Method and device for capturing free radicals in transient state generated by discharge of plasma in low temperature

Abstract

A method for gathering transient free radical generated by low temperature plasma discharge includes reacting transient gas phase free radial generated by low temperature plasma coronal discharge with spin gathering agent in solution to form spin additive matters under average electric field intensity of 4-10kv / cm, taking 0.1-0.2mL gathering solution after reaction and filling said solution in quarts sample bottle for carrying out detection by spin resonator, using ESR spectral line form of spin additive matters to confirm type of free radical and using spectral line signal intensity to confirm content of free radical.

Description

technical field [0001] The invention relates to a method and device for trapping transient free radicals generated by low-temperature plasma discharge. Background technique [0002] Free radicals are intermediates in many chemical reaction processes, and the isolation and identification of these active organic reaction fragments or reaction intermediates is very important for understanding and proving the reaction mechanism. However, due to its very active nature and extremely short lifetime (ns level), it may soon undergo further redox reactions to generate diamagnetic substances, so effectively trapping free radicals is the focus and difficulty of research work. [0003] The process of low-temperature plasma discharge treatment of exhaust gas or chemical synthesis is mainly that high-voltage corona excites gas molecules to generate free radicals and other strong oxidizing substances that act on compounds in the treatment of exhaust gas or chemical synthesis. Therefore, ac...

AI Technical Summary

Problems solved by technology

[0007] However, the above trapping technologies all capture and detect free radicals in the liquid phase. There are few reports on the trapping methods of gas phase free radicals at home and abroad, especially the various transient gas phases produced in low temperature plasma reactions. free radical

In atmospheric chemistry, laser fluorescence spectroscopy and long-path absorption spectroscopy are mainly used. These methods have high requirements for the matching of free radical generators and detection instruments, and the operation is complicated. The measured spectral lines are complex and difficult to identify. Quantitative Difficulty, resulting in its application is greatly limited

Images