Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of cerium-based catalyst supporting transition metal oxide and its preparation method and application

A cerium-based catalyst and transition metal technology, applied in metal/metal oxide/metal hydroxide catalyst, catalyst activation/preparation, physical/chemical process catalyst, etc., can solve the problem of narrow operating temperature window, poor high temperature thermal stability, N2 selectivity decline and other issues, to achieve the effect of wide operating temperature window

Active Publication Date: 2020-12-25
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI +1
View PDF4 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of cerium-based catalyst supporting transition metal oxide and its preparation method and application
  • A kind of cerium-based catalyst supporting transition metal oxide and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The cerium-based catalyst of the supported transition metal oxide of the present embodiment is made of 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 oxide 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)...

Embodiment 2

[0050] The cerium-based catalyst of the supported transition metal oxide of the present embodiment is made of 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 oxide 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 carri...

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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a cerium-based catalyst supporting transition metal oxide and its preparation method and use. In the cerium-based catalyst supporting transition metal oxides of the present invention, the carrier of the catalyst is CeO 2 , the active component is a transition metal oxide supported on the carrier, with the CeO 2 When the mass of the carrier is 100%, the mass of the transition metal oxide is 5 to 20%. The cerium-based catalyst supporting transition metal oxides of the present invention has close to 100% NO in the temperature range of 200 to 440°C. x Purification efficiency, wide operating temperature window. The preparation method of the present invention is simple, and the prepared cerium-based catalyst supporting transition metal oxide can be used for NH 3 ‑SCR process catalytically purifies NO x .

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a cerium-based catalyst loaded with transition metal oxides, 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-zircon...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/20B01J23/28B01J23/30B01J37/02B01J37/08B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/20B01J23/28B01J23/30B01J37/0201B01J37/088B01D2251/2062B01D2258/0283B01J35/50B01J35/40
Inventor 贺泓连志华单文坡张燕朱娜
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI