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Alumina and its preparing process

A hydrated alumina, constant temperature technology, used in chemical instruments and methods, catalyst carriers, chemical/physical processes, etc., can solve the problems of active metal distribution (arrangement crowded, unfavorable for macromolecular hydrocarbon adsorption and reaction, etc., and achieve high Effect of Metal Chemical Dispersion Amount

Inactive Publication Date: 2005-01-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, for catalysts with large chemical dispersion of metals (such as MoO 3 MoNiP / Al with content>20w% 2 o 3 catalyst), because the distribution (arrangement) of active metals on the catalyst surface is relatively "crowded", which is not conducive to the adsorption and reaction of macromolecular hydrocarbons on its surface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 200g of alumina dry rubber powder (dry basis content is 68w%), add 4.0g KCl, 3.0ml acetic acid, 155ml HNO 3 (3%) and an appropriate amount of H 2 O. Mix well, knead into a plastic shape and extrude into clover strips (Φ=1.4mm). After air drying overnight, it was dried at 110°C for 2 hours.

[0024] Place the dried sample in a high-temperature furnace, raise the temperature to 200°C at a rate of 3°C per minute, and bake at this temperature for 2.0 hours at a constant temperature. Then, the temperature was raised to 485° C. at a rate of 4° C. per minute, and then roasted at a constant temperature for 2.0 hours at this temperature, and then the temperature was raised to 600° C. at a rate of 4° C. per minute, and roasted at a constant temperature at this temperature for 1.5 hours.

Embodiment 2

[0026] With embodiment 1. But instead of adding KCl, add KNO 3 5.5g.

Embodiment 3

[0028] With embodiment 1. But the final firing temperature is 720°C.

[0029] The physical and chemical properties of the above examples of carriers are shown in Table 1. The reference sample in Table 1 is γ-Al which is currently widely used as a carrier for hydroprocessing catalysts in China. 2 o 3 .

[0030] γ-Al 2 o 3 (prepared by the present invention)

[0031] As can be seen from the data in Table 1: the γ-Al prepared by the technology of the present invention 2 o 3 (Example 1, 2), its chemical dispersion reaches 29.0 MoO 3 w%, specific surface area 428m 2 / g. If the calcining temperature is further increased (by 600°C to 720°C), the average pore diameter is expanded from 7.11nm to 8.26nm (Example 3), while the specific surface area is still 380m 2 / g.

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PUM

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Abstract

The present invention is the preparation of one kind of alumina. The material pseudo-thin diasphore, i. e., alpha-AlO(OH) is mixed with additives, and the mixture is kneaded, extruded to form, dried and three-section constant-temperature roasted to obtain gamma-Al2O3. Compared with available technology, the gamma-Al2O3 of the present invention has 60-120 % higher chemical dispersed amount of metal on the surface, specific surface area of 350-450 sq m / g and average pore size of 8.0-12.0 nm.

Description

1. Technical field [0001] The present invention relates to a kind of γ-Al 2 o 3 Carriers and methods for their preparation. 2. Background technology [0002] Catalysts for hydrotreating of petroleum products (hydrodesulfurization, hydrodenitrogenation, hydrodemetallization, hydrogenation saturation, etc.) generally use γ-Al 2 o 3 Or γ-Al containing a small amount of other elements (such as Si, Ti, B, etc.) 2 o 3 As a carrier, metals such as Mo (or W) and Ni (or Co) are used as active components. [0003] When designing a hydrotreating catalyst, it is required that the metal can be highly dispersed on the surface of the support, and its chemical dispersion should be as large as possible, and this chemical dispersion is determined by the support, that is, γ-Al 2 o 3 depends on the surface properties. In addition, for catalysts with large chemical dispersion of metals (such as MoO 3 MoNiP / Al with content>20w% 2 o 3 catalyst), because the distribution (arrangement)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00
Inventor 罗锡辉何金海
Owner CHINA PETROLEUM & CHEM CORP