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충전층 플라즈마 반응기에서 Ni-CeO₂ / γ-Al₂O₃ 촉매를 이용한 프로페인-합성 가스 건식 개질
라미아 술타나(Lamia Sultana),Md. 샤히누르 라만(Md. Shahinur Rahman),M.S.P. 수드하카란(M.S.P. Sudhakaran),Md. 목터 호세인(Md. Mokter Hossain),목영선(Young Sun Mok) 한국청정기술학회 2019 청정기술 Vol.25 No.1
프로페인(C₃H8)의 건식 개질(CO₂ 개질)을 통한 합성 가스(H₂와 CO 혼합물) 제조를 위해 Ni-CeO₂/γ-Al₂O₃ 촉매가 충진된 유전체 장벽 방전 플라즈마 반응기를 사용하였다. 열 또는 플라즈마에 의해 환원된 Ni-CeO₂/γ-Al₂O₃ 촉매를 사용하여 C₃H8/CO₂ 비율 1/3, 총 유량 300 mL min<SUP>-1</SUP>에서 플라즈마-촉매 건식 개질을 수행하였다. 건식 개질에 대한 촉매 활성은 온도범위 500 ~ 600 ℃에서 평가되었다. Ni-CeO₂/γ-Al₂O₃ 촉매 제조를 위해 전구물질 수용액(질산니켈, 질산세륨)으로 함침된 γ-Al₂O₃를 공기 분위기에서 소성시킨 후, H₂/Ar 분위기에서 환원시켰다. 촉매 특성 조사에는 X-선 회절분석기(XRD), 투과 전자현미경(TEM), 전계 방출 주사전자현미경(FE-SEM), 승온 탈착(H₂-TPD, CO₂-TPD) 및 라만 분광기가 이용되었다. 열로 환원된 촉매와 비교하면 플라즈마 방전하에서 환원된 Ni-CeO₂/γ-Al₂O₃ 촉매가 개질 반응을 통한 합성 가스 생산에서 보다 우수한 촉매 활성을 나타내었다. 또한, 플라즈마로 환원된 Ni-CeO₂/γ-Al₂O₃가 개질 반응의 문제점인 탄소퇴적 관점에서 장기 촉매 안정성을 보여주었다. A dielectric barrier discharge (DBD) plasma reactor packed with Ni-CeO₂/γ-Al₂O₃ catalyst was used for the dry (CO₂) reforming of propane (DRP) to improve the production of syngas (a mixture of H₂ and CO) and the catalyst stability. The plasma-catalytic DRP was carried out with either thermally or plasma-reduced Ni-CeO₂/γ-Al₂O₃ catalyst at a C₃H8/CO₂ ratio of 1/3 and a total feed gas flow rate of 300 mL min<SUP>-1</SUP>. The catalytic activities associated with the DRP were evaluated in the range of 500 ~ 600 ℃. Following the calcination in ambient air, the γ-Al₂O₃ impregnated with the precursor solution (Ni(NO₃)₂ and Ce(NO₃)₂) was subjected to reduction in an H2/Ar atmosphere to prepare Ni-CeO₂/γ-Al₂O₃ catalyst. The characteristics of the catalysts were examined using X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectrometry (EDS), temperature programmed reduction (H₂-TPR), temperature programmed desorption (H₂-TPD, CO₂-TPD), temperature programmed oxidation (TPO), and Raman spectroscopy. The investigation revealed that the plasma-reduced Ni-CeO₂/γ-Al₂O₃ catalyst exhibited superior catalytic activity for the production of syngas, compared to the thermally reduced catalyst. Besides, the plasma-reduced Ni-CeO₂/γ-Al₂O₃ catalyst was found to show long-term catalytic stability with respect to coke resistance that is main concern regarding the DRP process.
Performance of Cement Mortars under Tannery Wastewater
Tanvir Manzur,Sinha Lamia Sultana,Samira Mahmud,Sifat Azad Papry,Swakshar Saha,Mahbuboor Rahman Choudhury 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.11
This research studied the performance of Ordinary Portland Cement (OPC) and Portland Composite Cement (PCC) composites when exposed to tannery wastewater (TWW), which is generated in large quantities in different tannery industries in Bangladesh. With increasing prospects for tanning industries in the country, selection of suitable construction material will enable sustainable development in this sector. TWW consists of several chemicals that have detrimental effects on concrete. Performances of OPC and PCC were measured in terms of strength, expansion, and weight loss. Microstructures of the test specimens were also studied through Scanning Electron Microscopy (SEM), X-ray Powder Diffraction (XRD), and Energy-dispersive Spectroscopy (EDS) analysis. Results revealed that PCC test specimens performed better compared to those of OPC in terms of strength and degradation when exposed to TWW. The inferences made from this study will be helpful for selection of suitable cement type in future structures exposed to similar severe conditions.
M.S.P, Sudhakaran,Sultana, Lamia,Hossain, Md. Mokter,Pawlat, Joanna,Diatczyk, Jaroslaw,Brü,ser, Volker,Reuter, Stephan,Mok, Young Sun THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2018 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.61 No.-
<P><B>Abstract</B></P> <P>Dry reforming of propane (DRP) with CO<SUB>2</SUB> was examined over iron–ceria spinel (FeCe<SUB>2</SUB>O<SUB>4</SUB>) that was synthesized on mesoporous alumina foam by the sol–gel method. The FeCe<SUB>2</SUB>O<SUB>4</SUB>/Al-F catalyst exhibited significant catalytic activity for the DRP with propane and CO<SUB>2</SUB> conversions of 93% and 76%, respectively. Moreover, the redox behavior of the spinel was found to greatly reduce the deposition of carbon, which could be attributed to the oxidation of surface carbon to CO via the interaction with FeCe<SUB>2</SUB>O<SUB>4</SUB> lattice oxygen. The FeCe<SUB>2</SUB>O<SUB>4</SUB>/Al-F catalyst with good catalytic activity, long-term stability and coke resistance may be a promising candidate for the DRP.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Spinel FeCe<SUB>2</SUB>O<SUB>4</SUB> catalyst on alumina foam studied for the propane dry reforming reaction. </LI> <LI> FeCe<SUB>2</SUB>O<SUB>4</SUB> catalyst to improve the productivity and enhance the resistance to deactivation of catalyst. </LI> <LI> Propane conversion higher than 90% is achieved with negligible carbon. </LI> <LI> Significant improvement of catalytic activity, high stability and inhibition of coke formation by FeCe<SUB>2</SUB>O<SUB>4</SUB> catalyst compared to NiO–CeO<SUB>2</SUB>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Iron–ceria spinel (FeCe2O4) catalyst for dry reforming of propane to inhibit carbon formation
Sudhakaran M.S.P,Lamia Sultana,Md. Mokter Hossain,Joanna Pawlat,Jaroslaw Diatczyk,Volker Brüser,Stephan Reuter,목영선 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.61 No.-
Dry reforming of propane (DRP) with CO2 was examined over iron–ceria spinel (FeCe2O4) that was synthesized on mesoporous alumina foam by the sol–gel method. The FeCe2O4/Al-F catalyst exhibited significant catalytic activity for the DRP with propane and CO2 conversions of 93% and 76%, respectively. Moreover, the redox behavior of the spinel was found to greatly reduce the deposition of carbon, which could be attributed to the oxidation of surface carbon to CO via the interaction with FeCe2O4 lattice oxygen. The FeCe2O4/Al-F catalyst with good catalytic activity, long-term stability and coke resistance may be a promising candidate for the DRP.