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Preparation method and application of carbon-supported ir-based alloy catalyst with high hydrogenation selectivity

A technology based on alloys and catalysts, which is applied in the field of preparation of highly hydrogenation-selective carbon-supported Ir-based alloy catalysts, can solve problems such as the difficulty in developing catalysts and the limited direction of expansion and improvement of single-metal Ir catalysts, and achieve excellent catalytic performance. Active and unsaturated alcohol selectivity, good application prospects, mild reaction conditions

Active Publication Date: 2022-07-12
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the direction of expansion and improvement of monometallic Ir catalysts is limited, and it is difficult to develop more excellent catalysts

Method used

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  • Preparation method and application of carbon-supported ir-based alloy catalyst with high hydrogenation selectivity
  • Preparation method and application of carbon-supported ir-based alloy catalyst with high hydrogenation selectivity
  • Preparation method and application of carbon-supported ir-based alloy catalyst with high hydrogenation selectivity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Example 1 Preparation of IrCd / CB Heterogeneous Catalyst

[0060] 15mg IrCl 3 ·xH 2 O (0.05mmol), 184mg CdCl 2 (1 mmol), 96 mg of CA, 50 mg of carbon black and 12 mL of ethylene glycol were added to a 20 mL glass bottle, vigorously stirred at room temperature at 25°C (speed of 500 rpm) for 0.5 h and sonicated for 0.5 h (360 W) to obtain a clear brownish-yellow solution. Then the glass bottle was sealed and heated in an oil bath at 160°C for 5 hours. After naturally cooling to room temperature, the product was washed once with water and absolute ethanol in turn, collected by centrifugation (rotation speed at 8000 r / min), and placed in an oven at 60°C. Dry in medium for 12 hours to prepare IrCd / CB.

[0061] TEM test and particle size measurement of IrCd / CB, such as figure 1 As shown, the metal particles were found to be uniformly distributed on the carbon black and no agglomeration was found. like figure 2 As shown, the average particle size of the IrCd / CB alloy par...

Embodiment 2

[0063] Example 2 Preparation of IrGa / CB

[0064] The preparation method is the same as that of IrCd / CB, except that 184 mg of CdCl 2 (1mmol) to 18.5mg Ga(acac) 2 (0.05 mmol) to prepare IrGa / CB.

[0065] TEM test and particle size measurement of IrGa / CB, such as Figure 4 As shown, the metal particles were found to be uniformly distributed on the carbon black and no agglomeration was found. like Figure 5 As shown, the average particle diameter of the IrGa / CB alloy particles was 1.6 nm.

[0066] TEM test and elemental distribution analysis of high-angle annular dark-field scanning of IrGa / CB, such as Image 6 The TEM image and element mapping image of , it can be seen from the figure that the distribution positions of Ir and Ga elements are basically the same, which proves the formation of an IrGa alloy.

Embodiment 3

[0067] Example 3 Preparation of IrSn / CB

[0068] The preparation method is the same as that of IrCd / CB, except that 184 mg of CdCl 2 (1mmol) replaced by 8.8mg SnC l4 ·5H 2 O (0.05 mmol), IrSn / CB was prepared.

[0069] TEM test and particle size measurement of IrSn / CB, such as Figure 7 As shown, the metal particles were found to be uniformly distributed on the carbon black and no agglomeration was found. like Figure 8 As shown, the average particle size of the IrSn / CB alloy particles was 1.3 nm.

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Abstract

The invention belongs to the technical field of selective hydrogenation, and in particular relates to a preparation method and application of a carbon-supported Ir-based alloy catalyst with high hydrogenation selectivity. The supported Ir-based alloy catalyst has a simple method, relatively mild reaction conditions, and the reaction environment is not harsh and does not require a special atmosphere; the used support carbon black has many oxygen-containing groups, which can fix metal salts and promote the reduction of metal salts. The smaller particles make the particle diameter of the obtained catalyst product smaller, the effective catalytic area is larger, the metal particles are not easily lost, and the catalytic activity of the metal is better and more stable. In terms of catalytic performance, the catalyst prepared by the present invention can catalyze hydrogenation of cinnamaldehyde at room temperature, and has excellent performance, excellent catalytic activity and unsaturated alcohol selectivity, and good cycle performance, and can be used in hydrogen storage, hydrogenation and dehydrogenation. It has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of selective hydrogenation, and in particular relates to a preparation method and application of a carbon-supported Ir-based alloy catalyst with high hydrogenation selectivity. Background technique [0002] In recent years, the selective hydrogenation of α,β-unsaturated aldehydes to obtain relatively single products has become a research hotspot, because both C=C double bond hydrogenation products and C=O double bond hydrogenation products can be used. It is used in the fields of reaction intermediates, perfumes, food processing and so on. Since C=O double bonds are more stable than C=C double bonds in thermodynamics, it is still difficult to obtain unsaturated alcohols by highly selective hydrogenation of C=O bonds. For example, the selective formation of 3-aminostyrene from 3-nitrostyrene is an important but difficult reaction to achieve high selectivity. [0003] Ir-based noble metals and their alloys a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/60B01J23/62B01J35/00B01J35/02B01J37/00C07C29/141C07C33/22
CPCB01J23/60B01J23/62B01J23/626B01J37/0018C07C29/141B01J35/399B01J35/40C07C33/32Y02P20/52
Inventor 李光琴刘庆林刘千
Owner SUN YAT SEN UNIV
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