Alkane dehydrogenation catalyst and preparation method thereof

A dehydrogenation catalyst, catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of low propane conversion rate, shortened catalyst life, etc., To achieve the effect of simple preparation method, inhibiting carbon deposition and improving activity stability

Active Publication Date: 2015-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Industrial application of the PDH method is limited due to low propane conversion and shortened catalyst life under harsh reaction conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] Weigh commercially available alumina carrier (spherical, diameter 0.5mm, pore volume 0.71cm3 / g, specific surface area 224m 2 / g, the carrier used in the following examples) 30g, deionized water was added dropwise to initial moistening, and the volume of consumed water was 27mL. Assuming that the Sn content accounted for 3wt% of the final catalyst, tin tetrachloride containing 0.9g of Sn was weighed and dissolved in deionized water, and the volume was adjusted to 27mL. Add the prepared Sn-containing solution into 30g of alumina carrier, mix well, and age for 2h. Dry at 80°C for 8 hours, then bake at 600°C for 4 hours. After roasting, the sample is placed in a rotary evaporator for vacuum treatment at a temperature of 70°C, and the vacuum degree is controlled below 10kPa. After 1 hour of treatment, the temperature is lowered, and 100mL of methanol is added to return to normal pressure, heated to reflux, the heating temperature is 55°C, and the treatment time is 4 hours. ...

example 2

[0019] The ethanol-treated catalyst was prepared according to the process described in Example 1, and the content of each component in the catalyst obtained at a reflux temperature of 70°C was: Pt 0.6 wt%, Sn 3.0 wt%, Na 1.0 wt%. The resulting catalyst is designated C-2.

example 3

[0021] According to the process described in Example 1, the catalyst was treated with methanol and ethanol mixed solvent. The molar ratio of methanol and ethanol was 1:3, and the reflux temperature was 66°C. The content of each component in the prepared catalyst was: Pt 0.6wt%, Sn3. 0 wt%, Na 1.0 wt%. The resulting catalyst is designated C-3.

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PUM

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Abstract

The invention discloses a preparation method of a dehydrogenation catalyst. The method comprises the following steps: loading Sn by adopting an immersion process with alumina as a carrier; drying, roasting, and carrying out surface modification on the Sn supported alumina carrier by using an alcohol solvent; drying the modified Sn-containing alumina carrier, and loading an active component Pt by adopting the immersion process; and loading alkali metal Na. The catalyst prepared through the method can promote Pt-Sn interaction, so the selectivity of a target product propylene is improved, and the active stability of the catalyst is also improved.

Description

technical field [0001] The invention relates to an alkane dehydrogenation catalyst and a preparation method thereof, in particular to a propane dehydrogenation propylene catalyst and a preparation method thereof. Background technique [0002] The development of shale gas in North America has led to a sharp decline in natural gas prices relative to crude oil prices, while the production of large condensate liquids (NGLs) in shale gas has also increased rapidly. Shale gas condensate is rich in low-carbon alkanes such as ethane, propane, and butane. Ethane can be used as a cracking raw material to produce ethylene. Therefore, FCC technology alone cannot meet the rapidly growing demand for propylene. Dehydrogenation of low-carbon alkanes in natural gas (conventional natural gas, shale gas, coalbed methane, combustible ice, etc.) to produce low-carbon olefins is an effective way to solve this problem. Moreover, with the increasing scarcity of petroleum resources, the production ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/62C07C5/333C07C11/06
CPCY02P20/52
Inventor 张海娟李江红王振宇乔凯
Owner CHINA PETROLEUM & CHEM CORP
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