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A kind of regeneration method of normal temperature carbon monoxide catalytic oxidation deactivation catalyst

A technology for deactivating catalysts and carbon monoxide, which is applied in metal/metal oxide/metal hydroxide catalysts, catalyst regeneration/reactivation, physical/chemical process catalysts, etc. It can solve the problems of easy deactivation, poor stability of nano-Au catalysts high cost

Inactive Publication Date: 2015-10-28
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, Au catalyst is the most active catalyst for CO catalytic oxidation, but the stability of nano-Au catalyst is poor, it is easy to deactivate during use, and its high cost limits its large-scale application.
[0004] At present, there are few reports on the regeneration and recycling of the deactivated CO catalytic oxidation catalyst at room temperature. Therefore, the patent of the present invention has carried out in-depth research on the regeneration method and process of the deactivated catalyst, and achieved good results. In order to reduce CO The use cost of room temperature oxidation catalyst has laid a solid foundation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh a certain amount of Al 2 o 3 The deactivated modified palladium catalyst as the carrier was washed with deionized water, then dried at 120°C for 4 hours, then calcined at 550°C for 4 hours, cooled to room temperature and then transferred to the reduction reactor. A hydrogen-nitrogen mixture with a content of 20% was reduced at 350°C for 3 hours to obtain a regenerated catalyst.

[0016] The catalytic performance of the regenerated catalyst was evaluated according to the aforementioned evaluation conditions, and the conversion rate of the catalyst to carbon dioxide was 98.2%.

Embodiment 2

[0018] Weigh a certain amount of deactivated modified palladium catalyst with activated carbon as the carrier, wash it with deionized water, and then mix it with sodium borohydride (or potassium borohydride, hydrazine hydrate, formaldehyde, isopropanol) with a mass content of 15%. It was reduced in an aqueous solution for 2 hours, washed with deionized water to neutrality, calcined at 100° C. for 4 hours, and cooled to room temperature to obtain a regenerated catalyst.

[0019] The catalytic performance of the regenerated catalyst was evaluated according to the aforementioned evaluation conditions, and the conversion rate of the catalyst to carbon dioxide was 90.7%.

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PUM

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Abstract

The invention discloses a regeneration method of an inactivated catalyst for normal-temperature carbon monoxide catalytic oxidation. The regeneration method is characterized in that the regeneration method is to reduce palladium oxide into simple substance palladium; a regeneration process mainly comprises a dry-method reduction manner or a wet-method reduction manner; the dry-method reduction manner is adopted for the inactivated catalyst using aluminum oxide as a carrier, and comprises main steps of cleaning with deionized water, drying at 100-150 DEG C for 1-8 h, calcinating at 350-550 DEG C for 1-5 h, and reducing at 200-450 DEG C for 2-6 h by utilization of a hydrogen and nitrogen mixed gas having a hydrogen volume content of 10%-30%; and the wet-method reduction manner is adopted for the inactivated catalyst using active carbon as a carrier, and comprises main steps of cleaning with the deionized water, reducing at 25-50 DEG C for 2-10 h by utilization of a reductant; cleaning with the deionized water until neutrality, and drying at 80-150 DEG C for 2-6 h. A regenerated catalyst has a characteristic of completely recovered catalyst performances.

Description

technical field [0001] The invention relates to a method for regenerating a deactivated catalyst, in particular to a method for regenerating a deactivated catalyst by catalytic oxidation of carbon monoxide at normal temperature, which can be applied in the field of regeneration and recycling of deactivated catalysts. Background technique [0002] Carbon monoxide (CO) is one of the main air pollutants. At present, there are a lot of researches at home and abroad on the oxidation of CO to CO2 at room temperature. There are mainly two types of catalysts used: composite oxide catalysts and noble metal catalysts. For composite oxide catalysts, there are mainly CuO-based composite oxides, such as the commercialized Hopcalite (Cu-Mn) catalyst, but the catalyst is sensitive to water vapor and easily poisoned and deactivated. [0003] For noble metal catalysts, there are mainly catalysts such as Au and Pd / C (Wacker type). At present, Au catalysts have the highest CO catalytic oxidat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/96B01J38/00B01J38/10
Inventor 姚炜张豪杰董亚梅王婷何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH