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Dehydrogenation catalyst and preparation method thereof

A dehydrogenation catalyst and catalyst technology, applied in the direction of catalysts, molecular sieve catalysts, carbon compound catalysts, etc., can solve the problems of olefin selectivity reduction, catalyst deactivation, Pt sintering, etc., to reduce production costs, save energy consumption, and easy to operate Effect

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

AI Technical Summary

Problems solved by technology

The temperature of hydrothermal dechlorination is generally between 500°C and 600°C. The hydrothermal dechlorination process not only consumes a lot of energy, but more importantly, the active component Pt particles will aggregate and grow under high temperature (above 550°C). Reduce the selectivity of olefins, even cause the sintering of Pt, and permanently deactivate the catalyst

Method used

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  • Dehydrogenation catalyst and preparation method thereof
  • Dehydrogenation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of the carrier: Select 200g of ZSM-5 molecular sieve with a relative crystallinity of 50% and a silicon-aluminum ratio of 100, mix them evenly with 350g of alumina and 25g of turnip powder, add 50g of dilute nitric acid solution with a mass concentration of 10%, knead and extrude forming. The molded carrier was dried in the shade for 24 hours, then dried in an oven at 110° C. for 12 hours, and then baked in a muffle furnace at 600° C. for 6 hours. Then break the carrier to a length of 2-3 mm for later use.

[0029] Tin tetrachloride is formulated as an impregnating solution, impregnated with the above-mentioned carrier, then dried and roasted.

[0030] Impregnation of active components: Weigh 0.55 g of solid chloroplatinic acid and 0.28 g of sodium nitrite, dissolve them in 150 mL of deionized water, and stir thoroughly. After the solute is dissolved, heat the impregnating liquid to 100°C and boil, and stir at a speed of 60 rpm. After boiling for 15 minute...

Embodiment 2

[0045] Preparation of the carrier: Select 200g of ZSM-5 molecular sieve with a relative crystallinity of 70% and a silicon-aluminum ratio of 80, mix them evenly with 350g of alumina and 25g of turnip powder, add 50g of dilute nitric acid solution with a mass concentration of 10%, knead and extrude forming. The molded carrier was dried in the shade for 24 hours, then dried in an oven at 110° C. for 12 hours, and then baked in a muffle furnace at 600° C. for 6 hours.

[0046] The tin oxalate is formulated as an impregnating solution, impregnated with the above-mentioned carrier, and then dried and roasted.

[0047] Preparation of impregnation solution: Weigh 0.27 g of solid chloroplatinic acid and 0.17 g of sodium nitrite, dissolve them in 180 mL of deionized water, and stir thoroughly. After the solute is dissolved, heat the impregnation solution to 105°C and boil, and stir at a speed of 60 rpm. After boiling for 18 minutes, cool the impregnation solution to room temperature. ...

Embodiment 3

[0052] Preparation of the carrier: Select 200g of ZSM-5 molecular sieve with a relative crystallinity of 60% and a silicon-aluminum ratio of 180, mix them evenly with 500g of alumina and 45g of turnip powder, add 70g of dilute nitric acid solution with a mass concentration of 10%, knead and extrude forming. The molded carrier was dried in the shade for 24 hours, then dried in an oven at 110° C. for 12 hours, and then baked in a muffle furnace at 600° C. for 6 hours.

[0053] Tin acetate is formulated as an impregnating solution, impregnated with the above-mentioned carrier, then dried and roasted.

[0054] Preparation of impregnation solution: Weigh 0.72g of solid chloroplatinic acid and 0.48g of sodium nitrite, dissolve them in 180mL of deionized water, and stir thoroughly. After the solute is dissolved, heat the impregnation solution to 105°C and boil, and stir at a speed of 60 rpm. After boiling for 18 minutes, cool the impregnation solution to room temperature.

[0055] ...

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Abstract

The invention discloses a dehydrogenation catalyst and a preparation method thereof. The catalyst adopts ZSM-5 molecular sieve doped alumina as a carrier, Pt as an active component and Sn and Na as assistants, and the catalyst comprises, by weight, 0.1-5% of Sn, 0.05-1% of Pt, 0.01-2% of Na, and the balance of the carrier; and the carrier comprises 20-50 wt% of ZSM-5 molecular sieve, wherein the relative crystallinity of the ZSM-5 molecular sieve is 40-80%. The preparation method comprises the following steps: 1, mixing the ZSM-5 molecular sieve, alumina, Sesbaria cannabina powder and a diluted nitric acid solution, beating the obtained mixture, kneading the beaten mixture, extruding the kneaded mixture to form strips, drying the strips, and roasting the dried strips to obtain the carrier; 2, loading the assistant Sn to the carrier; and 3, impregnating the carrier obtained in step 2 in an impregnating solution containing the active component, drying the impregnated carrier, and roasting the dried carrier to obtain the dehydration catalyst. The catalyst has high alkane conversion rate, high olefin selectivity and good stability in a low-carbon alkane dehydrogenation reaction.

Description

technical field [0001] The invention relates to a dehydrogenation catalyst and a preparation method thereof, in particular to a low-carbon alkane catalytic 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 pr...

Claims

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Application Information

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IPC IPC(8): B01J29/44C07C5/333C07C11/06
CPCY02P20/52B01J29/44C07C5/3337C07C2529/44C07C11/06
Inventor 王振宇郑步梅张淑梅
Owner SINOPEC DALIAN RES INST OF PETROLEUM & PETROCHEM
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