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Catalytic cracking device

A technology of catalytic conversion and catalyst carrier, which is used in exhaust devices, mufflers, catalyst protection, etc., can solve the problem of not being able to obtain quality stability and tightening sealing materials.

Inactive Publication Date: 2005-11-09
IBIDEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is impossible to obtain a fastening sealing material excellent in quality stability

Method used

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Examples

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preparation example Construction

[0273] According to the preparation method of the first group of embodiments of the present invention, the precursor fiber is heated in an environment where it is difficult to oxidize the carbon component contained in the precursor fiber, thereby performing the calcination step of sintering the precursor fiber. Therefore, this allows a large amount of carbon components to remain in the aluminum silicon fiber 6, thus ensuring that the aluminum silicon fiber 6 having excellent mechanical strength can be easily obtained.

[0274] According to the preparation method of the first group of embodiments of the present invention, the environment in which the calcination step is performed uses an inexpensive nitrogen atmosphere. Therefore, this can reduce the production cost of the fastening seal material 4. In addition, since the heating step is performed within the preferred calcination temperature range, this can stably obtain high-strength aluminum-silicon fibers 6.

[0275] According t...

Embodiment 1

[0534] In Example 1, first, an alkaline aqueous solution of aluminum chloride (23.5 wt%), silica sol (20 wt%, the particle size of silica is 15 nm) and polyvinyl alcohol (10 wt%) were mixed to A spinning stock solution is prepared, and the polyvinyl alcohol is a drawing performance imparting agent. Then, the resultant spinning stock solution was concentrated using an evaporator under a vacuum of 50°C to obtain a spinning stock solution having a concentration of 38% by weight and a viscosity of 1500 poise.

[0535] After the spinning stock solution is prepared, the spinning stock solution is continuously discharged into the air through the nozzle (the cross section is a perfect circle) of the spinning equipment, and the obtained precursor fiber is wound up while drawing.

[0536] Secondly, the precursor fiber is heated (pretreatment), heated in an electric furnace at 250°C, atmospheric pressure and nitrogen atmosphere for 30 minutes, and then in the same way, heated in an electric ...

Embodiment 2 and 3

[0545] In Examples 2 and 3, aluminum-silicon fibers 6 were prepared in substantially the same order as in Example 1, except that the temperature and time of calcination were changed according to Table 1. As a result, aluminosilicate fibers 6 excellent in mechanical strength can be obtained.

[0546] In addition, when forming samples for the surface pressure test, the initial surface pressure, the surface pressure after the durability test, and the ratio of the surface pressure decrease over time were tested on these samples, and the results were optimized in the same manner as in Example 1. The results (see Table 1).

[0547] Of course, no changes in color and residual carbon content were observed.

[0548] In addition, the fastening sealing material 4 is prepared to obtain a catalytic converter 1, and the catalytic converter 1 is equipped with a continuous driving experiment. As a result, during driving, no noise was generated, and the catalyst carrier 2 did not turn black. There...

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Abstract

An object of the present invention is to provide a manufacturing method by which alumina-silica based fibers excellent in mechanical strength can be readily and securely obtained, and the present invention obtains precursor fibers as a material by using an alumina-silica based fiber spinning stock solution for use in an inorganic salt method. Next, the precursor fibers are heated under an environment which makes it difficult to carry out an oxidizing reaction on the carbon component contained in the precursor fibers. Thus, the precursor fibers are sintered to obtain alumina-silica based fibers.

Description

[0001] This application is a divisional application. The original international application number is PCT / JP02 / 05124, the Chinese national application number is 02801846.X, the filing date is May 27, 2002, and the title of the invention is "aluminum silicon fiber, ceramic fiber" , Ceramic fiber aggregates, fastening and sealing materials and preparation methods thereof, and preparation methods of alumina fiber aggregates". Technical field [0002] The invention relates to aluminum-silicon fibers, ceramic fibers, ceramic fiber aggregates, fastening and sealing materials and preparation methods thereof, as well as preparation methods of alumina fiber aggregates. Background technique [0003] Exhaust gas emitted from internal combustion engines of vehicles such as buses, trucks, and construction machinery contains fine particles that affect the environment and the human body, which has become a problem. [0004] Various existing ceramic fibers allow the exhaust gas to pass through po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01J33/00B01J35/06C04B35/80D04H1/4234F01N3/28
CPCD01D5/253C04B2235/80C04B2235/3418F01N3/2853C04B35/117C04B35/803C04B2235/3218C04B2235/6567D01F9/10F01N3/2864D01D5/04C04B2235/526C04B2235/656C04B2235/5284C04B2235/422C04B2235/5264B82Y30/00C04B35/634F01N2330/06C04B2235/96F01N2350/04C04B35/00F01N2330/14C04B2235/658C04B35/62245C04B2235/9661Y10T428/2973C04B35/80
Inventor 棚桥一智堂下正景高桥秀智
Owner IBIDEN CO LTD
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