Fast On-line sampler with sample feeding for multi-channel gas and catalyst performance determining system

Abstract

An on-line quickly sampling and sample feeding device of multichannel gas consists of gas sampling unit formed by gas pipeline, multiple solenoid valves and a microdiaphragm vacuum pump; an fully-automatic six-way valve for feeding gas sample automatically; pipeline washing unit formed by a gas washing bottle and multiple solenoid valves; control unit formed by multiple switches being controlled manfully or being controlled automatically by computer .The property evaluating system of catalyst by utilizing said device is also disclosed .

Description

Technical field [0001] The invention belongs to a catalytic chemistry experimental device, which relates to the real-time sampling and sampling of reactants or products in the detection process of catalyst performance, and particularly relates to a multi-channel gas fast online sampling and sampling device and a catalyst performance evaluation device formed by the device System, the device and system can be widely used for the performance evaluation of catalysts involving gas reactants and products, and can also be used for the kinetic study of general chemical reaction processes involving gas reactants and products. Background technique [0002] In the field of catalysis, the development and rapid screening of high-efficiency catalysts are of great significance to researchers. Among the natural and synthetic compounds, there are many compounds with catalytic activity. However, due to the lack of effective catalytic performance rapid evaluation equipment an...

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Problems solved by technology

The experimental methods in the published literature are generally carried out in a reactor. The changes in the concentration of various reactants and products during the reaction are studied by using a single sampling and injection system, and only one compound can be studied at a time. Catalytic performance under one working condition, the research efficiency is low

As reported in "J Membrane Science Journal" (J Membrane Science) 206 (2002) 399-415 in the field of photocatalysis, "Studies on Various Reactors for Water Purification Coupled Photocatalysis and Membrane Treatment" (Studies on various reactor configurations for coupling photocatalysis and membrane processes in water purification) reviewed several photocatalytic water treatment systems, such as "Environ.Sci.Technol.; 2005; 39(17); 6871- 6876) reported thermocatalytic reaction system; in bioenzyme catalysis such as the bioenzyme reaction system reported in "Chemical Research" (Ind.Eng.Chem.Res, 2000,39(4), 909-915) Microwave Catalytic Continuous Reaction Experimental System reported in Journal of Chemical Society (J.Am.Chem.Soc., 2005, 127, 8160~8167), Physical Chemistry (J.Phys.Chem.B, 2003, 107, 3091~ 3094), the ultrasonic-assisted catalytic reaction system and so on only use one reactor, adopt a single sampling and sampling system, and can only evaluate the catalytic performance of one catalyst under one working condition at a time. very inefficient for screening

In 2004, the applicant applied for a multi-channel photocatalytic performance rapid evaluation device based on the inorganic hydrogen sensing film (application publication number CN-1570612A), which is used to quickly evaluate and screen the photocatalytic performance of a large number of compounds, so as to select Discovered new photocatalysts, but this type of evaluation system is an indirect evaluation system, which cannot realize real-time online evaluation of catalysts. At the same time, this device can only evaluate the performance of photocatalysts with hydrogen concentration changes during the reaction process, and the scope of application is limited.

To achieve rapid screening of catalysts, it is necessary to build a multi-channel gas sampling and sampling system, so that one chromatograph can be used to simultaneously analyze the catalytic performance of multiple catalysts or the catalytic performance of the same catalyst under different working conditions. Real-time online detection, according to the data retrieval conducted by the applicant, there is no report on the multi-channel gas rapid online sampling, sampling device and catalyst performance evaluation system that can be connected to the gas chromatograph at home and abroad.

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