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Nanoscale cerium-zirconium solid solution composite oxide, preparation method, catalyst by adoption of nanoscale cerium-zirconium solid solution composite oxide and purpose thereof

A cerium zirconium solid solution, composite oxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. Excellent performance, catalytic activity, small size effect

Inactive Publication Date: 2018-09-28
NINGBO URBAN ENVIRONMENT OBSERVATION & RES STATION NUEORS CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to efficiently convert CH 4 At present, the noble metal content of three-way catalysts for commercial natural gas vehicles is three times that of three-way catalysts for gasoline vehicles, resulting in a significant increase in the cost of catalysts

Method used

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  • Nanoscale cerium-zirconium solid solution composite oxide, preparation method, catalyst by adoption of nanoscale cerium-zirconium solid solution composite oxide and purpose thereof
  • Nanoscale cerium-zirconium solid solution composite oxide, preparation method, catalyst by adoption of nanoscale cerium-zirconium solid solution composite oxide and purpose thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A nanoscale cerium-zirconium solid solution composite oxide (Ce 0.9 Zr 0.1 o 2 ) and its prepared catalyst (Pd / Ce 0.9 Zr 0.1 o 2 ).

[0046] Preparation:

[0047] 1. Preparation of nano-scale cerium-zirconium solid solution composite oxide

[0048] Using Ce(NO 3 ) 3 ·6H 2 O as Ce source, with Zr(NO 3 ) 4 ·5H 2 O was used as Zr source and NaOH was used as precipitant. More specifically, the following steps are included:

[0049] Firstly, cerium nitrate and zirconium nitrate were prepared into a solution, stirred and dissolved, and an appropriate amount of NaOH solution was added thereto, stirred for 1 hour, and then hydrothermally reacted in an oven at 100°C for 12 hours. Suction filter and wash the reaction product, then place it in a 60°C oven to dry overnight, and finally bake it in an air atmosphere at 550°C for 4h to obtain Ce 0.9 Zr 0.1 o 2 nanomaterials.

[0050] Two, preparation catalyst (Pd / Ce 0.9 Zr 0.1 o 2 )

[0051] A certain amount of P...

Embodiment 2-5

[0053] The difference between Examples 2-5 and Example 1 is that the molar ratios of Ce and Zr in the cerium-zirconium solid solution composite oxide are different, which are respectively 1:9, 3:7, 5:5 and 7:3, and the obtained cerium Zirconium solid solution is the series Ce 0.1 Zr 0.9 o 2 、Ce 0.3 Zr 0.7 o 2 、Ce 0.5 Zr 0.5 o 2 and Ce 0.7 Zr 0.3 o 2 nanomaterials.

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Abstract

The invention discloses a nanoscale cerium-zirconium solid solution composite oxide, a preparation method, a catalyst by the adoption of the nanoscale cerium-zirconium solid solution composite oxide and application in equivalent proportion combustion for gas-fueled automobile exhaust gas treatment. The method of the invention comprises the following steps: 1) preparing a reaction solution by the use of cerium salt and zirconium salt, adding a precipitating agent and carrying out a hydrothermal reaction; 2) roasting to obtain the nanoscale cerium-zirconium solid solution composite oxide. The preparation method of the invention is simple and is easy to operate. The obtained cerium-zirconium solid solution composite oxide contains lots of surface oxygen vacancies and is rich in high-concentration trivalent cerium on the surface. By applying the nanoscale cerium-zirconium solid solution composite oxide as a carrier to a catalyst, catalytic performance of the catalyst is enhanced. A Pd / CexZr1-Xo2(x is less than 1 and greater than 0) catalyst formed by using the cerium-zirconium solid solution as a carrier can be used in treatment of gas-fueled automobile exhaust gas or simulated flue gas with complex components, can achieve high-efficiency conversion of CH4 under the conditions of high water and high concentration CO2, and also has high NO and CO conversion efficiency during equivalent proportion combustion.

Description

technical field [0001] The invention belongs to the technical field of natural gas vehicle tail gas treatment, and relates to a nano-scale cerium-zirconium solid solution composite oxide, a preparation method, a catalyst using the same and its application, especially to a nano-scale cerium-zirconium solid solution composite oxide, a preparation method, and a nano-scale cerium-zirconium solid solution composite oxide. Catalyst and the use of the catalyst in the treatment of exhaust gas from vehicles with equivalent combustion of natural gas. Background technique [0002] In 2016, the number of motor vehicles in my country was as high as 295 million. Exhaust emissions have become an important source of air pollution in my country. They are an important cause of photochemical smog and haze, which directly threaten the health of the people. According to estimates, my country will add more than 100 million motor vehicles in the next five years, and the consumption of gasoline and...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J23/63B01J35/02B01J37/03B01J37/08B01J37/10F01N3/28
CPCF01N3/2803B01J23/10B01J23/63B01J37/031B01J37/08B01J37/10F01N2370/02F01N2370/04B01J35/40Y02A50/20
Inventor 贺泓张燕连志华单文坡王猛
Owner NINGBO URBAN ENVIRONMENT OBSERVATION & RES STATION NUEORS CHINESE ACADEMY OF SCI
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