Chemical kinetics testing method by adopting dynamic admittance spectroscopy instrument

Abstract

Disclosed is a chemical kinetics testing method by adopting a dynamic admittance spectroscopy instrument, wherein the dynamic admittance spectroscopy instrument includes the following parts: a signal generator (1), a chemical reactor and signal generator interface (2), a data acquisition circuit and measurement circuit (3), an acquisition-measurement circuit and computer interface (4), a data processing and display device (5). The signal generator (1) generates excitation signals in real time, and the excitation signals enter a chemical reactor (6) through the chemical reactor and signal generator interface (2); the data acquisition circuit and measurement circuit (3) performs real-time measurement and acquisition on signals outputted in two channels and the acquisition-measurement circuit and computer interface (4) transmits the processing result into a computer; and finally the data processing and display device (5) performs data processing and display. Due to very small amplitude of the excitation signals, voltage output needs to be amplified for performing data acquisition and processing in order to detect the weak signals, and the processing result is transmitted to the computer through a communication interface for subsequent processing, and the measurement result is displayed and stored at last.

Description

technical field [0001] The invention belongs to the field of macroscopic chemical dynamics instruments. Through real-time measurement of the change of conductance and capacitance during the reaction process of the chemical reaction system, the function curve of the concentration of the substance in the reaction system with the reaction time is obtained, and then the chemical kinetic equation is obtained. Background technique [0002] Chemical kinetics is one of the most important research contents in the field of chemistry. Through research methods such as molecular beams and lasers, chemical kinetics has advanced to the level of elementary reactions, and the transition states and resonance states of specific reactions can be studied. However, for actual chemical production or experimental research, the microscopic state is usually not considered, but the specific kinetic equation needs to be obtained, so the macroscopic dynamics is more practical. Specific to organic chem...

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Problems solved by technology

[0008] From an instrument point of view, the existing impedance spectrometer is not designed for dynamic testing and cannot meet the needs of fast dynamic testing

The disadvantages mainly include: 1) the data acquisition rate is relatively slow, and the measurement frequency is usually tens of MHz; 2) more importantly, the frequency switching rate of the existing impedance spectrometer is slow, and during dynamic testing, it is required to operate within a very short Frequency switching within a short time requires a very high frequency switching rate

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