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Yingliang Tian,Wencai Liu,Yongqiang Lu,Shibing Sun 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.5
La1-xSrxMnO3-α(LSMO) and LaMnO3+α(LMO) nanoparticle catalysts have been synthesized via a one-step molten salt route. It was found that the partial substitution of lanthanum by strontium had a promoting effect on the catalytic performance for toluene oxidation. Under the condition of toluene concentration=1000 ppm, toluene/O2 molar ratio=1/200 and the space velocity=20000 mL/(g h), the temperature required for 50% and 90% toluene combustion conversion was 150℃ and 205℃ over LSMO catalyst, respectively. It is concluded that the oxygen vacancy, the molar ratio Mn4+/Mn3+ on the surface and the specific surface area contribute to the improved catalytic performance of the LSMO nanoparticle materials via a one-step molten salt method.
Fiber Ring Laser Intra-cavity Absorption Spectroscopy for Gas Sensing: Analysis and Experiment
Mo Li,Kun Liu,Wencai Jing,Gang-Ding Peng 한국광학회 2010 Current Optics and Photonics Vol.14 No.1
Fiber ring laser based intra-cavity absorption spectroscopic sensor has great potential for high sensitivity gas detection. Using the rate equations and propagation equations, we investigated theoretically factors that affect the sensitivity of such fiber ring laser sensors and determined the optimal design parameters and conditions for significant enhancement of the system sensitivity. Experiments have been conducted to determine the sensitivity enhancement performance. The results showed a factor of 25 ~ 30 in sensitivity enhancement in the experimental system, agreeing well with the theoretical expectations. Experiments on acetylene detection have also been carried out and the results showed that the ring cavity significantly increases the signal absorption and that high sensitivity can be obtained for gas detection.