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Method for promoting synthesis and regeneration of bimetallic catalyst by using coordination effect of chlorine

A technology of bimetallic catalysts and synthesis methods, applied in the direction of catalyst regeneration/reactivation, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc. Active site embedding and other issues, to achieve the effect of reducing application cost, good catalytic oxidation purification effect, and simple synthesis steps

Pending Publication Date: 2022-02-22
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the oxidation reaction of alkane VOCs is usually carried out at a temperature above 200 ° C, metal Ru and Ag are easily oxidized at this temperature, resulting in a decrease in their catalytic activity.
At the same time, the instantaneous high temperature during the VOCs oxidation process and the high content of water vapor in the exhaust gas can easily cause the surface reconstruction of the material, resulting in the embedding of the metal active sites, thereby reducing the efficiency of the catalyst.

Method used

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  • Method for promoting synthesis and regeneration of bimetallic catalyst by using coordination effect of chlorine
  • Method for promoting synthesis and regeneration of bimetallic catalyst by using coordination effect of chlorine
  • Method for promoting synthesis and regeneration of bimetallic catalyst by using coordination effect of chlorine

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Synthetic load type single metal Ru catalyst: RUCL with 24 ml concentration of 1.25 mg (Ru) / ml 3 Aqueous solution was added in a 50 ml beaker, add 3G TiO 2 (P25) Powder, stirred rapidly for 1 h, so that the solution and the carrier are fully contacted. The solution was transferred to the heating plate, controlled the heating temperature of 80 ° C, stirring and evaporated, placed in a 100 ° C oven further dried. The resulting dark green powder was filled in the quartz tube, and the H is accessed at a gas flow rate of 50 sccm. 2 The gas is reduced, the temperature is set to 450 ° C, the time is set to 2 h, that is, a single metal Ru catalyst can be obtained, and the metal load is 1%, which is remembected as RU 1 / P25.

[0051] RUCL 3 Pre-drive solution is analyzed by UV-VIS, its analysis results figure 1 Indicated.

[0052] Take 66mg RU 1 The / p25 is placed in a quartz reaction tube, which is introduced into the reaction air containing 1% propane, and the temperature of t...

Embodiment 2

[0054] Synthetic load type single metal AG catalyst: AGNO with 24 ml concentration of 1.33 mg (Ag) / ml 3 Aqueous solution was added in a 50 ml beaker, add 3G TiO 2 (P25) Powder, stirred rapidly for 1 h, so that the solution and the carrier are fully contacted. The solution was transferred to the heating plate, controlled the heating temperature of 80 ° C, stirring and evaporated, placed in a 100 ° C oven further dried. Transfer the resulting dark green powder to the quartz tube, flows into H. 2 Restore, the temperature is set to 450 ° C, the time is set to 2 h, that is, a single metal Ru catalyst can be obtained, and the metal load is 1%, which is remembered as AG. 1 / P25.

[0055] Agno 3 Pre-drive solution is analyzed by UV-VIS, its analysis results figure 1 Indicated.

[0056] Take 66mg AG 1 The / p25 is placed in a quartz reaction tube, which is introduced into the reaction air containing 1% propane, and the temperature of the reaction is controlled at 60000 ml / (g H), and t...

Embodiment 3

[0058] Synthetic load type Ru-Ag bimetallic catalyst: put RUCL 3 Agno 3 The solution was mixed according to a certain volume, respectively, according to 21.6 + 2.4 mL, 16.8 + 7.2 mL, 12 + 12 ml of RUCL of the concentration of 1.25 mg (ru) / ml. 3 Aqueous solution and 1.33 mg (Ag) / ml AGNO 3 The aqueous solution was mixed in a 50 ml beaker, add 3 g of TiO 2 (P25) Powder, stirred rapidly for 1 h, so that the solution and the carrier are fully contacted. The solution was transferred to the heating plate, controlled the heating temperature of 80 ° C, stirring and evaporated, placed in a 100 ° C oven further dried. Transfer the resulting dark green powder to the quartz tube, flows into H. 2 Restore, the temperature is set to 450 ° C, the time is set to 2 h, that is, the Ru-Ag bimetallic catalyst can be obtained, and the total metal total load is 1%, according to the difference between the Ru and Ag ratios, respectively. 0.9 AG 0.1 / P25, RU 0.7 AG 0.3 / P25 and ru 0.5 AG 0.5 / P25.

...

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Abstract

The invention discloses a method for promoting synthesis and regeneration of a bimetallic catalyst by utilizing a coordination effect of chlorine. Interaction among different noble metal ions is enhanced by utilizing the coordination effect of chlorine to form a bimetallic alloy, and the catalytic oxidation activity of the catalyst is improved by virtue of the synergistic effect of two noble metal ions; and meanwhile, the coordination effect of chlorine can be utilized to re-expose the active noble metal component which is subjected to high-temperature thermal reconstruction embedding, so that the catalytic oxidation activity of the catalyst material is partially recovered, the recycling of the noble metal catalyst material is facilitated, and the application cost of the catalyst material is reduced. The bimetallic catalyst prepared by the method disclosed by the invention can obviously improve the catalytic oxidation degradation activity on VOCs (Volatile Organic Compounds) such as propane, chlorobenzene and the like, and is beneficial to reducing the dependence on rare noble metal catalysts such as Pt, Pd, Rh and the like, so that the use cost of a purification material is reduced.

Description

Technical field [0001] The present invention relates to a method of synthesizing and regenerating, and more particularly to a coordination effect using chlorine, a method of synthesizing a bimetallic catalyst, the method of the present invention can be used to prepare high activity and tolerance catalytic oxidation Material. Background technique [0002] The catalytic oxidation method is one of the effective means of controlling the pollution of volatile organic matter (VOCs), which has the advantages of low energy consumption and small secondary pollution, and its technical core is the use of high efficiency catalysts. Depending on the catalyst active ingredient, it can be divided into molecular sieves, precious metals and non-precious metal catalysts. Compared to molecular sieves and non-metal catalysts, noble metal catalysts are more advantageous in terms of activity and stability, so the commercially available catalyst is mainly precious. Especially for the catalytic oxidatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46B01J23/50B01J23/96B01J35/00B01J37/04B01J37/18B01J38/60B01D53/86B01D53/72
CPCB01J37/0018B01J37/18B01J23/462B01J23/50B01J23/96B01J38/60B01D53/8687B01D2257/708B01J35/391B01J35/396
Inventor 贾宏鹏陈金
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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