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Noble metal/TiO2-C catalyst and preparation method thereof

A catalyst and precious metal technology, applied in the field of precious metal/TiO2-C catalyst and its preparation, can solve problems such as difficulty in hydrogenation of colored impurities, and achieve the effects of abundant mesopores, good activity and improved conversion rate

Active Publication Date: 2012-05-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Pd / TiO for the crude terephthalic acid hydrorefining process in the prior art 2 Catalysts have disadvantages such as difficult hydrogenation of colored impurities. The purpose of the present invention is to provide a TiO 2 - Highly active noble metal / TiO with C as the carrier 2 -C Catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) 2 g phenolic resins are added in 20 g ethanol, obtain the ethanolic solution containing phenolic resins;

[0048] (2) The specific surface area of ​​20 g is 300 m 2 / g, pore volume 0.6 cm 3 / g, anatase TiO 2 16 g of the powder was added to the ethanol solution containing phenolic resin obtained in (1), stirred evenly at room temperature, and the ethanol was evaporated under reduced pressure at 80 °C to obtain phenolic resin-modified TiO 2 Powder, crushed for later use;

[0049] (3) TiO modified with the phenolic resin obtained in (2) 2 powder and the remaining 4 g TiO 2 After the powder is mixed evenly, it is mixed with 10 g of gel containing water, binder methylcellulose, and peptizing agent nitric acid, kneaded evenly on a kneader, and extruded. The obtained molding was cured at 120 °C for 10 h, and then fired at 700 °C for 4 h under a nitrogen atmosphere to obtain TiO 2 -C composite carrier with a compressive strength of 132 N / cm and a specific surface area...

Embodiment 2

[0055] Basically the same as Example 1, but with the following changes:

[0056] A solution containing palladium acetate and platinum tetrachloride was sprayed on TiO 2 -C composite support, make palladium acetate and platinum tetrachloride supported on TiO 2 - on the composite carrier of C, obtain the catalyst precursor;

[0057] The catalyst precursor was dried at 100 °C for 2 h, and then reduced with an aqueous solution of sodium formate at 60 °C for 2 h to obtain 0.1%Pd-1.0%Pt / TiO 2 -C noble metal catalyst, the mass ratio between Pd and Pt is 0.1.

[0058] The catalyst obtained in this example was used in the hydrogenation process of 2,6-dicarboxyanthraquinone, and the conversion rate of 2,6-dicarboxyanthraquinone was 99.6%.

[0059]

Embodiment 3

[0061] Basically the same as Example 1, but with the following changes:

[0062] TiO 2 -C composite support is impregnated with a solution containing palladium nitrate and platinum nitrate, so that palladium nitrate and platinum nitrate are loaded on TiO 2 - on the composite carrier of C, obtain the catalyst precursor;

[0063] The catalyst precursor was dried at 100 °C for 2 h, and then reduced with an aqueous solution of sodium formate at 60 °C for 2 h to obtain 1.0%Pd-0.1%Pt / TiO 2 -C noble metal catalyst, the mass ratio between Pd and Pt is 10.

[0064] The catalyst obtained in this example was used in the hydrogenation process of 2,6-dicarboxyanthraquinone, and the conversion rate of 2,6-dicarboxyanthraquinone was 99.7%.

[0065]

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Abstract

The invention discloses a noble metal / TiO2-C catalyst for removing p-carboxybenzaldehyde, 2,6-dicarboxyl anthraquinone, 2,6-dicarboxyl fluorenone, and other colored impurities from crude p-phthalic acid. The noble metal / TiO2-C catalyst of the present invention can be used for the hydrogenation refinement process of the crude p-phthalic acid. With the noble metal / TiO2-C catalyst of the present invention, the contents of the p-carboxybenzaldehyde, the 2,6-dicarboxyl anthraquinone, the 2,6-dicarboxyl fluorenone, and other colored impurities can be significantly reduced.

Description

technical field [0001] The present invention relates to a noble metal / TiO for hydrogenation reaction 2 -C Catalyst and its preparation method, especially related to noble metal / TiO used for removing colored impurities such as p-carboxybenzaldehyde, 2,6-dicarboxyanthraquinone, 2,6-dicarboxyfluorenone, etc. in crude terephthalic acid 2 -C catalyst and preparation method. Background technique [0002] Purified terephthalic acid (PTA) is a very important organic chemical raw material, and its downstream processing products are mainly polyester fibers, polyester films, packaging bottles and PET engineering plastics. In the crude terephthalic acid (CTA) produced by the liquid-phase oxidation of p-xylene (PX), it generally contains 2000-3000 μg / g p-carboxybenzaldehyde (4-CBA) and a small amount of 2,6-dicarboxylate Anthraquinone, 2,6-dicarboxyfluorenone and other polycyclic aromatic colored impurities are more harmful, not only affecting the melting point of polyester, but also a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46B01J23/44B01J23/42B01J21/18B01J35/10C07C63/26C07C51/487
Inventor 堵文斌王继元曾崇余卞伯同许建文陈韶辉柏基业朱庆奋庞焱
Owner CHINA PETROLEUM & CHEM CORP
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