Co/hydroxyapatite catalyst as well as preparation method and application thereof

A hydroxyapatite and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problem of low utilization rate of active components, easy sintering of composite oxide catalysts at high temperature, and bulk active components Insufficient utilization of fractions and other problems, to achieve good application prospects, promote stability, easy to industrialize the effect of production

Inactive Publication Date: 2019-03-12
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to N 2 O is directly catalyzed and decomposed into a gas-solid two-phase reaction. The catalytic process often occurs on the surface of the catalyst or at the phase interface, and a large number of active components in the bulk phase cannot be fully utilized.
Therefore, composite oxide catalysts also have the disadvantage of low utilization of active components
In addition, when specifically applied to nitric acid tail gas, N 2 When O is catalytically decomposed (the reaction temperature is about 800 °C), the composite oxide catalyst still faces the problem of high temperature and easy sintering

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 7.92 g (NH 4 ) 2 HPO 4 and 23.62 g Ca(NO 3 ) 2 4H 2 O was dissolved in 200 mL of distilled water, and after continuing to stir evenly, ammonia water was added to adjust the pH to 9, then filtered and dried at 85 °C for 12 h, and then calcined at 750 °C for 3 h in an air atmosphere to obtain the carrier. 2 g of Co(NO 3 ) 2 ·6H 2 O dissolved in 500 mL of PBS dispersant solution (composed of H 2 O 500 mL, NaNO 3 4.00g, KNO 3 0.10 g, Na 2 HPO 4 1.75 g, KH 2 PO 4 0.10 g), ultrasonic treatment (power 500 W, time 30 min) and adding 5 g of carrier powder, stirring at room temperature for 24 h, filtering and drying at 85 °C for 12 h, and then calcining at 750 °C for 3 h in an air atmosphere to obtain the finished catalyst. The Ca / P molar ratio of the obtained catalyst was 1.67, and the mass percent content of cobalt as an active component was 2.3%.

[0027] Take 300 mg of the above catalyst, put it into a quartz reaction tube with an inner diameter of 8 mm...

Embodiment 2

[0029] In Example 1 (NH 4 ) 2 HPO 4 The mass was changed to 9.25 g, and the Co / hydroxyapatite catalyst was prepared by the same method, and the Ca / P molar ratio in the catalyst was 1.43.

[0030] Adopt embodiment 1 evaluation condition, under above-mentioned evaluation condition, reaction temperature is in the scope of 640~860 ℃, carries out a sampling test every 20 ℃, draws: N 2 O conversion can reach 100%. It shows that the catalyst prepared by the invention has high catalytic activity and good thermal stability.

Embodiment 3

[0032] The ammonia water in Example 1 was adjusted to pH=9.5, and the Co / hydroxyapatite catalyst was prepared by the same method.

[0033] Adopt embodiment 1 evaluation condition, under above-mentioned evaluation condition, reaction temperature is in the scope of 620~840 ℃, every interval 20 ℃ carries out a sampling inspection, draws: N 2 O conversion can reach 100%. It shows that the catalyst prepared by the invention has high catalytic activity and good thermal stability.

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PUM

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Abstract

The invention discloses a Co/hydroxyapatite catalyst as well as a preparation method and application thereof. The catalyst takes hydroxyapatite as a carrier and cobalt as an active component, whereinthe mole ratio of Ca to P is 1.35-1.67, and cobalt accounts for 0.5-2.6% of the total mass of the catalyst. (NH4)2HPO4 serves as a phosphorus source, Ca(NO3)2.4H2O serves as a calcium source, ammoniumhydroxide is added to condition the pH value of the system after the phosphorus source and the calcium source are dissolved and mixed uniformly, the mixture is treated with operations such as filtration, drying and calcination, and the carrier is prepared; and cobalt salt is dissolved in a PBS (phosphate buffer saline) dispersant solution and subjected to ultrasonic treatment, then the carrier powder is added, ion exchange is conducted at the room temperature, the product is treated with steps such as filtration, drying and calcination, and the catalyst is prepared. The preparation technologyof the catalyst is simple, the raw materials sources are wide, the cost is low, and the catalyst is harmless to the human body and the environment. The catalyst can catalyze and decompose N2O withina wide temperature range, and has the excellent oxygen resistant, waterproof and NO resistant properties.

Description

technical field [0001] The invention relates to a Co / hydroxyapatite catalyst, a preparation method and application thereof, and belongs to the technical field of catalyst preparation. Background technique [0002] N 2 O was long considered to be a gas that is harmless to the environment and has been widely used in medical and industrial fields. In recent years, with people's interest in N 2 With the continuous deepening of O's understanding and research, its environmental hazards have been recognized. N 2 O is not only a strong ozone depleter, but also a major greenhouse gas with a global warming potential (GWP) of CO 2 310 times and CH 4 21 times. In addition, N 2 O is chemically stable and has a lifetime of about 150 years in the atmosphere. Therefore, N 2 The emission control and elimination of O has become an important issue that countries must face, and the research and development of its related technologies have also attracted more and more attention from res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185B01D53/56B01D53/86
CPCB01D53/8628B01D2257/402B01J27/1853Y02C20/10
Inventor 王永钊魏旭晖赵永祥李潇
Owner SHANXI UNIV
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