A kind of method of low carbon alkane dehydrogenation reaction
A technology for the dehydrogenation of low-carbon alkanes, which is applied in the direction of hydrocarbons, hydrocarbons, chemical instruments and methods, etc., can solve problems such as complex processes, high sulfur concentration, and heat treatment of catalysts, so as to improve the selectivity of olefins and improve Activity stability, simple and safe effect
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Embodiment 1
[0035] Get a spherical Sn-containing θ-alumina carrier (produced by Sasol, Germany), the Sn content is 0.30% by mass of the carrier mass, impregnate at 25°C for 4 hours with an impregnating solution containing chloroplatinic acid and hydrochloric acid, and the impregnating solution contains 0.30% by mass % of platinum, 1.5% by mass of chlorine (all relative to the mass of alumina on a dry basis, the same below), and the liquid / solid ratio is 1.8mL / g. After impregnation, the solid was dried at 120°C for 12 hours and calcined at 500°C for 4h. The calcined solid was impregnated with potassium hydroxide solution at 25° C. for 4 hours, the solution contained 1.0% by mass of potassium (relative to the mass of alumina on a dry basis), and the liquid / solid ratio was 1.4 mL / g. After impregnation the solid was dried at 120°C for 12 hours. Afterwards, the catalyst was subjected to oxychlorination treatment with air containing water and HCl at 550°C for 4 hours. During the oxychlorinatio...
Embodiment 2
[0038] The dehydrogenation catalyst was prepared in the same manner as in Example 1.
[0039] Put the above-mentioned catalyst into the dehydrogenation reactor, blow and replace it with nitrogen, then raise the temperature from room temperature to 450°C under a nitrogen atmosphere, then stop feeding nitrogen, and feed hydrogen containing hydrogen sulfide, wherein the volume concentration of hydrogen sulfide is 100ppm, and then heated up to 580°C for sulfidation treatment for 2 hours, and the treated catalyst was designated as B. Then feed propane, heat up to 620° C. for dehydrogenation reaction, and continuously feed the hydrogen gas containing hydrogen sulfide during the dehydrogenation reaction, and the reaction conditions are the same as in Example 1. After reacting for 50 hours, the propane conversion rate and propylene selectivity were calculated, and the results are shown in Table 1.
Embodiment 3
[0041] The dehydrogenation catalyst was prepared in the same manner as in Example 1.
[0042] Put the above-mentioned catalyst into the dehydrogenation reactor, blow and replace it with nitrogen, then raise the temperature from room temperature to 450°C under the hydrogen atmosphere, and feed the hydrogen containing hydrogen sulfide, wherein the volume concentration of hydrogen sulfide is 200ppm, and then raise the temperature to 620 ℃ for 4h, and the treated catalyst is denoted as C. Pass into propane to carry out dehydrogenation reaction afterwards, and in the process of dehydrogenation reaction, continue to pass into described hydrogen containing hydrogen sulfide, reaction condition is identical with embodiment 1. After reacting for 50 hours, the propane conversion rate and propylene selectivity were calculated, and the results are shown in Table 1.
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