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A preparation method for nano-palladium-supported catalyst with exposed highly active {110} crystal faces

A {110}, high-activity technology, applied in the field of nanocatalysts, can solve the problems of limited Pd catalytic activity, few active sites, large Pd nanoparticle size, etc., and achieves good application prospects, simple preparation method, and multiple active sites Effect

Active Publication Date: 2019-06-14
BEIJING UNIV OF TECH
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  • Abstract
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Problems solved by technology

However, the preparation method of palladium in this report is relatively complicated, and the selected reaction solvent-benzyl alcohol has the disadvantages of high toxicity and environmental pollution, and the obtained Pd nanoparticles have a size above 40nm, resulting in a small specific surface area and exposed activity. Fewer sites, low utilization rate of palladium particles, unable to achieve the effect of reducing the weight of precious metals
Later, Xu Guobao et al. (Niu, W. et al, ACS Nano 2010,4, 1987–1996) used environmentally friendly reagents as precursors, and prepared a series of Pd nanoparticles with different morphologies, from which the rhombohedral dodecahedral Pd nanocrystals surrounded by {11 0} crystal planes were discovered, which played an important role in the preparation of Pd nanocatalysts with {1 1 0} crystal planes, but the The size of Pd nanoparticles obtained by this method is still large, up to 100nm or more, which limits the manifestation of Pd catalytic activity

Method used

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  • A preparation method for nano-palladium-supported catalyst with exposed highly active {110} crystal faces
  • A preparation method for nano-palladium-supported catalyst with exposed highly active {110} crystal faces
  • A preparation method for nano-palladium-supported catalyst with exposed highly active {110} crystal faces

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Experimental program
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Effect test

Embodiment 1

[0032] Example 1: Put 0.0405g PVP in a 50ml three-neck flask, add 10ml 0.13M glucose solution, reflux and stir in an oil bath at 150°C for 10min, keep at 150°C, add 10ml 7.3mM Na 2 PdCl 4 The solution was quickly added to a three-necked flask, and continued to react for 18 hours, then washed alternately with acetone and ethanol, and then dispersed in 10ml of ethanol to obtain Pd nanoparticles with exposed highly active {11 0} crystal planes.

[0033] Depend on figure 1 It can be seen that the size of the prepared nanoparticles is less than 20nm, and the particles are uniformly dispersed. figure 2 and image 3 Compared with the standard electron diffraction pattern of {11 0} crystal system, it can be confirmed that the obtained nanoparticles are exposed to highly active {1 1 0} crystal planes. Figure 17 It can be confirmed that the obtained nanoparticles are Pd nanoparticles with exposed highly active {1 1 0} crystal faces.

Embodiment 2

[0034] Example 2: According to the preparation method of Example 1, the Pd nanoparticles exposed to the highly active {1 1 0} crystal face after centrifugal washing were dried in an oven at 80°C, and 0.1g was weighed with a microbalance and then dispersed in 5ml Deionized water, placed in a 10ml beaker, and then added 0.99g CeO 2 powder (Pd accounted for 1wt%), fully stirred at room temperature for 6h, washed alternately with acetone and ethanol, centrifuged, dried at 80°C, and calcined at 500°C for 3h in a muffle furnace to obtain Pd / CeO 2 The supported three-way catalyst is designated as sample 1.

Embodiment 3

[0038] Example 3: In this example, the reaction temperature is 180° C., and other steps are the same as in Example 1 to obtain Pd nanoparticles exposing highly active {1 1 0} crystal planes.

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Abstract

A method for preparing a nano-Pd-loaded catalyst with exposure of high-activity {110} crystal faces belongs to the technical field of nano-catalysts. The method comprises the following steps: placing a certain quantity of polyvinylpyrrolidone (PVP) in a reaction bottle; adding a glucose solution; performing return flow agitation for 10 min in an oil bath with the temperature of 30-180 DEG C; after that, adding a Na2PdCl4 solution in a reaction system; continually performing reaction for 6-30 h; then alternately washing with acetone and ethyl alcohol to obtain Pd nanoparticles with exposure of the high-activity {110} crystal faces; loading the Pd nanoparticles on CeO2. The prepared catalyst has a small nanoscale, a large specific surface area and more active sites.

Description

technical field [0001] The invention relates to a method for preparing a Pd nanoparticle-loaded catalyst exposed to highly active {1 1 0} crystal planes by using a liquid-phase chemical reduction method, and belongs to the technical field of nano-catalysts, especially automobile exhaust catalysts. Background technique [0002] At present, noble metal nanomaterials have attracted extensive attention due to their superior chemical, optical, electrical and magnetic properties. As a member of precious metals, Pd nanoparticles are widely used in industrial catalysis fields such as chemical industry, petroleum refining, and environmental protection due to their good hydrogen storage, sensing, and catalytic properties, especially as three-way catalysts for automobile exhaust. Purification treatment field. A large number of research results have confirmed that the performance and application of noble metal nanomaterials are not only related to their crystal structure, specific surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44B01D53/94G01N31/10B01D53/56B01D53/72B01D53/62
CPCB01D53/945B01J23/44G01N31/10
Inventor 何洪李伶聪张宁强黄星张桂臻刘娅李瑶瑶
Owner BEIJING UNIV OF TECH
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