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RISS 인기검색어
- 검색키워드
- 저자 : Somaiyeh Allahyari (검색결과 3 건)
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Nooshin Parvizi,Nader Rahemi,Somaiyeh Allahyari,Minoo Tasbihi 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.84 No.-
Volatile organic compounds, as an emerging group of organic pollutants, have significant harmful effectson both human health and the environment. BTX, which consists of benzene, toluene and xylene, is themost important kind of these compounds, which is extensively produced in the oil and gas industry. Todate, various treatment methods have been used to remove volatile organic compounds. Among them,the non-thermal plasma technology has attracted more attention as an efficient technology for theremoval of VOC compounds due to its numerous advantages. perovskite-type metal oxides have recentlybeen found to be effective catalysts for the total oxidation of VOCs. This research has been conducted intwo steps. In thefirst step, a series of La0.8A0.2MnO3 (A: Co, Zn, Mg, Ba) nano-catalysts were synthesizedby sol-gel method and then their catalytic activity for removal of BTX compounds were investigated in anon-thermal hybrid plasma system with the dielectric reactor, among which La0.8Zn0.2MnO3 was themost active catalyst. In the next step, further studies focused on zinc doped perovskite nanocatalysts. Thecatalytic activity of La1-xZnxMnO3 (x = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6) nanocatalysts was investigated whereLa0.8Zn0.2MnO3 catalyst showed highest removal efficiency by degradation 89.73% of benzene, 88.98% oftoluene and 88.66% of xylene. It should be noted that product analysis was performed using GC analyzer. The effect of operating parameters such as plasma voltage, activation time, the amount of catalyst loadingon optimal sample catalyst and airflow rate were further evaluated. The results exhibited that increasingplasma voltage, activation time and the amount of catalyst loading and PDC use will develop degradationpercentage, reduce airflow rate and increase the process time. The physical and chemical properties ofperovskite nanocatalysts were evaluated using XRD, SEM, EDX, FTIR, DRS, BET, TEM and SAED analyses. The XRD results suggested that all the samples demonstrated a typical pure perovskite phase. SEManalysis results confirm the formation of nanostructured catalysts and EDX analysis exhibited a gooddispersion of elements in optimal photocatalyst. The FTIR results showed that all the characteristicabsorption peaks of perovskite were present in synthesized samples. The EDX analysis exhibited a gooddispersion of elements in optimal photocatalyst and the BET analysis also revealed that the optimalcatalyst had higher specific surface area. Topography and morphology was determined by TEM analysisand the SAED results showed the catalyst structure. The reaction rate equations were also calculated.
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Leila Feyzi,Nader Rahemi,Somaiyeh Allahyari 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.104 No.-
In this work, a combination of synthesized zeolite with a Dielectric Barrier Discharge (DBD) air plasmareactor was applied for the removal of tetracycline (TC) from effluents. The zeolites with differentNa2O/SiO2 ratios were synthesized and inserted in a DBD reactor. The as-prepared zeolites were characterizedby FTIR, SEM, BET, EDX, XRD, and TEM. The XRD results showed that the P-type zeolite turned toY-type zeolite with an increasing Na2/SiO2 ratio from 0.5 to 1.5 and 2.5. The TC degradation experimentsindicated that 79.1% of the initial TC was removed from the solution by the hybrid plasma- zeolite (Na2O/SiO2 ratio of 0.5) system after 45 min. The plasma in synergy with zeolite caused the changing amount oflong-life oxidants in the system and converted it to higher reactive species. The combined system couldreduce around 17 and 10% of the total organic carbon (TOC) and chemical oxygen demand (COD) morethan the sole DBD system, respectively. Losing just 8% of the initial efficiency of the hybrid system afterfour successive runs revealed the stability of the proposed system. The radical trapping experimentmethod indicated that the role of OH in the TC degradation was more critical than that of O2.
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Nader Rahemi,Mohammad Haghighi,Ali Akbar Babaluo,Mahdi Fallah Jafari,Somaiyeh Allahyari 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.9
Argon glow discharge plasma was applied for treatment of impregnated Ni-Cu/Al2O3-ZrO2 nanocatalyst. The catalytic performance toward CO2 reforming of methane and the physicochemical properties were investigated bymeans of GC, BET, XRD, FESEM, TEM, EDX, TG-DTG, XPS and FTIR techniques. The plasma-treated nanocatalystcontains smaller crystal size and high dispersion of NiO. Plasma treatment decreased particle size and plasma highenergy species flattened particles on support, increasing the interaction between support and active metals which leadsto high catalytic activity. Low temperature activity and H2/CO ratio closer to 1 was observed for plasma-treated nano-catalyst compared to non-treated sample. Moreover, higher product yield and H2/CO ratio was found in CH4/CO2=1rather than CH4/CO2=1.5. Time on stream test during 1,440 min at 850 oC showed plasma-treated Ni-Cu/Al2O3-ZrO2nanocatalyst did not experience any deactivation in terms of CH4 and CO2 conversion and H2/CO ratio.
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