Preparation method and catalytic application of supported type high-dispersion nickel-based alloy catalyst

A nickel-based alloy, highly dispersed technology, applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as poor stability, improve conversion rate, Improved selectivity and ease of use

Inactive Publication Date: 2015-02-25
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its stability is poor, and it is necessary to selectively hydrogenate styrene and dienes, which are easy to form colloids and carbon deposits, at lower temperatures using supported metal catalysts to generate corresponding ethylbenzene and monoolefins.

Method used

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  • Preparation method and catalytic application of supported type high-dispersion nickel-based alloy catalyst
  • Preparation method and catalytic application of supported type high-dispersion nickel-based alloy catalyst
  • Preparation method and catalytic application of supported type high-dispersion nickel-based alloy catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A. 5g of γ-Al with a particle size of 20-40 mesh 2 o 3 Particles, Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, urea, fast join in 10ml deionized water, Ni and Co total mass fraction are 12wt%, different Ni / Co mass fraction ratio (m / n=3 / 1,2 / 1,1 / 1), urea:( Ni 2+ +Co 2+) was 2:1, vacuum impregnated for 1h, transferred to an autoclave, crystallized at 130°C for 24h, filtered, washed with deionized water until the pH was 7, and the loaded highly dispersed NiCoAl-LDHs were obtained / Al 2 o 3 Precursor (SEM figure and XRD spectrum see figure 1 with figure 2 );

[0023] B. NiCoAl-LDHs / Al 2 o 3 The precursor was dried at 70 °C for 10 h and then calcined at 450 °C for 4 h to obtain LP-NiCoO / Al 2 o 3 ;

[0024] C. The LP-NiCoO / Al prepared in step B 2 o 3 Packed in a miniature fixed-bed reactor, in N 2 Heat treatment at 500°C under protection for 0.5h, with a heating rate of 10°C / min; 2 and N at a flow rate of 30 mL / min 2 The mixed gas is reduced, the reduction...

Embodiment 2

[0043] A. 5g of γ-Al with a particle size of 20-40 mesh 2 o 3 Particles, Ni(NO 3 ) 2 ·6H 2 O, Zn(NO 3 ) 2 ·6H 2 O, urea, fast join in 10ml deionized water, Ni and Zn total mass fraction is 12wt%, different Ni / Zn mass fraction ratio (m / n=3 / 1,2 / 1,1 / 1), urea:( Ni 2+ +Zn 2+ ) was 2:1, vacuum impregnated for 1h, then transferred to an autoclave, crystallized at 130°C for 24h, filtered, washed with deionized water until the pH was 7, and the loaded highly dispersed NiZnAl-LDHs were obtained / Al 2 o 3 precursor;

[0044] B. NiZnAl-LDHs / Al 2 o 3 The precursor was dried at 70 °C for 10 h and then calcined at 450 °C for 4 h to obtain LP-NiZnO / Al 2 o 3 ;

[0045] C. The LP-NiZnO / Al prepared in step B 2 o 3 Packed in a miniature fixed-bed reactor, in N 2 Heat treatment at 500°C under protection for 0.5h, with a heating rate of 10°C / min; 2 and N at a flow rate of 30 mL / min 2 The mixed gas is reduced, the reduction temperature is 500°C, the reduction time is 3h, and the...

Embodiment 3

[0047] A. 5g of γ-Al with a particle size of 20-40 mesh 2 o 3 Particles, Ni(NO 3 ) 2 ·6H 2 O, Cu(NO 3 ) 2 ·3H 2 O, urea, fast join in 10ml deionized water, Ni and Cu total mass fraction are 12wt%, different Ni / Cu mass fraction ratio (m / n=3 / 1,2 / 1,1 / 1), urea:( Ni 2+ +Cu 2+) was 2:1, vacuum impregnated for 1h, then transferred to an autoclave, crystallized at 130°C for 24h, filtered, washed with deionized water until the pH was 7, and the loaded highly dispersed NiCuAl-LDHs were obtained / Al 2 o 3 precursor;

[0048] B. NiCuAl-LDHs / Al 2 o 3 The precursor was dried at 70 °C for 10 h and then calcined at 450 °C for 4 h to obtain LP-NiCuO / Al 2 o 3 ;

[0049] C. The LP-NiCuO / Al prepared in step B 2 o 3 Packed in a miniature fixed-bed reactor, in N 2 Heat treatment at 500°C under protection for 0.5h, with a heating rate of 10°C / min; 2 and N at a flow rate of 30 mL / min 2 The mixed gas is reduced, the reduction temperature is 500°C, the reduction time is 3h, and the...

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Abstract

The invention discloses a preparation method and a catalytic application of a supported type high-dispersion nickel-based alloy catalyst. The preparation method comprises the following steps: by virtue of an in-situ growth method, supporting Ni, M (M=Co, Zn, Cu, Fe, Cr and the like) metal in the form of hydrotalcite on the surface of a microsphere-form gamma-Al2O3 carrier with grain size of 20-40 meshes and in a duct of the microsphere-form gamma-Al2O3 carrier, namely growing lamellar precursor LDHs containing Ni and M metal ions outside and inside a Al2O3 particle to form supported type high-dispersion distribution, converting the lamellar precursor LDHs into a corresponding composite metal oxide by drying and roasting at high temperature, and reducing the composite metal oxide to obtain the supported type high-dispersion nickel-based alloy catalyst with NiM distributed on the outer surface and in the duct of the carrier particle. The supported type high-dispersion nickel-based alloy catalyst is applied to first selective hydrogenation reaction of cracked gasoline, so that the conversion rate, the selectivity and the stability of the catalyst can be effectively improved; and moreover, the supported type high-dispersion nickel-based alloy catalyst can be used for methane reforming, and catalyzing reaction of preparing low-carbon hydrocarbon and alcohol by virtue of CO and CO2 hydrogenation.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to the preparation of a loaded highly dispersed nickel-based alloy catalyst with alumina as a carrier by an in-situ growth method and its application in the field of one-stage selective hydrogenation of pyrolysis gasoline. Background technique [0002] Pyrolysis gasoline is a valuable by-product of industrial high-temperature naphtha thermal cracking to produce ethylene and propylene, accounting for 50% to 80% of ethylene production, and its C 5 + ~C 12 + Hydrocarbons are the main components, which contain a large amount of aromatics (40-80%, benzene, toluene, xylene), dienes, olefins and alkanes, so pyrolysis gasoline is often used as high-octane gasoline blending oil or triphenyl extraction Raw materials. However, its stability is poor, and it is necessary to selectively hydrogenate styrene and dienes, which are easy to form colloids and carbon deposit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J23/80B01J23/86C10G45/48
CPCB01J21/04B01J23/755B01J23/80B01J23/86C10G45/48
Inventor 张法智项建峰闻鑫杨志祥
Owner BEIJING UNIV OF CHEM TECH
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