Preparation method of low-sodium active aluminum oxide

A technology of activated alumina and alumina, applied in chemical instruments and methods, aluminate/alumina/aluminum hydroxide purification, inorganic chemistry, etc., can solve problems such as high cost, high sodium, silicon content, high impurity content, etc. , to achieve the effects of low production cost, porous volume, and simple preparation method
CN102070169AInactive Publication Date: 2011-05-25GUIZHOU BRANCH CHINA ALUMINUM IND
2 Cites 28 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUIZHOU BRANCH CHINA ALUMINUM IND
Publication Date
2011-05-25
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
Patent Text Reader

Abstract

The invention relates to a preparation method of low-sodium active aluminum oxide, in particular to a preparation method of active aluminum oxide used as catalyst carrier for cleaning automobile tail gas. The method is characterized by comprising the following steps: roasting aluminum hydroxide to obtain an intermediate product rho aluminum oxide, adding a sodium removal agent and a pore expanding agent to carry out hydrothermal treatment, filtering the treated slurry, washing with hot pure water, drying, dispersing the dried product with a dispersion machine, and calcining to obtain active aluminum oxide. In the method provided by the invention, any one or more than two of nitric acid, acetic acid and citric acid is / are used as the sodium removal agent to wash the intermediate product after the roasting of aluminum hydroxide, thereby lowering the sodium content. The low-sodium active aluminum oxide prepared from aluminum hydroxide has the advantages of larger specific surface, multiple pores, high pore volume, simple preparation method and lower production cost.
Need to check novelty before this filing date? Find Prior Art

Description

Technical field

[0001] A method for preparing low-sodium activated alumina relates to a method for preparing activated alumina as a catalyst carrier for purifying automobile exhaust. Background technique

[0002] Activated alumina has a large specific surface area, a variety of pore structures and pore size distributions, as adsorbents, catalysts, catalyst carriers, etc., used in medicine, chemical industry, water purification, chemical analysis, waste gas treatment and other fields.

[0003] The automobile exhaust purification catalyst uses a variety of catalyst metals to simultaneously purify HC (carbon nitrogen compounds), CO (carbon monoxide), and NOx (nitrogen oxides). Therefore, it is required that the activated alumina as the catalyst carrier has a large Specific surface area, lower content of harmful impurities and higher thermal stability.

[0004] At present, activated alumina for exhaust gas purification at home and abroad is mainly produced by calcination at a certain te...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More