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Transition metal-containing catalysts and catalyst combinations including transition metal-containing catalysts and processes for their preparation and use as oxidation catalysts

A transition metal and catalyst technology, applied in the field of catalyst compositions, can solve the problems of difficult to design catalysts, difficult to recover precious metals for reuse, etc.

Inactive Publication Date: 2009-11-18
MONSANTO TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this approach has several disadvantages: (1) it is difficult to recover expensive precious metals from the aluminosilicate support for reuse; (2) it is difficult to design the two catalysts so that the ratio between them is matched. and (3) the carbon support does not contain noble metals deposited on its surface and tends to deactivate at rates exceeding 10% / per cycle

Method used

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  • Transition metal-containing catalysts and catalyst combinations including transition metal-containing catalysts and processes for their preparation and use as oxidation catalysts
  • Transition metal-containing catalysts and catalyst combinations including transition metal-containing catalysts and processes for their preparation and use as oxidation catalysts
  • Transition metal-containing catalysts and catalyst combinations including transition metal-containing catalysts and processes for their preparation and use as oxidation catalysts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0412] This example describes in detail the preparation method for preparing carbon-supported molybdenum carbide and nitride precursors.

[0413] Will have 1067m 2 A carbon support (20.0 g) (obtained from Degussa Corp.) with a BET surface area of ​​ / g was added to a 1 L beaker containing deionized water (300 mL) and a magnetic stir bar to form a carbon support slurry.

[0414] Use manufactured by Cole-Parmer Instrument Company (Vernon Hills, IL) Metering pumps Ammonium molybdate ((NH 4 ) 2 MoO 4 ) (4.236 g) (Aldrich Chemical Co., Milwaukee, WI) a solution (60 ml) in deionized water was added to the carbon support slurry at a rate of 2.0 ml / min in about 30-40 minutes. The carbon support slurry is stirred by a mechanical stirrer, and at the same time the molybdenum solution is added to the carbon support slurry. During the addition of the molybdenum solution to the carbon slurry, the pH of the resulting mixture was maintained at about 4.0 by the co-addition of dilute nitric acid (...

Embodiment 2

[0418] This example describes in detail a method for preparing a carbon-supported molybdenum carbide catalyst using the catalyst precursor prepared as described in Example 1.

[0419] The precursor (8.0 g) was added to a Hastelloy C (Hastelloy C) tubular reactor filled with a high-temperature insulating material. The reactor is used for about 100cm 3 The argon gas introduced into the reactor at a flow rate per minute is purged at about 20°C for about 15 minutes. A thermocouple was inserted into the center of the reactor for the precursor material feed.

[0420] After the precursor was introduced into the reactor, the temperature of the reactor atmosphere was increased to about 300°C over 30 minutes, during which time a 50% / 50% (v / v) mixture of methane and hydrogen (Airgas Co., St.Louis, MO) with about 100cm 3 It is introduced into the reactor at a rate of per minute.

[0421] The temperature of the reactor atmosphere is then increased to about 650°C at a rate of about 2°C / minute. ...

Embodiment 3

[0424] This example illustrates in detail the method of preparing a carbon-supported molybdenum nitride catalyst using the catalyst precursor prepared as described in Example 1.

[0425] The precursor (10.0 g) was added to the Hastelloy C tube reactor filled with high-temperature insulating material. The reactor is used for about 100cm 3 The argon gas introduced into the reactor at a flow rate per minute is purged at about 20°C for about 15 minutes. The thermocouple was inserted into the center of the reactor used to load the precursor.

[0426]The temperature of the reactor was then increased to about 300°C over 30 minutes, during which time the ammonia (Airgas Co., St. Louis, MO) was reduced to about 100 cm 3 It is introduced into the reactor at a rate of per minute.

[0427] After the precursor was introduced into the reactor, the temperature of the reactor atmosphere was increased to about 800°C at a rate of about 2°C / minute. The reactor atmosphere was maintained at a temperat...

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Abstract

The invention prepares a catalyst containing bon carrier, a combination containing Transition Metal carbide, nitrifier or carbides-nitrifier is formed on the bon carrier. The catalyst can be used for catalytic oxidation reaction, including preparing secondary amine from tertiary amine catalytic oxidation.

Description

Invention field [0001] The present invention relates to the field of heterogeneous catalysis, and more specifically to a catalyst comprising a carbon support. A composition is formed on or over the surface of the carbon support, and the composition contains nitrogen and nitrogen. / Or one or more transition metals combined with carbon. The present invention also relates to a catalyst comprising a carbon support, having a composition containing one or more primary transition metals on the carbon support, wherein the catalyst further contains additional (minor) metal elements. The secondary metal element may be introduced into a composition containing one or more primary transition metals, or the catalyst may contain a secondary catalytic composition containing a carbon support and / or primary transition metal. A minor metal element on or on the surface of the composition. The present invention also relates to a catalyst composition comprising: a carbon support-containing catalyst ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J27/22B01J23/75B01J21/18B01J37/08C07F9/38C07C209/68
Inventor J·P·阿兰塞特F·刘
Owner MONSANTO TECH LLC
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