http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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>
Yuan, XiangZhou,Fan, ShuMin,Zhao, Liang,Kim, Hyung-Taek American Chemical Society 2016 ENERGY AND FUELS Vol.30 No.3
<P>The K2CO3-catalyzed steam gasification process of an Indonesian low-rank coal (Lanna coal) was studied, and the gasified residue was collected and used as a sample in the catalyst recovery process. The catalyst recovery process was mainly investigated by changing several operating parameters and washing methods, in order to evaluate the performance of the whole process. The shrinking core model was applicable to predict this gasification reactivity. H-2-rich syngas can reach 71.02 vol % at a gasification temperature of 800 degrees C with 20 wt % K2CO3 loading amount when the CO2 capture efficiency was 90%, and carbon conversion (X-C) reached 87.78% simultaneously. The potassium compounds in the gasified residue were found to coexist as K2CO3, K2SO4, and KAlSiO4. The optimal catalyst recovery efficiency (eta(K)) reached 84.69% by conducting three washes using the combined washing method. The variations of surface area, total pore volume, and average pore size under different washing methods were analyzed using Brunauer-Emmett-Teller and Barrett Joyner Halenda analyses after the catalyst recovery process was conducted. In addition, a new and advanced technology was developed that incorporates carbon capture, utilization, and storage with these two processes.</P>
RUIYONG WANG,SHUMIN FAN,RUIQIANG WANG,RUI WANG,HUANJING DOU,LVJING WANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.4
A sensitive and selective colorimetric biosensor for determination of gentamicin, amikacin and tobramycin was proposed with the unmodified gold nanoparticles (GNPs) as the sensing element. Gentamicin, amikacin and tobramycin can rapidly induce the aggregation of gold nanoparticles and is accompanied by a color change from red to blue. The concentration of gentamicin, amikacin and tobramycin can be determined by using UV-Vis spectrometer. The experimental parameters were optimized with regard to pH, incubation time and the concentration of the GNPs. Under optimal experimental conditions, the linear range of the colorimetric sensor for gentamicin/amikacin/tobramycin were 2.67–33.93 ng mL-1, 13.33–66.67 ng mL-1 and 20–180 ng mL-1, respectively. The corresponding limit of detection (3σ) was 0.354 ng mL-1, 0.999 ng mL-1 and 0.579 ng mL-1, respectively. This assay was simple and used to detect aminoglycoside antibiotics in milk and medicine products.
Yuan, XiangZhou,Fan, ShuMin,Choi, Seung Wan,Kim, Hyung-Taek,Lee, Ki Bong Elsevier 2017 APPLIED ENERGY Vol.195 No.-
<P>In this study, after conducting K2CO3-catalyzed steam gasification in a bench-scale bubbling fluidized bed reactor, the bench-scale recovery process of potassium catalyst was investigated by changing washing methods and operating parameters. The optimal potassium catalyst recovery efficiency (eta(k)) from MSJ gasified residue was 87.62%, achieved by utilizing a combined washing method in which the first wash was performed with N-2 limewater (0.25 mol ratio of Ca/K) and the last two washes were with CO2 water. The recovered potassium catalyst was re-loaded with MSJ coal and then was utilized for conducting the catalytic steam gasification in a lab-scale fixed bed reactor, in order to evaluate the performance of the recovered potassium catalyst from both experimental and kinetic aspects. Compared with the results obtained from fresh K2CO3, not only the trends of carbon conversion (X-c) were similar at each gasifying temperature, but also there was no obvious difference in volume percentage of gases produced. When the random pore model (RPM) was adopted, both reaction rate constant (K-RPM) and activation energy (Ea) remained similar. In addition, the lifecycle of the recovered potassium catalyst was studied. Finally, it can be concluded that the potassium catalyst was effectively and efficiently recovered from gasified residue and the recovered potassium catalyst had the same catalytic activity as fresh K2CO3, promoting the commercialization and development of the catalytic gasification process. (C) 2017 Elsevier Ltd. All rights reserved.</P>