Preparation method for dehydrogenation catalyst

A dehydrogenation catalyst, inorganic oxide technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of aggregation and growth of active component Pt particles, Pt sintering and high energy consumption

Active Publication Date: 2015-04-29
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

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  • Preparation method for dehydrogenation catalyst
  • Preparation method for dehydrogenation catalyst

Examples

Experimental program
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Embodiment 1

[0025]Preparation of Sn-containing alumina carrier: mix a certain amount of 0.98M aluminum trichloride solution and 0.01M / L tin tetrachloride solution, add a certain amount of 8% ammonia water, and neutralize at 60~80°C Mix evenly in the tank, control the pH value of 7.0~9.0, filter, wash with water, and acidify, pressurize the oil ammonia column to form balls, dry, age, and roast at 650~750°C for 4 hours to obtain granules with a particle size of 1.5mm Spherical alumina containing 0.3wt% Sn.

[0026] Preparation of impregnation solution: Weigh 0.55g of solid chloroplatinic acid and 0.7g of potassium nitrate, dissolve in 100ml of deionized water, and stir thoroughly. Add nitric acid solution dropwise to adjust the pH value of the soaking solution to 1.

[0027] 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 the impregnating solution was sucked into the rota...

Embodiment 2

[0037] Preparation of impregnation solution: Weigh 0.2 g of solid chloroplatinic acid and 0.62 g of potassium nitrate, dissolve them in 140 ml of deionized water, and stir thoroughly. Add nitric acid solution dropwise to adjust the pH value of the soaking solution to 1.

[0038] Spherical silicon oxide with a diameter of 1.8mm was selected as the carrier. Measure 53ml of spherical silica carrier and claim its mass is about 21g. It was placed in a rotary evaporator and vacuumed for 45 min. Then the impregnating solution was sucked into the rotary evaporator, the vacuum pump was turned off, the temperature of the water bath was kept at 70° C., and the impregnation was carried out at normal pressure for 5 hours.

[0039] 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 0.5°C / min,...

Embodiment 3

[0043] Spherical zirconia with a diameter of 1.6mm is selected as the carrier. Immerse in an aqueous solution containing cerium nitrate and copper nitrate for 3 hours, dry at 110°C for 2 hours, and bake at 500°C for 4 hours.

[0044] Preparation of impregnation solution: Weigh 1.1 g of solid chloroplatinic acid and 1.4 g of potassium nitrate, dissolve them in 120 ml of deionized water, and stir thoroughly. Add nitric acid solution dropwise to adjust the pH value of the soaking solution to 1.

[0045] Measure 50ml of the spherical zirconia carrier loaded with auxiliary agent and weigh its mass as about 34g. It was placed in a rotary evaporator and vacuumed for 60 min. Then the impregnating solution was sucked into the rotary evaporator, the vacuum pump was turned off, the temperature of the water bath was kept at 70° C., and the impregnation was carried out at normal pressure for 5 hours.

[0046] Then, the temperature of the water bath was raised to 80°C, the catalyst was v...

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Abstract

The invention discloses a preparation method for a dehydrogenation catalyst. The preparation method comprises the following steps: (1) uniformly mixing chloroplatinic acid, potassium nitrate and water to obtain impregnation liquid; (2) impregnating an inorganic oxide carrier in the impregnation liquid obtained in the step (1) to obtain an impregnated carrier; (3) performing programmed heating and drying on the impregnated carrier in the step (2), roasting, washing, and performing drying and dewatering to obtain the dehydrogenation catalyst. According to the method, the hydrothermal dechlorination process does not need to be carried out, so that the preparation method for the catalyst is simplified, the aggregation growth of Pt particles is avoided, the energy consumption is reduced, and 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 Applications(China)
IPC IPC(8): B01J23/58B01J23/89
Inventor 王振宇张海娟李江红
Owner CHINA PETROLEUM & CHEM CORP
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