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A kind of alkane dehydrogenation catalyst containing mixed Pt crystals and preparation method thereof

An alkane dehydrogenation and catalyst technology, which is applied in catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. efficiency, good regeneration stability, good operability

Active Publication Date: 2019-10-11
CHINA NAT OFFSHORE OIL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the active component Pt of the catalyst in the existing preparation technology is a single crystal form, which causes the catalyst to be easily coked and deactivated during use at high temperature, and a kind of alkane dehydrogenation catalyst containing mixed Pt crystals is provided The preparation method, the catalyst prepared by this method deactivates slowly when used at high temperature, and the activity returns to normal after regeneration

Method used

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  • A kind of alkane dehydrogenation catalyst containing mixed Pt crystals and preparation method thereof
  • A kind of alkane dehydrogenation catalyst containing mixed Pt crystals and preparation method thereof
  • A kind of alkane dehydrogenation catalyst containing mixed Pt crystals and preparation method thereof

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Embodiment 1

[0024] Catalyst C: Catalyst C is prepared by co-impregnating Pt and Sn into the interior of the carrier first, and then co-impregnating Pt and K on the surface of the carrier. This preparation method makes the catalyst contain two crystals of Pt-Sn and Pt-K, Pt: 0.3w %, Sn: 0.6w% and K: 0.9w%.

[0025] (1) Carrier preparation is the same as the carrier preparation method in (1) of Comparative Example 1.

[0026] (2) 1.5ml concentration of 0.2M chloroplatinic acid aqueous solution and 7.4ml concentration of 0.18M stannous chloride aqueous acid solution are mixed evenly, according to the saturated water absorption of the carrier used, add hydrochloric acid and Water makes the hydrochloric acid concentration of the impregnating solution finally prepared to be 1.5M, the volume of the impregnating solution is 22ml, shake well and impregnate on a 26.66g carrier, place at room temperature for 12 hours, dry at 120°C for 5 hours, and bake at 550°C After 4 hours, a Pt-Sn-containing car...

Embodiment 2

[0029] Catalyst D: Catalyst D is prepared by co-impregnating Pt and Sn into the interior of the carrier first, and then co-impregnating Pt and Rb onto the surface of the carrier. This preparation method makes the catalyst contain two crystals of Pt-Sn and Pt-Rb, Pt: 0.3w %, Sn: 0.6w%, and Rb: 0.9w%.

[0030] (1) Carrier preparation is the same as the carrier preparation method in (1) of Comparative Example 1.

[0031] (2) 1.5ml concentration of 0.2M chloroplatinic acid aqueous solution and 7.4ml concentration of 0.18M stannous chloride aqueous acid solution are mixed evenly, according to the saturated water absorption of the carrier used, add hydrochloric acid and Water makes the hydrochloric acid concentration of the impregnating solution finally prepared to be 1.5M, the volume of the impregnating solution is 22ml, shake well and impregnate on a 26.66g carrier, place at room temperature for 12 hours, dry at 120°C for 5 hours, and bake at 550°C After 4 hours, a Pt-Sn-containi...

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Abstract

The invention discloses an alkane dehydrogenation catalyst containing a mixed Pt crystal. The catalyst is formed by three parts: an active component, accessory ingredients and a carrier, wherein the active component is Pt; the accessory ingredients are alkali metal and IVB group metal; a Pt-IVB complex crystal is concentrated in the carrier; a Pt-alkali metal octahedron crystal is concentrated on the surface of the carrier. The invention also discloses a preparation method of the catalyst. The method comprises the steps of firstly preparing Pt-IVB metal impregnation liquid with the acid concentration ranging from 1 to 3M, equivalent-volume impregnating onto the carrier, and standing, drying and roasting at room temperature to prepare a carrier containing a Pt-Sn crystal; then equivalent-volume impregnating Pt-alkali metal impregnation liquid with the acid concentration ranging from 0.2 to 0.8M onto the carrier containing the Pt-Sn, and standing, drying and roasting at room temperature to prepare the alkane dehydrogenation catalyst containing the mixed Pt crystal. Compared with a catalyst only containing a single crystal, the catalyst containing the mixed Pt crystal has better dehydrogenation activity, slower inactivation, and longer life.

Description

technical field [0001] The invention relates to a catalyst and a preparation method for preparing corresponding olefins from dehydrogenation of low-carbon alkane, in particular to a catalyst for improving the activity and service life of a catalyst for dehydrogenation of low-carbon alkane to olefin and a preparation method thereof, belonging to the field of catalyst preparation. Background technique [0002] Propylene is an important organic chemical raw material, and its main source is the by-products of traditional oil refining processes such as steam cracking and catalytic cracking. Therefore, the production of propylene is subject to the production of the main products ethylene and refined oil. The propylene output of the current traditional process cannot meet the market demand for propylene, and the market gradually pays attention to the new alternative production process of propylene, including propane dehydrogenation (PDH), methanol to olefins (MTO, MTP), deep catalyt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/62B01J37/18C07C5/333C07C11/06
Inventor 孙彦民吴青蔡奇
Owner CHINA NAT OFFSHORE OIL CORP
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