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Supported bimetal nanocrystal catalyst and preparation method thereof

A bimetallic nano-catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of poor activity and stability, easy segregation, alloy low degree of alloying, etc., to achieve the effect of simple preparation method, improved catalyst selectivity, and improved alloying degree

Inactive Publication Date: 2013-06-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large number of studies have found that the current supported bimetallic catalysts have low alloying degree, large particle size, uneven dispersion, and prone to segregation during use, resulting in poor activity and stability, which is not conducive to industrial applications.

Method used

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  • Supported bimetal nanocrystal catalyst and preparation method thereof
  • Supported bimetal nanocrystal catalyst and preparation method thereof
  • Supported bimetal nanocrystal catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A. Weigh 0.6800gMg(NO 3 ) 2 ·6H 2 O, 0.0012gGa(NO 3 ) 3 ·xH 2 O was dissolved in 50mL deionized water to prepare a metal salt solution and stirred evenly;

[0033] B, take by weighing 1.1449g urea and be dissolved in the prepared mixed salt solution of step A, stir;

[0034] C. Transfer the above-mentioned mixed solution to a hydrothermal kettle, weigh 2.0000g of spherical alumina calcined at 1150°C and add it, and conduct a crystallization reaction at 130°C for 6 hours. The obtained product is washed until the pH value of the supernatant = 7, and the solid particles are dried in an oven at 70°C to obtain MgGaAl-LDHsAl 2 o 3 sample;

[0035] D. Weigh 0.0011g NaCl and 0.0017g PdCl at a molar ratio of 2:1 2 Dissolved in 10ml of deionized water, prepared as metal Pd precursor Na 2 PdCl 4 Solution; Weigh 2.0000g step C gained precursor, place in Na 2 PdCl 4 Soak in the solution, shake once every five minutes, pour out the remaining solution after one hour of im...

Embodiment 2

[0039] A. Weigh 0.6800gMg(NO 3 ) 2 ·6H 2 O, 0.0121g Ga(NO 3 ) 3 ·xH 2 O was dissolved in 50mL deionized water to prepare a metal salt solution and stirred evenly;

[0040] B, take by weighing 1.1449g urea and be dissolved in the prepared mixed salt solution of step A, stir;

[0041] C. Transfer the above-mentioned mixed solution to a hydrothermal kettle, weigh 2.0000g of spherical alumina calcined at 1150°C and add it, and conduct a crystallization reaction at 130°C for 6 hours. The obtained product is washed until the pH value of the supernatant = 7, and the solid particles are dried in an oven at 70°C to obtain MgGaAl-LDHsAl 2 o 3 sample;

[0042] Step D is the same as embodiment 1

[0043] E. Place the catalyst precursor obtained in step D in an atmosphere furnace for high-temperature roasting and reduction, and the reducing gas is 10% H 2 / Ar, control the heating rate to 2°C min -1 , heated up to 550°C for 6 hours, cooled naturally to obtain PdGa 5 / MgO-Al 2 o ...

Embodiment 3

[0046] A. Weigh 0.6800gMg(NO 3 ) 2 ·6H 2 O, 0.0024g Ga(NO 3 ) 3 ·xH 2 O was dissolved in 50mL deionized water to prepare a metal salt solution and stirred evenly;

[0047] B, take by weighing 1.1449g urea and be dissolved in the prepared mixed salt solution of step A, stir;

[0048] C. Transfer the above-mentioned mixed solution to a hydrothermal kettle, weigh 2.0000g of spherical alumina calcined at 1150°C and add it, and conduct a crystallization reaction at 130°C for 6 hours. The obtained product is washed until the pH value of the supernatant = 7, and the solid particles are dried in an oven at 70°C to obtain MgGaAl-LDHsAl 2 o 3 sample;

[0049] Step D is the same as embodiment 1

[0050] E. Place the catalyst precursor obtained in step D in an atmosphere furnace for high-temperature roasting and reduction, and the reducing gas is 10% H 2 / Ar, control the heating rate to 2°C min -1 , heated up to 550°C for 6 hours, then cooled naturally to obtain PdGa / MgO-Al 2 ...

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Abstract

The invention provides a supported bimetal nanocrystal catalyst which is a binary bimetal catalyst taking aluminum oxide as a supporter and is abbreviated to P-M / MgO-AlO3, wherein P represents noble metal such as Pd, Au, Pt, Ag and the like, and M represents one or two of metal cations such as Cu<2+>, Zn<2+>, Ni<2+>, Ga<3+> and Fe<3+>. The particle size of the P-M bimetal nanocrystal is 2-10 nm, the dimension distribution is narrow, the nanocrystal particles are highly dispersed on the surface of the supporter uniformly and stably, and the crystal form is complete. The preparation method of the catalyst comprises the following steps: preparing soluble Mg<2+> salt for MgMAl-LDH (layered double hydroxide) preparation and an endogenous active metal salt solution into a mixed solution; then simultaneously adding precipitant and the aluminum oxide supporter into the reaction system; enabling hydrotalcite to grow on the surface of the aluminum oxide supporter through an in-situ growth method; supporting exogenous active metal through a wet impregnation method; and performing high-temperature reduction on the obtained catalyst precursor under a reducing atmosphere, thus obtaining the supported bimetal nanocrystal catalyst which is stably and highly dispersed.

Description

technical field [0001] The invention relates to the field of catalyst preparation, in particular to a highly dispersed and supported bimetallic nanocrystal catalyst with alumina as a carrier and a preparation method. The catalyst can be applied to various reaction processes in petrochemical, organic chemistry and other fields. Background technique [0002] Precious metal catalysts are classified according to the main active metals, commonly used are: silver catalyst, platinum catalyst, palladium catalyst and rhodium catalyst. Precious metal catalysts are highly valued for their excellent activity, selectivity and stability, and are widely used in reactions such as hydrogenation, dehydrogenation, oxidation, reduction, isomerization, aromatization, cracking, and synthesis. , petrochemical, pharmaceutical, environmental protection and new energy and other fields play a very important role. [0003] Supported noble metal catalyst is a catalyst that supports noble metal componen...

Claims

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Application Information

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IPC IPC(8): B01J23/62
Inventor 李殿卿梁琳琳冯俊婷冯拥军唐平贵贺宇飞
Owner BEIJING UNIV OF CHEM TECH
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