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A kind of preparation method of low carbon alkane dehydrogenation catalyst

A catalyst and propane dehydrogenation technology, applied in the direction of hydrocarbons, hydrocarbons, chemical instruments and methods, etc., can solve the problems of carrier specific surface area, pore structure destruction, weakening PtSn interaction, Pt particle aggregation and growth, etc. Achieve the effects of simple preparation method, avoid damage, and be beneficial to industrial production

Inactive Publication Date: 2017-01-25
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-temperature water vapor dechlorination will cause damage to the specific surface area and pore structure of the carrier, weaken the PtSn interaction, and eventually lead to the aggregation and growth of Pt particles, reducing the propane conversion rate.

Method used

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  • A kind of preparation method of low carbon alkane dehydrogenation catalyst

Examples

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example 1

[0014] Weigh the alumina carrier (spherical, diameter 1mm, pore volume 0.73cm) containing a certain amount of Sn 3 / g, specific surface area 232m 2 / g, the following examples all use the carrier) 30g, deionized water is added dropwise to the initial moisture, the volume of consumed water is 27mL. Weigh a certain amount of potassium nitrate and dissolve it in deionized water, dilute it to 27mL, add it to 30g of Sn-containing alumina sample, age for 4h, dry at 80℃ for 8h, and roast at 600℃ for 4h to obtain Sn and K-containing alumina Carrier sample. Then weigh a certain amount of chloroplatinic acid, dissolve it in deionized water, and dilute it to 27 mL, add it to the alumina sample containing Sn and K, age for 4 hours, and place the obtained sample in a tubular heating furnace without clear water. The temperature is raised to 400°C in a nitrogen atmosphere, and a mixed gas of methane, nitrogen and oxygen is introduced. The methane concentration is 15v%, the oxygen concentration...

example 2

[0016] Weigh the alumina carrier (spherical, diameter 1mm, pore volume 0.73cm) containing a certain amount of Sn 3 / g, specific surface area 232m 2 / g, the following examples all use the carrier) 30g, deionized water is added dropwise to the initial moisture, the volume of consumed water is 27mL. Weigh a certain amount of potassium nitrate and dissolve it in deionized water, dilute it to 27mL, add it to 30g of Sn-containing alumina sample, age for 6h, dry at 100℃ for 6h, and calcinate at 600℃ for 6h to obtain Sn and K-containing alumina Carrier sample. Then weigh a certain amount of chloroplatinic acid, dissolve it in deionized water, dilute to 27 mL, add it to the above-mentioned Sn and K-containing alumina sample, and age for 4 hours. The sample without water is placed in a tubular heating furnace, heated to 450°C in a nitrogen atmosphere, and a mixed gas of methane, nitrogen, and oxygen is introduced. The methane concentration is 10v%, the oxygen concentration is 1v%, and th...

example 3

[0018] Weigh the alumina carrier (spherical, diameter 1mm, pore volume 0.73cm) containing a certain amount of Sn 3 / g, specific surface area 232m 2 / g, the following examples all use this carrier) 30g, deionized water is added dropwise to the initial moisture, the volume of consumed water is 27mL. Weigh a certain amount of potassium nitrate and dissolve it in deionized water, dilute it to 27mL, add it to 30g of Sn-containing alumina sample, age for 8h, dry at 120°C for 4h, and calcinate at 400°C for 8h to obtain an alumina carrier containing Sn and K sample. Then weigh a certain amount of chloroplatinic acid, dissolve it in deionized water, dilute to 27 mL, add it to the above-mentioned alumina sample containing Sn and K, and age for 6 hours. After there is no water, the sample is placed in a tubular heating furnace, heated to 350°C in a nitrogen atmosphere, and a mixed gas of methane, nitrogen, and oxygen is introduced. The methane concentration is 20v%, the oxygen concentrati...

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Abstract

The invention discloses a preparation method for a propane dehydrogenation catalyst. Without hydrogen reduction, a reaction feed gas is directly introduced and the Pt reduction degree is controlled to improve the stability and sulfur tolerance of the catalyst. The method omits of the drying roasting process, can effectively remove chlorine from the catalyst without hydrothermal treatment, and can significantly improve the activity, selectivity, stability and sulfur tolerance of the catalyst without hydrogen reduction. The preparation method is simple. The catalyst prepared by the method can avoid excessive alkali loss, improve the dispersity of Pt based catalyst active metals, form more secondary active phases, and ultimately improve the selectivity of the target product propylene and the catalyst activity, stability and sulfur tolerance.

Description

Technical field [0001] The invention relates to a low-carbon alkane dehydrogenation catalyst and a preparation method thereof, in particular to a catalyst for the dehydrogenation of propane to propylene and a preparation method thereof. Background technique [0002] The development and application of shale gas in North America has caused the price of natural gas to fall sharply relative to the price of crude oil. At the same time, it has also made the raw material of the ethylene cracking unit lighter, resulting in a sharp drop in the output of propylene, a by-product of petroleum. Moreover, with the increasing scarcity of petroleum resources, the production of propylene has shifted from relying solely on petroleum as a raw material to a technical route with diversified raw material sources, which has gradually become a trend. Dehydrogenation of propane from natural gas (conventional natural gas, shale gas, coal-bed methane, combustible ice, etc.) to produce propylene is an effec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/62C07C11/06C07C5/333
CPCY02P20/52
Inventor 王卫强吴明官琳悦马贵阳吴玉国贾冯睿
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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