Method for preparing TiO2 molded catalyst carrier from titanium-based adhesive

The technology of catalyst carrier and binder is applied in the field of preparation of catalyst shaped carrier, which can solve the problems of easy powder dropping, large specific surface area, low purity, etc., and achieve the effects of solving the pollution problem, improving the powder dropping problem and improving the strength.

Active Publication Date: 2019-06-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For TiO in the prior art 2 Due to the low purity of the forming carrier, the powder is easy to fall off, and the strength and specific surface area are not compatible. 2 Preparation method of shaped carrier

Method used

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  • Method for preparing TiO2 molded catalyst carrier from titanium-based adhesive

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Add 60g of titanyl sulfate into 600ml of water, and dissolve it at 80°C to obtain a clear and transparent solution. Add 340g of metatitanic acid to the solution, stir vigorously for 40 minutes, then transfer the mixture to a tetrafluoroethylene-lined hydrothermal reactor, and react at 120°C for 4 hours under autogenous pressure. Quench with water, cool down to room temperature with NH 3 ·H 2 Adjust the PH value of the mixed solution to about 7 and form a gel. The colloid is subjected to solid-liquid separation by suction filtration to obtain a colloidal filter cake, and the colloidal filter cake is washed repeatedly with deionized water until no sulfate ion is detected in the washing liquid. Place the washed colloidal filter cake in a microwave oven for heating and dehydration, adjust the microwave power to 800W, and heat for a total of 40 minutes, divided into 8 times, 5 minutes each time, with an interval of 3 minutes between adjacent two times, to obtain solid cont...

Embodiment 2

[0037] Add 70g of titanium tetrachloride to 400ml of water at room temperature, then add 360g of nano-TiO 2 , after vigorous stirring, the mixture was transferred to a tetrafluoroethylene-lined hydrothermal reactor and reacted at 150°C for 4 hours under autogenous pressure. Quench with water, cool down to room temperature with NH 3 ·H 2 Adjust the PH value of the mixed solution to about 5 and form a gel. The solid-liquid separation of the colloid is carried out by suction filtration to obtain a colloidal filter cake, and the colloidal filter cake is repeatedly washed with deionized water until chloride ions are detected in the washing liquid. Place the washed colloidal filter cake in a microwave oven for heating and dehydration, adjust the microwave power to 800W, and heat for a total of 40 minutes, divided into 8 times, 5 minutes each time, with an interval of 3 minutes between adjacent two times, to obtain solid content A cement-like dough with a rate of 70%. The clay-li...

Embodiment 3

[0039] Add 30g of titanyl sulfate into 300ml of water, and dissolve it at 80°C to obtain a clear and transparent solution. Add 370g nano TiO to the solution 2 After stirring vigorously for 40 minutes, the mixture was transferred to a tetrafluoroethylene-lined hydrothermal reactor and reacted at 180°C for 4 hours under autogenous pressure. Quench with water, cool down to room temperature with NH 3 ·H 2 Adjust the PH value of the mixed solution to about 3 and form a gel. The colloid is subjected to solid-liquid separation by suction filtration to obtain a colloidal filter cake, and the colloidal filter cake is washed repeatedly with deionized water until no sulfate ion is detected in the washing liquid. Place the washed colloidal filter cake in a microwave oven for heating and dehydration, adjust the microwave power to 800W, and heat for a total of 40 minutes, divided into 8 times, 5 minutes each time, with an interval of 3 minutes between adjacent two times, to obtain solid ...

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Abstract

The invention provides a method for preparing a high-purity TiO2 molded catalyst carrier from a titanium-based adhesive. The method comprises: (1) carrying out hydrothermal treatment on the mixture ofa Ti-based adhesive solution and titanium-based molding powder; (2) adding a gelling agent to convert into a viscous milk-like material, washing, and filtering to obtain a slurry-like filter cake; (3) adjusting the water content of the filter cake through microwave heating to obtain a cement-like material mass; and (4) kneading the cement-like material mass, extruding, and calcining to obtain theTiO2 molded catalyst carrier. According to the present invention, the bonding action of the titanium-based adhesive is increased through the hydrothermal treatment, and the uniform distribution of the adhesive is promoted through the microwave dehydration, such that the prepared TiO2 molded carrier has characteristics of high purity, large specific surface area, high strength, good wear resistance, no powder shedding and the like, and can be used in harsh reaction systems such as strong acids, strong alkalis, strong hydrothermal systems and the like; and the TiO2 content in the molded carrieris more than or equal to 99 wt%, the crystal form is anatase or/and rutile type, the axial compressive strength is more than or equal to 8 MPa, the specific surface area is more than or equal to 70 m<2>/g, and the average pore size is 10-60 nm.

Description

technical field [0001] The invention relates to a preparation method and process for a catalyst shaped carrier, in particular to a method for preparing a TiO2 shaped catalyst carrier from a titanium-based binder. Background technique [0002] About 85% of the chemicals provided by modern chemical processes are produced by catalytic processes. Catalysts are the core of catalytic technology and play a pivotal role in the development of catalytic technology. Catalysts are generally composed of active components and carriers, and the active components are highly dispersed in the carrier. The carrier is the skeleton of the active component of the catalyst. The stability of its physical and chemical properties such as shape, strength, specific surface area, and pore structure in the catalytic reaction system determines the service life and economic value of the catalyst. With the development of modern catalytic technology and the continuous expansion of the scope of application, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J32/00B01J37/08B01J37/10B01J37/34
Inventor 吴合进赵许群王晓东张涛王晖
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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