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SBA-15 loaded high dispersion nickel catalyst modified by hole wall carbon and its preparation method

A nickel catalyst, highly dispersed technology, used in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc.

Inactive Publication Date: 2011-04-13
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Can be used for hydrogenation, reforming reaction, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 12.0g P123 into a beaker, add 90ml H 2 O and 360ml 2mol / L HCl, stirred in a water bath at 35-38°C for 1 hour, added 25.5g ethyl orthosilicate, continued to stir in a water bath at 35-38°C for 24 hours, and aged at 80°C for 24 hours; After the filter cake was dried at room temperature, it was put into a high-purity N 2 baked in a tube furnace at 500°C for 6h with a heating rate of 1°C / min, N 2 The flow rate is 60ml / min. Obtain SBA-15C light gray powder with carbon-modified pore walls, with a surface area of ​​719m 2 / g.

Embodiment 2

[0024] Weigh 1.30g Ni(NO 3 ) 2 ·6H 2 O was placed in an evaporating dish, and 17.0ml of distilled water was added to stir to dissolve it, then 5.15g of SBA-15C was weighed and added to the above solution, stirred for 10min, left at room temperature for 24h, then vacuum-dried for 24h, and then placed in a 2 baked at 400°C for 4h in a tube furnace with a heating rate of 2°C / min, N 2 The flow rate is 60ml / min. A dark gray supported nickel catalyst was obtained. The mass percent content of Ni in the catalyst was measured to be 5.2%. with H 2 The degree of dispersion of metallic nickel measured by adsorption method is 26%, and the degree of reduction is 100% (nickel catalyst is used H 2 Reduction, the reduction condition is 400°C, 4h, the heating rate is 1°C / min, H 2 Flow rate is 30ml / min), H 2 Adsorption capacity 120μmol / g-catalyst, active metal surface area 9.4m 2 Ni / g-catalyst.

Embodiment 3

[0028] Weigh 2.45g Ni(NO 3 ) 2 ·6H 2 O was placed in an evaporating dish, and 17.0ml of distilled water was added to stir to dissolve it, then 5.15g of SBA-15C was weighed and added to the above solution, stirred for 10min, left at room temperature for 24h, then vacuum-dried for 24h, and then placed in a 2 baked at 400°C for 4h in a tube furnace with a heating rate of 2°C / min, N 2 The flow rate was 60ml / min, and a dark gray supported nickel catalyst was obtained. The Ni content of the catalyst was found to be 9.0%. with H 2 It is 32% that the dispersion degree of metallic nickel measured by adsorption method is 32%, and the degree of reduction is 100% (the nickel catalyst is used H before the measurement). 2 Reduction, the reduction condition is 400°C, 4h, the heating rate is 1°C / min, H 2 Flow rate is 30ml / min), H 2 Adsorption capacity 239μmol / g-catalyst, active metal surface area 18.7m 2 Ni / g-catalyst.

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Abstract

The invention discloses a high-dispersion nickel catalyst loaded by SBA-15 with pore wall decorated by carbon and a preparation method thereof. The SBA-15 which is provided with a pore wall that is decorated by carbon is synthesized by taking the P123 as a template and roasted by inert gases, so as to lead the gained SBA-15 to contain little carbon (accounting for about 3% of the mass percentage), thus having decoration effects on the surface of the gained SBA-15. Compared with normal SBA-15 carriers, the nickel catalyst prepared by taking the SBA-15 with the pore wall decorated by the carbonas the carrier has higher nickel surface and nickel dispersion. The catalyst of the invention is used for toluene hydrogenation and leads the reaction temperature to be reduced by 40-75 DEG C.

Description

1. Technical field: [0001] The invention relates to a SBA-15 loaded highly dispersed nickel catalyst modified by pore wall carbon and a preparation method thereof. 2. Background technology: [0002] Nickel catalysts can be used industrially for hydrogenation, reforming and hydrocarbon synthesis reactions (US Pat. No. 4,142,962). Typical hydrogenation reactions include hydrogenation of olefins to saturated hydrocarbons, hydrogenation of aromatic compounds such as benzene and toluene, etc. (US Patent No. 3,868,332). Traditional supported nickel catalysts use high specific surface oxides such as SiO 2 、Al 2 o 3 etc. are prepared by impregnating the nickel salt on the carrier. Studies have shown that the catalytic activity of supported nickel catalysts is directly related to the effective surface area of ​​metallic nickel on the catalyst. The larger the surface area of ​​nickel on the catalyst per unit mass, the higher the catalytic activity and the longer the catalyst life ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755B01J29/00
Inventor 沈俭一朱海燕傅玉川薛明伟
Owner NANJING UNIV
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