rhodium catalyst in selective hydrogenation of NBR (nitrile butadiene rubber), wherein the preparation of the magnetic carbon nanotube supported rhodium catalyst comprises the following steps: putting perchloride iron, sodium acetate, carbon nanotubes and glycol in a reactor, carrying out a hydrothermal reaction after homogenizing, and then performing magnetic separation to remove unmagnetized carbon nanotubes after the reaction is accomplished, so as to obtain magnetic carbon nanotubes; dissolving rhodium trichloride in ethanol, adding the magnetic carbon nanotubes to react, then carrying out magnetic separation to obtain the magnetic carbon nanotube supported rhodium catalyst. A magnetic carbon nanotube carrier prepared by the application of the invention is used for supporting metal rhodium, and further used for study on hydrogenation of NBR. Experimental results show that the prepared supported catalyst has very high catalytic activity and good selectivity of double bonds, and the catalyst is magnetically recycled and simply processed after being hydrogenated, and is still very high in rehydrogenation efficiency.

Description

technical field [0001] The invention relates to the preparation of a rhodium catalyst supported by magnetic carbon nanotubes and its application in selective hydrogenation of nitrile rubber. Background technique [0002] Hydrogenated nitrile rubber (HNBR) is a highly saturated elastomer obtained by hydrogenating nitrile rubber (NBR). Compared with NBR, the performance is greatly improved, and it is one of the rubbers with excellent comprehensive performance. Now it is mainly prepared by homogeneous solution hydrogenation method and heterogeneous solution hydrogenation method. The catalysts of the homogeneous solution hydrogenation method are mainly some noble metal complexes, which have high activity and good selectivity, but they are not easy to recycle and reuse, which greatly increases the production cost. Therefore, the research on catalysts for heterogeneous solution hydrogenation has become a hot spot. [0003] The catalyst of the heterogeneous solution hydrogenatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/13C08C19/02
CPCC08C19/02B01J27/13B01J35/33Y02P20/584
Inventor 钱家盛姚含波苗继斌杨斌夏茹陈鹏曹明苏丽芬郑争志
Owner ANHUI UNIVERSITY
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