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A kind of zinc-aluminum layered material and its preparation method

A zinc-aluminum layer, zinc-aluminum technology, applied in chemical instruments and methods, physical/chemical process catalysts, refining to remove heteroatoms, etc., can solve the problems of long reaction time, complex structure of layered composite hydroxide, etc. Large specific surface area, reducing the effect of the hydrothermal treatment process

Active Publication Date: 2019-10-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the co-precipitation method, although the invention uses two precipitations, the specific surface area of ​​the prepared LDH material is higher, but the reaction time of the invention is longer, and the reaction time given in the examples is more than 10 hours
The purpose of this invention is to prepare layered composite hydroxide (LDH) with high specific surface area. The structural formula of this layered composite hydroxide is complex, which may involve multiple metals or combinations thereof. The preparation process requires two steps of precipitation respectively, and the reaction time longer

Method used

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  • A kind of zinc-aluminum layered material and its preparation method

Examples

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Effect test

Embodiment 1

[0033] Dissolve 2.4kg of zinc nitrate in 12L of water to make a solution containing zinc, and dissolve 0.32kg of sodium metaaluminate and 0.40kg of sodium carbonate in 5L of water to make a solution containing aluminum. Divide the zinc-containing solution into 4 equal parts, each 3L. Take 3L zinc-containing solution, control the system temperature to 75°C, add aluminum-containing solution dropwise to it until the pH value reaches 9.4; stop adding aluminum-containing solution dropwise, then add 3L zinc-containing solution dropwise to the mixing system, and continue to drop aluminum-containing solution Titrate until the pH value reaches 9.4; alternately titrate the aluminum-containing solution and the zinc-containing solution until all the zinc-containing solutions are added to the mixing system, and add the aluminum-containing solution dropwise until the pH reaches 9.4. The total titration time is 2 hours. The obtained mixture was aged at 75°C for 4h, cooled and washed until ne...

Embodiment 2

[0038] Dissolve 1.9kg of zinc chloride in 20L of water to form a zinc-containing solution, and dissolve 0.40kg of sodium metaaluminate and 0.80kg of sodium carbonate in 8.5L of water to form an aluminum-containing solution. Take 8L of zinc-containing solution, control the system temperature at 65°C, add aluminum-containing solution dropwise to it until the pH value reaches 9.1; the remaining zinc-containing solution is divided into 3 equal parts, each 4L. The aluminum-containing solution and the zinc-containing solution are alternately titrated until all the zinc-containing solutions are added to the mixing system, and the aluminum-containing solution is added dropwise until the pH reaches 9.1. The total titration time is 6 hours. The obtained mixture was aged at 76°C for 8 hours, cooled and washed until neutral, and dried in an air atmosphere at 90°C for 10 hours to obtain a zinc-aluminum layered material B with the molecular formula Zn 0.67 Al 0.33 (OH) 2.03 (CO 3 ) 0.15...

Embodiment 3

[0043] Dissolve 800g of zinc nitrate in 4L of water to form a zinc-containing solution, and dissolve 120g of sodium metaaluminate and 120g of sodium carbonate in 1.7L of water to form an aluminum-containing solution. Take 2L zinc-containing solution, control the system temperature at 60°C, add aluminum-containing solution dropwise to it until the pH value reaches 9, stop adding the aluminum-containing solution dropwise, add the remaining 2L zinc-containing solution dropwise to the mixing system, and continue to drop the Aluminum solution until the pH value reaches 9, the total titration time is 4h. The obtained mixture was aged at 85°C for 4h, cooled and washed until neutral, and dried in an air atmosphere at 120°C for 5h to obtain a zinc-aluminum layered material C with the molecular formula Zn 0.59 Al 0.63 (OH) 2.44 (CO 3 ) 0.195 ·6H 2 O, the molar ratio of zinc to aluminum is 0.94, and the specific surface area is 260m 2 / g.

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Abstract

The present invention relates to a zinc-aluminum layered material and a preparation method thereof, wherein the main composition of the zinc-aluminum layered material is represented by a chemical formula of ZnxAly(OH)z(CO3)m.nH2O, wherein x is a number selected from 0.55-0.75, y is a number selected from 0.13-0.7, z is a number selected from 1.55-2.50, m is a number selected from 0.15-0.20, n is a number selected from 1-10, the x / y value is a number selected from 0.75-5.70, and the specific surface area is 150-280 m<2> / g. According to the present invention, the zinc-aluminum hydrotalcite-like layered material is prepared under the non-constant pH value by alternately titrating the aluminum-containing sodium carbonate solution and the zinc-containing solution; and the prepared material has characteristics of large specific surface area and uniform zinc-aluminum dispersing, such that the prepared can be used for the catalysis material after the low temperature calcination of the prepared material as the precursor.

Description

technical field [0001] The invention relates to a zinc-aluminum layered material, which is mainly prepared by alternately titrating the non-constant pH of an aluminum-containing sodium carbonate solution and a zinc-containing solution to prepare a zinc-aluminum hydrotalcite structure layered material with uniform dispersion and a high specific surface area. The material can be used for adsorption and desulfurization materials, FCC catalyst sulfur reduction additives and hydrodesulfurization carriers. Background technique [0002] Composite materials of zinc oxide and alumina are often used as desulfurization catalytic materials in the fields of adsorption desulfurization and hydrodesulfurization. At present, the common preparation methods of this material include impregnation method, mechanical mixing method, co-precipitation method and peptization method. Among them, since the impregnation method and the mechanical mixing method use alumina material as a precursor, by adju...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/236B01J35/10C10G45/04
CPCC10G45/04B01J27/236C10G2300/202B01J35/615
Inventor 王廷海吴杰向永生张忠东高源姚文君李自夏王学丽
Owner PETROCHINA CO LTD
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