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Metal-loaded catalytic system for preparing ethylene by photocatalytic oxidation of ethane dehydrogenation and direct ethane dehydrogenation

A photocatalytic oxidation and catalytic system technology, applied in metal/metal oxide/metal hydroxide catalysts, catalysts, carbon compound catalysts, etc., can solve problems such as lowering temperature, unfavorable conversion rate, and easy coking.

Inactive Publication Date: 2021-01-29
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the catalytic system has the following disadvantages: (1) Currently, for CO 2 The research on the dehydrogenation of oxidized ethane focuses on the thermal catalytic process, high temperature reaction is easy to coke, and lowering the temperature is not conducive to the conversion rate
(2) It has been reported that Pd / P25 is used for CO 2 A photocatalytic system for oxidized ethane dehydrogenation, but simultaneously achieving oxidized ethane dehydrogenation and direct ethane dehydrogenation is still a challenge

Method used

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  • Metal-loaded catalytic system for preparing ethylene by photocatalytic oxidation of ethane dehydrogenation and direct ethane dehydrogenation
  • Metal-loaded catalytic system for preparing ethylene by photocatalytic oxidation of ethane dehydrogenation and direct ethane dehydrogenation
  • Metal-loaded catalytic system for preparing ethylene by photocatalytic oxidation of ethane dehydrogenation and direct ethane dehydrogenation

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Experimental program
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Effect test

Embodiment 1

[0025]Example 1: Weigh 0.5g carrier P25 (TiO2) Add to 25ml deionized water, stir until P25 is completely suspended in the water, add 5.025ml prepared 0.5mg / mL Na to the suspension2PdCl4The solution, continue to stir, adjust the pH to pH=10 with 0.1 mol / L NaOH solution, add 5 mL of methanol, disperse ultrasonically for 20 minutes, and reduce by ultraviolet light for 40 minutes. The resulting precipitate is washed with water and ethanol and centrifuged twice. Dry for 10 hours in a vacuum drying oven at 60°C to obtain 0.5%wt-Pd / TiO2catalyst.

Embodiment 2

[0026]Example 2: Take 25mg sample and sprinkle it evenly on quartz wool, place the catalyst-sprinkled quartz wool in a 100ml intermittent photocatalytic reactor, seal it, and replace the gas so that there is only CO in the reactor2And C2H6Gas, continue to feed reaction gas until the pressure reaches 0.2 MPa, react for 1 hour under ultraviolet light conditions.

[0027]The yield of the gas product obtained after the reaction was analyzed by Agilent Technologies Inc. type gas chromatography, and the origin mapping software was used for drawing analysis.

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Abstract

The invention discloses a metal-loaded catalytic system for photocatalytic oxidation of ethane dehydrogenation and photocatalytic direct ethane dehydrogenation. The catalyst is prepared through methods of photochemical deposition, impregnation reduction and the like, the metal loading capacity and the pH of carrier suspension liquid are controlled, metal particles are evenly dispersed on the surface of a carrier, and metal-loaded catalytic system samples with different particle size distribution are obtained. The sample is used for a reaction system for preparing ethylene by photocatalytic ethane dehydrogenation, and can simultaneously realize the effects of preparing ethylene by photocatalytic CO2 oxidation of ethane dehydrogenation and preparing ethylene by direct ethane dehydrogenationunder a photocatalytic condition. The metal-loaded catalytic system is simple, a method for simultaneously controlling the loading capacity and adjusting the pH value is adopted, and the process conditions and the operation method are short in preparation process. The catalytic system has the characteristics of relatively good activity and high ethylene selectivity when being used for photo-catalyzing ethane direct dehydrogenation or oxidizing ethane for dehydrogenation, has a guiding effect on later development, and has a very good application prospect.

Description

Technical field[0001]The invention belongs to the technical field of photocatalysts, and specifically relates to a method for preparing a metal-supported catalytic system and photocatalytic oxidation of ethane dehydrogenation and direct dehydrogenation of ethane to ethylene.Background technique[0002]Ethylene is the basis of many chemicals, such as styrene, polyethylene, ethylene oxide, and ethylene glycol. Oxidative ethane dehydrogenation is an effective and environmentally friendly method to convert ethane dehydrogenation to ethylene, using CO2As an oxidant, it can prevent deep oxidation of ethane and avoid coking, and improve the chemical balance of ethane dehydrogenation. However, the catalytic system has the following shortcomings: (1) At present, for CO2The research on the dehydrogenation of ethane oxide concentrates on the thermal catalytic process. The high temperature reaction is prone to coking, and lowering the temperature is not conducive to the conversion rate. (2) Studi...

Claims

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Application Information

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IPC IPC(8): B01J23/44C07C5/333C07C11/04
CPCB01J23/44C07C5/3337C07C2523/44B01J35/39C07C11/04Y02P20/52
Inventor 唐思扬李倩倩岳海荣刘长军梁斌
Owner SICHUAN UNIV
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