Preparation method for silicon-aluminium composite oxide with controllable pore structure

A composite oxide and pore structure technology, which is applied in chemical instruments and methods, chemical/physical processes, catalyst supports, etc., can solve the problems of small pore size, uneven distribution of silicon and aluminum, and non-concentrated pore size distribution to achieve high selectivity , suitable activity, effective ingredients to improve the effect

Active Publication Date: 2015-11-18
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These preparation methods have the disadvantages of uneven distribution of silicon and aluminum, small pore size or non-concentrated pore size distribution.

Method used

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  • Preparation method for silicon-aluminium composite oxide with controllable pore structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take SiO 2 Put 1.5L of water glass solution with a content of 55-150g / L in the glue tank, add Al at a certain flow rate 2 o 3 The aluminum sulfate solution with a content of 50-90g / L stops feeding until the pH value is 8.0-9.0. After the gelation is completed, put the above slurry into the autoclave, raise the temperature to 120°C, and keep it for 2h. After the reaction, separate the solid from the liquid and wash , to obtain a product filter cake from which impurities are removed, the filter cake is dried and pulverized to obtain a silicon-aluminum composite oxide powder.

Embodiment 2

[0027] Take SiO 2 Put 1.5L of acidic silica sol solution with a content of 55-150g / L in the gel-forming tank, and add Al at a certain flow rate 2 o 3 The sodium metaaluminate solution with a content of 50-90g / L stops feeding until the pH value is 7.0-8.0. After the gelation is completed, put the above slurry into the autoclave, raise the temperature to 140°C, and keep it for 2h. After the reaction is finished, the solid-liquid is separated and washed to obtain a product filter cake from which impurities are removed. The filter cake is dried and pulverized to obtain a silicon-aluminum composite oxide powder.

Embodiment 3

[0029] Take SiO 2 Put 1.5L of alkaline silica sol solution with a content of 55-150g / L in the gel-forming tank, and add Al at a certain flow rate 2 o 3 The aluminum sulfate solution with a content of 50-90g / L stops feeding until the pH value is 6.0-7.0. After the gelation is completed, put the above slurry into the autoclave, raise the temperature to 160°C, and keep it for 10h. After the reaction is finished, the solid-liquid is separated and washed to obtain a product filter cake from which impurities are removed. The filter cake is dried and pulverized to obtain a silicon-aluminum composite oxide powder.

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Abstract

The invention discloses a preparation method for a silicon-aluminium composite oxide with a controllable pore structure. The preparation method is characterized by comprising the following steps: neutralizing an aluminium source compound and a silicon source compound to form gel under normal pressure; after the gel is formed, and transferring the gel into a high-pressure kettle; controlling certain conditions to perform hydrothermal aging, performing solid-liquid separation, washing and drying to obtain silicon-aluminium composite oxide powder with different pore sizes. Compared with the prior art, neutralizing-hydrothermal treatment is performed on the silicon-aluminium composite oxide in the method, so that reactants are fully and uniformly mixed; an effective mutual effect between silicon atoms and aluminium atoms is ensured; the syneresis depth of silicon-aluminium gel is regulated by controlling different hydrothermal conditions and hydrothermal times, so that the gels with different skeleton strengths are obtained; therefore, the pore structure of the silicon-aluminium gel can be regulated in a lager range; the proportion of the effective pore accounting for the prepared silicon-aluminium composite oxide is obviously improved; 80 percent of the pores are distributed within the range of +/-2nm in a concentrated manner.

Description

Technical field: [0001] The invention belongs to the field of preparation of inorganic materials, and relates to a method for preparing a silicon-aluminum composite oxide with a controllable pore structure, in particular to a method for preparing a silicon-aluminum composite oxide with adjustable pore diameter and concentrated pore distribution by neutralization-hydrothermal reaction method. Background of the invention: [0002] As the carrier or active component of supported catalysts, silicon-aluminum composite oxides have been widely used in various catalytic fields, especially in the field of catalytic cracking and hydrocracking technology in the oil refining industry. With the increasingly inferior and heavy quality of petroleum resources, there are a large number of organometallic compounds and asphaltenes in raw oil, requiring various petroleum refining catalyst supports to have a large enough pore size for diffusion to prevent or slow down catalyst poisoning or deact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/12B01J32/00B01J35/10
Inventor 于海斌谢献娜孙彦民周鹏李晓云曾贤君姜雪丹李世鹏隋云乐张学斌张雪梅
Owner CHINA NAT OFFSHORE OIL CORP
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