Core-shell CO oxidation catalyst as well as preparation method and application thereof

An oxidation catalyst, core-shell type technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the complex preparation process, high production cost, Less storage capacity and other issues, to achieve the effects of avoiding catalyst deactivation, prolonging service life, and low preparation cost

Active Publication Date: 2019-05-17
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a core-shell CO oxidation catalyst and its preparation method and application. The present invention first prepares the core-shell MOF@MOF precursor material, that is, a series of MOF materials are coated in another MOF material, Form the MOF@MOF core-shell material, and then obtain a high-efficiency CO oxidation catalyst that maintains the core-shell structure by calcining it. This method can solve the shortcomings of noble metal catalysts such as complex preparation process, high production cost, small storage capacity, and difficult recovery. , and the two MOF materials were combined together to preform the MOF@MOF precursor material, which maintained the core-shell structure after calcination, the inner MOF was transformed into metal oxide particles, and the outer ZIF-67 was transformed into Co 3 o 4 , but still maintain the dodecahedral shape of ZIF-67

Method used

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  • Core-shell CO oxidation catalyst as well as preparation method and application thereof
  • Core-shell CO oxidation catalyst as well as preparation method and application thereof
  • Core-shell CO oxidation catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Preparation of core-shell catalyst derived from MnBDC@ZiF-67

[0040] First, dissolve 0.6125g of manganese acetate tetrahydrate and 0.4150g of terephthalic acid in 25mL of N,N-dimethylformamide, mix them uniformly by ultrasonic, and record it as solution A; then mix 1.4550g of cobalt nitrate hexahydrate with 1.6460g 2-Methylimidazole was dissolved in 40 mL of methanol respectively, and mixed evenly after complete dissolution, which was recorded as solution B; the mixed solutions A and B were ultrasonically stirred, and placed in an autoclave at 150 °C for 5 h. After centrifugal washing with DMF for 2-3 times, washing with methanol until the supernatant was colorless, and drying at 80°C, the MnBDC@ZiF-67 core-shell material was obtained, which was purple in color. Then calcined at 350° C. for 2 h in a muffle furnace to obtain the final catalyst, which was black in color.

[0041] The CO catalytic test analysis was carried out on the core-shell catalyst derive...

Embodiment 2

[0044] Example 2: Preparation of core-shell catalyst derived from FeBTC (hydrothermal)@ZiF-67

[0045] First, dissolve 0.4000g of FeBTC (hydrothermal) in 40mL of ethanol, mix it uniformly by ultrasonic, and record it as solution A; then dissolve 1.4550g of cobalt nitrate hexahydrate and 1.6420g of 2-methylimidazole in 40mL of methanol, and completely dissolve After mixing evenly, record it as solution B; mix A and B solutions, and stir at room temperature for 24 hours. After centrifugation and washing with ethanol, the supernatant was washed with methanol until it was colorless, and dried at 80° C. to obtain an uncalcined product with a purple color. Then calcined at 350° C. for 2 h in a muffle furnace to obtain the final catalyst, which was black in color.

[0046] The CO catalytic test analysis was carried out on the core-shell catalyst derived from FeBTC (hydrothermal)@ZiF-67, and CO was completely oxidized at 110 °C.

Embodiment 3

[0047] Example 3: Preparation of core-shell catalyst derived from CuBTC (nitrate, 100°C, hydrothermal)@ZiF-67

[0048] First, dissolve 0.4000g CuBTC (nitrate, 100°C, hydrothermal) in 40mL of ethanol, mix it uniformly by ultrasonic, and record it as solution A; then dissolve 1.4550g of cobalt nitrate hexahydrate and 1.6420g of 2-methylimidazole in 40mL In methanol, completely dissolved and mixed evenly, recorded as solution B; mix A and B solutions, and stir at room temperature for 24 hours. After centrifugation and washing with ethanol, the supernatant was washed with methanol until it was colorless, and dried at 80° C. to obtain an uncalcined product with a purple color. Then it was calcined at 350°C for 2 h in a muffle furnace to obtain the final catalyst, which was black in color.

[0049] The CO catalytic test analysis was carried out on the core-shell catalyst derived from CuBTC (nitrate, 100 °C, hydrothermal) @ZiF-67, and CO was completely oxidized at 110 °C. Scanning ...

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Abstract

The invention provides a core-shell CO oxidation catalyst as well as a preparation method and an application thereof. A core-shell MOF@MOF precursor material is prepared firstly, that is, a series ofMOF materials are coated with another MOF material, a core-shell MOF@MOF material is formed and calcined, and an efficient CO oxidation catalyst keeping a core-shell structure is obtained. Through theadoption of the method, the defects of complicated preparation process, high production cost, small reserve, difficult recovery and the like of a noble metal catalyst can be overcome, two kinds of MOF materials are combined to form the MOF@MOF precursor material in advance, the core-shell structure is kept after calcination, by means of the structure, inactivation of an internal metal oxide catalyst due to water vapor can be reduced to a great extent, internal and external metal oxides can have a synergetic catalysis effect on CO, and CO can be converted completely at about 90 DEG C.

Description

(1) Technical field [0001] The invention relates to a MOF@MOF-derived core-shell catalyst with easy-to-obtain raw materials, mild conditions and low cost and a simple preparation method thereof, and is used for efficient catalytic oxidation of CO, mainly for the purification treatment of motor vehicle exhaust emissions, and belongs to the environment The field of catalytic materials technology. (2) Background technology [0002] With the development of social economy and the continuous progress of the petrochemical industry, human demand for fossil energy is also increasing, resulting in increasing CO emissions. CO is a colorless, odorless, toxic gas, mainly caused by incomplete combustion of carbon-containing fuels, or produced by internal combustion engines under high-temperature and high-pressure combustion conditions, and is one of the main pollutants of air pollution. CO is highly toxic to the blood and nervous system. After being inhaled by the human body, it enters t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J23/889B01J35/02B01J37/08B01D53/86B01D53/62
CPCY02A50/20
Inventor 张国亮李畅毛静雯
Owner ZHEJIANG UNIV OF TECH
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