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Acidity nanometer cobalt catalyst, preparation method and application thereof

A catalyst and nano-cobalt technology, which is applied in the field of acidic nano-cobalt catalysts, can solve problems such as increasing costs, and achieve the effects of small pore size, high activity, and large comparative area

Inactive Publication Date: 2009-08-26
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The recycling of raw gas CO and the addition of precious metals will inevitably increase the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]Use deionized water as solvent, prepare 0.1mol / L solutions of cobalt nitrate, zinc nitrate, and manganese nitrate respectively, mix according to the mass ratio Co:Zn:Mn=100:50:10, and add 0.2% surface active Fatty alcohol polyoxyethylene ether sodium sulfate, fully stirred for 3 hours; slowly drop 1mol / L sodium hydroxide solution into the stirred mixed solution, and control the pH value at about 9, continue to stir for 1 to 2 hours, and then age 18~24h. Suction filter and clean the precipitate obtained from aging until Na-free + , Cl - , NO 3 - , the resulting hydrogel was replaced 3 times with absolute ethanol, and centrifuged. Take the obtained alcohol gel and place it in a supercritical autoclave, add absolute ethanol to about 3 / 5 of the autoclave, seal it and turn on the power to heat to 262°C, keep it warm for half an hour, open the outlet valve, and slowly release the ethanol solvent , turn off the power after finishing, open the intake valve and feed nitrogen...

Embodiment 2

[0042] Use deionized water as solvent, configure 0.1mol / L cobalt sulfate, zinc nitrate, manganese nitrate solution, mix according to the mass ratio Co:Zn:Mn=100:50:15, add 0.2% surfactant while stirring Fatty alcohol polyoxyethylene ether sodium sulfate, fully stirred for 3 hours; slowly add 1mol / L sodium hydroxide solution dropwise to the stirred mixed solution, and control the pH value at around 9, continue to stir for 1-2 hours, and then age for 20 ~24h. Suction filter and clean the precipitate obtained from aging until Na-free + , Cl - , NO 3 - , SO 4 2- , the resulting hydrogel was replaced 3 times with absolute ethanol, and centrifuged. Take the obtained alcohol gel and place it in a supercritical autoclave, add absolute ethanol to about 3 / 5 of the autoclave, seal it and turn on the power to heat to 262°C, keep it warm for half an hour, open the outlet valve, and slowly release the ethanol solvent , turn off the power after finishing, open the intake valve and fee...

Embodiment 3

[0044] Embodiment 3: use deionized water as solvent, configure 0.1mol / L cobalt nitrate, zinc nitrate, manganese sulfate solution, mix by mass ratio Co: Zn: Mn=100: 50: 20, add 0.2% while stirring Diethanolamide stearic acid monoglyceride surfactant, fully stirred for 3 hours; slowly drop 1mol / L potassium hydroxide solution into the stirred mixed solution, and control the pH value at about 9, continue to stir for 1 to 2 hours , and then aged for 20-24 hours. Suction filter and clean the precipitate obtained from the aging until no K + , Cl - , NO 3 - , SO 4 2- , the resulting hydrogel was replaced 3 times with absolute ethanol, and centrifuged. Take the obtained alcohol gel and place it in a supercritical autoclave, add absolute ethanol to about 3 / 5 of the autoclave, seal it and turn on the power to heat to 262°C, keep it warm for half an hour, open the outlet valve, and slowly release the ethanol solvent , turn off the power after finishing, open the intake valve and fe...

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Abstract

The invention provides an acidity nanometer cobalt catalyst, the main active constituent of which is Co and the accessory constituents of which are Zn, Mn and trace metals; the existence form of all constituents of the catalyst is as follows: (Co, Zn)O, (CoZn2)O4, Co3O4, ZnO, MnO, K2O, Na2O, and Li2O; the catalyst is carrier free acidity nanometer cobalt catalyst which is acidized, the average grain diameter of which is 3-18nm, the specific surface is 75-400m / g, and the average pore size is 4-20nm. The preparation process of the catalyst adopts a supercritical fluid drying technique, which causes the prepared catalyst is characterized by small grain diameter, big specific surface, small pore size and high activity. The catalyst is mainly used for synthesis gas CO+H2 which is directly transformed to prepare high isomerization clean fuel, and used for Fischer-Tropsch reaction of the synthesis gas preparing liquid hydrocarbon; wherein the conversion rate of CO reaches more than 78% and the isomerization product accounts for more than 53% of the total liquid hydrocarbon product.

Description

technical field [0001] The invention relates to an acidic nano-cobalt catalyst, and also relates to a method for preparing the catalyst by supercritical fluid combination technology. The catalyst is mainly used for syngas CO+H 2 Direct conversion to high isomerization clean fuel. Background technique [0002] In the current methods of preparing clean fuels, they can be generally divided into two categories: one is the petroleum route; the other is the non-petroleum route. Since the two oil crises broke out in the 1970s, countries all over the world have been devoting themselves to the research and development of routes for synthesizing clean fuels from non-petroleum resources, and some significant progress has been made. [0003] In the 1970s, Mobil Corporation of the United States developed the MTG synthetic gasoline process after developing the ZSM-5 molecular sieve catalyst. The first stage of the method combined CO and H 2 Methanol is synthesized, and the second stage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J23/889B01J23/78C07C1/08C10L1/04
CPCY02P20/54
Inventor 张敬畅李晶淼曹维良
Owner BEIJING UNIV OF CHEM TECH
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