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A kind of preparation method of low carbon alkane dehydrogenation catalyst

A dehydrogenation catalyst, a technology for low-carbon alkanes, applied in the fields of hydrocarbons, hydrocarbons, chemical instruments and methods, etc., can solve the problems of reduced olefin selectivity, high energy consumption, catalyst deactivation, etc.

Active Publication Date: 2017-02-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrothermal dechlorination process not only consumes a lot of energy, but more importantly, at high temperature (above 550°C), the active component Pt particles will aggregate and grow, resulting in a decrease in the selectivity of olefins, and even sintering of Pt, resulting in permanent loss of the catalyst. live

Method used

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  • A kind of preparation method of low carbon alkane dehydrogenation catalyst

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Effect test

Embodiment 1

[0030] Preparation of Sn-containing alumina carrier: mix a certain amount of 0.98M aluminum trichloride solution and 0.01M tin tetrachloride solution, add a certain amount of 8% ammonia water, and put it in a neutralization tank at 60~80°C Mix evenly, control the pH value to 7.0~9.0, filter, wash with water, and acidify, pressurize into balls in the oil ammonia column, dry, age, and roast at 650~750°C for 4 hours to obtain Sn-containing powder with a particle size of 1.5mm. 0.3wt% spherical alumina.

[0031] Weigh 0.7 g of potassium nitrate and dissolve it in 100 ml of deionized water. Measure 50ml of spherical alumina carrier containing 0.3wt% Sn and weigh its mass to be about 26g. It was placed in a rotary evaporator and vacuumed for 30 min. Then suck the solution into the rotary evaporator, turn off the vacuum pump, keep the temperature of the water bath at 60° C., and immerse at normal pressure for 6 hours. Then, the temperature of the water bath was raised to 80°C, the...

Embodiment 2

[0049] Spherical silicon oxide with a diameter of 1.8mm was selected as the carrier. Measure 60ml of spherical silica carrier and weigh its mass to be about 25g.

[0050] Weigh 0.66 g of potassium nitrate and dissolve it in 150 ml of deionized water. The measured carrier was placed in a rotary evaporator and vacuumed for 30 min. Then suck the solution into the rotary evaporator, turn off the vacuum pump, keep the temperature of the water bath at 60° C., and immerse at normal pressure for 6 hours. Then, the temperature of the water bath was raised to 80°C, the catalyst was vacuum-dried and then transferred into a beaker and placed in an oven at 80°C. Perform temperature-programmed drying in an oven, raise the temperature to 110°C at a rate of 0.8°C / min, and stay for 6 hours.

[0051] Weigh 0.34 g of solid chloroplatinic acid, dissolve it in 120 ml of anhydrous acetone, and adjust the pH of the solution to 1 with glacial acetic acid. The above dried carrier was placed in a r...

Embodiment 3

[0055] Spherical zirconia with a diameter of 1.4 mm is selected as the carrier. Immerse in an aqueous solution containing cerium nitrate and zinc nitrate for 3 hours, dry at 110°C for 2 hours, and bake at 500°C for 4 hours. Measure 50ml of the spherical zirconia carrier loaded with auxiliary agent and weigh its mass as about 34g.

[0056] Weigh 1.1 g of potassium nitrate and dissolve it in 150 ml of deionized water. The measured carrier was placed in a rotary evaporator and vacuumed for 30 min. Then suck the solution into the rotary evaporator, turn off the vacuum pump, keep the temperature of the water bath at 60° C., and immerse at normal pressure for 6 hours. Then, the temperature of the water bath was raised to 80°C, the catalyst was vacuum-dried and then transferred into a beaker and placed in an oven at 80°C. Perform temperature-programmed drying in an oven, raise the temperature to 115°C at a rate of 0.7°C / min, and stay for 6 hours.

[0057] Weigh 0.91 g of solid ch...

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Abstract

The invention discloses a preparation method for a catalyst for dehydrogenation of a low-carbon alkane. The preparation method comprises the following steps: (1) performing immersion treatment on an inorganic oxide carrier with an aqueous solution of potassium nitrate, and then performing program heating drying treatment to obtain a treated inorganic oxide carrier; (2) dissolving chloroplatinic acid in an organic solvent, adjusting the pH value to obtain a chloroplatinic acid immersion liquid, immersing the carrier obtained by the step (1) with the chloroplatinic acid immersion liquid, performing program heating drying treatment, roasting, washing, drying and dewatering to obtain the catalyst for the dehydrogenation of the low-carbon alkane. According to the method, hydrothermal dechlorination is not required to be performed; the preparation method for the catalyst is simplified; the aggregation and growth of Pt particles are avoided; the energy consumption is reduced; the production cost is reduced.

Description

technical field [0001] The invention relates to a preparation method of a catalyst for the catalytic dehydrogenation of light alkanes to olefins. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/62B01J23/89B01J23/63C07C11/06C07C5/333
CPCY02P20/52
Inventor 王振宇张海娟李江红
Owner CHINA PETROLEUM & CHEM CORP
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