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Platinum-carbon catalyst and preparation method thereof

A platinum-carbon catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, sulfonic acid preparation, etc., can solve the problems of blockage of pores and active sites, easy agglomeration of active components, poor selectivity, etc., and achieve improvement. Hydroxyl content, not easy to agglomerate, and the effect of improving activity and selectivity

Active Publication Date: 2019-12-06
SHENYANG RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of the above catalysts that the active components are easy to agglomerate, the pores and active sites are blocked, resulting in reduced activity and poor selectivity, the present invention provides an effective platinum-carbon catalyst and its preparation method, especially in sulfur-containing halogenated aromatic nitrates. Application in the selective hydrogenation reaction of base compounds and other polynitroaromatic compounds

Method used

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  • Platinum-carbon catalyst and preparation method thereof
  • Platinum-carbon catalyst and preparation method thereof
  • Platinum-carbon catalyst and preparation method thereof

Examples

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Embodiment 1

[0032] Select the superfine carbon black (commercially available) of particle size at 20nm, and total specific surface area is 367m 2 / g, total pore volume 0.785cm 3 / g, more than 4nm pore volume is 0.656cm 3 / g, the specific surface area is 262m 2 / g, less than 4nm pore volume is 0.129cm 3 / g, the specific surface area is 105m 2 / g, the mesopore diameter is 5-15nm, named Z-0.

[0033] Modification treatment of ultra-fine carbon black: put ultra-fine carbon black Z-0 into a high-temperature steam treatment furnace, feed nitrogen gas at a flow rate of 100ml / min, and after the temperature rises to 300°C, turn off the nitrogen gas and turn on the water inlet pump. The water inflow is 1.0g / min. After passing through the preheater, the water is vaporized into water vapor and enters the furnace. The ultra-fine carbon black is treated at 500°C and 0.07Mpa for 4 hours. After the treatment, stop the water inflow, switch to nitrogen, and cool down to room temperature , to obtain mo...

Embodiment 2

[0035] The difference from Example 1 is that when the superfine carbon black is modified, the treatment pressure in the high temperature steam treatment furnace is 0.2Mpa, and other conditions are the same as in Example 1, and the modified superfine carbon black is named as Z- 2 (see Table 1).

Embodiment 3

[0037] The difference from Example 1 is that during the modification treatment of ultrafine carbon black, the treatment pressure in the high-temperature steam treatment furnace is 0.05Mpa, the treatment temperature is 550°C, and other conditions are the same as in Example 1 to obtain modified ultrafine carbon Black was designated Z-3 (see Table 1).

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Abstract

The invention belongs to the technical field of noble metal catalysts, in particular to a platinum-carbon catalyst with high activity and high selectivity, a preparation method thereof and its application in selective hydrogenation reaction of sulfur-containing halogenated aromatic nitro compounds or other polynitro aromatic compounds. The catalyst is modified ultra-fine carbon black carrier supported with noble metal platinum; wherein the carrying capacity of precious metals is 1-10 percent. As that ultrafine carbon black is used as the carrier and the ultrafine carbon black is modified, theactive metal and the carrier for preparing the catalyst are dispersed in a 'mutual mosaic' manner to prevent the agglomeration of metal particles in the reaction process. The developed mesoporous porestructure is conducive to the diffusion of reaction molecules, prevents the aggregation of organic macromolecules such as reaction intermediate states from covering the active site of the catalyst and blocking the pore channels, and the prepared catalyst has high activity and long service life.

Description

Technical field: [0001] The invention belongs to the technical field of noble metal catalysts, in particular to a highly active and highly selective platinum carbon catalyst and its preparation method and its selective addition of sulfur-containing halogenated aromatic nitro compounds or other polynitroaromatic compounds. Applications in hydrogen reactions. Background technique: [0002] In the application of traditional platinum-carbon catalysts in the hydrogenation of nitro compounds, there are problems such as easy aggregation of active components and easy aggregation of reaction intermediate macromolecules to block the pores and active sites of the carrier, resulting in reduced catalyst activity and poor selectivity. Aromatic nitro compounds and other polynitroaromatic compounds are more likely to produce a large number of by-products due to catalyst sintering and carbon deposition in the selective hydrogenation reaction, which seriously reduces catalyst activity, select...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J21/18B01J35/10C07C303/22C07C309/48C07C309/46
CPCB01J23/42B01J21/18C07C303/22B01J35/615B01J35/635C07C309/48C07C309/46
Inventor 鄢冬茂明卫星龚党生胥维昌刘嵩
Owner SHENYANG RES INST OF CHEM IND