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High-performance catalyst for preparing olefin through dehydrogenation of light alkane and preparation method thereof

A technology of low-carbon alkanes and catalysts, which is applied in the field of catalysts and their preparations for the dehydrogenation of low-carbon alkanes to produce corresponding olefins. It can solve the problems of complex operation steps and achieve high alkane conversion rate, selectivity and good stability.

Active Publication Date: 2013-07-24
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method of co-impregnation of platinum, tin and lithium uses sulfide to carry out wet presulfurization after calcination to introduce sulfur components, and the catalyst selectivity is improved, but the operation steps are complicated

Method used

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  • High-performance catalyst for preparing olefin through dehydrogenation of light alkane and preparation method thereof
  • High-performance catalyst for preparing olefin through dehydrogenation of light alkane and preparation method thereof
  • High-performance catalyst for preparing olefin through dehydrogenation of light alkane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Catalyst-A: Catalyst-A contains 0.35w%Pt, 0.7w%Sn, 1w%K 2 O, supported on a zirconium-containing high-temperature composite oxide carrier (zirconia content 1.1w%), the preparation method is as follows:

[0034] Weigh ZrOCl 2 ·8H 2 2.88g of O powder was dissolved to obtain 134ml of zirconium oxychloride solution, and 123.7g of pseudo-boehmite was weighed, and an equal-volume impregnation method (the volume of the impregnation solution was equal to the saturated water absorption of pseudo-boehmite pellets) was used to prepare pseudo-boehmite The diaspore pellets were impregnated. Place the impregnated pellets at room temperature for aging in an air atmosphere for 12 hours, then place them in a constant temperature drying oven at 180°C for 8 hours, and place the dried samples in a temperature-programmed furnace to heat them in an air atmosphere at a rate of 5°C / min. After the temperature rises to 850°C, keep the temperature for 5 hours. After cooling, take out the roas...

Embodiment 2

[0038] Catalyst-A is used for dehydrogenation of isobutane: the above-mentioned catalyst-A is used for the reaction of isobutane dehydrogenation to isobutene, the reaction temperature is 540°C, n (isobutane) in the material: n (H 2 ): n (H 2 O)=1:0.5:1.5, the gas space velocity (GHSV) under the standard state is 20000h -1 . The result of dehydrogenation of gained isobutane to generate isobutene is shown in Table 1.

[0039] Table 1: Results of dehydrogenation of isobutane to isobutene over Catalyst-A

[0040]

[0041] As can be seen from Table 1, at up to 20000h -1 Catalyst-A exhibited good isobutane dehydrogenation activity and isobutene selectivity at a space velocity of .

Embodiment 3

[0043] Catalyst-A is used for the dehydrogenation reaction of propane: the above-mentioned catalyst-A is used for the reaction of propane dehydrogenation to propylene, the reaction temperature is 570°C, n (propane) in the material: n (H 2 ): n (H 2 O)=1:0.2:1, GHSV is 7000h -1 . The results of the dehydrogenation of propane to propylene are shown in Table 2.

[0044] Table 2: Results of Propane Dehydrogenation to Propylene on Catalyst-A

[0045]

[0046] As can be seen from Table 2, at up to 7000h -1 Catalyst-A exhibited good propane dehydrogenation activity and propylene selectivity at a space velocity of .

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Abstract

The invention discloses a high-performance catalyst for preparing olefin through dehydrogenation of light alkane and a preparation method thereof. The preparation method comprises the following steps of: steeping active components by adopting a steeping method of forming a stable complexing solution under the existence of an inorganic and / or organic acid, drying, burning, carrying out hydrogen reduction and activating to obtain the high-performance catalyst by taking high-temperature composite oxide containing one or mixture of multiple of aluminium oxide, magnesium oxide, zirconium oxide and zinc oxide as a carrier, one or multiple of metals such as ruthenium, rhodium, platinum and iridium as a main active component, one or multiple of metals such as germanium, tin or lead as a first additive, and one or multiple of alkali metals such as lithium, sodium, potassium, rubidium, cesium or francium as a second additive. Test results for light alkane dehydrogenation show that the catalyst has high catalytic activity, selectivity and stability.

Description

technical field [0001] The invention relates to a technology for producing corresponding olefins by dehydrogenating low-carbon alkanes, in particular to a catalyst for producing corresponding olefins by dehydrogenating low-carbon alkanes and a preparation method thereof. Background technique [0002] Olefins such as propylene, butene and isobutene are an important class of chemical raw materials and are widely used in the chemical industry. The main sources of the above olefins are catalytic cracking dry gas or steam cracking processes. In addition, the dehydrogenation of alkanes is also an important method for the preparation of the above-mentioned alkenes. It can convert alkanes with lower application value into alkenes with higher value. [0003] The commonly used dehydrogenation processes reported in the literature are mainly Catofin process of Lummus, Oleflex process of UOP, STAR process of PHILIPPS, PDH process of Linde and PBD process of Snamprogetti. The alkane de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/62C07C5/333C07C11/06C07C11/09C07C11/08
CPCY02P20/52
Inventor 王际东徐艳峰吴同旭屈一新宋金富
Owner BEIJING UNIV OF CHEM TECH
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