Micro device and modeling method for studying gas-solid intrinsic chemical reaction kinetics

Abstract

The invention discloses a micro device for studying gas-solid intrinsic chemical reaction kinetics. The micro device comprises a weighing component, a reactor component, a bracket and a three-directional switching valve, wherein the weighing component comprises a computer, a data acquirer, a strain gage, a glass protecting cover and a metal wire hook; the reactor component comprises a hollow quartz glass reactor, a metal hoisting basket, a heating furnace, a hollow quartz connecting part, a gas collection bag, a thermocouple and a temperature control box. The invention further provides a modeling method using the micro device. The modeling method comprises the following steps: on the premise that the influence caused by flowing such as internal and external diffusion is eliminated, firstly, confirming the conversion rate of a gas reactant and the yield of a multi-component gas product, and finally with the combination of change of the mass of solid test samples in different time periods, acquiring a gas-solid intrinsic chemical reaction kinetics model. By adopting the micro device disclosed by the invention, the problems that a conventional thermogravimetry device is small in test sample amount, a product cannot be quantified, the influence caused by internal and external diffusion is hard to eliminate, and the like are overcome, and a novel method for studying the gas-solid intrinsic chemical reaction kinetics is developed.

Description

technical field [0001] The invention belongs to the field of studying gas-solid intrinsic chemical reaction kinetics, and in particular relates to a micro-device and a modeling method for studying gas-solid intrinsic chemical reaction kinetics. Background technique [0002] The gas-curing chemical reaction is a very complicated process of physical diffusion and chemical reaction. When the gas-phase reactant contacts with the solid, a chemical reaction will occur to change the quality of the solid, and at the same time, gas-phase products will be released. [0003] In the existing research methods of chemical reaction kinetics, fixed bed / fluidized bed is generally used to study the gas-phase product release characteristics of gas-solid two-phase reaction and the change of solid properties, but real-time monitoring of the change of solid mass is difficult to achieve. Thermogravimetric analyzer (TGA) is a typical instrument that uses thermogravimetric method to detect the temp...

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Problems solved by technology

[0003] In the existing research methods of chemical reaction kinetics, fixed bed/fluidized bed is generally used to study the release characteristics of gas-phase products and the properties of solids in gas-solid two-phase reactions changes, and real-time monitoring of solid quality changes is difficult to achieve

Thermogravimetric Analyzer (TGA) is a typical instrument that uses thermogravimetric method to detect the temperature-mass relationship of substances, but it has some shortcomings in the study of gas-solidification chemical reaction kinetics: (1) The internal and external diffusion of gas has not been effectively co...

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