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Featured researches published by Wenwen Qu.


High Temperature Materials and Processes | 2013

Dielectric Properties and Microwave Heating Characteristics of Sodium Chloride at 2.45 GHz

Chenhui Liu; Libo Zhang; Jinhui Peng; Wenwen Qu; Bingguo Liu; Hongying Xia; Junwen Zhou

Abstract The effects of moisture content and temperature on the dielectric property of sodium chloride were investigated by using open-ended senor dielectric measurement system at the frequency of 2.45 GHz. Moisture content is a major influencing factor in the variation of dielectric properties. Dielectric constant, loss factor and loss tangent all increase linearly with moisture content increasing. Three predictive models were developed to obtain dielectric constant, loss factor, loss tangent and of sodium chloride as linear functions of moisture content. Temperature between 20 °C and 100 °C has a positive effect on dielectric constant and loss factor. Penetration depth decreased nonlinearly with moisture and temperature increasing. A predictive model was developed to calculate penetration depth for sodium chloride as a fifth function of moisture content. In addition, the measurements indicate that the particles temperature increases linearly with microwaving heating time at different power levels. The knowledge gained from these results is useful in developing more effective applications of microwave drying and designing better sensors for measuring moisture content of sodium chloride.


Ultrasonics Sonochemistry | 2018

Ultrasound-assisted oil removal of γ-Al2O3-based spent hydrodesulfurization catalyst and microwave roasting recovery of metal Mo

Lu Wang; Liu Chao; Wenwen Qu; Shengming Xu; Libo Zhang; Jinhui Peng; Xiaolei Ye

Currently, roasting-leaching is the main treatment process of spent hydrodesulfurization (HDS) catalyst, but it will produce impurities, such as nickel molybdate and cobalt molybdate (NiMoO4 or CoMoO4), which is adverse to recover valuable metals. In this paper, a combined ultrasonic-microwave method was developed to remove oil and recover molybdenum (Mo) from the spent HDS catalyst. Firstly, ethanol was used to extract the surface oil of the spent MoNiCo/Al2O3 catalyst with ultrasonic assistance. Effects of temperature, ultrasonic time, liquid-solid ratio and ultrasonic power on the oil removal rate were investigated systematically and the process conditions were optimized using response surface methodology (RSM). The results showed that the oil removal rate was over 99% under the optimum conditions of temperature 55 °C, ultrasonic time 2 h, liquid to solid ratio 5:1, and ultrasonic power 600 W. After oil removal, the sample was roasted in microwave field at 500 °C for 15 min. The generation of toxic gas could be effectively avoided and no hardest-to-recycle impurity CoMoO4 was found. At last, the roasted sample was subjected to ultrasonic leaching with sodium carbonate (Na2CO3) solution for recovering Mo. Extraction of Mo of the deoiled sample after microwave roasting reached 94.3%, which is about 7% higher than that of oily sample. Moreover, microwave roasting method resulted in a much higher Mo extraction than traditional method for both the oily and deoiled spent catalyst. It was concluded that the ultrasonic-microwave assisted method could remarkably improve the recovery of Mo and greatly shorten the processing time.


Desalination | 2009

Comparison between microwave and conventional thermal reactivations of spent activated carbon generated from vinyl acetate synthesis

Zhengyong Zhang; Wenwen Qu; Jinhui Peng; Libo Zhang; Xiangyuan Ma; Zebiao Zhang; Wei Li


Journal of The Taiwan Institute of Chemical Engineers | 2009

Regeneration of high-performance activated carbon from spent catalyst: Optimization using response surface methodology

Zhengyong Zhang; Jinhui Peng; Wenwen Qu; Libo Zhang; Zebiao Zhang; Wei Li; Rundong Wan


Coloration Technology | 2012

Thermal regeneration of spent coal-based activated carbon using carbon dioxide: process optimisation, Methylene Blue decolorisation isotherms and kinetics

Xinhui Duan; Chandrasekar Srinivasa Kannan; Wenwen Qu; Xin Wang; Jinhui Peng; Libo Zhang; Hongying Xia


Desalination and Water Treatment | 2016

Microwave-assisted regeneration of spent activated carbon containing zinc acetate and its application for removal of congo red

Wenwen Qu; Qiong Hu; Yi Zhu; Jinhui Peng; Libo Zhang


Archive | 2008

Preparation method of active carbon supported with zinc oxide

Jinhui Peng; Zhengyong Zhang; Libo Zhang; Zebiao Zhang; Wenwen Qu; Liexing Zhou


Archive | 2012

Method for preparing mesoporous activated carbon by regenerating waste coal-based activated carbon through microwave heating

Libo Zhang; Xin Wang; Xinhui Duan; Jinhui Peng; Wenwen Qu; Hongying Xia


Archive | 2008

Regeneration method of dead catalyst

Jinhui Peng; Rui Jie; Libo Zhang; Zhengyong Zhang; Liexing Zhou; Wenwen Qu; Wei Li; Ning Li; Bingguo Liu


Archive | 2008

Compound depurative preparing method for removing methanol from air

Jinhui Peng; Tiancai Qian; Liexing Zhou; Libo Zhang; Shaohua Wang; Wenwen Qu; Zhengyong Zhang; Wei Li; Zebiao Zhang; Shenghui Guo; Shimin Zhang; Rui Xie; Bingguo Liu

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Jinhui Peng

Kunming University of Science and Technology

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Libo Zhang

Kunming University of Science and Technology

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Bingguo Liu

Kunming University of Science and Technology

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Zhengyong Zhang

Kunming University of Science and Technology

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Wei Li

Kunming University of Science and Technology

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Zebiao Zhang

Kunming University of Science and Technology

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Liexing Zhou

Kunming University of Science and Technology

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Shenghui Guo

Kunming University of Science and Technology

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Hongying Xia

Kunming University of Science and Technology

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Xinhui Duan

Kunming University of Science and Technology

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