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Adsorption of carbon dioxide and water vapor on fly-ash based ETS-10
Yushun Wang,Tao Du,Tao Du,Xin Fang,Gang Li,Liying Liu 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.8
CO2 capture from humid flue gas is always costly due to the irreplaceable pretreatment of dehydration in current processes, which creates an urgent demand for moisture-insensitive adsorbents with considerable CO2 uptakes as well as remarkable H2O tolerances. In the present work, the microporous titanium silicate molecular sieve ETS-10 was synthesized with coal fly ash as the only silica source. The as-synthesized ETS-10 was characterized by X-ray diffraction, scanning electronic microscopy and infrared spectroscopy to verify its crystal morphology, in which neither impurity nor aggregation was observed. The following CO2 adsorption experiments on the thermal gravimetric analyzer demonstrated its similar CO2 adsorption capacity yet dramatical adsorption kinetics among some other microporous materials, e.g., potassium chabazite. These specific properties consequently guaranteed its favorable CO2 adsorption capacity even at high temperatures (1.35mmol/g at 393 K) and shortened the breakthrough time of single CO2 flow to less than 20 s. In CO2/H2O binary breakthrough experiments, the as-obtained ETS-10 still maintained excellent CO2 uptake of 0.81mmol/g at 323 K, regardless of the presence of water vapor, making it a promising substitute for direct CO2 separation from humid flue gases at practical conditions of post-combustion adsorption.
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( Wang Kuner ),( Huang Yushun ) 성균관대학교 유교문화연구소 2011 儒敎文化硏究(中文版) Vol.0 No.15
本文是對中國詩學基本范疇“比興”與朱熹《詩集傳》的專題硏究, 然而意在儒學本身的本源觀念的澄淸。朱熹的詩學思想其實是儒學的一種形而上學建構, 這種精致的哲學建構將儒家形而上學推向了歷史的高峰, 但同時也蔽塞了孔子“比興”觀念對于儒學的本源意義。本文旨在通過對朱熹詩學的重新認識和批評, 還原儒家詩學的本眞面目, 從而回到孔子儒學的本源觀念。 The thesis is the research about the basic category of Chinese poetics-“analogy(比) and rise(兴)” and Zhu Xi’s Variorum of the Book of Songs. However, the gist of the thesis is to clear the original ideas of Confucianism itself. Zhu Xi’s thought of poetics is actually a construction of Confucian metaphysics, this exquisite construction has push the Confucian metaphysics to the climax of history, while on the other hand, blocking the original sense of “analogy and rise” of Confucius to Confucianism. The thesis aims at reduction of Confucian poetics, thus coming back to the original idea of Confucianism of Confucius, through recognizing and criticizing Zhu Xi’s poetics. [Article in Chinese]
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Synthesis of fly ash-based microporous copper silicate for CO2 capture from humid flue gases
Liying Liu,Xudong Chen,Yushun Wang,Tao Du,Gang Li 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.3
Conventional microporous adsorbents suffer from CO2 adsorption capacity reduction due to the presence of water vapor in real flue gases. Therefore, development of low-cost moisture-insensitive adsorbents is of great significance. In the present work, microporous copper silicate was synthesized from waste fly ash for the first time. The synthesis conditions were further optimized to obtain copper silicates with high purities. The as-synthesized product was characterized in terms of structural morphology, chemical composition, and surface properties. The CO2 and H2O adsorption properties of the prepared copper silicate were also investigated by single-component isotherm measurements and dynamic CO2/H2O binary breakthrough experiments. The results show that the as-synthesized fly ash-based copper silicate exhibited excellent CO2 adsorption properties even in the presence of water vapor, thus demonstrating promising potential as a moisture-insensitive adsorbent for directly capturing CO2 from humid flue gases.
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Observer-based Admissible Control for Singular Delta Operator Systems
Xin-zhuang Dong,Mingqing Xiao,Yushun Wang,Wenxue He 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
This paper studies the problem of designing an observer-based admissible controller for singular delta operator systems. Sufficient conditions are provided for the existence of an asymptotical and physically realizable observer. Then an observer-based admissible controller is obtained in terms of strict linear matrix inequalities. The corresponding gain matrices appeared in our proposed approach can be constructed through the feasible solutions of a set of linear matrix inequalities. Some numerical examples are presented to demonstrate the theoretical outcomes of the paper.
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