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Dual-pore composite alumina material

A technology of composite alumina and small-pore alumina, which is applied in the direction of catalyst carriers, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of dispersion and peptization, reduce the yield of liquid products, etc., and achieve good thermal stability , Appropriate pore size distribution, conducive to the effect of diffusion

Inactive Publication Date: 2013-10-30
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time TiO 2 and SiO 2 in Al 2 o 3 The surface is uniformly dispersed, and the invention contains Ti, Si and Al 2 o 3 Has good peptization, eliminates conventional silicon-containing Al 2 o 3 Dispersed pore distribution and poor peptization. The titanium-silicon-alumina carrier of the invention has a large pore size, with an average pore size of 10-15 nm, and can be used for the preparation of large-pore hydrotreating catalysts or hydroconversion catalysts. However, due to Has a strong surface acidity, which reduces the yield of liquid products

Method used

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  • Dual-pore composite alumina material

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preparation example Construction

[0021] In the preparation process of the double-hole composite alumina material in the present invention, extrusion aids can be used for extruding, and the commonly used extrusion aids can be kale powder, citric acid, oxalic acid, cellulose, starch, and polymer surfactants. One or more of them, preferably scallop powder, citric acid and polymer surfactant.

[0022] The shape of the double-hole composite alumina material of the present invention can be flake, spherical, cylindrical strip or special-shaped strip (clover, four-leaf clover), preferably cylindrical strip and special-shaped strip (clover, four-leaf clover). The diameter of the catalyst can be a thin strip of 0.8 mm to 2.0 mm or a thick strip >2.5 mm, preferably a thin strip of 1.0 mm to 1.8 mm.

Embodiment 1

[0025] Get 10g of small-pore pseudo-boehmite, 90g of large-pore pseudo-boehmite, add 5g of fenugreek powder, mix well, add dropwise a mixture of 7.5g of nitric acid (68wt.%), 5g of citric acid and 100g of deionized water. The solution was kneaded, extruded into a clover shape of 1.5mm, dried at 120°C for 2 hours, and then calcined at 550°C for 4 hours to make a double-porous composite alumina material A.

Embodiment 2

[0027] Take 20g of small-pore pseudo-boehmite, add 5g of scallop powder to 80g of large pores, mix well, add dropwise a mixed solution consisting of 7.5g of nitric acid (68wt.%), 5g of citric acid and 100g of deionized water and knead, extrude Form a clover shape of 1.5 mm, dry at 120°C for 4 hours, and then bake at 550°C for 4 hours to make a double-porous composite alumina material B.

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Abstract

The invention relates to a dual-pore composite alumina material, consisting of the following components in percentage by weight: 0.5-60% of small-hole alumina, 10-80% of large-hole alumina and 0.5-30% of a small-grain titanium silicon molecular sieve, wherein the titanium silicon molecular sieve is ETS-10 and is subjected to hydrothermal treatment or alkali treatment modification, the grain size of the molecular sieve is less than 0.5 micron, the specific area of the material is 200m<2> / g-400m<2> / g, the pore volume is 0.30ml / g-0.60ml / g, the distribution of the pores of which the pore sizes are 3-6nm accounts for 10-40% of the total pore volume, and the distribution of the pores of which the pore sizes are 8-20nm accounts for 60-90% of the total pore volume. The dual-pore composite alumina material is used for preparing an adsorbent and a catalyst carrier.

Description

technical field [0001] The invention relates to a dual-pore composite alumina material, in particular to a composite alumina material with dual-pore distribution suitable for components such as adsorbents and catalysts. Background technique [0002] Alumina is widely used as a catalyst carrier because of its suitable specific surface area and pore structure, good hydrothermal stability, suitable acidity and other properties. Al 2 o 3 as the carrier of the main component. [0003] In the actual application process, the alumina powder material is usually made into particles with a certain shape and size after molding. The pores in these particles are the inevitable channels for the diffusion of substances. In the field of catalyst application, different catalysts require different pore structures. Generally, the large pores of alumina are the passages for the reactant substances to enter the interior of the catalyst; while the small or medium pores with abundant surface a...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J29/89C10G45/12
Inventor 温广明张文成申宝剑郭金涛李景张志华田然赵野王丹李群英王元琪张凤军李艳晗李凤铉徐伟池张铁珍张全国孙生波宋金鹤王甫村
Owner PETROCHINA CO LTD
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