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Porous body and its manufacturing method

A manufacturing method and technology of porous bodies, applied in the field of porous bodies, can solve problems such as the failure to achieve the pH rise suppression effect, and achieve the effect of easy control and enlarged specific surface area

Inactive Publication Date: 2011-11-30
NIPPON SHEET GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the research of the inventors of the present application, the effect of suppressing the rise in pH by using montmorillonite has not reached a satisfactory level.

Method used

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  • Porous body and its manufacturing method
  • Porous body and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-8

[0068] (embodiment 1-8, comparative example 1-5)

[0069] The non-porous glass powder (powder body A; D that contains soda-lime glass) 50 =20μm), clay mineral powder (powder B; D 50 =50μm), sodium chloride powder (powder C; D 50 = 20 μm), methyl cellulose (organic binder; 2 g), and the total mass of powders A-C was 100 g, and the mass ratio of powders A-C was mixed in the ratio shown in Table 1 to prepare a mixed raw material. In addition, the said soda lime glass has a composition whose total content of an alkali metal oxide is about 14 mass %.

[0070] Then, cylindrical pellets with a diameter of 2 to 3 mm and a height of 2 to 6 mm were obtained from the mixed raw materials using an extrusion molding machine. Next, the pellets were fired for 2 hours in an electric furnace kept at a predetermined temperature inside (however, the firing was carried out for 3 hours in Comparative Example 12) to obtain a granular fired body.

[0071] Thereafter, the granular fired body was w...

Embodiment 9-17

[0084] (embodiment 9-17, comparative example 6-12)

[0085] In the same manner as above, 2 g of the obtained granular porous body was put into 20 g of a test liquid, and the pH of the test liquid 10 days later was measured. During the measurement, the temperature of the test liquid was kept at 25°C. The results are shown in Table 2.

[0086] 【Table 2】

[0087]

[0088] The results of Comparative Examples 7 to 10 showed that the pH of the test solution (aqueous solution) was increased by the elution of the alkali component from the powder A. By comparing Examples 9 and 10 with Comparative Examples 6 and 7, it was confirmed that the presence of the powder B suppressed the change in pH of the aqueous solution. This pH adjustment function is derived from the ion exchange capability of mordenite (mordenite has the function of controlling the pH of an aqueous solution to around 7).

[0089] The pH control region of the aqueous solution differs depending on the clay mineral. ...

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Abstract

The present invention provides a porous body with pH adjustment function. The porous body includes: powder A of glass containing an alkali component, powder B of a crystal selected from at least one of a) clay mineral having a layered crystal structure and b) zeolite, and a water-soluble inorganic salt. powder C; and the porous body is obtained by a method comprising the steps of: preparing powder B in the range of 0.05 to 3 parts by mass and powder C in the range of 0.2 to 4 parts by mass relative to 1 part by mass of powder A The process of forming a mixture of the mixture, the process of forming a molded body from the mixture, the process of firing the molded body at a temperature lower than the melting point of the water-soluble inorganic salt and above the softening point of the glass to make a fired body, and washing from the fired body The process of extracting water-soluble inorganic salts and making granular porous bodies. Among them, powder B is a crystal that is at least one selected from 1:1 type minerals, 2:1 type minerals other than montmorillonite minerals, mixed layer minerals, 2:1 ribbon type minerals, and zeolites. main body.

Description

technical field [0001] The present invention relates to porous bodies, and more particularly to methods for their manufacture. The porous body obtained by the present invention can be used as, for example, a catalyst carrier. Background technique [0002] A porous body used as a carrier of a catalyst or the like preferably has a large specific surface area. In addition, the carrier is also expected to have excellent strength and heat resistance. Glass is a material capable of satisfying the above-mentioned properties required for a carrier, and is chemically stable and excellent in formability. Therefore, studies on glass-based porous bodies are progressing. [0003] JP 2002-321988 A discloses a method for producing a porous body of a mixture of fired slag glass and clay. When this mixture is heated to a high temperature and fired, the slag glass is foamed, and the foamed slag glass is bonded to each other through clay to obtain a porous body. In order to fully foam the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00B01J32/00
CPCC04B2235/349C04B38/04C04B2111/0081C04B2235/36C04B2235/3463C04B35/19C04B35/18
Inventor 江森郁子高桥康史
Owner NIPPON SHEET GLASS CO LTD
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