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Method for making silica shaped bodies

A silica, amorphous silica technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc. Formed body, etc.

Inactive Publication Date: 2009-02-25
EXXON RES & ENG CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although silica shaped bodies have been known for a long time and are commercially available in various forms, for technical and economical reasons it is not easy to obtain macroporous silica shaped bodies on a large industrial scale
One technical problem with forming particulate inorganic materials such as silica is that it is difficult to form a suitable plasticized mixture that can be processed in conventional particle forming equipment such as extruders

Method used

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  • Method for making silica shaped bodies
  • Method for making silica shaped bodies
  • Method for making silica shaped bodies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] In this example, the properties of various commercially available vectors were determined. Table 1 lists the properties of each shaped body.

[0060] Table 1

[0061]

[0062] 1 n.a. is not available

[0063] 2 below detection limit

[0064] 3 Based on manufacturer's instructions

[0065] 4 bimodal

Embodiment 2

[0067] In this example, shaped bodies IV of example 1 were brought into contact with water vapor at different temperatures.

[0068] Calcination and steaming experiments were carried out in a horizontal quartz tube preheated to a specific temperature in a horizontal furnace at one atmospheric pressure. The atmosphere inside the quartz tube consists of 100% water vapor. In a typical experiment, 11 grams of "billet" extrudate was loaded into a quartz boat and the boat was inserted into the center of a quartz tube at a specified temperature. After a specified duration, the quartz boat was removed from the quartz tube and cooled to room temperature.

[0069] The properties of the shaped bodies obtained after the steam treatment are given in Table 2.

[0070] Table 2

[0071]

[0072] This example shows that steaming shaped body IV at temperatures between 650°C and 815°C results in shaped bodies with lower surface area, lower pore volume and larger pore size.

Embodiment 3

[0074] a. Lancaster Muller method

[0075] 1022g of Ultrasil VN3SP silica was added to the Lancaster Muller pan and milled for 3 minutes using 1734kPa (250psi) on a Lancaster Muller wheel to give a fine powder. Subsequently, 706 g of Nyacol 2034DI was added to the Lancaster Muller and grinding was applied for an additional 3 minutes. A solution of 48 g of PVA dissolved in 500 g of deionized water was added to the Lancaster Muller, followed by an additional 562 g of deionized water.

[0076] The composition of the mixture is summarized in Table 3.

[0077] table 3

[0078] components solid(%) composition(%) Solid weight (g) "As is" weight (g) Ultrasil VN3SP 93.9 80 960 1022 Nyacol 2034DI 34 20 240 706 water 1062 Total (without PVA) 43 100 1200 2839 PVA 4 48

[0079] Grinding was applied to the now dry mixture and after 25 minutes the mixture started to clot and appear wet. After milling for 30 minutes, the...

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PUM

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Abstract

This invention relates to a method for making shaped bodies having a silica content of at least 85 wt%, to shaped bodies made by such method, to catalyst compositions comprising shaped bodies made by such methods and to catalytic conversion processes using catalyst compositions comprising shaped bodies made by such methods. The method of making the shaped bodies comprises the steps of a) forming shaped bodies from a mixture obtained from at least one amorphous silica powder, at least one silica sol having a pH below 7, and at least one polymeric organic extrusion aid, optionally supplemental liquid medium and optionally crystallites of a zeolite or zeolite-type material; b) drying the shaped bodies obtained in step a); and c) heating the shaped bodies to a temperature ranging from about 500 DEG C to about 800 DEG C.

Description

technical field [0001] The present invention relates to a method for the preparation of shaped bodies, to shaped bodies obtained by this method, to catalyst compositions comprising shaped bodies obtained by this method and to the use of shaped Catalytic conversion process of bulk catalyst composition. Background technique [0002] Many industrial processes use active materials that need to be supported on or incorporated in shaped bodies so that they can be handled and packed in reactors. Examples of such catalysts include supported metals, supported metal complexes, supported organometallics, bound zeolites, and bound zeolite-type materials. Shaped bodies are usually made from silica, alumina, aluminosilicates and other types of inorganic refractory oxides. Shaped inorganic oxide catalysts are generally prepared by forming a mixture of one or several sources of inorganic oxide in a suitable vehicle, usually water, an organic solvent or a mixture thereof. The mixture is f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/08
Inventor 琼·W·贝克曼贾森·吴西奥多·E·达茨拉尔夫·德哈斯
Owner EXXON RES & ENG CO