Preparation method for 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: 2015-01-21
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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  • Preparation method for low carbon alkane dehydrogenation catalyst

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0014] Weigh an alumina carrier (spherical, 1 mm in diameter, 0.73 cm in pore volume) containing a certain amount of Sn 3 / g, specific surface area 232m 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. Weigh a certain amount of potassium nitrate and dissolve it in deionized water, set the volume to 27mL, add it to 30g of Sn-containing alumina sample, age for 4h, dry at 80°C for 8h, and roast at 600°C for 4h to obtain Sn and K-containing alumina Carrier samples. Then weigh a certain amount of chloroplatinic acid and dissolve it in deionized water, set the volume to 27mL, add it to the above-mentioned alumina sample containing Sn and K, age for 4h, and place the obtained sample in a tubular heating furnace after there is no clear water. Raise the temperature to 400°C under a nitrogen atmosphere, and feed a mixed gas of methane, nitrogen, and oxygen, wherein the concentrat...

example 2

[0016] Weigh an alumina carrier (spherical, 1 mm in diameter, 0.73 cm in pore volume) containing a certain amount of Sn 3 / g, specific surface area 232m 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. Weigh a certain amount of potassium nitrate and dissolve it in deionized water, set the volume to 27mL, add it to 30g of Sn-containing alumina sample, age for 6h, dry at 100°C for 6h, and roast at 600°C for 6h to obtain Sn and K-containing alumina Carrier samples. A certain amount of chloroplatinic acid was then weighed and dissolved in deionized water, and the volume was adjusted to 27 mL, and added to the above-mentioned alumina sample containing Sn and K, and aged for 4 hours. The sample without clear water is placed in a tubular heating furnace, heated to 450°C under a nitrogen atmosphere, and a mixed gas of methane, nitrogen, and oxygen is introduced, wherein the con...

example 3

[0018] Weigh an alumina carrier (spherical, 1 mm in diameter, 0.73 cm in pore volume) containing a certain amount of Sn 3 / g, specific surface area 232m 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. Weigh a certain amount of potassium nitrate and dissolve it in deionized water, set the volume to 27mL, add it to 30g of Sn-containing alumina sample, age for 8h, dry at 120°C for 4h, and roast at 400°C for 8h to obtain Sn, K-containing alumina support sample. A certain amount of chloroplatinic acid was then weighed and dissolved in deionized water, and the volume was adjusted to 27 mL, and added to the above-mentioned alumina sample containing Sn and K, and aged for 6 hours. After no clear water, the sample is placed in a tubular heating furnace, heated to 350°C under a nitrogen atmosphere, and a mixed gas of methane, nitrogen, and oxygen is introduced, wherein the concen...

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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 propane dehydrogenation propylene catalyst and a preparation method thereof. Background technique [0002] The development and application of shale gas in North America has led to a sharp drop in the price of natural gas relative to crude oil prices. At the same time, it has also made the raw materials of ethylene crackers lighter, resulting in a sharp drop in the production of propylene, a by-product of petroleum as raw materials. Moreover, with the increasing scarcity of petroleum resources, the production of propylene has changed from relying solely on petroleum as a raw material to diversifying the technical route of raw material sources, which has gradually become a trend. Dehydrogenation of propane by-produced in natural gas (conventional natural gas, shale gas, coal bed methane, combustible ice, etc.) to produce propylene is...

Claims

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Application Information

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Patent Type & Authority Applications(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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