Cerium-based catalyst loaded with transition metal as well as preparation method and purpose thereof

A technology of cerium-based catalysts and transition metals, applied in the field of cerium-based catalysts loaded with transition metals and its preparation, can solve the problems of poor high temperature thermal stability, decreased N2 selectivity, narrow operating temperature window, etc., and achieve high selectivity and operation The effect of wide temperature window and high catalytic activity

Active Publication Date: 2017-11-28
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the active component vanadium in this type of catalyst system has biological toxicity, narrow operating temperature window, and N 2 A large amount of O is generated to cause N 2 Disadvantages such as decreased selectivity and poor high temperature thermal stability

Method used

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  • Cerium-based catalyst loaded with transition metal as well as preparation method and purpose thereof
  • Cerium-based catalyst loaded with transition metal as well as preparation method and purpose thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] The cerium-based catalyst of the load transition metal of the present embodiment, by CeO 2 It is composed of the carrier and the transition metal oxide active component loaded on the carrier, the transition metal salt is niobium oxalate, CeO 2 Carrier is CeO 2 nanoparticles, CeO 2 The mass of carrier is 100%, and the mass of niobium oxalate is 20 %.

[0046] The preparation method of the cerium-based catalyst supporting transition metal comprises the following steps:

[0047] 1) Dissolve cerium nitrate in water, add sodium hydroxide and stir for 1 h, wherein the mass ratio of cerium nitrate to sodium hydroxide is 0.15:1, carry out hydrothermal reaction at 30° C. for 12 h, and the precipitated product obtained is washed with deionized water and Washed with absolute ethanol, dried in an oven at 60°C, and calcined in a muffle furnace at 550°C for 4 hours in an air atmosphere to obtain CeO 2 carrier;

[0048] 2) with the CeO obtained in step 1) 2 Add the nanoparticle...

Embodiment 2

[0050] The cerium-based catalyst of the load transition metal of the present embodiment, by CeO 2 It is composed of the carrier and the transition metal oxide active component loaded on the carrier, the transition metal salt is niobium oxalate, CeO 2 Carrier is CeO 2 For the nanorod, the mass of niobium oxalate is 20% based on the mass of the CeO2 carrier as 100%.

[0051] The preparation method of the cerium-based catalyst supporting transition metal comprises the following steps:

[0052] 1) Dissolve cerium nitrate in water, add sodium hydroxide and stir for 1 h, wherein the mass ratio of cerium nitrate to sodium hydroxide is 1:5, and react at 120°C for 12 h, and the obtained precipitated product is washed with deionized water and anhydrous Washed with ethanol, dried in an oven at 60 °C, and calcined in a muffle furnace at 550 °C for 4 h in an air atmosphere to obtain CeO 2 carrier;

[0053] 2) with the CeO obtained in step 1) 2 The nanorod carrier was added into niobiu...

Embodiment 3

[0055] The difference between this example and Example 2 is that the transition metal salt is ammonium metatungstate, and the rest are the same as Example 2.

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Abstract

The invention provides a cerium-based catalyst loaded with transition metal as well as a preparation method and a purpose thereof. For the cerium-based catalyst loaded with transition metal, a catalyst carrier is CeO2; active ingredients are transition metal oxides loaded on the carrier; through being metered by that the mass of the CeO2 carrier is 100 percent, the mass of the transition metal oxides is 5 to 20 percent. The cerium-based catalyst loaded with transition metal provided by the invention has the NOx purification efficiency being near 100 percent in the temperature range of 200 to 440 DEG C; the operation temperature window is wide. The preparation method is simple; the prepared cerium-based catalyst loaded with transition metal can be used for NOx catalytic purification in the NH3-SCR process.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a cerium-based catalyst loaded with transition metals, a preparation method and application thereof. Background technique [0002] Nitrogen oxides (NO x ) can cause major environmental problems such as haze, acid rain and photochemical smog, and control NO x Emissions are a major challenge in the field of environmental protection. Currently, in NH 3 Selective Catalytic Reduction of NO as Reductant x (NH 3 -SCR) used catalyst system is mostly V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 And the corresponding improved system, this kind of catalyst system is widely used in coal-fired power plants, industrial boilers and other stationary source flue gas denitrification purification processes, and has high NO x Purification efficiency and anti-SO 2 Toxic properties. [0003] CN104226296A discloses a vanadium-based supported medium-temperature SCR catalyst, which uses titanium-zirconium ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/20B01J23/28B01J23/30B01J37/02B01J37/08B01D53/86B01D53/56
CPCB01D53/8628B01D2251/2062B01D2258/0283B01J23/002B01J23/20B01J23/28B01J23/30B01J35/023B01J35/026B01J37/0201B01J37/088
Inventor 贺泓连志华单文坡张燕朱娜
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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