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Preparation method of noble-metal-supported catalyst

A noble metal catalyst and noble metal technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of low catalytic activity, difficulty in ensuring product quality stability, The complexity of the nanocatalyst process and other issues, to achieve a simple, continuous and easy-to-control preparation process

Active Publication Date: 2013-10-30
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The discontinuous and multi-step preparation of nanocatalysts by the traditional liquid phase deposition method is complicated, and the product quality stability is difficult to guarantee. It cannot be guaranteed that all noble metal nanoparticles can be loaded on the metal oxides, resulting in low catalytic activity, which greatly limits nanocatalysts. Catalyst application

Method used

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  • Preparation method of noble-metal-supported catalyst
  • Preparation method of noble-metal-supported catalyst
  • Preparation method of noble-metal-supported catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Prepare 37.5mL containing Ce(NO 3 ) 3 ·6H 2 Aqueous solution of O and 202.5mL containing Pt(acac) 2 xylene oil phase. Among them, Ce(NO 3 ) 3 ·6H 2 The molar concentration of O in the aqueous phase is 1.0mol / L, Pt(acac) 2 The mass fraction of Ce(NO 3 ) 3 ·6H 2 0.2% of O mass. The water phase and the oil phase were ultrasonically mixed for 10 min, and 10 mL of surfactant Span-80 was added at the same time to form a water-in-oil emulsion. The water-in-oil emulsion was passed through a flame spray pyrolysis device ( figure 2 ) after forming spray droplets (spray droplet structure such as figure 1 ) to further prepare loaded noble metal catalyst powder. The flow rate of the emulsion is 9.225mL / min, and the flow rates of combustion-supporting oxygen, combustion-supporting methane and atomizing oxygen are 4.0L / min, 2.4L / min and 4.0L / min, respectively. Use a particle collection device to obtain a powder.

Embodiment 2

[0032] Prepare 50mL containing Ce(NO 3 ) 3 ·6H 2 O, Mn(CH 3 COO) 2 4H 2 O, Al(NO 3 ) 3 , Zn(CH 3 COO) 2 , Zr(NO 3 ) 4 , La(CH 3 COO) 3 The aqueous phase solution and 250.0mL containing Pt(acac) 2 xylene oil phase. Wherein, the total molar concentration of the metal oxide precursor in the aqueous phase is 1.0mol / L, Pt(acac) 2 The mass fraction of is 0.2% of the mass of the metal oxide precursor. The water phase and the oil phase were ultrasonically mixed for 10 min, and 10 mL of surfactant Span-80 was added at the same time to form a water-in-oil emulsion. The emulsion is passed through a flame spray pyrolysis device to prepare a loaded noble metal catalyst powder. The flow rate of the emulsion is 9.225mL / min, and the flow rates of combustion-supporting oxygen, combustion-supporting methane and atomizing oxygen are 4.0L / min, 2.4L / min and 4.0L / min, respectively. Use a particle collection device to obtain a powder.

Embodiment 3

[0034] Prepare 50mL containing Ce(NO 3 ) 3 ·6H 2 Aqueous solution of O and 250mL containing Pt(acac) 2 toluene oil phase. Among them, Ce(NO 3 ) 3 ·6H 2 The molar concentration of O in the aqueous phase is 1.0mol / L, Pt(acac) 2 The mass fraction of Ce(NO 3 ) 3 ·6H 2 0.5% of O mass. The water phase and the oil phase were ultrasonically mixed for 10 min, and 10 mL of surfactants Span-80 and Triton X-100 (volume ratio 1:1) were added at the same time to form a water-in-oil emulsion. The water-in-oil emulsion is passed through the flame spray pyrolysis device to prepare the supported noble metal catalyst powder. The flow rate of the emulsion is 9.225mL / min, and the flow rates of combustion-supporting oxygen, combustion-supporting methane and atomizing oxygen are 4.0L / min, 2.4L / min and 4.0L / min, respectively. Use a particle collection device to obtain a powder.

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Abstract

The invention relates to the field of preparation of a catalyst and particularly relates to a preparation method of a noble-metal-supported catalyst. The preparation method of the noble-metal-supported catalyst, disclosed by the invention, comprises the following steps: 1) dissolving a metal oxide precursor in water to prepare a water phase; dissolving a noble metal precursor in an oil-phase solvent to prepare an oil phase; 2) mixing the water phase and the oil phase in the step 1 with a surfactant in a volume ratio within a range from (1 to 10) to (1 to 3); carrying out ultrasonic emulsification to form a water-in-oil emulsion, wherein the surfactant accounts for 2.0-20% of the total volume or the total mass of the water-in-oil emulsion; 3) carrying out steps of atomizing, igniting, combusting, cooling and clustering on the water-in-oil emulsion to prepare noble-metal-supported catalyst powder. According to the preparation method disclosed by the invention, a preparation process is simple, continuous and easy to control and has theoretical and practical application values.

Description

technical field [0001] The invention relates to the field of catalyst preparation, in particular, the invention relates to a method for preparing a supported noble metal catalyst. Background technique [0002] Supported noble metal catalyst is a kind of widely used environment-friendly catalyst material. It has good catalytic effect on low-temperature catalytic combustion of formaldehyde and other reactions, and is widely used in ammonia synthesis reaction, organic pollutant elimination, hydrogenation and reforming catalytic reaction, gas sensor, fuel Batteries and other aspects have potential or practical application value. [0003] At present, the preparation technology of supported noble metal catalysts is mainly the liquid phase deposition method. The preparation of supported noble metal catalysts reported in the literature involves two steps: 1) preparation of metal oxides; 2) deposition of noble metals onto metal oxides. The specific steps of the liquid phase deposit...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J23/656B01J23/89
Inventor 岳仁亮陈运法刘刚刘海弟贾毅
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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