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Coating catalyst for catalytic gaseous phase oxidation of aromatic hydrocarbons

A catalyst and catalytic gas technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, etc., can solve the problem of unsatisfactory phthalic anhydride production, multi-layer coating The problem of unsatisfactory cloth catalysts, etc., to achieve the effect of improving selectivity and yield

Inactive Publication Date: 2003-09-24
BASF AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect that this new type of catalytic material improves upon how it works for producing certain chemicals called Phthaquinone acid (PHA).

Problems solved by technology

Technologies aim to solve technical problem addressed in this patents relating to improving the efficiency and performance of catalyst systems used in chemical vapor phase oxidations. Specifically, there were developed various techniques involving multiple layers where certain elements like transition metals could be included during the formation of coatings. Additionally, they resulted in improved specificities achieved due to better control over the concentrations of each component inside the layer being formed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Preparation of Coated Catalyst Ia - Comparison

[0040] will comprise 250.0 grams of anatase with a BET surface area of ​​20 m2 / g, 13.6 grams of vanadyl oxalate (= 7.98 grams of V 2 o 5 ), 1.37 g of cesium sulfate (=1.01 g of Cs), 940 g of water and 122 g of formamide were dried in a spray dryer at a gas inlet temperature of 280° C. and a drying gas (air) outlet temperature of 120° C. , Obtain 270 grams of powder with a particle size of 3-60 microns accounting for 90% by weight. After the powder is calcined (calcined at 400°C for 1 hour), the calcined powder is mixed with 10 grams of melamine, and a talc (magnesium silicate) ring with an outer diameter of 8 mm, a length of 6 mm, and a wall thickness of 1.5 mm is placed at 20°C. 93 g of the melamine-containing powder were coated with a coating drum for 20 minutes with the addition of 56 g of a mixture of 30% by weight of water and 70% by weight of glycerin. The catalyst support which had been coated in this...

Embodiment 2

[0041] Example 2: Preparation of Coated Catalyst 1b - Comparison

[0042] The procedure of Example 1 was repeated, but using anatase comprising 400.0 g of BET surface area 21 m2 / g, 57.6 g of vanadyl oxalate (=33.8 g of V 2 o 5 ), 2.75 g of cesium sulfate (=2.02 g of Cs), 14.4 g of antimony trioxide, 2.5 g of ammonium dihydrogen phosphate (=0.67 g of P), 1500 g of water and 196 g of formamide. The catalytically active composition of the coating comprises 0.15% by weight of phosphorus (as P), 7.5% by weight of vanadium (as V 2 o 5 In terms of), 3.2% by weight of antimony (as Sb 2 o 3 ), 0.45% by weight of cesium (calculated as Cs) and 89.05% by weight of titanium dioxide.

Embodiment 3

[0043] Example 3: Preparation of Coated Catalyst Ic - Comparison

[0044] The procedures of Examples 1 and 2 were repeated except that 46 grams of the powder described in Example 1 was first applied to the support, followed by 47 grams of the powder described in Example 2.

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Abstract

A coated catalyst for the catalytic gas-phase oxidation of aromatic hydrocarbons, which is a catalytically active composition containing a certain amount of vanadium oxide, titanium dioxide, cesium compound, phosphorus compound and antimony oxide on an inert, non-porous carrier, wherein the catalytic The active composition is applied in two or more layers, with the antimony oxide content of the outer layer being 50-100% lower than that of the inner layer or each inner layer, wherein the amount of the catalytically active composition in the inner layer or each inner layer is the amount of the catalytically active composition 10-90% by weight of the catalyst can be used for the preparation of carboxylic acids and/or acid anhydrides, especially phthalic anhydride, and the invention also provides a production method for these catalysts.

Description

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Claims

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Application Information

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Owner BASF AG
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