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Preparation method and application of single-site Co (II) catalyst

A single-site, catalyst technology, used in catalyst activation/preparation, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of high preparation cost and complex process.

Active Publication Date: 2021-05-18
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the current problem of complex procedures and high preparation costs for obtaining single-site divalent cobalt, the present invention provides a simple preparation method for single-site Co(II) catalysts, and obtains single-site Co(II) catalysts by direct reduction after drying. , used for alkane dehydrogenation to olefins, under the same reaction conditions, compared with the catalyst prepared by the common impregnation and calcination method, a higher conversion rate was obtained. It can be seen from the characterization that this method also obtained a single-site Co(II) catalyst

Method used

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  • Preparation method and application of single-site Co (II) catalyst
  • Preparation method and application of single-site Co (II) catalyst
  • Preparation method and application of single-site Co (II) catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: Preparation of 2g 2%Co-SBA15 catalyst

[0024] (1) Weigh 0.2016g of cobalt nitrate into a 100mL crucible, add 8mL of deionized water, stir and mix evenly, add 2g of SBA15, stir vigorously for 10min, ultrasonic for 10min, impregnate for 12h, and dry at 110°C for 10h; press the material, Pulverize and sieve to obtain 40-60 mesh materials, put the materials into a fixed-bed reactor, and feed them with a volume percentage of 10% H 2 argon, 30mL / min, the temperature was raised to 600°C at 10°C / min, and kept for 2h to prepare a single-site Co(II) catalyst;

[0025] At the same time, the catalyst was prepared by the ordinary impregnated air calcination method as a comparison, specifically weighed 0.2016g of cobalt nitrate in a 100mL crucible, added 8mL of deionized water, stirred and mixed evenly, added 2g of SBA15, stirred vigorously for 10min, ultrasonicated for 10min, and impregnated for 12h , dried at 110°C for 10h; calcined at 600°C for 300min in a muffle f...

Embodiment 2

[0029] Embodiment 2: Preparation of 2g 4% Co-SBA15 catalyst

[0030] (1) Weigh 0.4117g of cobalt nitrate into a 100mL crucible, add 8mL of deionized water, stir and mix evenly, add 2g of SBA-15, stir vigorously for 10min, ultrasonic for 10min, impregnate for 12h, and dry at 110°C for 12h; press the material flakes, crushed and sieved to obtain 40-60 mesh materials, the materials were loaded into a fixed-bed reactor, and passed through 9% H by volume 2 argon, 35mL / min, the temperature was raised to 600°C at 12°C / min, and kept for 2h to prepare a single-site Co(II) catalyst;

[0031] At the same time, the catalyst was prepared by the ordinary impregnation air calcination method as a comparison. Specifically, 0.4117g of cobalt nitrate was weighed in a 100mL crucible, 8mL of deionized water was added, and after mixing evenly, 2g of SBA15 was added, vigorously stirred for 10min, ultrasonicated for 10min, and impregnated for 12h. , dried at 110°C for 12h; calcined in a muffle furna...

Embodiment 3

[0035] Embodiment 3: prepare 2g 6%-SBA15 catalyst

[0036] (1) Weigh 0.6307g of cobalt nitrate into a 100mL crucible, add 8mL of deionized water, stir and mix evenly, add 2g of SBA-15, stir vigorously for 10min, sonicate for 10min, impregnate for 12h, and dry at 110°C for 15h; press the material flakes, pulverized and sieved to obtain 40-60 mesh materials, the materials were loaded into a fixed-bed reactor, and 12% H by volume was passed through 2 argon, 30mL / min, the temperature was raised to 600°C at 9°C / min, and kept for 2h to prepare a single-site Co(II) catalyst;

[0037]At the same time, the catalyst was prepared by the ordinary impregnated air calcination method as a control. Specifically, 0.6307g of cobalt nitrate was weighed into a 100mL crucible, and 8mL of deionized water was added. After mixing evenly, 2g of SBA15 was added, vigorously stirred for 10min, ultrasonicated for 10min, and impregnated for 12h. , dried at 110°C for 15h; calcined at 600°C for 300min in a ...

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Abstract

The invention discloses a preparation method of a single-site Co (II) catalyst, which comprises the following steps of: dipping a pure silicon carrier into a cobalt salt solution by an equivalent-volume dipping method, uniformly mixing, dipping for 10-15 hours, drying, tabletting, crushing and sieving to obtain 40-60-mesh particles, putting the particles into a fixed bed reactor, introducing argon containing 8-12% of H2, heating to 550-650 DEG C, reacting for 1.5-2.5 hours, and preparing the single-site Co (II) catalyst, wherein the content of Co in the single-point Co (II) catalyst is 2%-6%; according to the method, through direct reduction, the problem that the alkane dehydrogenation efficiency is not high due to the fact that cobalt oxide is easily generated in traditional muffle furnace roasting is solved; compared with a traditional strong electrostatic adsorption method, the preparation process is simple, time consumption is low, cost is low, and under the same reaction condition, compared with a catalyst prepared through a common dipping and calcining method, the conversion rate is high; and the method opens up a new way for obtaining a single-site metal catalyst.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a preparation method of a single-site Co(II) catalyst and its application in alkane dehydrogenation to propylene. Background technique [0002] Ethylene and propylene are raw materials for the petrochemical industry and are used to produce a variety of chemicals such as polymers, oxygenates and important chemical intermediates. In recent years, with the development of the market economy, the demand for downstream products of ethylene and propylene has risen rapidly, which has greatly promoted the global demand for olefins. The traditional methods of steam cracking and naphtha catalytic cracking to obtain olefins are far from meeting the demand for olefins in my country. Therefore, the production of olefins from other sources has become increasingly important, and these sources mainly include alkane dehydrogenation. Dehydrogenation of alkanes to olefins can not only reduce cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03B01J29/04B01J37/02B01J37/18C07C5/333C07C11/06
CPCB01J29/0333B01J29/044B01J37/0201B01J37/18C07C5/3335B01J2229/186C07C11/06Y02P20/52
Inventor 罗永明黄子君何德东陆继长邓维华
Owner KUNMING UNIV OF SCI & TECH