Ce-doped LaMnO3 catalyst and preparation method thereof

A catalyst and element doping technology, used in catalyst activation/preparation, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., to improve redox capacity and electron transfer rate, and excellent VOCS removal high performance, low price

Inactive Publication Date: 2019-07-12
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unfortunately, during the application and later stages of these synthetic materials, toluene is inevitably released into the atmosphe

Method used

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  • Ce-doped LaMnO3 catalyst and preparation method thereof
  • Ce-doped LaMnO3 catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Step (1): Weigh about 2.4509 g of manganese acetate, 4.2028 g of citric acid, 2.4369 g of lanthanum nitrate, 6 g of polyethylene glycol, and 1.0856 g of cerium nitrate into a beaker, dissolve in ethanol, and stir for 1 hour with a magnetic stirrer .

[0017] Step (2): The product obtained in step (1) was dried in a constant temperature water bath at 70°C until it became gelatinous. The resulting gel was placed in a crucible and baked in a muffle furnace at 700°C for 7 hours.

[0018] Step (3): Doping Ce obtained in step (2) (La 0.75 Ce 0.25 MnO 3 ) Grind and sieve 40-60 mesh for later use.

Embodiment 2

[0020] Step (1): Weigh about 2.4509 g of manganese acetate, 4.2028 g of citric acid, 3.2492 g of lanthanum nitrate, and 6 g of polyethylene glycol, add them into a beaker, dissolve them in ethanol, and stir for 1 hour with a magnetic stirrer.

[0021] Step (2): The product obtained in step (1) was dried in a constant temperature water bath at 70°C until it became gelatinous, and the obtained gel was placed in a crucible and baked in a muffle furnace at 700°C for 7 hours.

[0022] Step (3): LaMnO obtained in step (2) 3 Grind and sieve 40-60 mesh for later use.

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Abstract

The invention belongs to the field of VOC degradation, and particularly relates to a Z-type La1-xCexMnO3 catalyst used for photothermal degradation of toluene. According to the Ce-doped LaMnO3 catalyst and a preparation method thereof, a series of Ce-doped LaMnO3(La1-xCexMnO3) is prepared by adopting a sol-gel method and is subjected to gaseous toluene oxidation test in order to study the effect of Ce doping in LaMnO3 on the activity of LaMnO3 under photothermal conditions. The Ce-doped LaMnO3 can form the coexistence of the La1-xCexMnO3 and CeO2, the reaction of CeO2/La1-xCexMnO3 under the photothermal condition follows the Mars-van Krevelen redox cycle mechanism, the prepared CeO2/La1-xCexMnO3 can form an efficient Z-Scheme heterojunction, and the electron transfer speed of the catalystin a high-temperature region can be improved. Moreover, in photothermal catalytic degradation, lattice oxygen is the most important active substance, and the lattice oxygen content of perovskite and the reaction activity can be increased by doping a small amount of cerium doping. The optical and thermal activity are enhanced by the Ce doped LaMnO3 perovskite and the Ce-doped LaMnO3 catalyst is a promising catalyst.

Description

technical field [0001] The invention belongs to the field of catalytic degradation of volatile organic compounds, in particular to a direct z-type heterojunction catalyst for photothermal degradation of toluene. Background technique [0002] Volatile organic compounds (VOCs) are organic gases with high vapor pressure and low water solubility. VOCs are considered to be one of the main causes of air pollution since they may be precursors to the formation of ozone and photochemical smog. Among the most common and toxic non-halogenated compounds, formaldehyde, benzene, carbon monoxide, toluene, propylene, phenol, acetone and styrene are of concern. Among them, toluene, which is used in large quantities as a solvent, and high-octane gasoline additives are important raw materials for organic chemicals. A series of intermediates derived from toluene are widely used in the production of fine chemicals such as dyes, drugs, pesticides, explosives, auxiliaries, spices, etc., and are ...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J37/08B01D53/86B01D53/44
CPCB01D53/8687B01D2257/708B01J23/34B01J35/004B01J37/0036B01J37/082
Inventor 罗士平周婷谢爱娟唐毅然金响顾鹏飞吴嘉奕姚超李霞章
Owner CHANGZHOU UNIV
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