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Catalyst for preparing isobutene through isobutane dehydrogenation and preparation method thereof

A catalyst, isobutane technology, applied in the direction of catalyst carrier, chemical instrument and method, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of vanadium catalyst is not ideal, the distribution is not uniform enough, etc., to improve the surface Effects of acid-base and electronic properties, improved conversion and selectivity, improved pore structure and surface properties

Inactive Publication Date: 2016-03-30
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carrier prepared by this method, the distribution of silicon on the surface of the alumina macroscopic particles is not uniform enough, so it is not ideal for the preparation of vanadium catalysts for catalytic isobutane dehydrogenation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Weigh 134.3g of pseudo-boehmite, add 1500mL of deionized water to beating for 20 minutes, then add 11.5mL of concentrated hydrochloric acid (37wt%) to continue beating for 40 minutes.

[0023] (2) After adding 1.8g TEOS and stirring evenly, adjust to pH=9 with ammonia water. Place the material in a hydrothermal kettle and place it in a 95°C oven at a constant temperature for 6 hours. Then it is filtered, dried, placed in a muffle furnace, heated to 550°C at a rate of 2°C / min, and kept at a constant temperature for 6 hours.

[0024] (3) Weigh 6.89g of ammonium metavanadate, 14g of oxalic acid and 0.26g of potassium nitrate, add 83mL of deionized water, stir to dissolve and mix thoroughly with the carrier prepared in step (1), and place it in an oven at 90°C. Dry for 3 hours, place in a muffle furnace, heat up to 550°C at a rate of 2°C / min, and keep the temperature constant for 6 hours. The obtained catalyst is crushed and sieved after being compressed, and particles C1 ...

Embodiment 2

[0026] (1) Weigh 127.7g pseudo-boehmite, add 1500mL deionized water for 20 minutes, add 14.6mL concentrated hydrochloric acid (37wt%) and continue to beat for 40 minutes.

[0027] (2) After adding 3.47g TEOS and stirring evenly, adjust to pH=10 with ammonia water. Place the material in a hydrothermal kettle and place it in a 96°C oven at a constant temperature for 12 hours. Then it is filtered, dried, placed in a muffle furnace, heated to 550°C at a rate of 2°C / min, and kept constant for 3 hours.

[0028] (3) Weigh 11.48g of ammonium metavanadate, 22g of oxalic acid and 2.95g of calcium nitrate, add 78mL of deionized water, stir to dissolve, mix well with the carrier prepared in step (1), and place it in an oven at 90°C. Dry for 3 hours, place in a muffle furnace, heat up to 550°C at a rate of 2°C / min, and keep the temperature constant for 6 hours. The obtained catalyst is crushed and sieved after being compressed, and particles C2 of 20-30 mesh are taken for testing.

Embodiment 3

[0030] (1) Weigh 116.9 g of pseudo-boehmite, add 1300 mL of deionized water to beating for 20 minutes, then add 10.0 mL of concentrated hydrochloric acid (37 wt%) to continue beating for 20 minutes.

[0031] (2) Add 11.76g of silica sol solution (34wt%) and stir evenly, then adjust to pH=11 with ammonia. Place the material in a hydrothermal kettle and place it in an oven at 97°C for 24 hours. Then it is filtered, dried, placed in a muffle furnace, heated to 550°C at a rate of 2°C / min, and kept at a constant temperature for 9 hours.

[0032] (3) Weigh 16.07g of ammonium metavanadate, 22g of oxalic acid and 10.55g of magnesium nitrate, add 72mL of deionized water, stir to dissolve and mix well with the carrier prepared in step (1), and place it in an oven at 90°C. Dry for 3 hours, place in a muffle furnace, heat up to 550°C at a rate of 2°C / min, and keep the temperature constant for 9 hours. The obtained catalyst is crushed and sieved after being compressed, and particles C3 of 20-...

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Abstract

The invention belongs to the technical field of chemical catalysts and relates to a catalyst for preparing isobutene through isobutane dehydrogenation and a preparation method thereof. 0.5-10.0% by mass of silicon oxide is added into an alumina carrier, then the alumina carrier is loaded with vanadium oxide with a vanadium content of 3.0-11.0% by mass and then 0.1-5.0% by mass of an alkali metal or an alkaline earth metal as a cocatalyst is added into the alumina carrier. Silicon oxide is introduced into the alumina carrier so that an alumina carrier pore structure and surface properties are improved and vanadium oxide active site distribution is changed. Through use of an alkali metal and an alkaline earth metal, catalyst surface pH and electron properties are improved, a conversion rate and selectivity of isobutane dehydrogenation preparation of isobutene are improved and a catalyst service life is prolonged.

Description

Technical field [0001] The invention belongs to the technical field of chemical catalysts, and specifically relates to a catalyst used for isobutane dehydrogenation to prepare isobutene and a preparation method thereof. Background technique [0002] Isobutylene is an important chemical raw material. The demand for isobutylene in domestic and foreign markets is huge, and it is increasing year by year. Traditional isobutene production is mainly extracted from the by-product C4 fraction of petroleum catalytic cracking unit and naphtha catalytic cracking unit. In these methods, isobutene is produced as a by-product, and the output is limited by the scale of the main reaction and the yield of C4 olefins. my country is rich in liquefied gas resources, of which isobutane is a main component, most of which is consumed as a civil fuel and cannot be used reasonably. Therefore, using isobutane as a raw material to prepare isobutene through dehydrogenation reaction has inherent advantages a...

Claims

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Application Information

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IPC IPC(8): B01J23/22B01J32/00B01J35/10B01J21/12C07C5/333C07C11/09
CPCC07C5/333B01J21/12B01J23/22B01J35/613B01J35/615B01J35/635B01J35/633B01J35/647C07C11/09
Inventor 徐华龙张林沈伟秦枫
Owner FUDAN UNIV
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