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Preparation method of aluminum hydroxide powder containing lanthanum element

An aluminum hydroxide and element technology, which is applied in the field of preparation of lanthanum-containing aluminum hydroxide powder, can solve the problems of limiting catalyst reactivity and long-term stable operation, and achieves the effects of easy operation, large pore volume and simple process

Active Publication Date: 2011-11-23
上海竣铭化工工程设计有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the alumina supports containing noble metal catalysts are required to be calcined at a temperature above 800°C to meet the catalyst’s requirements for the acid strength and phase of the support’s surface, while the alumina support’s small pore volume and specific surface area are relatively Greatly limits the reactivity and long-term stable operation of the catalyst

Method used

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  • Preparation method of aluminum hydroxide powder containing lanthanum element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 10gAl to the reactor 2 o 3 / l of sodium metaaluminate solution, the temperature of the solution is controlled at 40°C. Under stirring, carbon dioxide gas with a concentration of 10% (v) was introduced. When the pH value of the reaction solution reached 9 (about 50 minutes after the start of the reaction), adding a concentration of lanthanum acetate aqueous solution was 0.1 La g / l. Continue feeding carbon dioxide gas to react, when the pH value of the reaction solution reaches 8, stop the reaction. This precipitate that is generated is based on the composition of the product: Al 2 o 3 99.8wt%, La 2 o 3 0.2 wt%. The resulting precipitate was filtered and washed with deionized water at 50° C. for 1.5 hours, and the sodium oxide content in the product was less than 0.09 wt%. Dry with a dynamic dryer at a temperature of 50°C for 1.5 hours. The dried product is pulverized to 300 orders with a jet mill, and both obtain the product of the present invention.

Embodiment 2

[0024] Add 45g Al to the reactor 2 o 3 / l of sodium metaaluminate solution, the temperature of the solution is controlled at 5°C. Under stirring, carbon dioxide gas with a concentration of 40% (v) was introduced. When about 30 minutes after the start of the reaction, an aqueous solution of lanthanum nitrate having a concentration of 8 La g / l was added. Continue feeding carbon dioxide gas to react, when the pH value of the reaction solution reaches 12, stop the reaction. This precipitate that is generated is based on the composition of the product: Al 2 o 3 94wt%, La 2 o 3 6.0 wt%. The resulting precipitate was filtered and washed with deionized water at 80° C. for 2.5 hours, and the sodium oxide content in the product was less than 0.08 wt%. Dry with a dynamic dryer at a temperature of 150°C for 0.5 hours. The product after drying is pulverized to 80 orders with jet mill, both obtains the product described in the present invention

Embodiment 3

[0026] Add 35gAl to the reactor 2 o 3 / l of sodium metaaluminate solution, the temperature of the solution is controlled at 10°C. Under stirring, carbon dioxide gas with a concentration of 30% (v) was introduced. When about 20 minutes after the start of the reaction, an aqueous solution of lanthanum acetate having a concentration of 6 La g / l was added. Continue feeding carbon dioxide gas to react, when the pH value of the reaction solution reaches 10, stop the reaction. This precipitate that is generated is based on the composition of the product: Al 2 o 3 96wt%, La 2 o 3 4wt%. The resulting precipitate was filtered and washed with deionized water at 70° C. for 1.0 hour, and the sodium oxide content in the product was less than 0.07 wt%. Dry with a dynamic dryer at a temperature of 130°C for 0.6 hours. The product after drying is pulverized to 100 orders with jet mill, both obtains the product described in the present invention

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Abstract

The invention relates to a preparation method of aluminum hydroxide powder containing a lanthanum element. The preparation method is characterized by comprising the following steps of: preparing a sodium metaaluminate solution; preparing an aqueous compound solution containing the lanthanum element; adding carbon dioxide under a stirring condition to a mixed solution including the sodium metaaluminate solution and the aqueous compound solution containing the lanthanum element to react and generate a precipitate which contains 94-99.8 percent by weight of Al2O3 and 0.2-6.0 percent by weight ofLa2O3; and filtering a solid-liquid mixture and washing, drying and crushing the filtered solid to prepare the aluminum hydroxide powder containing the lanthanum element. The preparation process of the invention has the advantages of simple process and easy operation without environmental pollution; lanthanum-aluminum elements in the prepared aluminum hydroxide powder containing the lanthanum element are extremely evenly combined so that a prepared alumina catalyst carrier containing the lanthanum element has greatly improved heat resistance and larger pore volume and specific surface area compared with an alumina catalyst carrier without the lanthanum element.

Description

technical field [0001] The invention relates to a method for preparing aluminum hydroxide powder containing lanthanum element, which belongs to the field of chemical catalysts. Background technique [0002] In the field of petrochemical catalyst manufacturing, especially for catalysts containing precious metal elements such as platinum and palladium, it is very common to use high-purity aluminum hydroxide powder produced by the reaction of sodium metaaluminate solution and carbon dioxide as the basic raw material for its catalyst carrier. Due to the inherent characteristics of high-purity aluminum hydroxide powder, the thermal stability of the alumina catalyst carrier made of it is relatively poor. Under normal pressure and heating, as the calcination temperature increases, its pore volume and specific surface area will increase. As the temperature increases, it tends to decrease. When the calcination temperature exceeds 800°C, the decrease rate of the pore volume and specif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J23/10B01J35/10
Inventor 万学兵
Owner 上海竣铭化工工程设计有限公司
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