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【期刊论文】Floating double probe characteristics of non-thermal plasmas in the presence of zeolite
刘昌俊, Chang-jun Liu a, b, *, Jia-xin Wang c, Kai-lu Yu a, Baldur Eliasson d, Qing Xia b, Bingzhang Xue d, Yu-hang Zhang a
Journal of Electrostatics 54(2002)149-158,-0001,():
-1年11月30日
The combination of catalyst and non-thermal plasmas has led to some unusual chemical behaviors, especially with zeolite catalyst. A mechanism has been proposed to explain the observed interaction between catalyst and non-thermal plasmas. This mechanism includes two aspects: plasma promoted or induced catalysis and catalyst enhanced non-equilibrium of nonthermal plasmas. In this paper, we present some direct experimental evidence for the catalyst (zeolite)-enhanced non-equilibrium of non-thermal plasmas suggesting the use of zeolite increases, significantly, the electron temperature of non-thermal plasmas, while the gas temperature remains unchanged. A floating double-probe characteristic has been utilized to measure the electron temperature. Compared to the case without zeolite, the electron temperature of non-thermal plasmas with Mo-Zn/HZSM-5 increases up to 250%, while, at the same time, the discharge power reduces 58%, compared to that without zeolite. r 2002 Elsevier Science B.V. All rights reserved.
Non-thermal plasma, Glow discharge, Double-probe characteristic, Zeolite, Plasma chemical processing, Langmuir probe
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刘昌俊, Chang-Jun Liu, , Bingzhang Xue, Baldur Eliasson, Fei He, Yang Li, and Gen-Hui Xu
Plasma Chemistry and Plasma Processing, Vol. 21, No.3, 2001,-0001,():
-1年11月30日
Experimental in
Methane, carbon dioxide, higher hydrocarbon, dielectric barrier discharge.,
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【期刊论文】Characterization of plasma treated Pd/HZSM-5 catalyst for methane combustion
刘昌俊, Chang-jun Liu a, b, *, Kailu Yu a, Yue-ping Zhang b, Xinli Zhu a, Fei He a, Baldur Eliasson c
Applied Catalysis B: Environmental 47(2004)95-100,-0001,():
-1年11月30日
In this work, a novel glow discharge plasma treatment of Pd/HZSM-5 catalyst, followed by calcination thermally, has been conducted. Such prepared catalyst presents a higher catalytic activity and an enhanced stability over the catalyst prepared without plasma treatment. The methane conversion over the plasma treated catalyst is close to 100% at 450℃, but it is only ca. 50% at the same temperature over the catalyst without plasma treatment. The XPS, H2 chemisorption and XRD characterizations confirm an enhanced dispersion has been achieved with the plasma reduction (during treatment) followed by oxidation (during calcination). Upon FT-IR analyses, the plasma treatment, followed by calcination thermally, also leads to enhanced Brönsted and Lewis acidities. The amount of Brönsted acid sites of the plasma treated Pd/HZSM-5 catalyst is 1.13 times larger than that of the catalyst without plasma treatment, while the amount of Lewis acid sites of the plasma treated Pd/HZSM-5 catalyst is 1.21 times higher. The enhanced acidities are definitely helpful to increase the dispersion of PdO over the support and improve the interaction between PdO and HZSM-5 support, which leads to a remarkable improvement in the catalyst stability.
Plasma treatment, Glow discharge, Pd/, HZSM-5, Methane combustion
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刘昌俊, Yang Li, †, ‡ Chang-Jun Liu, *, ‡ Baldur Eliasson, ‡, § and Yu Wang†
Energy & Fuels 2002, 16, 864-870,-0001,():
-1年11月30日
In this work, a direct conversion of methane in the presence of carbon dioxide using dielectricbarrier discharge plasmas has been conducted. The product includes syngas (H2 and CO), gaseous hydrocarbons (C2 to C5), liquid hydrocarbons (C5 to C11+), and oxygenates. The liquid hydrocarbons are highly branched, representing a high octane number, while the oxygenates mainly consist of series of alcohols and acids. A detailed analysis of product distribution has been performed under variable feed conditions with different reactor configurations. At the high CH4/CO2 feed ratio, the wider discharge gap (1.8mm) is more favored for the formation of methanol and ethanol. For the production of acetic acid, the narrower discharge gap (1.1mm) is better, especially, with the existence of after-glow zones. Conditions favored for the production of acetic acid are also good for the production of liquid fuels.
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刘昌俊, Yang Li, † Gen-hui Xu, † Chang-jun Liu, *, † Baldur Eliasson, ‡ and Bing-zhang Xue‡
Energy & Fuels 2001, 15, 299-302,-0001,():
-1年11月30日
The effect of electrode materials on the co-generation of syngas and higher hydrocarbons from CO2 and CH4 using dielectric-barrier discharge has been investigated. The electrode materials tested here include aluminum, copper, steel, and titanium. For the feed of methane in the absence of CO2, the order of activity of methane conversion from high to low was Ti≈ Al > Fe > Cu, while the order of the activity of CO2 conversion was Al > Cu > Ti > Fe for the case of CO2 feed without methane. Regarding the co-feed of methane and CO2, the titanium electrode shows the best activity for the conversions, while the other three materials show a similar performance for the conversions. The effect of dilution gas, helium, on the conversions has also been discussed.
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