Manganese-based oxide catalyst

A technology of manganese-based oxides and catalysts, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical/physical processes, etc. There are many raw materials, etc., to achieve the effect of low cost, low preparation temperature and short cycle

Inactive Publication Date: 2018-08-03
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2012, Weichao Wang et al. [Science.2012, 337, 832-835] discovered manganese-based mullite (Sm, Gd) Mn 2 o 5 It has good catalytic activity for NO, but the preparation process of its co-precipitation is complicated, many raw materials are involved in the synthesis process, the processing temperature is high, and the energy consumption of future industrialization will be large
In 2013, the Shan Bin team of Huazhong University of Science and Technology prepared mullite with different compositions [CN 104624

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0053] LaMn 2 O 5 : 0.001mol of lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O) Dissolve in 30ml of deionized water, stir for a while, then weigh out 0.0006mol of potassium permanganate and 0.0014mol of manganese chloride respectively, and add the weighed potassium permanganate and manganese chloride to lanthanum nitrate at the same time In the aqueous solution, magnetically stir for 30min, while adding water to 50ml. Weigh 1.6g sodium hydroxide and make 4mol L -1 The solution is added dropwise to the above solution, magnetically stirred for 10 minutes, and then the above solution is transferred to the reactor (the solution accounts for 60%-80% of the reactor volume), heated to 240°C, and reacted for 24 hours. After the reaction is over, cool to room temperature, wash the obtained product with deionized water for 2-3 times, then wash with dilute nitric acid for 1-2 times, and then wash with deionized water for 2-3 times, then dry and grind to obtain the product .

Embodiment 2

[0055] PrMn 2 O 5 :The weighed 0.0005mol praseodymium nitrate (Pr(NO 3 ) 3 ·6H 2 O) Dissolve in 30ml of deionized water, stir for a while, then weigh 0.0003mol of potassium permanganate and 0.0007mol of manganese acetate, and add the weighed potassium permanganate and manganese acetate to the aqueous solution of praseodymium nitrate at the same time In the medium, magnetic stirring for 30 minutes, while adding water to 50ml. Weigh 0.48g sodium hydroxide and make 4mol L -1 The solution is added dropwise to the above solution, magnetically stirred for 10 minutes, and then the above solution is transferred to the reactor (the solution accounts for 60%-80% of the reactor volume), heated to 240°C, and reacted for 12 hours. After the reaction is over, cool to room temperature, wash the obtained product with deionized water for 2-3 times, then wash with dilute nitric acid for 1-2 times, and then wash with deionized water for 2-3 times, then dry and grind to obtain the product .

Embodiment 3

[0057] NdMn 2 O 5 :The weighed 0.0005mol neodymium nitrate (Nd(NO 3 ) 3 ·6H 2 O) Dissolve in 30ml of deionized water, stir for a while, then weigh out 0.0003mol of potassium permanganate and 0.0007mol of manganese acetate respectively, and add the weighed potassium permanganate and manganese acetate to the aqueous solution of neodymium nitrate at the same time In the medium, magnetic stirring for 30 minutes, while adding water to 50ml. Weigh 0.48g sodium hydroxide and make 4mol L -1 The solution is added dropwise to the above solution, magnetically stirred for 10 minutes, and then the above solution is transferred to the reactor (the solution accounts for 60%-80% of the reactor volume), heated to 240°C, and reacted for 12 hours. After the reaction is over, cool to room temperature, wash the obtained product with deionized water for 2-3 times, then wash with dilute nitric acid for 1-2 times, and then wash with deionized water for 2-3 times, then dry and grind to obtain the produc...

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Abstract

The invention provides a manganese-based oxide catalyst. The catalyst is characterized in that the catalyst is a mullite oxide having a general formula of RMn2O5, wherein R is Pr, Nd, Eu, Gd, Tb, Dy,Ho, Er, Tm, Yb, Lu, Y or Bi. The catalyst can effectively catalytically oxidize nitrogen monoxide into nitrogen dioxide at a low temperature, has good aging resistance and good durability, and can effectively remove nitrogen oxides from automobile exhaust gas. A method for preparing the oxide has the advantages of few raw materials, simple steps, and convenience in operation. The hydrothermal synthesis method effectively reduces the preparation temperature of mullite to greatly save energy, and also has the characteristics of short preparation period, low device requirements and easiness in promotion.

Description

Technical field [0001] The invention relates to a manganese-based oxide catalyst. Background technique [0002] With the development of industry, the pollution problem of nitrogen oxide pollutants has become increasingly prominent. At present, one of the effective technologies for treating and purifying nitrogen oxide pollutants is the ammonia selective catalytic reduction technology (SCR). This technology uses ammonia, urea, etc. as reducing agents, and when the oxygen concentration is high, it x Under the condition of high concentration, the catalyst selectively preferentially reduces NO x Reduce to N 2 , Where NO is oxidized to form NO 2 It is the decision step of the SCR reaction process. The design and preparation of NO oxidation catalyst is the key to the entire SCR. [0003] Commercial catalysts are mainly precious metals (Pt, Pd, etc.) [Journal of Catalysis.2000, 196, 293-301] series and vanadium titanium tungsten oxide (VO x / WO x / TiO 2 ) [Catalysis Letters. 1996, 41, 35...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01D53/56B01D53/86
CPCB01D53/8628B01J23/002B01J23/34Y02A50/20
Inventor 王卫超杨志
Owner NANKAI UNIV
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