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Cristobalite as well as preparation method and application thereof

A cristobalite, weight technology, applied in chemical instruments and methods, condensation hydrocarbon production with dehydrogenated hydrocarbons, catalyst carriers, etc., can solve the problems of limited industrial application of products, high energy consumption, complex processes, etc. Low cost, low energy consumption and easy availability of raw materials

Active Publication Date: 2017-10-24
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of high energy consumption, complicated process and limited industrial application of products in the existing cristobalite preparation technology, and provide a kind of silicon dioxide as raw material, low energy consumption, simple process and product with potential industrial application value. Porous cristobalite and its preparation method and application in methane oxidative coupling reaction

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  • Cristobalite as well as preparation method and application thereof
  • Cristobalite as well as preparation method and application thereof
  • Cristobalite as well as preparation method and application thereof

Examples

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preparation example Construction

[0027] The present invention also provides a method for preparing cristobalite, the method comprising: contacting silicon dioxide with a tungstate solution and then drying, and keeping the dried solid at 600-850°C for 0.5-24h.

[0028] According to the method of the present invention, the weight ratio of the amount of silicon dioxide to the amount of tungstate solution can be 1:1-20, preferably 1:1-5; the concentration of the tungstate solution can be 0.01 -30% by weight, preferably 0.01-15% by weight, more preferably 0.01-8% by weight.

[0029] According to the method of the present invention, the dissolving and contacting of the silicon dioxide and the tungstate refers to uniformly mixing the silicon dioxide and the tungstate solution so that the silicon dioxide can be fully dispersed in the tungstate solution. The method of contacting the silicon dioxide with the tungstate solution is not particularly limited, as long as the silicon dioxide can be fully dispersed in the tun...

Embodiment 1

[0039] Weigh 0.28g of sodium tungstate, add 10g of distilled water, dissolve completely, then add 5g of silicon dioxide, stir well, place in a constant temperature drying oven at 120°C for 2 hours, and place the dried solid in a muffle furnace for 5 The temperature was raised to 700°C at a rate of °C / min, and kept at 700°C for 4 hours to obtain porous cristobalite. It can be seen from the calculation based on the amount of material fed that the obtained porous cristobalite contains 95.2% by weight of silicon dioxide and 3.6% by weight of tungsten components calculated as oxides. After measurement, the specific pore volume of the obtained porous cristobalite is 0.6777ml / g, the average pore diameter is about 788.6nm, and the most probable pore diameter is 568.5nm.

[0040] Get the cristobalite that makes, it carries out scanning electron microscope (SEM), X-ray diffraction (XRD) and pore size distribution detection to it, and detection result is respectively as follows figure 1...

Embodiment 2

[0042] Weigh 0.5g of sodium tungstate and add it into 15g of distilled water. After the dissolution is complete, then add 5g of silicon dioxide. After fully stirring, place it in a constant temperature drying oven at 110°C for 3 hours. The dried solid is placed in a muffle furnace and heated in 3 The temperature was raised to 750°C at a rate of °C / min, and kept at 750°C for 5 hours to obtain porous cristobalite. It can be known from the calculation based on the feeding amount of materials that the obtained porous cristobalite contains 91.8% by weight of silicon dioxide and 6.2% by weight of tungsten components calculated as oxides. After measurement, the specific pore volume of the obtained porous cristobalite is 0.51ml / g, the average pore diameter is about 526.4nm, and the most probable pore diameter is 496.7nm.

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Abstract

The invention discloses cristobalite, a preparation method of the cristobalite and application of the cristobalite serving as a carrier of a catalyst. The cristobalite has a porous structure; the specific pore volume of the cristobalite is 0.5 to 0.7ml / g, the average pore size is 400 to 900nm, most probable pore size is 400 to 850nm, and the cristobalite contains 70 to 99.9 weight percent of silicon dioxide and 0.1 to 30 weight percent of tungsten component counted by oxide. The cristobalite serving as the carrier of the catalyst has a stable property at high temperature; the cristobalite disclosed by the invention has intrinsic properties of cristobalite prepared by other methods, the porous structure and potential industrial application value, and is expected to develop a new industrial application field of the cristobalite. The method for preparing the cristobalite, disclosed by the invention has the advantages of simplicity, low requirement on equipment and low energy consumption; in addition, the silicon dioxide raw material is easily obtained and abundant in reserves, so that the production cost is low.

Description

technical field [0001] The invention relates to a cristobalite and its preparation method and application. Background technique [0002] Cristobalite is a kind of quartz, which is a silicon oxide compound, tetragonal, and has good properties such as high scattering, high whiteness, low density, bright color, corrosion resistance, scratch resistance, scrub resistance and good extinction effect. In recent years, cristobalite has been widely used in precision casting, electronic materials, biomaterials, aerospace and other fields, and the demand is increasing year by year, but the import price is relatively high. (Lei Yun et al., Silicate Bulletin, 2011). The currently known cristobalites are mostly non-porous structures with dense silicon skeletons and high thermal conductivity (2.5W / m.k at room temperature) (translated by Guo Jingrong, 1995). [0003] The content of cristobalite in nature is very small, and only exists in a small amount in volcanic rocks. Therefore, cristo...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J23/34B01J32/00C07C2/84C07C9/06C07C11/04C01B33/12
CPCC01B33/12C07C2/84B01J23/30B01J23/34C07C2523/34C07C2523/30B01J35/653B01J35/651B01J35/635C07C9/06C07C11/04Y02P20/52
Inventor 武洁花张明森柯丽赵清锐薛伟冯静邵芸
Owner CHINA PETROLEUM & CHEM CORP
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