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One-step preparation method and application of supported platinum-based multi-metal catalysts

A multi-metal catalyst, supported technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, chemical instrument and method, physical/chemical process catalyst, etc., can solve the problem of uniform dispersion of metal particles and preparation process Complicated and complicated issues, to achieve the effect of being suitable for large-scale production, environment-friendly, and time-consuming

Active Publication Date: 2014-12-03
ZHANGJIAGANG IND TECH RES INST CO LTD DALIAN INST OF CHEM PHYSICS CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In summary, although the above methods can obtain supported Pt-based multimetal catalysts, which can effectively reduce the amount of noble metal platinum and improve the utilization rate of the catalyst, the surface of the carbon support needs to be functionalized or reduced step by step in advance, and the preparation process is cumbersome. Complex, and the above method is difficult to achieve uniform dispersion of metal particles on the surface of the support when preparing catalysts with high metal loading (>10wt%)

Method used

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  • One-step preparation method and application of supported platinum-based multi-metal catalysts
  • One-step preparation method and application of supported platinum-based multi-metal catalysts
  • One-step preparation method and application of supported platinum-based multi-metal catalysts

Examples

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Effect test

Embodiment 1

[0047] Example 1: Pt 3 PD 1 / XC-72R(40wt%)

[0048] Ultrasonic disperse Vulcan XC-72R carbon powder (60mg) in 60mL aqueous solution, add 10mL ascorbic acid aqueous solution (150mM) and 10mL polyoxyethylene lauryl ether aqueous solution (1mM) under stirring; after stirring at room temperature for 10min, add to the above reaction system Add 11.6mL K 2 PdCl 4 and K 2 PtCl 4 The mixed aqueous solution, where K 2 PdCl 4 and K 2 PtCl 4 The concentrations in this mixed solution were 5 mM and 15 mM, respectively. After reacting for 1 hour, use 2L of deionized water to filter and wash for many times, and then dry in a vacuum oven at 60°C for 10 hours to obtain Pt 3 PD 1 / XC-72R (40wt%) catalyst. figure 1 for the obtained Pt 3 PD 1 / XC-72R (40wt%) catalyst transmission electron microscope (TEM). Depend on figure 1 It can be seen that the Pt-Pd bimetallic nanocatalyst grows on the surface of the support without obvious particle aggregation and scattering. The obtained ca...

Embodiment 2

[0049] Example 2: Pt 1 PD 1 / XC-72R(40wt%)

[0050] Ultrasonic disperse Vulcan XC-72R carbon powder (60mg) in 60mL aqueous solution, add 10mL ascorbic acid aqueous solution (150mM) and 10mL polyoxyethylene lauryl ether aqueous solution (1mM) under stirring; after stirring at room temperature for 10min, add to the above reaction system Add 13.2mL of K 2 PdCl 4 and K 2 PtCl 4 The mixed aqueous solution, where K 2 PdCl 4 and K 2 PtCl 4 The concentrations in this mixed solution were 10 mM and 10 mM, respectively. After reacting for 1 hour, use 2L of deionized water to filter and wash for many times, and then dry in a vacuum oven at 60°C for 10 hours to obtain Pt 1 PD 1 / XC-72R (40wt%) catalyst. Figure 4 for the obtained Pt 1 PD 1 / XC-72R (40wt%) catalyst transmission electron microscope (TEM). Depend on Figure 4 It can be seen that the Pt-Pd bimetallic nanocatalysts grow in situ on the surface of the support without obvious particle aggregation and scattering.

Embodiment 3

[0051] Example 3: Pt 9 PD 1 / XC-72R(40wt%)

[0052] Ultrasonic disperse Vulcan XC-72R carbon powder (60mg) in 60mL aqueous solution, add 10mL ascorbic acid aqueous solution (150mM) and 10mL polyoxyethylene lauryl ether aqueous solution (1mM) under stirring; after stirring at room temperature for 10min, add to the above reaction system Add 10.64mL of K 2 PdCl 4 and K 2 PtCl 4 The mixed aqueous solution, where K 2 PdCl 4 and K 2 PtCl 4 The concentrations in this mixed solution were 2 mM and 18 mM, respectively. After reacting for 1 hour, use 2L of deionized water to filter and wash for many times, and then dry in a vacuum oven at 60°C for 10 hours to obtain Pt 9 PD 1 / XC-72R (40wt%) catalyst. Figure 5 for the obtained Pt 9 PD 1 / XC-72R (40wt%) catalyst transmission electron microscope (TEM). Depend on Figure 5 It can be seen that the Pt-Pd bimetallic nanocatalysts grow in situ on the surface of the support without obvious particle aggregation and scattering.

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Abstract

A one-step preparation method and an application of supported platinum-based multi-metal catalysts are provided. The one-step preparation method comprises the specific steps: evenly mixing a carrier with an aqueous solution of a reducing agent, a surfactant, a platinum metal precursor and a non-platinum metal precursor, carrying out a reaction for 0.5-5 hours, and washing for multiple times at a low temperature (less than or equal to 100 DEG C) to enable the surfactant and other by-products in the product to be effectively removed. The platinum-based multi-metal catalysts having different metal loads (10-95 wt%) and different compositions and supported by different carriers are obtained, and the prepared supported platinum-based multi-metal catalysts are nanoparticles evenly dispersed on the surface of the carrier. The supported platinum-based multi-metal catalysts can be prepared through the one-step reaction, the reaction conditions are mild, operations are simple, the reaction is rapid, and synthesis is easy to enlarge. The prepared supported platinum-based multi-metal catalysts can be applied in the fields of petrochemical industry, chemical pharmacy, automobile tail gas purification and fuel cells.

Description

technical field [0001] The invention belongs to the fields of petrochemical industry, chemical pharmacy, automobile tail gas purification and fuel cells, and specifically relates to a one-step preparation method and application of a supported platinum-based multimetal catalyst. Background technique [0002] Platinum-based catalysts play an irreplaceable role in the fields of petrochemicals, chemical pharmaceuticals, automobile exhaust purification, and fuel cells. However, platinum reserves are limited and expensive, which limits its large-scale application. Loading platinum-based catalysts on various support materials can effectively reduce the amount of platinum and improve the utilization efficiency of platinum. For example, in the field of fuel cells, the non-supported platinum black electrocatalyst was first used, and the amount of platinum in the electrode was as high as 10mg / cm 2 ; In order to improve the utilization efficiency of platinum and reduce the cost of fuel...

Claims

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Application Information

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IPC IPC(8): B01J23/44B01J23/52
Inventor 宋玉江李焕巧
Owner ZHANGJIAGANG IND TECH RES INST CO LTD DALIAN INST OF CHEM PHYSICS CHINESE ACADEMY OF SCI
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