Fe2O3/Al2O3/cordierite catalyst and preparation method thereof

A cordierite and catalyst technology, which is applied to catalyst materials and the fields of preparation and application thereof, can solve problems such as low activity, and achieve the effects of high denitration efficiency, low denitration cost and excellent catalytic activity.

Inactive Publication Date: 2015-12-16
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fe, Cu, V, Ce and other transition metal oxide catalysts are cheap and are often used to catalyze oxidation-reduction reactions. However, in the existing domestic and foreign literature reports, transition metal oxide catalysts catalyze hydrocarbons to reduce NO X (HC-SCR) activity is low

Method used

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  • Fe2O3/Al2O3/cordierite catalyst and preparation method thereof
  • Fe2O3/Al2O3/cordierite catalyst and preparation method thereof
  • Fe2O3/Al2O3/cordierite catalyst and preparation method thereof

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Embodiment 1

[0026] (1) Carrier pretreatment: put the honeycomb cordierite in 15% nitric acid solution, treat at room temperature for 24 hours, then wash with distilled water until pH = 7, and dry at 110° C. for more than 12 hours.

[0027] (2) Preparation of aluminum sol: prepare 1.3-1.5mol / L Al(NO 3 ) 3 Pour the solution into a three-necked flask, heat it in a water bath under the reflux device, raise the temperature to 75-80°C, add ammonia water to adjust the pH value to 8-9, reflux at 90°C, and then titrate with 15% nitric acid to adjust the pH value 3 to 4, after a period of time the solution is clear and transparent, and A1 is prepared 2 o 3 Sol.

[0028] (3) Coating of aluminum sol: immerse the cordierite treated with nitric acid in step (1) into A1 prepared in step (2) 2 o 3 In the sol, 30-60min, take out the sol in the channel and blow off the sol with the ear washing ball, dry in a drying oven at 110°C for 10-12 hours, bake in a muffle furnace at 500°C for 3-5h, repeat the a...

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Abstract

The invention relates to a Fe2O3 / Al2O3 / cordierite catalyst and a preparation method thereof. According to the invention, the catalyst comprises cordierite used as a carrier, an Al2O3 sol layer coated on the surface of the cordierite, and an iron oxide layer dispersed on the surface of the Al2O3 sol layer; the preparation method comprises the following steps: pretreatment of the carrier, preparation of aluminum sol, coating of the aluminum sol and impregnation of Fe(NO3)3; and NOX in industrial flue gas is removed with the Fe2O3 / Al2O3 / cordierite monolithic catalyst as the catalyst and with hydrocarbon as a reducing agent. The invention has the following beneficial effects: the aluminum sol is well coated on the surface of the cordierite, so a thin layer of amorphous aluminium oxide is formed; nanometer-grade iron oxide is uniformly dispersed on the aluminium oxide coating, so an SCR active center is formed; and the hydrocarbon is used as the reducing agent, so highly-efficient denitration efficiency is obtained.

Description

technical field [0001] The invention belongs to the field of catalyst materials and their preparation and application, in particular to a Fe 2 o 3 / Al 2 o 3 / cordierite catalyst and preparation method thereof. Background technique [0002] At present, the industrial flue gas denitrification SCR process mainly uses NH 3 As a reducing agent to eliminate NO, the commonly used catalyst is V 2 o 5 -WO 3 / TiO 2 . The main problem is that the reducing agent NH 3 The cost is high and it has a certain toxicity. The NH in the process 3 The leakage and unreacted NH 3 The emission will pollute the environment; the cost of vanadium-based catalysts is high, it is toxic, and it is easy to cause secondary pollution after treatment. Due to the rich source of hydrocarbons, and in NO X There are hydrocarbons in the pollution source at the same time, and the hydrocarbons are used as reducing agents to achieve simultaneous elimination of coexisting pollutants. Fe, Cu, V, Ce and ot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01D53/86B01D53/56
Inventor 苏亚欣周皞廖文裕
Owner DONGHUA UNIV
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