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Application of eggshell as catalyst for low rank coal gasification: Experimental and kinetic studies
Fan, Shumin,Xu, Li-Hua,Kang, Tae-Jin,Kim, Hyung-Taek Elsevier 2017 Journal of the Energy Institute Vol.90 No.5
<P>The objective of this research was to study effects of waste eggshells (ES) as a catalyst on the gasification of Indonesian sub-bituminous Komisi Pemilihan Umum (KPU) coal in a fixed-bed reactor under atmospheric pressure at three temperatures (700, 800, and 900 degrees C). With the ES catalyst, the highest H-2 yield of 1.24 mol-/mol-C (64 vol%) was obtained, an 80% increase compared with that of raw coal gasification without catalyst (0.69 mol-/mol-C). In addition, a CO yield of 0.34 mol-/mol-C was obtained, which is 31% higher than that of raw coal gasification (0.26 mol-/mol-C). Compared to raw coal gasification without catalyst, the ES catalytic gasification had higher syngas yield and reactivity. Through comparison, the best model for describing the reactivity of KPU coal with ES catalyst was the RPM (Random pore model) among the three gas solid reaction models adopted in this research. The RPM could adequately describe the conversion rate, giving an accurate prediction and explanation of the rate change during gasification. Rational kinetic parameters were determined from the RPM, which provided a basis for design and operation of a realistic system. (C) 2016 Energy Institute. Published by Elsevier Ltd. All rights reserved.</P>
Isolation of formaldehyde-degrading bacteria and the evaluation of the degradation characteristics
Menglei Wang,Shumin Xu,Shunyi Li,Rencheng Zhu 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.75 No.-
A formaldehyde-degrading bacteria strain, B1, was isolated. Strain B1 was characterized morphologically,physiologically and biochemically, and it was identified as Pseudomonas putida. Then, the formaldehydebiodegradation characteristics were evaluated in a biofilter. A formaldehyde removal rate above 90% wasmaintained when inlet loading was below 38.9 mg L 1 h 1. In addition, strain B1 quickly becamedominant bacteria when the reactor was restarted following a 30-days’ disruption, illustrating that thestrain is both adaptable and resilient. The numerical simulation results demonstrate that the maximumdegradation rates in the biofilter with strain B1 are betterfitted with the Haldane model.
강태진,박혜정,Hueon Namkung,Li-Hua Xu,Shumin Fan,김형택 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.4
Various methods are used in the coal gasification technology for increasing the efficiency of low rank coal to the level of high rank coal through catalytic gasification. The catalyst used in the catalytic gasification process lowers the activation energy required in the coal gasification reaction. Our purpose was to determine the characteristics of the reaction conditions for producing syngas and the characteristics for comparison catalytic pyrolysis and gasification performance. Among various coals, we used Indonesian low rank coals (Indonesian lignite, MSJ, and Roto South) characterized by a large deposit volume and low cost. Catalytic pyrolysis and gasification experiments were run under the same experimental conditions (reactor type, reaction temperature, catalyst content, and catalyst input method), and the characteristics were compared. Taking the conversion and heating values into consideration, the optimal conditions for catalytic gasification in this study were an H2O/C mole ratio of 10, temperature of 800 oC, and 10 wt% catalyst impregnation.
Mingyao Song,Zhengyang Duan,Ronggao Qin,Xiaojun Xu,Shuli Liu,Shumin Song,Mengjiao Zhang,Yue Li,Jiemei Shi 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.6
Xanthate-modified baker’s yeast (XMBY) was successfully synthesized by grafting xanthate groups onto the surface of baker’s yeast and was used for the simultaneous adsorption of cadmium (Cd2+) and methylene blue (MB) from aqueous solution. Scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) and Fourier transform infrared spectroscopy (FTIR) were used to characterize the synthesized adsorbent. The results indicated that the sulfur groups were successfully introduced onto the surface of the baker’s yeast and participated in the adsorption processes. The kinetic and isotherm data showed good correlations with the pseudo-second-order model and the Langmuir model, respectively. The equilibrium time and the maximum values obtained from the two models were 40 min, 239.8mg/g for Cd2+ and 300 min, 64.45mg/g for MB, respectively. The thermodynamic analysis (G<0, H>0, S>0) demonstrated that the adsorption processes of Cd2+ and MB onto the XMBY were endothermic and spontaneous. In the binary-component solution (Cd2+ and MB), the adsorption capacity for MB was almost unaffected by the presence of Cd2+ and interestingly, the adsorption capacity for Cd2+ increased in the presence of MB. Overall, these results indicated that XMBY could be a promising adsorbent for the treatment of wastewater containing both Cd2+ and MB.