Cerium oxide/HZSM-5 molecular sieve composite catalytic material, preparation method, and application thereof in decomposing carbon tetrafluoride

A catalytic material, carbon tetrafluoride technology, applied in molecular sieve catalysts, separation methods, chemical instruments and methods, etc., can solve problems such as low activity and poor stability, and achieve high catalytic activity, stable catalytic performance, and preparation process. simple effect

Active Publication Date: 2020-02-21
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the defects in the prior art, the purpose of the present invention is to provide a cerium oxide / HZSM-5 molecular sieve composite catalytic material composed of cerium oxide loaded on the HZSM-5 molecular sieve, which can be used at a relatively low temperature. It can realize the efficient catalytic conversion of carbon tetrafluoride in flue gas into carbon dioxide, and solve the technical problems of low activity and poor stability of traditional carbon tetrafluoride decomposition catalysts at lower temperatures

Method used

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  • Cerium oxide/HZSM-5 molecular sieve composite catalytic material, preparation method, and application thereof in decomposing carbon tetrafluoride
  • Cerium oxide/HZSM-5 molecular sieve composite catalytic material, preparation method, and application thereof in decomposing carbon tetrafluoride
  • Cerium oxide/HZSM-5 molecular sieve composite catalytic material, preparation method, and application thereof in decomposing carbon tetrafluoride

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Experimental program
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Effect test

Embodiment 1

[0051] Analytical pure cerium nitrate (Ce(NO 3 ) 3 ·6H 2 O) added to deionized water to make Ce 3+ A colorless solution with a concentration of 0.015 to 0.15 mol / L, the resulting solution is denoted as A; the HZSM-5 molecular sieve (Si / Al=18) was heated to 550°C at a heating rate of 2°C / min and kept for 5 hours to remove the commercial HZSM- 5 The template agent remaining in the molecular sieve was used to obtain solid A; 3 g of solid A was added to 30 mL of solution A, stirred at 500 rpm / min for 3 h, and the solution obtained by ultrasonic treatment for 3 h was recorded as B; the solution B was left to stand for 12 h, and placed in an oven at 80 ° C Dry to obtain sample C; place sample C in a tube furnace at 700°C, and roast it under a nitrogen atmosphere for 4 hours, with a heating rate of 5°C / min; after roasting, it is naturally cooled to room temperature under a nitrogen atmosphere, and taken out from the roasting tube. Obtain white cerium oxide / HZSM-5 molecular sieve c...

Embodiment 2

[0053] The commercial HZSM-5 molecular sieve (Si / Al=18) was heated to 550°C at a heating rate of 2°C / min and kept for 5 hours to remove the template agent remaining in the commercial HZSM-5 molecular sieve to obtain a solid HZSM-5 molecular sieve. The experiment was carried out in a fixed-bed reactor, the filling capacity of HZSM-5 molecular sieve was 1g, and nitrogen was used as CF 4 Carrier gas, control its flow rate to 2.5mL / min (10000ppm), another path of nitrogen as a balance gas to control its flow rate to 30ml / min (60vol%), and the flow rate of water vapor after vaporization to 17.5ml / min (35vol%), Keep the total gas flow rate at 50mL / min, and the experimental temperature at 550°C. After flue gas treatment, the catalyst treatment efficiency was recorded after the concentration of carbon tetrafluoride reached a stable level. The result is as figure 2 shown, from figure 2 It can be seen that the use of a single HZSM-5 molecular sieve for CF 4 The catalytic conversio...

Embodiment 3

[0055] Analytical pure cobalt nitrate (Ce(NO 3 ) 3 ·6H 2 O) Put it into a crucible and place it in a tube furnace for roasting at 650-750° C. to obtain pure cerium oxide solid. The experiment was carried out in a fixed-bed reactor with a filling capacity of 1 g of pure cerium oxide, and nitrogen was used as CF 4 Carrier gas, control its flow rate to 2.5mL / min (10000ppm), another path of nitrogen is used as a balance gas to control its flow rate to 30ml / min (60vol%), and the flow rate of water vapor after vaporization is 17.5ml / min (35vol%), Keep the total gas flow rate at 50mL / min, and the experimental temperature at 550°C. After flue gas treatment, the catalyst treatment efficiency was recorded after the concentration of carbon tetrafluoride reached a stable level. The result is as image 3 shown, from image 3 It can be seen that using a single cerium oxide for CF 4 The catalytic conversion rate is only about 7%.

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Abstract

The invention discloses a cerium oxide/HZSM-5 molecular sieve composite catalytic material, a preparation method, and application thereof in catalytic decomposition of carbon tetrafluoride. The composite catalytic material is formed by loading cerium oxide on HZSM-5 molecular sieve, the catalyst can achieve efficient catalytic conversion of carbon tetrafluoride into carbon dioxide under mild conditions, and the defects that a traditional carbon tetrafluoride decomposition catalyst is prone to inactivation at a relatively high temperature and low in low-temperature activity are avoided.

Description

technical field [0001] The present invention relates to a composite catalytic material, in particular to a cerium oxide / HZSM-5 molecular sieve composite catalytic material and a preparation method thereof, and also to the application of the cerium oxide / HZSM-5 molecular sieve composite catalytic material as a carbon tetrafluoride decomposition catalyst, It belongs to the field of catalytic technology. Background technique [0002] Carbon tetrafluoride is a kind of low-carbon hydrocarbon in which hydrogen atoms are completely replaced by fluorine atoms. Carbon tetrafluoride has the advantages of stability, safety, non-spontaneous combustion, low toxicity, and is not easy to cause chemical reactions at room temperature. The stability of carbon tetrafluoride It is mainly reflected in two aspects, one is the high symmetry of its structure, and the other is that the bond energy of C-F bond is extremely strong and has strong infrared light absorption ability and thermal stability....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01D53/86B01D53/70
CPCB01D53/8662B01D2257/2066B01D2258/0283B01J29/405B01J2229/18
Inventor 刘恢陈世杰沈峰华廖祖武郑谐刘操刘雨程向开松李青竹王海鹰杨志辉
Owner CENT SOUTH UNIV
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