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Layered composite carrier for producing shell shaped catalyst

A layered composite, catalyst technology, applied in physical/chemical process catalysts, hydrocarbons, hydrocarbons, etc., can solve the problems of low selectivity, low dispersion of precious metals, and small specific surface area

Active Publication Date: 2009-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the specific surface area of ​​the layered composite carrier in the prior art is small, and the thin shell-shaped catalyst produced has low dispersion degree, poor utilization rate and low selectivity of precious metals. Layered Composite Support for Preparation of Thin Shell Catalysts

Method used

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  • Layered composite carrier for producing shell shaped catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018]40 grams of alumina sol (containing 15% alumina by mass ratio), 60 grams of 2% glycerin solution, and 0.5 grams of Span 80 were made into a slurry. Then add 0.5 grams of potassium feldspar and 40 grams of jet-milled γ-Al with a particle size below 100 microns to this mixture. 2 o 3 powder (specific surface area 230 m 2 / gram). After stirring for about ten minutes, the slurry was ball milled at room temperature for 4 hours to control the particle size below 20 microns. The slurry was sprayed onto quartz pellets with a particle size of 4 mm, and the coating loading was controlled by controlling the spraying time. After spraying, dry at 80°C for 2 hours, then raise the temperature to 100°C and dry again for 2 hours, and finally bake at 900°C for 6 hours to obtain a layered composite carrier A. The physical and chemical properties are shown in Table 1.

Embodiment 2

[0020] θ-Al 2 o 3 (Specific surface area 180 meters 2 / g) the powder is pulverized and sieved by air flow, and its particle size is controlled below 20 microns to obtain ultrafine θ-Al 2 o 3 pink. 40 grams of alumina sol (containing 15% by mass ratio of alumina), 60 grams of 3% polyacrylamide solution, and 0.4 grams of betaine were prepared into slurry. Then add 0.3 grams of calcium silicate, 40 grams of ultrafine θ-Al to this mixture 2 o 3 pink. After stirring for about ten minutes, the slurry was ball milled at room temperature for 2 hours to control the particle size below 10 microns. Slurry spraying to α-Al with a particle size of 4 mm 2 o 3 On the pellets, dry at 80°C for 2 hours, then raise the temperature to 150°C and dry again for 2 hours, and finally bake at 800°C for 10 hours to obtain a layered composite carrier B. The physical and chemical properties are shown in Table 1.

Embodiment 3

[0022] 30 grams of alumina sol (containing 25% aluminum oxide by mass ratio), 5 grams of 40% silica sol, 60 grams of 4% cyclodextrin solution, and 1.0 gram of cetyltrimethylammonium bromide are made into slurry . Then add 0.4 grams of calcium silicate, 0.3 grams of potassium carbonate and 50 grams of δ-Al with a particle size of less than 100 microns after ball milling to this mixed solution. 2 o 3 powder (specific surface area 160 m 2 / gram). After stirring for about twenty minutes, the slurry was ball milled at room temperature for 3 hours to control the particle size below 1 micron. The slurry was sprayed onto mullite pellets with a particle size of 4 mm, dried at 80°C for 2 hours, then heated to 150°C and dried again for 2 hours, and finally calcined at 950°C for 6 hours to obtain a layered composite carrier C. The physical and chemical properties are shown in Table 1 .

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Abstract

The invention relates to a layered composite carrier used for preparing thin-shell catalysts, and solves the technical problems that the prior layered composite carrier has small specific surface area, and the relevant thin-shell noble metal catalyst has low dispersity, poor utilization rate and low selectivity. In order to solve the problems, the technical scheme is as follows: the layered composite carrier used for preparing thin-shell catalysts, comprises an inert carrier inner core and a porous coating as outer layer conjugated on the inner core. The carrier inner core is at least one substance selected from alpha-Al2O3, theta-Al2O3, metals, SiC, cordierite, zirconium oxide, titanium oxide, quartz, mullite and Al-rich andalusite. The porous coating is at least one substance selected from gamma-Al2O3, delta-Al2O3, eta-Al2O3, theta-Al2O3, silicon oxide / aluminum oxide, zeolite, non-zeolite molecular sieves, titanium oxide and zirconium oxide. The layered composite carrier is applied to the industrial production of thin-shell catalysts.

Description

technical field [0001] The invention relates to a layered composite support for preparing thin-shell catalysts. Background technique [0002] At present, a considerable part of catalysts used in chemical and oil refining processes are supported catalysts using noble metals as active components. Because precious metals are expensive, their content in catalysts tends to be low. Studies have found that the non-uniform distribution of active components in the carrier can reduce the amount of precious metals and improve the utilization of precious metals; at the same time, in many reactions, catalysts with non-uniform distribution also show better activity, selectivity and life. The most important one is the eggshell catalyst, that is, the surface thin shell type with active components concentrated on the surface of the carrier. When the rate<<intrinsic reaction rate, if the reaction rate is very fast, the reactant molecules will react as soon as they diffuse into the ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/62B01J21/16C07C15/46C07C5/333
Inventor 李应成顾国耀翁漪马春景
Owner CHINA PETROLEUM & CHEM CORP
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