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Ammonium-modified silicon oxide loaded boron oxide for oxidative dehydrogenation of propane and preparation method of ammonium-modified silicon oxide loaded boron oxide

A technology for oxidative dehydrogenation and silicon oxide carrier, applied in chemical instruments and methods, physical/chemical process catalysts, organic chemistry, etc. It is convenient for large-scale production and application, good stability, and the effect of increasing solubility

Active Publication Date: 2022-07-08
INNER MONGOLIA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the traditional incipient wetness impregnation method is not convenient for large-scale production of supported boron oxide catalysts, and the active components are easily lost during the reaction process, the present invention provides a one-pot excess impregnation method for preparing ammonium-modified silicon oxide-supported boron oxide catalysts. boron catalyst method

Method used

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  • Ammonium-modified silicon oxide loaded boron oxide for oxidative dehydrogenation of propane and preparation method of ammonium-modified silicon oxide loaded boron oxide
  • Ammonium-modified silicon oxide loaded boron oxide for oxidative dehydrogenation of propane and preparation method of ammonium-modified silicon oxide loaded boron oxide
  • Ammonium-modified silicon oxide loaded boron oxide for oxidative dehydrogenation of propane and preparation method of ammonium-modified silicon oxide loaded boron oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0038] The boron oxide / ammonium modified MCM-41 catalyst described in this example (theoretical mass ratio B 2 O 3 :MCM-41=1:10) preparation process is as follows:

[0039] (1) Weigh out ammonium pentaborate ((NH 4 ) 2 B 10 O 16 ·8H 2 O) 0.16 g, dissolved in 11 mL of 2.5 mol / L ammonia solution to obtain a boron-containing solution.

[0040] (2) To the solution obtained in (1), add 1.0 g of the above-mentioned MCM-41 synthesized with ammonia water as an alkali source, rapidly stir in a 35°C water bath for 3 hours, centrifuge, and dry the solid in an oven at 80°C to obtain a catalyst precursor, and then add It was calcined in a muffle furnace at 550 °C for 2 h to obtain a boron oxide / ammonium modified MCM-41 catalyst.

[0041] B of the boron oxide / ammonium modified MCM-41 catalyst prepared in this example 2 O 3 The actual content is 7wt.%, the specific surface area is 732m 2 / g, pore volume 0.70cm 3 / g, the wide-angle XRD pattern is as follows figure 1 As shown, the ...

Embodiment 1-2

[0043] The boron oxide / ammonium modified MCM-41 catalyst described in this example (theoretical mass ratio B 2 O 3 :MCM-41=2:10) preparation process is as follows:

[0044] (1) Weigh out ammonium pentaborate ((NH 4 ) 2 B 10 O 16 ·8H 2 O) 0.31 g, dissolved in 11 mL of 2.5 mol / L ammonia solution to obtain a boron-containing solution.

[0045] (2) To the solution obtained in (1), add 1.0 g of the above-mentioned MCM-41 synthesized with ammonia water as an alkali source, rapidly stir in a 35°C water bath for 3 hours, centrifuge, and dry the solid in an oven at 80°C to obtain a catalyst precursor, and then add It was calcined in a muffle furnace at 550 °C for 2 h to obtain a boron oxide / ammonium modified MCM-41 catalyst.

[0046] B of the boron oxide / ammonium modified MCM-41 catalyst prepared in this example 2 O 3 The actual content is 13wt.%, and the specific surface area is 565m 2 / g, pore volume 0.60cm 3 / g, the wide-angle XRD pattern is as follows figure 1 shown.

Embodiment 1-3

[0048] The boron oxide / ammonium modified MCM-41 catalyst described in this example (theoretical mass ratio B 2 O 3 :MCM-41=3:10) preparation process is as follows:

[0049] (1) Weigh out ammonium pentaborate ((NH 4 ) 2 B 10 O 16 ·8H 2 O) 0.47 g, dissolved in 11 mL of 2.5 mol / L ammonia solution to obtain a boron-containing solution.

[0050] (2) To the solution obtained in (1), add 1.0 g of the above-mentioned MCM-41 synthesized with ammonia water as an alkali source, rapidly stir in a 35°C water bath for 3 hours, centrifuge, and dry the solid in an oven at 80°C to obtain a catalyst precursor, and then add It was calcined in a muffle furnace at 550 °C for 2 h to obtain a boron oxide / ammonium modified MCM-41 catalyst.

[0051] B of the boron oxide / ammonium modified MCM-41 catalyst prepared in this example 2 O 3 The actual content is 14wt.%, the specific surface area is 550m 2 / g, pore volume 0.54cm 3 / g, the wide-angle XRD pattern is as follows figure 1 As shown, the...

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Abstract

The invention provides ammonium modified silicon oxide loaded boron oxide for propane oxidative dehydrogenation and a preparation method thereof. The preparation method comprises the following steps: dissolving a boron compound in an ammonia water solution to obtain a boron-containing impregnation liquid; uniformly mixing and stirring the obtained solution and a silicon oxide carrier, centrifugally separating, drying, and roasting in an air atmosphere in a muffle furnace to obtain the ammonium-modified silicon oxide-loaded boron oxide catalyst. According to the method, ammonium modification of the carrier and high loading capacity of boron oxide can be simultaneously realized through one-time impregnation, the preparation process is simple and easy to control, the used ammonia water solution can be recycled for multiple times, and large-scale production and application are facilitated; the content of boron oxide in the obtained catalyst is 7-25 wt.%, and the catalyst has excellent propane oxidative dehydrogenation low-temperature catalytic activity and olefin selectivity, has good loss resistance in the reaction process of loading boron oxide, and has wide industrial development and application prospects.

Description

technical field [0001] The invention belongs to the field of chemical industrial catalysis, and relates to a method for preparing ammonium-modified silicon oxide-supported boron oxide by a one-pot excess impregnation method and its application in the reaction of preparing propylene by oxidative dehydrogenation of propane. Background technique [0002] Propylene is an important petrochemical basic raw material, and the global annual demand exceeds 100 million tons. In recent years, due to the continuous increase in demand for propylene downstream products (such as high melt index polypropylene fiber material used in the production of medical protective equipment), the global annual demand for propylene has increased year by year, and the propylene supply gap has expanded. At present, the main production routes of propylene are: naphtha steam cracking by-products, oil refining by-products, coal / methanol conversion, direct dehydrogenation of propane, etc. In recent years, with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/04B01J35/10C07C5/333C07C11/06
CPCB01J29/041C07C5/333C07C2529/04B01J2229/186B01J35/617B01J35/633B01J35/635B01J35/615C07C11/06Y02P20/584Y02P20/52
Inventor 王奖徐爱菊刘青颖贾美林
Owner INNER MONGOLIA NORMAL UNIVERSITY
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