Metal utilization in supported, metal-containing catalysts

A catalyst, oxidation catalyst technology, applied in the field of guiding and/or controlling metal deposition to the surface of porous substrates, treating porous substrates to provide treated substrates, and preparing catalysts

Inactive Publication Date: 2011-05-25
MONSANTO TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these catalysts are effective in PMIDA oxidation and are generally resistant to noble metal leaching under PMIDA oxidation conditions, there are still opportunities for improvement

Method used

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  • Metal utilization in supported, metal-containing catalysts
  • Metal utilization in supported, metal-containing catalysts
  • Metal utilization in supported, metal-containing catalysts

Examples

Experimental program
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Effect test

preparation example Construction

[0142] The preparation of catalysts is described herein, thereby providing improvements in the use of metals in supported metal-containing catalysts. In general, various embodiments of the invention include controlling and / or directing metal deposition onto the surface of a porous substrate. Controlled or directed metal deposition can be employed to address one or more of the problems associated with the preparation of conventional supported metal-containing catalysts.

[0143] For example, one potential disadvantage associated with conventional platinum-on-carbon catalysts is that relatively small platinum-containing particles are prone to leaching during liquid-phase catalytic oxidation reactions compared to larger metal-containing particles. Excessive leaching of metal particles results in metal loss and manifests as inefficient metal utilization. Furthermore, in the case of PMIDA oxidation, it is believed that these relatively small platinum-containing crystallites contri...

Embodiment 1

[0360] Three carbon supports were treated to determine the potency of candidate pore-blocking compounds. Carrier A has a total Langmuir surface area of ​​approximately 1500 m 2 / g (including the total surface area of ​​micropores is about 1279m 2 / g and the total macropore surface area is about 231m 2 / g). Carrier B has a total Langmuir surface area of ​​approximately 2700 m 2 / g (including the total surface area of ​​micropores is about 1987m 2 / g and the total macropore surface area is about 723m 2 / g). Carrier C has a total Langmuir surface area of ​​about 1100 m 2 / g (including the total surface area of ​​micropores is about 876m 2 / g and the total macropore surface area is about 332m 2 / g).

[0361] The candidate pore-blocking compound is 1,4-cyclohexanedione, ethylene glycol, and the diketal product of a coupling reaction between 1,4-cyclohexanedione and ethylene glycol (that is, 1, 4-Cyclohexanedione bis(ethylene glycol ketal)).

[0362] A sample of support (...

Embodiment 2

[0371] Carbons A, B and C (30 g) described in Example 1 were contacted with a solution of 1,4-cyclohexanedione in ethylene glycol (6 g / 40 g) at about 25° C. for about 60 minutes to The carbons A, B and C are treated separately. In addition, the various carbons were treated by contacting a solution of 1,3-cyclohexanedione in ethylene glycol (1 g / 50 g) at about 25° C. for about 120 minutes. In addition, carbon C was treated by contacting a solution of 1,4-cyclohexanedione in 1,2-propanediol (1 g / 50 g) at about 25° C. for about 60 minutes. The results of the surface area analysis are shown in Table 2. As shown, various combinations of diketones and diols provide reduced micropore surface area and macropore surface area, and more specifically, provide preferably reduced micropore surface area.

[0372] Table 2

[0373] sample

[0374] Carbon C

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Abstract

Generally, the present invention relates to improvements in metal utilization in supported, metal-containing catalysts. For example, the present invention relates to methods for directing and/or controlling metal deposition onto surfaces of porous substrates. The present invention also relates to methods for preparing catalysts in which a first metal is deposited onto a support (e.g., a porous carbon support) to provide one or more regions of a first metal at the surface of the support, and a second metal is deposited at the surface of the one or more regions of the first metal. Generally, the electropositivity of the first metal (e.g., copper or iron) is greater than the electropositivity of the second metal (e.g., a noble metal such as platinum) and the second metal is deposited at the surface of the one or more regions of the first metal by displacement of the first metal. The present invention further relates to treated substrates, catalyst precursor structures and catalysts prepared by these methods. The invention further relates to use of catalysts prepared as detailed herein in catalytic oxidation reactions, such as oxidation of a substrate selected from the group consisting of N-(phosphonomethyl)iminodiacetic acid or a salt thereof, formaldehyde, and/or formic acid.

Description

technical field [0001] In general, the present invention relates to improvements in the use of metals in supported metal-containing catalysts. For example, the present invention relates to methods for directing and / or controlling the deposition of metal onto the surface of a porous substrate. More specifically, some embodiments of the invention relate to methods for treating a porous substrate (e.g., a porous carbon substrate or a porous metal substrate) to provide a treated substrate having one or more This can be exploited as a desired property for metal-containing catalysts (eg, reduced surface area, which facilitates the formation of pores with nominal diameters within a predetermined range). [0002] The present invention also relates to a method for preparing a catalyst, wherein a first metal is deposited on a support, such as a porous carbon support, thereby providing one or more regions of the first metal on the surface of the support, and a second metal Deposited on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/56C07F9/38B01J35/00B01J35/10B01J21/18B01J37/02B01J23/62B01J23/89
CPCB01J35/006B01J23/626C07F9/3813B01J23/56B01J37/08B01J23/8906B01J23/8926B01J37/0205B01J35/008B01J37/0203B01J35/0053B01J35/002B01J37/0018B01J21/18C07C227/02B01J23/8913B01J35/1023B01J37/0211B01J35/108
Inventor K-T·万
Owner MONSANTO TECH LLC
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