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Method for synthesis of silica loaded nickel-platinum catalyst by ultrasonic spray pyrolysis

A technology for synthesizing silica and platinum catalysts, which is applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., and can solve the problem of expensive silica carriers and carrier molding problems. Solve problems such as complex process and loading process, and achieve the effect of realizing reuse, good dispersion and simple process

Active Publication Date: 2013-07-31
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defects of the above-mentioned prior art, the object of the present invention is to provide a method for synthesizing silica-supported nickel-platinum by ultrasonic spray pyrolysis in view of the shortcomings of the impregnation method, such as the expensive nano-silica catalytic carrier and the complicated carrier molding process. The catalyst method solves the problems of expensive silica carrier and complex loading process, and has the advantages of simple synthesis process, and the obtained nano-silica supported nickel-platinum catalyst has high activity and good dispersibility

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The method for synthesizing silica-supported nickel-platinum catalyst by ultrasonic spray pyrolysis method specifically comprises the following steps:

[0020] Step 1, preparation of soluble compound solution containing active metal: Ni(OH) 2 Dissolve in 0.4mol / L hydrochloric acid solution to form NiCl 2 Solution, ensure that the mass fraction of nickel is 1%.

[0021] Step two, NiCl 2 Atomization of the solution: use an ultrasonic nebulizer with a power of 200W and a transducer frequency of 1.7MHz, and an atomization rate of 0.4mL / min. NiCl 2 The solution is atomized into droplets with an average particle size of 5 μm and sprayed into the pyrolysis reactor.

[0022] Step 3, the vaporization of silicon tetrachloride: adopt polysilicon by-product silicon tetrachloride as raw material, silicon tetrachloride enters evaporator to vaporize after being purified by distillation equipment, silicon tetrachloride injection speed is 0.2mL / min.

[0023] Step 4, NiCl 2 Pyrolysi...

Embodiment 2

[0027] The method for synthesizing silica-supported nickel-platinum catalyst by ultrasonic spray pyrolysis method specifically comprises the following steps:

[0028] Step 1, preparation of soluble compound solution containing active metal: chloroplatinic acid (H 2 PtCl 6 ) was dissolved in pure water to ensure that the mass fraction of platinum was 1%.

[0029] Step two, H 2 PtCl 6 Atomization of the solution: using an ultrasonic atomizer with a power of 200W and a transducer frequency of 1.7MHz, the atomization rate is 0.4mL / min, and the H 2 PtCl 6 The solution is atomized into droplets with an average particle size of 5 μm and sprayed into the pyrolysis reactor.

[0030] Step 3, the vaporization of silicon tetrachloride: adopt polysilicon by-product silicon tetrachloride as raw material, silicon tetrachloride enters evaporator to vaporize after being purified by distillation equipment, silicon tetrachloride injection speed is 0.2mL / min.

[0031] Step four, H 2 PtCl ...

Embodiment 3

[0035] The method for synthesizing silica-supported nickel-platinum catalyst by ultrasonic spray pyrolysis method specifically comprises the following steps:

[0036] Step 1, preparation of soluble compound solution containing active metal: preparation of NiCl with a mass fraction of Ni of 0.5% 2 Solution and Pt mass fraction of 0.5% H 2 PtCl 6 solution.

[0037] Step 2. Atomization of the mixed solution containing Ni / Pt active components: use an ultrasonic atomizer with a power of 200W and a transducer frequency of 1.7MHz, and the atomization rate is 0.4mL / min to atomize the Ni / Pt active solution into The droplets with an average particle size of 5 μm are sprayed into the pyrolysis reactor.

[0038] Step 3, the vaporization of silicon tetrachloride: adopt polysilicon by-product silicon tetrachloride as raw material, silicon tetrachloride enters evaporator to vaporize after being purified by distillation equipment, silicon tetrachloride injection speed is 0.2mL / min.

[003...

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Abstract

The invention relates to a method for synthesis of a silica loaded nickel-platinum catalyst by ultrasonic spray pyrolysis. The method includes: step 1. preparing a nickel-platinum-containing soluble compound solution; step 2. atomizing the nickel-platinum-containing soluble compound solution; step 3. vaporizing silicon tetrachloride; step 4. bringing the atomized nickel-platinum liquid drops and silicon tetrachloride vapor to undergo a pyrolytic reaction so as to generate nanoscale silica, simultaneously making the active nickel-platinum-containing soluble compound form catalyst particles under high temperature and loading them on the nano-silica; and step 5. collecting and drying the catalyst. The method provided in the invention solves the problems that a silica carrier is expensive and the loading process is complex, has a simple synthesis process, and the obtained nano-silica loaded nickel-platinum catalyst has high activity and good dispersity.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a method for synthesizing a silica-loaded nickel-platinum catalyst by an ultrasonic spray pyrolysis method. Background technique [0002] Nano-scale silica has a huge specific surface area, suitable pore structure distribution, good mechanical strength and chemical inertness, and can be used as a catalyst carrier. Silica-supported nickel-platinum metal catalysts can be used to catalyze various reactions such as hydrogenation, dehydrogenation, and hydrocracking. [0003] The preparation of silica-supported active metal catalysts is currently mostly using the impregnation method, that is, the carrier silica is immersed in a solution containing active components to fully contact, and then filtered, dried, roasted and activated to obtain the catalyst. The catalyst prepared by the impregnation method, the loaded active components are mainly distributed on the...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J37/34
Inventor 蒋建国陈雪景
Owner TSINGHUA UNIV
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