Low alkane-to-olefin catalyst by dehydrogenation and preparation method

A catalyst and a technology for producing olefins, which are applied in the field of catalyst and catalyst preparation to achieve good environmental protection advantages, increase electron cloud density, and reduce surface acidity.

Inactive Publication Date: 2016-01-06
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no literature report on the use of nickel phosphide catalysts in the dehydrogenation of low-carbon alkanes.

Method used

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  • Low alkane-to-olefin catalyst by dehydrogenation and preparation method
  • Low alkane-to-olefin catalyst by dehydrogenation and preparation method
  • Low alkane-to-olefin catalyst by dehydrogenation and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A preparation method of a low-carbon alkane dehydrogenation olefin catalyst, comprising the steps of:

[0033] (1) Take 10gSiO2 2 Pellets, dried at 200°C for 12 hours; 10g SiO 2 The saturated water absorption of the pellet is 10ml; SiO 2 The specific surface area of ​​the ball is 500m 2 / g, particle size is 2mm;

[0034] (2) 4.955gNi(NO 3 )·6H 2 O, 1.96gNH 4 h 2 PO 4 with 0.95gCsNO 3 Add 10ml of water to obtain a mixed solution, SiO 2 The pellets are immersed in the mixed solution;

[0035] (3) shaking for 4 hours, standing for 4 hours, drying at 120°C for 12 hours, and calcining for 4 hours at 500°C under a nitrogen atmosphere to obtain a catalyst precursor;

[0036] (4) Take 0.5g of the catalyst precursor, put it into a stainless steel fixed-bed reactor with an inner diameter of 8mm, and then raise the temperature to 700°C at a heating rate of 2°C / min under a hydrogen flow of 50mL / min, and then raise the temperature to 700°C. After constant temperature red...

Embodiment 2

[0039] A preparation method of a low-carbon alkane dehydrogenation olefin catalyst, comprising the steps of:

[0040] (1) Take 10g of activated carbon pellets and dry them at 200°C for 12 hours; the saturated water absorption of 10g of activated carbon pellets is 8ml; the specific surface area of ​​activated carbon pellets is 1200g / m 2 , the particle size is 2mm;

[0041] (2) 4.955gNi(NO 3 )·6H 2 O, 1.96gNH 4 h 2 PO 4 with 0.95gCsNO 3 Add 8ml of water to obtain a mixed solution, and soak the activated carbon pellets in the mixed solution;

[0042] (3) shaking for 4 hours, standing for 4 hours, drying at 120°C for 12 hours, and calcining for 4 hours at 500°C under a nitrogen atmosphere to obtain a catalyst precursor;

[0043] (4) Take 0.5g of the catalyst precursor, put it into a stainless steel fixed-bed reactor with an inner diameter of 8mm, and then raise the temperature to 700°C at a heating rate of 2°C / min under a hydrogen flow of 50mL / min, and then raise the temper...

Embodiment 3

[0046] A preparation method of a low-carbon alkane dehydrogenation olefin catalyst, comprising the steps of:

[0047] (1) 10gSiO 2 Dry the pellets at 150°C for 16 hours; 10g SiO 2 The saturated water absorption of the ball is 8ml; SiO 2 The specific surface area of ​​the pellet is 300g / m 2 , the particle size is 1mm;

[0048] (2) Add nickel nitrate, ammonium dihydrogen phosphate and potassium nitrate to SiO 2 The ball is saturated in water with water absorption, and a mixed solution is obtained, and the SiO 2 The pellets are immersed in the mixed solution, the SiO 2 The mass ratio of pellets, Ni and potassium is 1:0.02:0.01, and the P / Ni molar ratio is 0.5;

[0049] (3) shaking for 1 hour, standing for 2 hours, drying at 80°C for 48 hours, and calcining for 2 hours at 400°C under a nitrogen atmosphere to obtain a catalyst precursor;

[0050] (4) The catalyst precursor was heated to 500°C at a heating rate of 1°C / min under a hydrogen flow of 20mL / min, and was reduced at ...

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Abstract

The invention discloses a low alkane-to-olefin catalyst by dehydrogenation and a preparation method. The catalyst is loaded with nickel phosphide and alkaline metals by taking SiO2 spheres or active carbon spheres as a carrier, wherein the mass ratio of the carrier to Ni to the alkaline metals is 1: (0.02-0.2): (0.01-0.2) and the P / Ni molar ratio is 0.5-1.5. In the aspect of dehydrogenation performance of the low-carbon alkane of the catalyst, compared with commercially available d Pt-serial catalysts, the iso-butane conversion ratio is slightly high, and the iso-butane selectivity is equivalent. However, compared with the existing industrially applied PT-serial catalyst preparation process, the preparation cost is low. Compared with Cr-serial catalysts, the catalyst further has a good environmental-friendly advantage.

Description

technical field [0001] The invention relates to a catalyst for chemical reaction and a preparation method of the catalyst, in particular to a catalyst and a preparation method for preparing corresponding olefins by dehydrogenating low paraffins. technical background [0002] C 2 ~C 4 Paraffins come from natural gas, oilfield associated gas, petrochemical and oil refining enterprises, and are rich in resources and low in price. With the depletion of petroleum resources, it has become inevitable that low-carbon alkanes are used as chemical raw materials to replace and supplement petroleum. Using them as raw materials to directly dehydrogenate corresponding olefins is very attractive in terms of technology and business. A research hotspot in the field of catalysis. The above-mentioned direct dehydrogenation of low-carbon alkanes to olefins is a strongly endothermic, reversible, molecular number-increasing reaction, which is limited by thermodynamic equilibrium. This reactio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185C07C11/09C07C5/333
Inventor 王希涛王康
Owner TIANJIN UNIV
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