Method for preparing catalyst carrier Al2O3 powder by activating and hydrolyzing metallic aluminium under ultrasound-electric field coupling

A catalyst carrier, electric field coupling technology, applied in catalyst carrier, catalyst activation/preparation, alumina/hydroxide preparation, etc., to achieve the effects of great economic development prospects, high activity, and high product purity

Inactive Publication Date: 2010-09-15
昆明珀玺金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Chinese patent CN1079718 reports that metal aluminum is activated by mercuric chloride and then hydrolyzed with water. The existence of metal mercury is the fatal flaw of this method.

Method used

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  • Method for preparing catalyst carrier Al2O3 powder by activating and hydrolyzing metallic aluminium under ultrasound-electric field coupling
  • Method for preparing catalyst carrier Al2O3 powder by activating and hydrolyzing metallic aluminium under ultrasound-electric field coupling

Examples

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Effect test

Embodiment 1

[0046] Example 1: Use a high-purity aluminum sheet with a purity of 99.999% and a size of 5×3×0.1 as raw material, electrolytically degrease, soak in 5% NaOH aqueous solution for 10 minutes, take out pure water and rinse three times, and clean The pH value is measured as neutral. Put the aluminum sheet in a 1000ml beaker to form a primary battery with the metal platinum sheet. The size of the metal platinum sheet is: 6×6×0.08, and the pure water is 750ml (resistivity: 10MΩ.cm). The water temperature is 90°C, the stirring rate is 80 rpm, and the ultrasonic generator with an ultrasonic frequency of 20KHZ and a power of 100W is started at the same time. Discharge, react for about 6 hours without bubbles, the reaction basically stops, stop stirring and ultrasonic, cut off the connection of the original battery, and cool down. Afterwards, put the reaction product into a centrifuge for dehydration, then dry it below 200°C, and perform phase inversion treatment at 1000-1100°C to obta...

Embodiment 2

[0047] Example 2: Roll 15kg of high-purity aluminum ingot with a purity of 99.99% to a sheet with a thickness of 0.5mm, cut it into an aluminum foil electrode size: 6×4×0.5, electrolytically degrease, and then pass through a 5% NaOH aqueous solution Soak for 10 minutes, take out the pure water and rinse it three times. The pH value of the cleaning is also measured as neutral. Place it directly in a 5000ml beaker with 3000ml of pure water (resistivity: 10MΩ.cm), and the platinum-plated titanium anode The grid constitutes the primary battery, the size of the platinum-coated titanium anode grid is: 6×6×0.08, (the effective area ratio of the aluminum foil electrode and the platinum-coated titanium anode grid is 1:4), the water temperature is 90°C, the stirring rate is 80 rpm, and it starts at the same time An ultrasonic generator with an ultrasonic frequency of 40KHZ and a power of 30W puts the probe in a beaker. During the stirring and ultrasonic process, the metal aluminum powder...

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Abstract

The invention discloses a new process for preparing high purity aluminum oxide powder. The processed is carried out based on the fundamental principle of ultrasound electrochemistry, wherein electrode reactions in primary cells between metallic aluminium and air is formed under ultrasound action in a pure water system, and in-situ activation is carried out on the surface of the high purity metallic aluminium by the cavitation of an ultrasonic field, which can promote the activation of the surface of the metallic aluminium and the primary cell reaction between the metallic aluminium and the air as well as the hydrolysis reaction of the metallic aluminium. The method has simple principle, concise process, short technological procedures, low specific volume and energy consumption, environmental protection and no pollution. As under the entire ultrasound-electric field coupling condition, the reaction is moderate and controllable, and the obtained high purity Al (OH) 3 gel has small primary particle size, uniform particle size distribution, high activity, good flowability, particle appearance approximate to sphere and easy purity control. The obtained Al (OH) 3 gel is processed then by thermal treatment, and the high purity aluminum oxide powder with different forms can be obtained at different thermal treatment temperatures. The product has high purity, excellent particle characteristics and incomparable advantages over the products prepared by other production methods in the aspects of purity and particle shape.

Description

technical field [0001] The invention relates to a preparation method of high-purity alumina powder, in particular to the preparation of catalyst carrier Al by using ultrasonic-electric field coupling activation technology to promote the hydrolysis reaction of metal aluminum 2 o 3 powder. Background technique [0002] Alumina carrier is the most widely used catalyst carrier, accounting for about 70% of industrial supported catalysts. It is widely used in the field of petrochemical industry, involving reforming, hydrogenation, dehydrogenation, dehydration, dehalogenation, disproportionation, Isomerization and other reactions. The porous alumina used as a catalyst and its carrier has a large specific surface area, and its microporous surface has the properties required for catalysis. Because of its large surface area and many surface active centers, the γ-phase nano-alumina provides the necessary conditions for the catalyst, enhances the reaction speed, and improves the sele...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J35/02C01F7/42C01B3/08B01J37/34
CPCY02E60/36
Inventor 胡劲王玉天文劲松
Owner 昆明珀玺金属材料有限公司
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