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Guangyu Shi,Yuanhao Wang,Yafeng Cao,Weijie Cai,Fengzhi Tan 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.12
A Ni/Ce0.8Zr0.2O2 catalyst (NiCeZr-N) was synthesized by a facile co-nanocasting technique for syngas production from ethanol dry reforming. In addition, a series of characterization techniques, such as transmission electron microscopy (TEM), X-ray diffraction (XRD), inductive coupled plasma Emission Spectrometer (ICP), X-ray photoelectron spectroscopy (XPS), Raman and hydrogen temperature programmed reduction (H2-TPR) were selected to evaluate the physicochemical features of the as-prepared catalysts. Indeed, the results indicated that NiCeZr-N catalyst prepared by co-nanocasting method had a smaller particle size (<5 nm), relatively higher specific surface area (39m2/g) and stronger metal-support interaction in comparison with another model catalyst obtained from conventional co-precipitation method (NiCeZr-P). Expectedly, these positive factors enabled NiCeZr-N catalyst to exhibit better activity and stability. Typically, ethanol is completely converted by using NiCeZr-N as catalyst and heating to 700 oC, and CO2 conversion was as high as 65.3%. Interestingly, H2/CO was close to 1.1 at 650 oC, which could be used as feedstocks of Fischer-Tropsch process. Particularly, no obvious fluctuation of ethanol conversion and the product selectivity was observed during 40 h time-on-stream stability test.
Jun Zhou,Anyuan Fan,Cha Hyungki,Dong Liu,Dukhyeon Kim,Fudi Qi,Guangyu Shi,Guming Yue 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.1
A Mie lidar has been used to make observations of Asian dust over Hefei (31.90 N, 117.16 E) in the every spring month since the year of 1998. This paper presents the main features of the vertical distribution and the temporal variation of the Asian dust extinction coefficient at a 532-nm wavelength during seven years. There were two kinds of vertical distributions of Asian dust extinction coefficients. One kind of distribution indicated that the Asian dust particles intruded into the local boundary layer, causing a very thick dust layer with depth of about 3 4 km. The other one showed that the Asian dust passed over Hefei area above the boundary layer. The aerosol extinction coefficients in the elevated dust layer within the middle troposphere from 3 to 6 km were unusually large. Seasonally averaged aerosol extinction coefficient profiles showed that larger aerosol extinction coefficients were observed in the altitude range from 1 km to 10 km in the springtime than in any other season.쯢