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Stabilized flash calcined gibbsite as a catalyst support

A catalyst carrier, gibbsite technology, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., to achieve high sodium tolerance and excellent thermal stability , the effect of high pore volume

Inactive Publication Date: 2008-12-10
BASF CATALYSTS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] Due to the unfavorable properties of rho-alumina, rho-alumina has not been used with TWC or other high temperature catalysts

Method used

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  • Stabilized flash calcined gibbsite as a catalyst support

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Preparation of rehydrated flash-calcined gibbsite:

[0047] 400 g of flash-calcined gibbsite (rho-alumina) (CP powder prepared by Almatis AC, Inc. of Vidalia, LA, with 268m 2 / g BET surface area and Na 2 (2 impurity 2500ppm) was added into 1600g of deionized (DI) water while stirring. 11.9 g of formic acid (98%, from VWR) was slowly added to the slurry with vigorous stirring. The acidified slurry was heated to 95°C and maintained at this temperature for 2 hours with stirring. After 2 hours, the slurry was filtered and washed three times with hot DI-water, and the solid was dried overnight at 105°C. The rehydrated flash-calcined gibbsite has 350-420m 2 / g surface area and Na 2 50-500ppm Na impurity represented by O.

Embodiment 2

[0049] Lanthanum oxide-doped rehydrated flash-calcined gibbsite (3% La) was prepared by incipient wetness impregnation:

[0050] 47.6g La(NO 3 ) 3 ·6H 2 O (from Alfa Aesar) was dissolved in 300 g DI-water. 550 g of the rehydrated flash-calcined gibbsite as formed in Example 1 were then impregnated with the above solution. The solid was dried and calcined in air at 815°C (1500°F) for 2 hours. The resulting lanthanum oxide-doped rehydrated flash-calcined gibbsite has about 120-150m 2 / g surface area.

Embodiment 3

[0052] Lanthanum oxide-doped rehydrated flash-calcined gibbsite (3% La) was prepared by spray drying:

[0053] From 3.5 lbs of rehydrated flash-calcined gibbsite as formed in Example 1, 4.9 lbs of DI-water, and 119 g La(NO 3 ) 3 ·6H 2 O (from Alfa Aesar) was made into a slurry. The slurry was spray dried and the microspheres were calcined in air at 815°C (1500°F) for 2 hours. The resulting lanthanum oxide-doped rehydrated flash-calcined gibbsite has 120-150m 2 / g surface area.

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Abstract

A low cost support useful in chemical reactions and automotive arts is formed by rehydrating a flash calcined gibbsite in an aqueous acidic solution. The rehydrated support can be subsequently stabilized by doping with a stabilizing metal such as lanthanum. The alumina support has excellent thermal stability, high sodium tolerance, high activity with low precious metal loading, and high pore volume and surface area.

Description

[0001] The present invention generally relates to novel alumina-based supports and their use in catalysts. Background of the invention [0002] It is well known that the efficiency of supported catalyst systems is generally related to the surface area on the support. This is especially true for systems using noble metal catalysts or other expensive catalysts. The greater the surface area, the more catalytic species is exposed to the reactants and less time and less catalytic species are required to maintain high productivity. [0003] Alumina (Al 2 o 3 ) is a well known support for many catalyst systems. Alumina is also known to have many crystalline phases such as α-alumina (commonly denoted as α-alumina or α-Al 2 o 3 ), γ-alumina (usually expressed as γ-alumina or γ-Al 2 o 3 ) and numerous alumina polymorphs. In the field of catalysis, γ-Al 2 o 3 Of particular importance are refractory inorganic oxides of wide technical importance which often serve as catalyst supp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/04B01J23/10B01J23/40B01J23/63B01J37/02
CPCB01D53/945B01D2255/206B01D2255/20707B01D2255/20715B01D2255/20723B01D2255/20738B01D2255/20746B01D2255/20753B01D2255/20761B01D2255/20769B01D2255/20776B01D2255/2092B01J21/04B01J23/10B01J23/40B01J23/63B01J37/0201C01F7/02C01F7/021C01P2006/12C01P2006/14C01P2006/16C01P2006/80Y02T10/12B01J35/02B01J37/02
Inventor X·D·杨
Owner BASF CATALYSTS LLC
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