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Solid phase preparation method for gamma-alumina with gradient distribution holes

A solid-phase preparation, gradient distribution technology, applied in alumina/hydroxide preparation, chemical instruments and methods, alumina/aluminum hydroxide and other directions, can solve the problem of high raw material cost and production cost, pseudo-boehmite glue Solubility becomes poor, extrusion molding operation is difficult and other problems, so as to achieve the effects of not easy carrier collapse, low raw material cost and production cost, and simple method

Inactive Publication Date: 2013-01-02
PETROCHINA CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the chemical pore-enlarging agent is used alone, the peptization of pseudo-boehmite becomes poor, which brings certain difficulties to the extrusion molding operation.
CN1256969A etc. propose to adopt two kinds of alumina with different forms, and use two kinds of pore-enlarging agents, physical pore-enlarging agent and chemical pore-enlarging agent, to obtain an alumina carrier with suitable performance, but the preparation process is complicated, and the raw material cost and production cost are relatively high. high

Method used

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  • Solid phase preparation method for gamma-alumina with gradient distribution holes
  • Solid phase preparation method for gamma-alumina with gradient distribution holes
  • Solid phase preparation method for gamma-alumina with gradient distribution holes

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Weigh 30.0 g of aluminum nitrate, 15.8 g of ammonium bicarbonate and 0.3 ml of polyethylene glycol, mix and grind for 20 min. Aging at 80°C for 7 hours and drying at 120°C for 2 hours to obtain the precursor aluminum ammonium carbonate. The resultant was calcined at 500°C for 4 hours to obtain γ-alumina powder a, whose physical and chemical properties are shown in Table 1.

Embodiment 2

[0027] Weigh 10-50.0 grams of aluminum nitrate, 15.8 grams of ammonium bicarbonate and 0.3 ml of polyethylene glycol, mix and grind for 20 minutes. Aging at 80°C for 7 hours and drying at 120°C for 2 hours to obtain ammonium aluminum carbonate. The resultant was calcined at 500°C for 4 hours to obtain γ-alumina powder b, whose physical and chemical properties are shown in Table 1.

Embodiment 3

[0029] Weigh 10-50.0 grams of aluminum nitrate and 15.8 grams of ammonium bicarbonate to grind into powder, mix and grind for 20 minutes. Aging at 80°C for 7 hours and drying at 80°C for 2 hours to obtain the precursor ammonium aluminum carbonate. The resultant was calcined aerobically at 500°C for 4 hours to obtain γ-alumina powder c, whose physical and chemical properties are shown in Table 1.

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Abstract

The invention relates to a solid phase preparation method for gamma-alumina with gradient distribution holes. The method comprises: adopting a solid phase reaction to obtain a precursor ammonium aluminum carbonate hydroxide, and carrying out calcination to obtain gamma-alumina with a high specific surface area, gradient distribution holes and a large pore volume. The most prominent characteristic of the present invention comprises adopting a raw material solid phase reaction synthesis technology and controlling the property of the resulting gamma-alumina through synthesis conditions. In addition, the method of the present invention has characteristics of simpleness, easy operation, no requirement of addition of a pore-expanding agent, and cost saving, and is suitable for industrial mass production.

Description

technical field [0001] The invention relates to a solid-phase preparation method of gamma-alumina with gradient distribution pores, which is a preparation method of a catalyst carrier. Its technical feature is that aluminum salt, ammonium salt and inducer are mixed and ground at room temperature, and then crystallized in a closed container according to given conditions to obtain basic ammonium aluminum carbonate with a specific shape, which is obtained after drying and roasting. A new method for gradient distribution of porous gamma-alumina. Background technique [0002] In recent years, the world's oil refining and processing industry is facing the severe challenge of increasingly heavy and inferior crude oil resources. Catalytic cracking is one of the most important means for the conversion of heavy oil (including residual oil) to produce light oil products and chemical raw materials. However, at present, catalytic cracking technology is not suitable for processing feeds...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01F7/30B01J32/00B01J21/04
Inventor 赵瑞玉刘晨光杨朝合张孔远殷长龙赵会吉柴永明赵愉生赵元生胡小夫
Owner PETROCHINA CO LTD
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