An all-glass based micro gas chromatographic column for light hydrocarbon separation with HKUST-1 as stationary phase

ANALYTICA CHIMICA ACTA(2024)

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摘要
Background: The gas chromatography column is one of the key components of the gas chromatograph and typically be miniaturized using micro-electro-mechanical system (MEMS) technology. Due to the limited area of the Si wafer, the column length of micro gas chromatographic column (mu GCC) is usually much smaller than that of commercial chromatographic columns. Therefore, it is always difficult to use mu GCCs to separate small molecule gas components such as light hydrocarbons. More importantly, the heterogeneous microchannel surface formed by silicon glass bonding causes uneven stationary phase coating, further preventing the improvement of separation performance. Results: In this paper, a novel all-glass based mu GCC with 2 m length for the separation of light hydrocarbons is proposed. The microchannels of the mu GCC were directly prepared in the glass substrate by ultrafast laser assisted chemical etching (ULAE). The all-glass microchannels make the coating of the hydrophilic metal-organic frameworks (MOFs) stationary phase continuously because of the homogeneous material composition. There-fore, a widely used copper based hydrophilic MOFs HKUST-1 was used as stationary phase for coating and testing. The test results show that the mu GCC which is an open tubular column can realize the baseline separation of light hydrocarbons at 100 degrees C. And the resolution of difficult separated compounds, methane and ethane, can reach 12.98, which is 201.86 % higher than the silica-based monolithic capillary column in the relevant research. The resolution of ethane and ethylene reaches 6.81 at 120 degrees C. Significance: The mu GCC fabricated by ULAE method is composed of all-glass and has the uniform stationary phase coating because of the homogeneous microchannel surface which greatly improve the separation performance, resulting in a large resolution for methane and ethane. The all-glass mu GCC has broad application prospects in light hydrocarbon separation.
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关键词
Micro gas chromatographic column,Glass substrate,Metal-organic frameworks,HKUST-1,Light hydrocarbon separation
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