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Cobalt-based composite oxide catalyst and its preparation method and application

A technology of composite oxides and catalysts, applied in the direction of metal/metal oxide/metal hydroxide catalysts, preparation of liquid hydrocarbon mixtures, physical/chemical process catalysts, etc. and structural differences, to achieve a simple and controllable preparation method

Inactive Publication Date: 2017-04-12
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention patent application with the application number 201310617058.6 discloses a micro-mesoporous pillared montmorillonite-supported cobalt catalyst to control the distribution of Fischer-Tropsch synthesis products. The catalyst can obtain C with high selectivity. 20 + Hydrocarbon products, but due to the different origins of montmorillonite, its composition and structure are quite different, which has a great impact on the catalytic performance of the catalyst

Method used

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  • Cobalt-based composite oxide catalyst and its preparation method and application

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Experimental program
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Embodiment 1

[0014] Dissolve 1.3g of cerium nitrate hexahydrate and 7.4g of cobalt nitrate hexahydrate in 60mL of ethanol, add 27.7g of ethyl orthosilicate under stirring conditions, and mix well; then 47.9g of dodecane with a mass fraction of 10% An aqueous solution of dipolyoxyethylene ammonium bromide (molecular weight: 1076) was slowly added dropwise to the resulting mixture, and stirring was continued for 2 hours to obtain a sol. The obtained sol was heated to 70° C. for 3 hours, and then dried in an oven at 85° C. for 12 hours to obtain a gel. Put the gel in a muffle furnace, raise the temperature to 500°C at a rate of 2°C / min, bake in the air atmosphere for 5 hours, cool naturally to room temperature, take it out, press into tablets, granulate, pass through a 40-60 mesh sieve, Prepare a cobalt-based composite oxide catalyst with a specific surface area of ​​260.5m 2 g -1 , the pore volume is 1.9cm 3 g -1 , The average pore diameter is 35.1nm, the mass percentage of metal Co in t...

Embodiment 2

[0016] In embodiment 1, the didodecyl double polyoxyethylene ammonium bromide that the molecular weight used is 1076 is replaced by the ditetradecyl double polyoxyethylene ammonium bromide that the equimolar molecular weight is 1132, and other steps are the same as Embodiment 1 is identical, is prepared into cobalt-based composite oxide catalyst, and its specific surface area is 275.4m 2 g -1 , the pore volume is 2.1cm 3 g -1 , The average pore diameter is 38.1nm.

Embodiment 3

[0018] In embodiment 1, the double hexadecyl double polyoxyethylene ammonium bromide that the average molecular weight used is 1076 is replaced by the dihexadecyl double polyoxyethylene ammonium bromide that equimolar molecular weight is 1188, other steps Same as Example 1, prepare a cobalt-based composite oxide catalyst with a specific surface area of ​​256.3m 2 g -1 , the pore volume is 1.7cm 3 g -1 , The average pore diameter is 37.5nm.

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Abstract

The invention discloses a cobalt-based composite oxide catalyst and its preparation method and application. The catalyst uses a polyoxyethylene group-containing quaternary ammonium salt cationic surfactant with a unique structure as a structural guide agent, and cobalt nitrate, nitric acid Cerium and ethyl orthosilicate are used as precursors, and are prepared by a one-step method. The preparation method is simple and controllable. The resulting catalyst has a mesoporous structure, a large specific surface area, and high metal dispersion. It can be used in Fischer-Tropsch synthesis reactions with high Selectively obtain C19+ hydrocarbon products.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a catalyst for Fischer-Tropsch synthesis reaction. Background technique [0002] In recent years, with the rapid development of the national economy, the consumption of lubricating oil has grown rapidly, the supply is tight, and the dependence on imports has increased year by year. Among them, lubricating oil base oil is the main body of lubricating oil, accounting for as high as 70% to 99% of lubricating oil. Therefore, the quality of the base oil directly affects the product quality and performance of the lubricating oil. At this stage, my country's lubricating oil base oils are mainly based on petroleum, and the vacuum distillation fractions of refineries are used as raw materials to produce lubricating oil base oils through technologies such as hydrofining, dewaxing, and supplementary refining. However, due to the large amount of olefins, cycloalkanes, aromati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83C10G2/00
Inventor 郝青青赵东阳马晓迅
Owner NORTHWEST UNIV