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Platinum-alumina composite catalyst for dehydrogenation of alkane

A composite catalyst, platinum alumina technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, hydrocarbons, etc., can solve problems such as slow carbon deposition and deactivation, and achieve stability Good, good diffusion performance, enhanced diffusion ability

Active Publication Date: 2019-01-04
XIAN CATALYST NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pt catalysts are more environmentally friendly than Cr-based catalysts, but the catalysts are faced with the problem of slow carbon deposition and deactivation during the reaction process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. γ-Al 2 o 3 modified

[0024] 98.9g γ-Al 2 o 3 Place in a 300mL autoclave, add 150mL solvent to completely cover γ-Al 2 o 3 , then seal the autoclave, replace the air in the autoclave with nitrogen for 3 times, then start to increase the temperature, and when the temperature rises to 150°C, add nitrogen to make the pressure in the autoclave reach 2MPa, and keep it at this temperature and pressure for 2 hours Afterwards, release the pressure quickly, continue to raise the temperature to 900°C under normal pressure, keep it for 2 hours, and then lower it to room temperature to obtain the modified γ-Al 2 o 3 .

[0025] 2. Catalyst impregnation

[0026] Add 0.25g of potassium chloroplatinate and 0.95g of stannous chloride into 150mL of solvent, stir until completely dissolved to obtain an impregnation solution containing Pt and Sn; add 1.22g of lithium chloride and 0.48g of ytterbium trichloride into 150mL of solvent , and stirred until completely dissolved to ob...

Embodiment 2

[0029] 1. γ-Al 2 o 3 modified

[0030] 98.85g γ-Al 2 o 3 Place in a 300mL autoclave, add 140mL solvent to completely cover γ-Al 2 o 3, then seal the autoclave, replace the air in the autoclave with nitrogen for 3 times, then start to increase the temperature, and when the temperature rises to 170°C, add nitrogen to make the pressure in the autoclave reach 4MPa, and keep it at this temperature and pressure for 2 hours Afterwards, release the pressure quickly, continue to raise the temperature to 900°C under normal pressure, keep it for 2 hours, and then lower it to room temperature to obtain the modified γ-Al 2 o 3 .

[0031] 2. Catalyst impregnation

[0032] Add 0.37g of potassium chloroplatinate and 1.14g of stannous chloride into 140mL of solvent and stir until completely dissolved to obtain an impregnation solution containing Pt and Sn; add 0.61g of lithium chloride and 0.48g of ytterbium trichloride into 140mL of solvent , and stirred until completely dissolved to...

Embodiment 3

[0035] 1. γ-Al 2 o 3 modified

[0036] 98.8g γ-Al 2 o 3 Place in a 300mL autoclave, add 150mL solvent to completely cover γ-Al 2 o 3 , then seal the autoclave, replace the air in the autoclave with nitrogen for 3 times, then start to increase the temperature, and when the temperature rises to 160°C, add nitrogen to make the pressure in the autoclave reach 3MPa, and keep at this temperature and pressure for 2 hours Afterwards, release the pressure quickly, continue to raise the temperature to 900°C under normal pressure, keep it for 2 hours, and then lower it to room temperature to obtain the modified γ-Al 2 o 3 .

[0037] 2. Catalyst impregnation

[0038] Add 0.5g of potassium chloroplatinate and 0.95g of stannous chloride into 150mL of solvent and stir until completely dissolved to obtain an impregnation solution containing Pt and Sn; add 1.22g of lithium chloride and 0.48g of ytterbium trichloride into 150mL of solvent , and stirred until completely dissolved to obt...

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PUM

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Abstract

The invention discloses a platinum-alumina composite catalyst for dehydrogenation of an alkane. The catalyst is a spherical gamma-Al2O3 carrier, and supports an active component Pt and auxiliary agents Sn, Li and Yi, Pt loading is 0.1%-0.2%, and the total loading of Sn, Li and Yi is 1%. The catalyst is prepared by a batch autoclave process, the carrier is modified firstly, the crystal form and surface properties of alumina are modified, which is more favorable for the loading of an active component, the active component and the auxiliary agents are impregnated in two steps, and the auxiliary agents can strongly interact with the active component, which effectively increases the dispersion of the metal Pt, reduces the carbon deposit on a catalyst surface, and improves the selectivity and yield of the olefin, thereby enhancing the stability and service life of the catalyst. Test results show that the catalyst has good catalytic activity in the dehydrogenation reaction of propane and butane, the propane conversion rate is 35% to 32% in 72 hours, and the propylene selectivity is 90% to 95%.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a platinum-alumina composite catalyst for propane or butane dehydrogenation. Background technique [0002] Propylene is a very important chemical raw material, and its annual demand is second only to ethylene. It is mainly used to produce acrylonitrile, propylene oxide, acrylic acid, etc. As the demand for downstream products such as polypropylene increases year by year, the supply of propylene appears to be in short supply. Propylene mainly comes from the by-products of steam cracking to produce ethylene, and a small part comes from the by-products of catalytic cracking to produce gasoline or diesel. The production of propylene through propane dehydrogenation only accounts for about 3% of the propylene source. In recent years, with the downward trend of propane prices, the production of propylene using propane as raw material has attracted more and more attention. At present,...

Claims

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Application Information

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IPC IPC(8): B01J23/63C07C5/333C07C11/06
CPCB01J23/63C07C5/333C07C11/06Y02P20/52
Inventor 林涛万克柔程杰张炳亮张力曾利辉高武曾永康张之翔
Owner XIAN CATALYST NEW MATERIALS CO LTD
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