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A kind of isobutane dehydrogenation catalyst and its preparation method and application

A technology of dehydrogenation catalyst and isobutane, which is applied in the direction of catalysts, carbon compound catalysts, chemical instruments and methods, etc., can solve the problems of reduced stability, mechanical strength and high temperature stability, and low selectivity. Achieve the effects of improving selectivity and high temperature stability, inhibiting the formation rate of carbon deposits, and weakening the strong acid sites on the surface

Active Publication Date: 2021-12-17
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

γ-Al 2 o 3 As a carrier, it is characterized by strong acidity, which can easily lead to reactions such as polymerization, polycondensation, cracking, and isomerization. Therefore, the catalyst will have a certain degree of carbon deposition, which will reduce its stability, and at the same time, the selectivity is not high.
Although the zinc aluminate composite support can reduce the acidity to a certain extent, its pore volume, pore diameter and specific surface area are difficult to control, and the mechanical strength and high temperature stability cannot be guaranteed.
[0009] In summary, although the current PtSnK / Al 2 o 3 The catalyst has been used in the reaction of low-carbon hydrocarbons, but its catalytic activity and stability are still not ideal, and further optimization and improvement of the catalyst are needed to meet the requirements of industrialization

Method used

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  • A kind of isobutane dehydrogenation catalyst and its preparation method and application
  • A kind of isobutane dehydrogenation catalyst and its preparation method and application
  • A kind of isobutane dehydrogenation catalyst and its preparation method and application

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preparation example Construction

[0029] With respect to the preparation method of isobutane dehydrogenation catalyst of the present invention:

[0030] Preferably, the soluble zinc salt is zinc sulfate, zinc chloride or zinc nitrate.

[0031] Preferably, the ratio of the soluble zinc salt, dilute ammonia water and citric acid is 15-75g: 10-20mL: 5-10g.

[0032] Preferably, the drying temperature in the steps (1), (3) and (4) is 80-120° C., and the drying time is 2-4 hours.

[0033] Preferably, the roasting time in the steps (1), (3) and (4) is 4-8h.

[0034] Preferably, the number of immersion in the step (1) is 1-3 times, and the time of each immersion is 4-8h.

[0035] With respect to the method for isobutene dehydrogenation of isobutane of the present invention:

[0036] Preferably, the heating rate is 2-5°C / min.

[0037] Preferably, the volume space velocity of the isobutane is 200-1000h -1 , more preferably 600h -1 .

[0038] Preferably, the molar ratio of isobutane to hydrogen is 1-10:1, more pre...

Embodiment 1

[0040] (1) 18.27g zinc nitrate (Zn(NO 3 )2 ·6H 2 O) Dissolve in 50mL deionized water, add 10mL dilute ammonia water (25%) and 5g citric acid and stir to form a complex solution, then put 95g industrially shaped γ-Al 2 o 3 Put the ball into the prepared complexing solution, dipping temperature 20°C, dipping time 8h, dipping times 1 time; after drying at 120°C for 2h, program the temperature to 1000°C and roasting, roasting time 4h, to obtain ZnO-Al 2 o 3 Composite carrier, wherein the zinc oxide content in the prepared composite carrier is 5wt%.

[0041] (2) Weigh 0.55g chloroplatinic acid hydrate (H 2 PtCl 6 ·6H 2 O) be dissolved in 50mL deionized water, prepare H 2 PtCl 6 solution. Weigh 0.45g stannous chloride hydrate (SnCl 2 .2H 2 O) be dissolved in 50mL deionized water, prepare SnCl 2 solution.

[0042] (3) The prepared ZnO-Al 2 o 3 Put the composite carrier into the coating device, adjust the temperature of the drum of the coating device to 60°C, and slowly...

Embodiment 2

[0045] The preparation method of catalyzer is similar to embodiment 1, and difference changes the step (1) of embodiment 1 into 36.5g zinc nitrate and is dissolved in 50mL deionized water, adds 10mL dilute ammonia water (25%) and 5g citric acid and Stir to make a complex solution, and then put 90g of industrial molding γ-Al 2 o 3 Put the ball into the prepared complexing solution; other steps and conditions remain unchanged to prepare the catalyst of this example, wherein the zinc oxide content in the prepared composite carrier is 10wt%.

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Abstract

The invention discloses an isobutane dehydrogenation catalyst and its preparation method and application. The catalyst uses zinc oxide surface modification and heat treatment to form a thin-layer zinc aluminate spinel structure α-Al 2 o 3 The ball is a carrier, and the surface of the carrier has a first active layer and a second active layer that are different from each other in sequence from the inside to the outside, the first active layer is a platinum oxide layer or a tin oxide layer, and the second active layer is a platinum oxide layer or tin oxide layer. The isobutane dehydrogenation catalyst of the present invention has high selectivity, stability and activity, good high temperature stability, strong anti-coking ability, relatively slow deactivation rate, and the active components are distributed on the carrier in an eggshell structure On the one hand, the utilization rate of active components is improved, and it has better industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of catalytic dehydrogenation of low-carbon hydrocarbons, and in particular relates to an isobutane dehydrogenation catalyst and a preparation method and application thereof. Background technique [0002] With the integration and large-scale development of oil refining and the successful development of shale gas, a large amount of refinery dry gas and low-carbon alkanes mainly C3 and C4 are produced. Converting low-carbon hydrocarbons represented by isobutane into products with high added value through catalytic dehydrogenation is one of the key technologies to improve the utilization efficiency of low-carbon hydrocarbons and realize the efficient utilization of carbon-based energy. It has broad practical prospects and huge economic benefits. As the demand for products such as high-purity isobutene and alkyl gasoline continues to rise, opportunities have been created for the development of isobutane dehydrog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/62C07C5/333C07C11/09
CPCB01J23/002B01J23/626C07C5/3332B01J2523/00C07C2523/62B01J35/397B01J2523/27B01J2523/31B01J2523/43B01J2523/828C07C11/09
Inventor 连奕新刘义云刘毅赖伟坤董焕能王伦韬
Owner XIAMEN UNIV
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