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• W2334414786 abstract "The study established a new method of identifying different ether vapors by detecting the cataluminescence (CTL) intensities of both ether vapors and its reaction residual gas (including undecomposed analytes and reaction products) on two catalytic materials. In our work, we designed a sensor system: two cylindrical ceramic heaters (inner diameter=4 mm, length=8 cm) sintered with nanosized MgO or ZrO2 about 0.2 mm thick on the surface were placed into two quartz tubes (diameter=1 cm, length=10 cm) respectively (the catalytic materials could be the same or different on two ceramic heaters. Two quartz tubes were connected by a polytetrafluoroethylene (PTFE) tube (35 m×0.4 mm×0.3 mm) which en- sured that the signal peaks of each ether vapor and its reaction residual gas could be separated. Four kinds of ether vapors (dimethyl ether, ethyl ether, isopropyl ether and n-butyl ether) were investigated in the sensor system. Firstly, CTL signal I1 was generated when each ether vapor passed through nano-MgO or ZrO2 (the first order reaction). Then residual gas from first reaction was regarded as a new reactant and continued to be oxidized on nano-MgO or ZrO2, generating new CTL signal I2 (the second order reaction). The CTL signals were measured using a photomultiplier in the BPCL Ultra Weak CTL Ana- lyzer, and the data was processed by Origin 7.5. It was found that for each ether vapor the ratio of luminescent response sig- nals (I1/I2) was constant despite different concentrations of ether vapor under the optimal conditions of wavelength of 425 nm, temperature of 240 , and flow rate of ℃ 220 mL/min. Therefore the sensor could identify and distinguish different ether vapor. In the research, we obtained four groups of I1/I2 values for each ether vapor by changing the direction of gas flow passing through ZrO2 or MgO (four groups: MgO-MgO, MgO-ZrO2, ZrO2-ZrO2 and ZrO2-MgO). According to different luminescent intensity ratios of ether vapor on different combinations of sensitive materials, we could enhance the sensor's capacity of distinguishing different kinds of ether vapor by collecting multidimensional data and information. The linear range of four ether vapors was 50~1000 ppm and the detection limits were below the allowable concentration of ether vapor in the air. Furthermore, some common pollutants in the air such as formaldehyde, benzene, toluene and ammonia would not affect the results of the analysis. This method could quickly and easily identify different ether vapors. Meanwhile, the resid- ual gas of dimethyl ether from both first and second order reactions on MgO-MgO surface were analyzed by gas chromato- graph to demonstrate the possible mechanism of the CTL reaction in this sensor." @default.
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• W2334414786 date "2013-01-01" @default.
• W2334414786 modified "2023-10-13" @default.
• W2334414786 title "A Sensor System for Identifying Ether Vapors Based on Extracting Two-stage Cataluminescence Signals" @default.
• W2334414786 doi "https://doi.org/10.6023/a13050572" @default.
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