Preparation method of Ir and Ir-Pt/C alloy nano-catalyst with high dispersion and high load capacity

A nano-catalyst, high-dispersion technology, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, chemical instruments and methods, etc., can solve the technical difficulties of Ir and Ir alloy nano-catalysts, Ir and Ir Ir-based alloy nanoparticles are large in size and difficult to reduce Ir precursor compounds, etc., to achieve good industrial application prospects, increase specific surface area, and low equipment requirements.

Inactive Publication Date: 2013-01-16
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The melting point of iridium is as high as 2454 ° C, and the Ir precursor compound is usually extremely difficult to reduce, so the preparation of Ir and Ir alloy nanocatalysts is technically very difficult
At present, carbon-supported Ir and Ir-based alloy nanocatalysts are mainly prepared by deposition, precipitation and roasting methods. This method can obtain Ir and Ir-based catalysts with higher loadings, but the size of Ir and Ir-based alloy nanoparticles is relatively large, and the dispersibility is relatively large. Poor, and the high-temperature reduction process and roasting method in the deposition precipitation method are likely to cause the oxidation of nanoparticles, thereby affecting the activity of the prepared catalyst
Supported nanocatalysts can improve the utilization rate of noble metals and reduce the cost of catalysts, and the macroscopic quantum effects, surface effects and small size effects of nanometer-sized metal particles have a great influence on the surface structure and chemical state of catalyst active component nanoparticles. have a large impact on the electrocatalytic performance of the catalyst

Method used

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  • Preparation method of Ir and Ir-Pt/C alloy nano-catalyst with high dispersion and high load capacity
  • Preparation method of Ir and Ir-Pt/C alloy nano-catalyst with high dispersion and high load capacity
  • Preparation method of Ir and Ir-Pt/C alloy nano-catalyst with high dispersion and high load capacity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation steps of Ir / C catalyst with Ir loading of 5wt% are as follows:

[0023] 1. Add 50ml double distilled water to 100mg carbon black carrier, ultrasonic for 20 minutes, add KBH 4 Form a solution with a concentration of 1 mol / L, stir and react for 8 hours, filter, wash with 50ml of secondary water, and dry in vacuum at 60°C for 2 hours to obtain modified carbon black;

[0024] 2, in the 20ml chloroiridic acid aqueous solution that Ir content is 0.01wt%, adding 1.0ml mass fraction is 1% polyvinylpyrrolidone to do protective agent, stirs 20 minutes, adds the carbon black carrier after 38mg modified treatment, Ir: carbon Mass ratio of black = 5.26:100 Ultrasound for 30 minutes; move the dispersed reaction solution into a high-pressure reactor, pass hydrogen to 4MPa, then heat up to 150°C, react for 7 hours, after cooling to room temperature, filter and wash with double distilled water to no detectable Cl - , 60 ° C vacuum drying for 1 h to obtain a highly disp...

Embodiment 2

[0026] The preparation steps of Ir / C catalyst with Ir loading of 10wt% are as follows:

[0027] 1. Add 50ml double distilled water to 100mg carbon black carrier, ultrasonic for 20 minutes, add KBH 4 Form a solution with a concentration of 1 mol / L, stir and react for 8 hours, filter, wash with 50ml of secondary water, and dry in vacuum at 60°C for 2 hours to obtain modified carbon black;

[0028] 2, in the 20ml chloroiridic acid aqueous solution that Ir content is 0.02wt%, adding 1.0ml mass fraction is 1% polyvinylpyrrolidone to do protective agent, stirs 20 minutes, adds the carbon black carrier after 36mg modified treatment, Ir: carbon Mass ratio of black = 11.1:100 Ultrasound for 30 minutes; move the dispersed reaction solution into a high-pressure reactor, pass hydrogen to 4MPa, then heat up to 150°C, and react for 7 hours. After cooling to room temperature, filter and wash with double distilled water to no detectable Cl - , Vacuum drying at 60°C for 2h to obtain a carbon...

Embodiment 3

[0030] The preparation steps of Ir / C catalyst with Ir loading of 20wt% are as follows:

[0031] 1. Add 50ml double distilled water to 100mg carbon black carrier, ultrasonic for 20 minutes, add KBH 4 Form a solution with a concentration of 1 mol / L, stir and react for 8 hours, filter, wash with 50ml of secondary water, and dry in vacuum at 60°C for 2 hours to obtain modified carbon black;

[0032] 2, in the 20ml chloroiridic acid aqueous solution that Ir content is 0.03wt%, adding 4.0ml mass fraction is that 1% polyvinylpyrrolidone is made protecting agent, stirs 20 minutes, adds the carbon black carrier after 24mg modified treatment, Ir: carbon Mass ratio of black = 25:100 Ultrasound for 30 minutes; move the dispersed reaction solution into a high-pressure reactor, pass hydrogen to 4MPa, then heat up to 150°C, react for 7 hours, after cooling to room temperature, filter and wash with double distilled water to no detectable Cl - , Vacuum drying at 60°C for 2h to obtain a carbo...

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Abstract

The invention relates to a preparation method of an Ir and Ir-Pt / C alloy nano-catalyst with high dispersion and high load capacity by using carbon black as a carrier and Ir or Ir-Pt alloy nanoparticles as an active ingredient. The preparation method of the Ir and Ir-Pt / C alloy nano-catalyst with high dispersion and high load capacity is characterized in that a high-pressure hydrogen reduction method is utilized, and the carbon black modified by KBH4 is used as the carrier to reduce an Ir or Ir-Pt precursor compound; and the Ir or Ir-Pt alloy nanoparticles are deposited on the surface of the modified carbon black to obtain the Ir / C or Ir-Pt / C catalyst with high dispersion and high load capacity. The catalyst obtained by using the method of the invention has high Ir or Ir-Pt load ratio, controllable Ir or Ir-Pt load capacity, low cost, simple process and low equipment requirement and can prepare the Ir / C or Ir-Pt / C catalyst with the mass ratio ranging from 5 percent to 4 percent. The Ir / C or Ir-Pt / C nano-catalyst can be applied to chemical process, fuel batteries, aerospace engineering, pollution and emission control, biological engineering, and the other fields .

Description

technical field [0001] The present invention relates to the preparation of a new, economical, simple and industrially-realizable high-activity carbon-supported Ir and Ir-Pt alloy nanocatalyst, specifically using modified carbon black as a carrier to prepare carbon-supported Ir and Ir-Pt alloys. A method for Pt alloy nanocatalysts. Background technique [0002] Iridium is mainly used as a catalyst for hydrogenation of unsaturated hydrocarbons, hydrazine decomposition, and automobile exhaust purification. It is also used for methanol cracking, CO oxidation, and NH 3 decomposition etc. At present, nano-Ir and Ir-Pt alloy catalysts have shown broad application prospects in chemical process, fuel cell, aerospace engineering, pollution and emission control, bioengineering and other fields, and related patent applications are showing an increasing trend. [0003] Because nano-Ir and Ir-based catalysts need to control the size of Ir and Ir alloy nanoparticles, better catalytic act...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/46B01J37/18
Inventor 杨喜昆张正富段建军徐洋洋徐明丽
Owner KUNMING UNIV OF SCI & TECH
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