Light-alkane dehydrogenation-to-olefins catalyst and preparation method thereof

A technology of low-carbon alkanes and catalysts, which is applied in the field of low-carbon alkanes dehydrogenation to olefins catalysts and its preparation, which can solve the problems of changing the internal structure of pores and blocking secondary pores, and achieves simple preparation methods, improved mechanical strength, and is suitable for The effect of industrial production

Active Publication Date: 2017-05-17
SINOPEC DALIAN RES INST OF PETROLEUM & PETROCHEMICALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For mesoporous materials such as alumina, the pore size is larger, and silicon ester molecules can enter the pores of alumina, and the SiO remaining in the pores after calcination 2 It not only changes the internal structure of the pores, but also affects the loaded main catalytic components, and even blocks the secondary pores, so that the active components in the secondary pores cannot contact the reactants to carry out the catalytic reaction.

Method used

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  • Light-alkane dehydrogenation-to-olefins catalyst and preparation method thereof
  • Light-alkane dehydrogenation-to-olefins catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Catalyst preparation:

[0038] (1) Weigh an appropriate amount of chloroplatinic acid, dissolve it in deionized water, and impregnate 10kg of Al containing Sn 2 o 3 carrier, the immersion time is 3h. Then place it in a drying oven for drying, the drying temperature is 110° C., and the drying time is 6 hours. Then it is placed in a muffle furnace for calcination, the calcination temperature is 600°C, and the calcination time is 6h.

[0039] (2) The mass water absorption rate of the catalyst obtained after roasting was measured to be 75%. An appropriate amount of zinc nitrate and potassium nitrate was prepared into an aqueous solution with 7.37kg of ionized water, and the catalyst obtained in step (1) was impregnated to make it absorb water to saturation.

[0040] (3) Evenly spread the catalyst that has absorbed water to saturation on the drying belt with a thickness of 3.5cm. Control the transmission speed of the drying belt to 50m / h, the drying temperature to 150°C, ...

Embodiment 2

[0051] Catalyst preparation:

[0052] (1) Weigh an appropriate amount of chloroplatinic acid, dissolve it in deionized water, and impregnate 10kg of Al containing Sn 2 o 3 carrier, the immersion time is 6h. Then place it in a drying oven for drying, the drying temperature is 120° C., and the drying time is 5 hours. Then place it in a muffle furnace for calcination, the calcination temperature is 550°C, and the calcination time is 5h.

[0053] (2) The mass water absorption rate of the catalyst obtained after roasting was measured to be 75%, and an appropriate amount of lanthanum nitrate was prepared into an aqueous solution with 7.36 kg of ionized water, and the catalyst obtained in step (1) was impregnated to make it absorb water to saturation.

[0054] (3) Spread the catalyst that has absorbed water to saturation evenly on the drying belt with a thickness of 4cm. Control the transmission speed of the drying belt to 45m / h, the drying temperature to 140°C, and pass through t...

Embodiment 3

[0059] Catalyst preparation:

[0060] (1) Dissolve an appropriate amount of chloroplatinic acid in deionized water, and impregnate 10kg of Al containing Sn 2 o 3 carrier, the immersion time is 4h. Then place it in a drying oven for drying, the drying temperature is 110° C., and the drying time is 5 hours. Then place it in a muffle furnace for calcination, the calcination temperature is 650°C, and the calcination time is 5h.

[0061] (2) The mass water absorption rate of the catalyst obtained after calcination was measured to be 66%, and an appropriate amount of gallium nitrate was prepared into an aqueous solution with 7.38 kg of ionized water, and the catalyst obtained in step (1) was impregnated to make it absorb water to saturation.

[0062] (3) Spread the catalyst that has absorbed water to saturation evenly on the drying belt with a thickness of 4cm. Control the transmission speed of the drying belt to 45m / h, the drying temperature to 140°C, and pass through the 40m lo...

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Abstract

The invention discloses a light-alkane dehydrogenation-to-olefins catalyst and a preparation method thereof. The catalyst contains, by weight, 0.1-0.5% of a SiO2 coating, 0.05-0.8% of Pt element, 0.1-5.0% of Sn element, 0.1-5.5% of an auxiliary agent, and the rest of active Al2O3. The thickness of the SiO2 coating is 0.01-10 nm. The preparation method comprises the following steps: (1) loading an active ingredient Pt onto an active Al2O3 carrier, drying and roasting; (2) carrying out saturated impregnation-calcination by the use of an impregnation liquid containing promoter metal, and carrying out semi-dry dehydration; (3) impregnating a catalyst precursor obtained in the step (2) by the use of an organic solvent solution containing estersil; and (4) drying the catalyst precursor obtained in the step (3), and roasting so as to obtain the catalyst. The surface of the catalyst is smooth and wear-resistant and has low abrasion. The catalyst is more suitable for moving-bed dehydrogenation process and has good conversion rate of alkanes and good olefin selectivity in the light-alkane dehydrogenation reaction.

Description

technical field [0001] The invention relates to a low-carbon alkane dehydrogenation olefin catalyst and a preparation method thereof. Background technique [0002] The development of shale gas in North America has led to a sharp decline in natural gas prices relative to crude oil prices, while the production of large condensate liquids (NGLs) in shale gas has also increased rapidly. Shale gas condensate is rich in low-carbon alkanes such as ethane, propane, and butane. Ethane can be used as a cracking raw material to produce ethylene. Therefore, FCC technology alone cannot meet the rapidly growing demand for propylene. Dehydrogenation of low-carbon alkanes in natural gas (conventional natural gas, shale gas, coalbed methane, combustible ice, etc.) to produce low-carbon olefins is an effective way to solve this problem. Moreover, with the increasing scarcity of petroleum resources, the production of propylene has changed from relying solely on petroleum as a raw material to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/62B01J23/63B01J23/656C07C5/333C07C11/06
CPCY02P20/52B01J23/002B01J23/62B01J23/626B01J23/63B01J23/6562B01J2523/00C07C5/3337C07C2523/62C07C2523/63C07C2523/656B01J2523/828B01J2523/43B01J2523/27B01J2523/13B01J2523/41B01J2523/31B01J2523/3706B01J2523/32B01J2523/72C07C11/06
Inventor 王振宇郑步梅张淑梅
Owner SINOPEC DALIAN RES INST OF PETROLEUM & PETROCHEMICALS CO LTD
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