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A catalyst for dehydrogenating low-carbon alkanes to olefins and its preparation method and application

A low-carbon alkane and catalyst technology, which is applied in the field of low-carbon alkane dehydrogenation to olefin catalyst and its preparation field, can solve problems such as rapid coking, and achieve the effects of improving dispersity, high dehydrogenation activity, and high olefin selectivity

Active Publication Date: 2019-03-05
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The catalyst usually used for the dehydrogenation of low-carbon alkanes is alumina-supported chromium oxide catalyst. This catalyst has the advantages of high activity and low cost, but the catalyst will quickly coke during the dehydrogenation reaction. Therefore, frequent cycles of high temperature are required. Regeneration, due to frequent regeneration, the catalyst is required to have good hydrothermal stability to avoid frequent regeneration and replacement of the catalyst

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  • A catalyst for dehydrogenating low-carbon alkanes to olefins and its preparation method and application
  • A catalyst for dehydrogenating low-carbon alkanes to olefins and its preparation method and application
  • A catalyst for dehydrogenating low-carbon alkanes to olefins and its preparation method and application

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Embodiment 1

[0056] This embodiment provides a method for preparing a catalyst for dehydrogenating low-carbon alkanes to olefins, wherein the method includes the following steps:

[0057] 1. Preparation of alumina carrier:

[0058] Weigh 100g of macroporous pseudoboehmite powder produced by Shandong Aluminum Co., Ltd., add 2g of safflower powder, mix evenly, add dropwise 70mL of 1.5% nitric acid aqueous solution, fully knead, and extrude into a 1.6mm cylinder on the extruder The strips were dried in an oven at 120°C for 24 hours, and then fired in a muffle furnace at 800°C for 5 hours to obtain an alumina carrier.

[0059] 2. Preparation of barium-containing alumina carrier:

[0060] Take 100 g of the prepared alumina carrier, immerse in 200 mL of barium nitrate (the mass is respectively 1.94 g, 3.96 g, 6.05 g) aqueous solution (containing barium respectively 1%, 3%, 5%), and immerse for 2 hours Finally, take out the carrier, drain the solution, dry it in an oven at 120°C for 4 hours, an...

Embodiment 2

[0069] This embodiment provides a method for preparing a catalyst for dehydrogenating low-carbon alkanes to olefins, wherein the method includes the following steps:

[0070] Take 100 g of the barium-containing alumina carrier C prepared in step 2 of Example 1, impregnate it with 70 mL of chromic acid-sodium nitrate aqueous solution (with a Cr content of 12% and a Na content of 2%) with a pH value of 4, take it out after 2 hours, and let it dry in the air. After drying, it was dried in an oven at 120°C for 4 hours, and baked in a muffle furnace at 550°C for 4 hours to obtain a low-carbon alkane dehydrogenation olefins catalyst F (116.25g, in the shape of three lobes);

[0071] Based on the total weight of the low-carbon alkane dehydrogenation to olefins catalyst F as 100%, the low-carbon alkane dehydrogenation to olefins catalyst F prepared in Example 2 contains 4.8wt% barium oxide, 80.5wt% aluminum oxide, 13.2 wt% chromium oxide, 1.5wt% sodium oxide;

[0072] The low-carbon ...

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Abstract

The invention provides a low-carbon alkane dehydrogenation to olefins catalyst and its preparation method and application. The catalyst uses barium-containing alumina as a carrier, chromium oxide as the main active component, and alkali metal oxide as the co-active component; based on the total weight of the barium-containing alumina carrier being 100%, the The content of chromium oxide is 1-40wt%; the content of the alkali metal oxide is 0.01-5.0wt%; the alkali metal oxide includes one or a combination of several of lithium oxide, sodium oxide and potassium oxide. The invention also provides a preparation method of the above catalyst and its application in dehydrogenating low-carbon alkanes to produce olefins. The low-carbon alkane dehydrogenation to olefins catalyst provided by the invention has higher dehydrogenation activity, higher alkane conversion rate, higher olefin selectivity and higher olefin yield.

Description

technical field [0001] The invention relates to a low-carbon alkane dehydrogenation olefin catalyst, a preparation method and application thereof, and relates to the technical field of petrochemical catalysts. Background technique [0002] Low-carbon olefins, such as propylene and isobutene, can be produced by low-carbon alkane dehydrogenation technology. The catalysts for the production of olefins from low-carbon alkane dehydrogenation are mainly divided into two categories, chromium-based catalysts and platinum-group noble metal catalysts. [0003] Catalysts with platinum as the main active component have advantages such as good stability, but they are expensive, and their activity and selectivity need to be further improved. [0004] Chromium-based catalysts for alkane dehydrogenation are usually obtained by loading chromium on porous inorganic supports (CN102962054). In order to increase the selectivity of the catalyst and improve the service life of the catalyst, in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J23/02B01J23/26C07C5/333C07C11/09
CPCC07C5/3332B01J23/002B01J23/02B01J23/26C07C2523/26C07C2523/02B01J2523/00B01J35/615B01J35/635B01J35/647B01J2523/11B01J2523/25B01J2523/31B01J2523/67B01J2523/12C07C11/09
Inventor 周广林周红军樊彤彤李芹
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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