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Iron-based catalyst and preparation method thereof

A technology of iron-based catalysts and iron salts, applied in the field of catalytic chemistry, can solve problems such as restricting wide application, high production costs, and complicated processes

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

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Problems solved by technology

However, due to the complex process and high production cost of this process, the wide application of co

Method used

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  • Iron-based catalyst and preparation method thereof
  • Iron-based catalyst and preparation method thereof

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preparation example Construction

[0028] Correspondingly, the present invention also provides a method for preparing an iron-based catalyst, comprising the following steps: adding molecular sieves and silicon oxide to the iron 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 an iron-based catalyst.

[0029] As a preferred version, the iron salt solution is preferably an aqueous solution or an alcohol solution of an iron salt, and the solvent in the iron 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 iron, the iron salt in the iron salt solution is selected from one or more of ferric chloride, iron nitrate, and iron acetate; the mass concentration of the iron salt solution is 10%-40% . In the step of ob...

Embodiment 1

[0040] 10Fe / 20SiO 2 Preparation of -70ZSM-35 catalyst:

[0041] Weigh 8.04 g of ferric nitrate nonahydrate, add it into 50 mL of deionized water, and ultrasonically dissolve to obtain ferric nitrate solution. Weigh 7.78g of ZSM-35 molecular sieve with a silicon-aluminum ratio of 15 and 2.22g of silicon dioxide (pore size 10nm), add to the above ferric 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 the iron-based catalyst 10Fe / 20SiO 2 - 70ZSM-35 in which the iron content is 10% by weight of the catalyst support.

Embodiment 2

[0043] 10Fe / 20SiO 2 Preparation of -70ZSM-5 catalyst:

[0044] Weigh 8.04 g of ferric nitrate nonahydrate, add it into 50 mL of deionized water, and ultrasonically dissolve to obtain ferric nitrate solution. Weigh 7.78g of ZSM-5 molecular sieve with a silicon-aluminum ratio of 25 and 2.22g of silicon dioxide (pore size 10nm), add to the above ferric 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 the iron-based catalyst 10Fe / 20SiO 2 - 70ZSM-5 in which the iron content is 10% by weight of the catalyst support.

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Abstract

The invention relates to the technical field of catalytic chemistry and provides an iron-based catalyst and a preparation method thereof. The preparation method comprises the following steps of: adding a molecular sieve and silicon oxide into an iron salt solution, and stirring the mixture to obtain a turbid solution; evaporating a solvent to dryness; then drying the mixture in an oven to obtain a solid; and roasting the solid to obtain the iron-based catalyst. According to the iron-based catalyst provided by the invention, by taking a metal iron and the molecular sieve as active ingredients of the catalyst, the pore diameter of the molecular sieve is relatively small, so that diffusion of reaction gas and products is not facilitated; silicon dioxide as a dispersant of the catalyst plays a role of dispersing the metal iron and the molecular sieve, and meanwhile has a supporting effect; and by adding silicon dioxide, a local overheating phenomenon is avoided, and the selectivity of the catalyst is improved. The catalyst prepared by the preparation method for Fischer-Tropsch synthesis reaction is very high in selectivity of hydrocarbon fraction, the number of carbon atoms of which is 10-16, and the content of isoparaffin is increased. The catalyst is suitable for being used as aviation fuel, so that the investment cost and operating cost of the device can be effectively lowered.

Description

technical field [0001] The invention relates to the technical field of catalytic chemistry, in particular to an iron-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. Iron-based catalysts are the most common catalysts in Fischer-Tropsch synthesis, with low price, wi...

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 邢闯申东明程世林吕鹏冷彪许茂乾杨瑞芹椿范立
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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