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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.
Yan Song,Jingcheng Wang,Yuanhao Shi,Chuang Li 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.5
This paper is concerned with H_∞ control of networked control systems (NCSs) with both network-induced delay and packet disordering taken into account. A switching-based method depends on different cases of prediction numbers is presented to model the NCSs as a switched system. With the application of an improved prediciton-based method to compensate for the time delay and packet disordering, H_∞ controller is designed by solving the linear matrix inequalities (LMIs). The proposed method can be applied variously due to all kinds of prediciton numbers of the consective disordering packet have been considered, which means that our techniques are less conservative than existing lit-eratures. Finally numerical examples and simulations are used to illustrate the effectiveness and valid-ity of the proposed switching-based method and the improved prediction-based H∞ controller design synthesis.