Modifying method and application of carbon nanotube catalyst

Abstract

The invention discloses a modifying method of a carbon nanotube catalyst. The modifying method includes following steps: 1), putting carbon nanotubes into a quartz boat, and putting the quartz boat into a discharging area of a high-voltage electrode and a grounding electrode of plasma treatment equipment; 2), filling initiating gas into the plasma treatment equipment, applying voltage between thetwo electrodes, adjusting pressure intensity of a plasma device, discharging, and treating for 1-30min to obtain a modified carbon nanotube catalyst. Interaction of high-energy active species of plasma and the carbon nanotubes is utilized to increase C=O functional groups with catalytic activity on the surfaces, the problem that conventional wet-process chemical modifying methods are harsh in process condition and long in period and cause environment pollution is avoided, and the operation process is simple and controllable; the catalyst is high in propane conversion rate and propane selectivity and presents excellent catalytic activity when being used in propane dehydrogenation reaction.

Description

technical field [0001] The invention relates to a catalyst preparation technology in the field of industrial catalysis, in particular to a modification method and application of a carbon nanotube catalyst. Background technique [0002] Propane dehydrogenation to propylene has become one of the important ways to increase the source of propylene. Platinum tin catalysts have high activity and good selectivity, and can withstand relatively harsh process conditions, but the precious metal platinum is expensive, resulting in high catalyst costs. Although the price of chromium-based catalysts is relatively cheap, such catalysts are prone to carbon deposition and deactivation, and must be regenerated every 15-30 minutes, and the use of chromium will also cause serious pollution to the environment. CN101972640A discloses an unloaded ordered mesoporous carbon material as a catalyst for propane dehydrogenation to propylene, which exhibits high catalytic activity, propylene selectivity...

AI Technical Summary

Problems solved by technology

However, the content of groups on the surface of carbon materials after high-temperature carbonization is low, which reduces the performance of the catalyst. Therefore, it is necessary to modify the carbon materials to increase the oxygen-containing functional groups on the surface.

The most commonly used method is to use chemical reagents for treatment. The defect is nitric acid treatment, which takes a long time and is easy to cause environmental pollution. Potassium permanganate solution treatment will leave metal ions remaining, which will affect the performance of the catalyst.

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