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A kind of propane dehydrogenation catalyst and preparation method thereof

A propane dehydrogenation and catalyst technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem that the performance of the catalyst is not particularly ideal, the stability needs to be further improved, Low reaction selectivity and other problems, to achieve the effect of improving anti-carbon deposition ability, ensuring thermal stability, and high dehydrogenation activity

Active Publication Date: 2020-08-28
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, although there have been a large number of research reports on the catalytic dehydrogenation of propane to propylene, the performance of the catalyst is generally not ideal, and there are still low reaction selectivity, serious carbon deposition, and further improvement in stability. The problem

Method used

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  • A kind of propane dehydrogenation catalyst and preparation method thereof
  • A kind of propane dehydrogenation catalyst and preparation method thereof
  • A kind of propane dehydrogenation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Catalyst preparation

[0032] (1) Weigh 35.290g Al(NO 3 ) 3 9H 2 O (molecular weight: 375) and 0.439g Ca (NO 3 ) 2 (Molecular weight: 164) was dissolved in 100ml deionized water to form a solution, and stirred for 1h; the solution was heated to 50°C, neutralized with 5wt% sodium carbonate solution, and the pH was controlled to be 9; after filtering and washing with deionized water, use 12mol / L nitric acid solution was acidified to pH 6, stirred to a sol-like state, and the carrier slurry was obtained. The slurry was taken with a 5mL syringe, fitted with a needle, and the slurry was added dropwise to the oily ammonia column. The sol shrank into a spherical gel, and the small The particle size of the ball is 1.4-1.6 mm. After aging for 2 hours, the gel ball is taken out, washed with deionized water, dried at 120°C for 12 hours, and calcined at 500°C for 8 hours to obtain a composite oxide carrier ball;

[0033] (2) Weigh 0.019g SnCl 2 2H2 O (molecular weight: 226) ...

Embodiment 2

[0038] Catalyst preparation

[0039] (1) Weigh 35.560g Al(NO 3 ) 3 9H 2 O and 0.366g Ca(NO 3 ) 2 Dissolve in 100ml deionized water to form a solution, and stir for 2 hours; heat the solution to 40°C, neutralize with 4wt% sodium carbonate solution, and control the pH to 9; filter and wash with deionized water, use 14mol / L nitric acid solution Acidify to pH 6, stir until it is in the form of a sol to obtain a carrier slurry, use a 5mL syringe to take the slurry, install a needle, add the slurry dropwise to the oily ammonia column, the sol shrinks into a spherical gel, and the particle size of the pellet is controlled to be 1.4 ~1.6mm, after aging for 2 hours, the gel beads were taken out, washed with deionized water, dried at 100°C for 24 hours, and calcined at 600°C for 6 hours to obtain composite oxide carrier beads;

[0040] (2) Weigh 0.029g SnCl 2 2H 2 O and 0.023g BiCl 3 Dissolve in 10.0ml of hydrochloric acid solution with a concentration of 1.0mol / L, make a soluti...

Embodiment 3

[0045] Catalyst preparation

[0046] (1) Weigh 35.330g Al(NO 3 ) 3 9H 2 O and 0.366g Ca(NO 3 ) 2 Dissolve in 100ml deionized water to form a solution, and stir for 1 hour; heat the solution to 60°C, neutralize with 6wt% sodium carbonate solution, and control the pH to 10; filter and wash with deionized water, use 11mol / L nitric acid solution Acidify to pH 6, stir until it is in the form of a sol to obtain a carrier slurry, use a 5mL syringe to take the slurry, install a needle, add the slurry dropwise to the oily ammonia column, the sol shrinks into a spherical gel, and the particle size of the pellet is controlled to be 1.4 ~1.6mm, after aging for 1 hour, take out the gel beads, wash with deionized water, dry at 150°C for 18 hours, and bake at 700°C for 8 hours to obtain composite oxide carrier beads;

[0047] (2) Weigh 0.019g SnCl 2 2H 2 O and 0.060 g BiCl 3 Dissolve in 10.0ml of hydrochloric acid solution with a concentration of 0.5mol / L, make a solution and stir ev...

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Abstract

The invention discloses a propane dehydrogenation catalyst and a preparation method thereof. The catalyst uses CaO-Al 2 o 3 Composite oxide balls are used as the carrier, metal Pt is used as the active component, and the additives are Sn and Bi; based on the mass of the catalyst, the content of metal Pt is 0.1-1.0wt%, Sn is 0.1-2.0wt%, and Bi is 0.1 ‑1.0wt%, CaO is 1.0‑5.0wt%, the rest is Al 2 o 3 . The catalyst is prepared by the co-precipitation method, which can ensure the thermal stability of the catalyst carrier, sufficient specific surface area and pore volume. The catalyst has excellent reaction performance and anti-coking ability. The catalyst has high dehydrogenation activity under high temperature conditions, the propylene selectivity can reach more than 90%, and has good stability.

Description

technical field [0001] The invention relates to a propane dehydrogenation catalyst and a preparation method thereof, in particular to a platinum series catalyst loaded on a composite oxide carrier and a preparation method thereof, and its application in propane dehydrogenation to propylene. Background technique [0002] Propylene is the earliest petrochemical raw material used, and it is also one of the important olefins in the production of petrochemical products. It is mainly used in the production of chemical products such as polypropylene, acrylonitrile, propylene oxide, acrylic acid, acrolein, phenol and butanooctanol. At present, propylene mainly comes from petroleum cracking to produce ethylene and the by-products of petroleum catalytic cracking. Due to the high energy consumption, low selectivity of traditional processes, and the shortage of petroleum resources, people are looking for more economical and efficient production methods for low-alkene such as propylene. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/644B01J35/08B01J37/18C07C5/333C07C11/06
CPCB01J23/6447B01J35/08B01J37/18B01J2231/766C07C5/325C07C11/06Y02P20/52
Inventor 蒋锋孔祥明冯培广李江常林张宏科华卫琦
Owner WANHUA CHEM GRP CO LTD
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