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Deep dechlorination of hydrocarbon oil by reactive adsorption on TiO2-based metal oxides
Hui Niu,Yuyu Feng,Jie Ding,Wei Zhang,Chenxing Hu,Qingxiang Zhang,Chen Zhang,Cuiqing Li 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7
This study reports reactive adsorptive dechlorination of hydrocarbon oil over TiO2-based metal oxides atthe temperatures of 20-150 oC. TiO2 and a series of TiO2-CeO2 were prepared by precipitation method and characterizedby N2 adsorption, XRD, FT-IR, pyridine-IR, NH3-TPD and CO2-TPD. The characterization results showed thatboth the acidity and basicity of the adsorbent had a significant impact on its dechlorination capacity. TiO2-U precipitatedby urea exhibited higher dechlorination capacity than TiO2-A precipitated by ammonia due to the higher surfacearea, more acid and base amounts of the former. Among various Ti(1x)CexO2 (x=0.1, 0.3, 0.5, 0.7, 0.9, 1) oxides,Ti0.7Ce0.3O2 and Ti0.3Ce0.7O2 bimetallic oxides showed higher dechlorination capacity than TiO2-U, and the chlorineremoval over Ti0.7Ce0.3O2 reached 82.8% after adsorption at 150 oC for 3 h. Mixing 5 wt% of alkali earth metal oxideinto Ti0.7Ce0.3O2 mechanically enhanced its dechlorination capacity, and the chlorine removal over Ti0.7Ce0.3O2-BaOreached as high as 92.1%. The chlorine removal increased with increasing the adsorption temperature. Ion chromatographyand GC-MS analysis revealed that organochlorine compound was converted into Cl and its corresponding alcoholover the adsorbent at 150 oC. Finally, the mechanism of reactive adsorption dechlorination was proposed.
Analyzing the Impact of the Internet on Higher Education
Renjie Zhou,Dongchen Xia,Yuyu Yin,Jilin Zhang,Wei Zhang,Jin Feng 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.6
The Internet has gone deeply into nowadays college students’ life, and has become an important platform for students to study, entertainment, and build social relationships. In this paper, we study the patterns of how college students use the Internet, and analyze the potential impacts of Internet on the living and education of college students. We find that 95% of college students spend more than two hours online per day. Academic and career development is the top motivation for college students to use the Internet. However, high percentage of the college students is not able to control their usage of the Internet well, which leading to recognition that the Internet is a negative factor that affects their course performance. The findings are helpful for educators to guide students to use Internet in a reasonable way and to find ways to make the Internet to be conducive to high quality of higher education.