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Cobalt-base catalyst and preparation method thereof

A technology of cobalt-based catalyst and cobalt salt, applied in the field of catalytic chemistry, can solve the problems of complex process, high production cost, and restriction of wide application.

Inactive Publication Date: 2017-06-09
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex process and high production cost of this process, the wide application of coal-based Fischer-Tropsch synthesis to prepare clean liquid fuels has been restricted to a certain extent.

Method used

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Examples

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preparation example Construction

[0028] Correspondingly, the present invention also provides a method for preparing a cobalt-based catalyst, comprising the following steps: adding molecular sieves and silicon oxide to the cobalt salt solution, stirring to obtain a suspension; evaporating the solvent in the suspension to dryness , and then dried in an oven to obtain a solid; the solid is calcined in an air atmosphere at a calcining temperature of 400-600° C. to obtain a cobalt-based catalyst.

[0029] As a preferred version, the cobalt salt solution is preferably an aqueous solution or an alcohol solution of a cobalt salt, and the solvent in the cobalt salt solution is selected from water, ethanol, n-propanol, isopropanol, n-butanol, and isobutanol. one or several. In order to improve the reduction degree of metal cobalt, the cobalt salt in the cobalt salt solution is selected from one or more of cobalt chloride, cobalt nitrate, and cobalt acetate; the mass concentration of the cobalt salt solution is 10%-40% ...

Embodiment 1

[0039] 10Co / 20SiO 2 Preparation of -70ZSM-5 catalyst: Weigh 5.47 g of cobalt nitrate hexahydrate, add it into 100 mL of deionized water, and dissolve it ultrasonically to obtain a cobalt nitrate solution. Weigh 7g of ZSM-5 molecular sieve with a silicon-aluminum ratio of 15 and 2g of silicon oxide (pore size 10nm), add to the above cobalt nitrate solution, and stir at room temperature for 4h. Then the solvent in the above suspension was evaporated to dryness, and the evaporated solid was dried in an oven at 120° C. for 6 h. The dried solid was heated in a muffle furnace to 550 °C at a heating rate of 2 °C / min, and calcined for 5 h in an air atmosphere to obtain a cobalt-based catalyst 10Co / 20SiO 2 - 70ZSM-5 in which the cobalt content is 10% by weight of the catalyst support.

Embodiment 2

[0041] 20Co / 20SiO 2 - Preparation of 60ZSM-5 catalyst: Weigh 10.9 g of cobalt nitrate hexahydrate into 100 mL of deionized water, and ultrasonically dissolve to obtain a cobalt nitrate solution. Weigh 6g of ZSM-5 molecular sieve with a silicon-aluminum ratio of 25 and 2g of silicon oxide (pore size 10nm), add to the above cobalt nitrate solution, and stir at room temperature for 4h. Then the solvent in the above suspension was evaporated to dryness, and the evaporated solid was dried in an oven at 120° C. for 6 h. The dried solid was heated in a muffle furnace to 550 °C at a heating rate of 2 °C / min, and calcined for 5 h in an air atmosphere to obtain a cobalt-based catalyst 20Co / 20SiO 2 - 60ZSM-5 in which the cobalt content is 20% by weight of the catalyst support.

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Abstract

The invention relates to the technical field of catalytic chemistry, and provides a cobalt-base catalyst and a preparation method thereof. The preparation method comprises the following steps: adding a molecular sieve and silicon oxide into a cobalt salt solution, stirring to obtain suspension, drying up the solvent by distillation, drying in a drying oven to obtain a solid, and roasting to obtain the cobalt-base catalyst. By using the metal cobalt and molecular sieve as the active components of the catalyst, the molecular sieve has smaller pore size, and is not convenient for the dispersion of the reactant gas and product; the silicon dioxide, which is used as the dispersing agent of the catalyst, has the effect of dispersing the metal cobalt and molecular sieve, and performs the supporting function; and the added silicon dioxide avoids the phenomenon of local overheating, thereby enhancing the selectivity of the catalyst. The prepared catalyst for Fischer-Tropsch synthesis reaction has very high selectivity for C10-C16 hydrocarbon fractions, has higher isoalkane content, is suitable to be used as an aviation fuel, and can effectively lower the investment cost and operating cost of the device.

Description

technical field [0001] The invention relates to the technical field of catalytic chemistry, in particular to a cobalt-based catalyst and a preparation method thereof. Background technique [0002] Energy is the basis for the survival and development of modern society. The supply capacity of clean fuel is related to the sustainable development of the national economy and is one of the foundations of national strategic security. Fischer-Tropsch Synthesis (FTS) is the synthesis of coal, natural gas and biomass through synthesis gas (H 2 +CO) is a feasible technology for catalytic conversion of iron-based, cobalt-based and other catalysts into high-quality clean liquid fuels and high value-added chemicals that do not contain sulfur, nitrogen and aromatics. It is an effective technology to solve the increasing shortage of petroleum resources and avoid environmental pollution. way. The cobalt-based catalyst has good carbon chain growth ability, high selectivity of high-carbon li...

Claims

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Application Information

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IPC IPC(8): B01J29/46B01J29/76B01J29/68B01J29/14C10G2/00
CPCB01J29/46B01J29/146B01J29/68B01J29/7615B01J2229/20C10G2/334
Inventor 邢闯程世林申东明吕鹏冷彪汪婧妍许茂乾杨瑞芹椿范立
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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