Cerium oxide-based precious metal nanometer catalyst and preparation method thereof

A nano-catalyst, cerium oxide-based technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. It is prone to problems such as sintering and structural instability, so as to achieve the effect of stable catalytic material structure, simple preparation process and improved structural stability

Inactive Publication Date: 2017-03-08
NAT UNIV OF SINGAPORE SUZHOU RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because cerium oxide has a good oxygen storage capacity, it plays an important role in three-way catalysts, solid fuel cells, solid catalysts, etc., and is a widely used catalyst carrier. However, its high tem...

Method used

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  • Cerium oxide-based precious metal nanometer catalyst and preparation method thereof
  • Cerium oxide-based precious metal nanometer catalyst and preparation method thereof
  • Cerium oxide-based precious metal nanometer catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] [Example 1] Preparation of Ir / CeO 2 -1023K-4h and Ir / CeO 2 -1073K-4h catalyst

[0039] This embodiment is Ir / CeO 2 -1023K-4h and Ir / CeO 2 -The embodiment of the preparation method of 1073K-4h catalyst, comprises following preparation steps:

[0040] a. Dissolving an appropriate amount of cerium nitrate (final concentration of 0.03-0.06mol / L) in 200mL of deionized water, mixed uniformly to obtain a mixed solution of cerium nitrate;

[0041] b. Dissolving urea (2mol / L-4mol / L) in 200mL deionized water until completely dissolved to obtain an aqueous urea solution;

[0042] c. the cerium nitrate solution obtained in step a is quickly poured into the aqueous urea solution obtained in step b, and fully stirred for 30 minutes to obtain the mixture;

[0043] d. Heat the mixture obtained in step c to 90°C in a water bath and keep the temperature constant for 4-5 hours to obtain a suspension;

[0044] e. filter and wash the suspension obtained in step d, then dry at 100°C fo...

Embodiment 2

[0049] [Example 2] Preparation of Ir / Ce 0.9 La 0.1 o 2 -1073K-4h catalyst

[0050] This embodiment is Ir / Ce 0.9 La 0.1 o 2 -The embodiment of the preparation method of 1073K-4h catalyst, comprises following preparation steps:

[0051] a. an appropriate amount of cerium nitrate (0.06mol / L) and lanthanum nitrate (0.0067mol / L) are dissolved in 200mL deionized water, mix well, wherein the mol ratio of cerium nitrate and lanthanum nitrate is 9:1, obtains cerium nitrate and a mixed solution of lanthanum nitrate;

[0052] b. Dissolving urea (2mol / L-4mol / L) in 200mL deionized water until completely dissolved to obtain an aqueous urea solution;

[0053] c. The mixed solution of cerium nitrate and lanthanum nitrate obtained in step a is quickly poured into the aqueous urea solution obtained in step b, and fully stirred for 30 minutes to obtain the mixture;

[0054] d. Heat the mixture obtained in step c to 90°C in a water bath and keep the temperature constant for 4-5 hours to o...

Embodiment 3

[0060] [Example 3] Preparation of Ir / Ce 0.9 La 0.1 o 2 -1123K-4h catalyst

[0061] This embodiment is Ir / Ce 0.9 La 0.1 o 2 -The embodiment of the preparation method of 1123K-4h catalyst, comprises following preparation steps:

[0062] a. Dissolve an appropriate amount of cerium nitrate (0.06mol / L) and lanthanum nitrate (0.0067mol / L) in 200mL deionized water, the molar ratio of cerium nitrate and lanthanum nitrate is 9:1, mix well to obtain cerium nitrate and lanthanum nitrate mixed solution;

[0063] b. Dissolving urea (2mol / L-4mol / L) in 200mL deionized water until completely dissolved to obtain an aqueous urea solution;

[0064] c. Pour the mixed solution of cerium nitrate and lanthanum nitrate obtained in step a into the aqueous urea solution obtained in step b quickly, and fully stir to obtain the mixture for 30 minutes;

[0065] d. Heat the mixture obtained in step c to 90°C in a water bath and keep the temperature constant for 4-5 hours to obtain a suspension;

...

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PUM

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Abstract

The invention provides a method for preparing a cerium oxide-based precious metal nanometer catalyst, the catalyst prepared by the method and application of the catalyst. The catalyst can still maintain the high dispersion of precious metals after the catalyst is calcinated at 750 DEG C or 850 DEG C, and the catalyst has higher activity and better stability in the methane activation conversion reaction. A preparation process is simple, and the structure of the catalytic material is stable at a high temperature. The catalyst has potential application value in the methane activation and conversion such as the high temperature gas phase reactions of methane dry reforming and methane steam reforming.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic nanometer catalysts, and in particular relates to a catalyst which does not cause sintering of precious metals under high temperature conditions and a preparation method thereof. Background technique [0002] Noble metal (such as Pt, Rh, Pd, and Au, etc.) nanocatalysts have a wide range of industrial applications due to their excellent catalytic activity and stability, such as hydrogenation, dehydrogenation, oxidation, isomerization, and cracking. . Due to the high price of noble metals, the noble metal content used in noble metal catalysts is generally lower than 10 wt%, such as common Pd / C catalysts. In order to obtain better catalytic stability, most industrial catalysts bind noble metal nanoparticles in ordered porous materials (such as molecular sieve SBA, etc.), which not only improves their dispersion, but also limits the movement of noble metal nanoparticles, thereby To ...

Claims

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Application Information

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IPC IPC(8): B01J23/63C01B3/40
CPCY02P20/52
Inventor 王发根杨娟张龙珠陈伟许国勤
Owner NAT UNIV OF SINGAPORE SUZHOU RES INST
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