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Rana, Masud,Islam, Mohammad Nazrul,Agarwal, Ashutosh,Taki, Golam,Park, Seong-Jae,Dong, Shin,Jo, Young-Tae,Park, Jeong-Hun American Chemical Society 2018 Energy & fuels Vol.32 No.11
<P>MoO<SUB>3</SUB> catalyst supported on synthesized mesoporous SBA-15 matrix was employed in the hydrothermolysis of Kraft lignin in a basic-subcritical water system. Experiments were carried out in a batch reactor at 350 °C for 1 h under N<SUB>2</SUB> atmosphere using two different solvent systems of sub-H<SUB>2</SUB>O and 0.5% NaOH. At 10% (w/w) of synthesized MoO<SUB>3</SUB>/SBA-15 catalyst with lignin, the highest total crude bio-oil yield (∼56.40 wt %) and lowest char formation (∼8.60 wt %) were observed in basic medium, in comparison to the subcritical water system. The GC-MS analysis of the produced bio-oil indicated that the major products in the crude bio-oil were phenol-rich monomers such as guaiacols (19.50%), alkyl-guaiacols (24.83%), catechol (26.76%), and alkyl-catechols (17.82%) under subcritical water condition. Alternatively, catechols (42.07%) and alkyl-catechols (34.59%) were the primary products in the basic solvent system with the presence of MoO<SUB>3</SUB>/SBA-15 catalyst. Additionally, monophenols (5.0%) were also produced as a result of the demethoxylation of guaiacol or hydrodeoxygenation of catechol. MoO<SUB>3</SUB>/SBA-15 catalyst significantly reduced the oxygen-carbon ratio (O/C) from 0.72 (in original Kraft lignin) to 0.29 (in basic-subcritical water system). Decreased oxygen and increased carbon and hydrogen contents enhanced the calorific value of the produced bio-oil, whereby a higher heating value (HHV) of 32.00 MJ/kg was achieved. The synthesized catalysts were characterized through BET, XPS, ICP-OES, and HR-TEM analyses.</P> [FIG OMISSION]</BR>
Rana, Md. Masud,Baten, Md. Azizul,Rabman, Mezbahur Korean Data and Information Science Society 2008 한국데이터정보과학회지 Vol.19 No.4
This paper considers three different models with two functional forms, Cobb-Douglas and Translog, for the stochastic frontier production function of food manufacturing industry of Bangladesh over the period 1981-1982 to 1999-2000. The models are proposed by Battese and Coelli (1992, 1995) and Huang and Liu (1994). The technical efficiency, total factor productivity, technological change and technical efficiency change have been estimated in the frontier models. The results indicate that 41.47%, 59.30% and 70.98% of the potential output are being realized in this sector. The mean increments in total factor productivity are approximately 2%, 9% and 4% respectively.
Trend Characteristics of Atmospheric Particulate Matters in Major Urban Areas of Bangladesh
Md Masud Rana,Munjurul Hannan Khan 한국대기환경학회 2020 Asian Journal of Atmospheric Environment (AJAE) Vol.14 No.1
The urban areas of Bangladesh suffer from severe air quality problem especially in dry season (November-April) when the PM concentrations frequently rise to 7-8 times of the WHO guideline value. The Clean Air and Sustainable Environment (CASE) Project of the Department of Environment has deployed countrywide continuous air monitoring systems to regularly monitor the air quality of the urban areas of Bangladesh. In this paper hourly concentrations of PM10 and PM2.5 captured using β-attenuation method from 2013 to April 2018 in six important cities located in different regions of the country were exhaustively analyzed. Statistical analyses, diurnal and seasonal trends, and polar plots of PM concentrations were examined. Long range sources were spotted by Concentration Weighted Trajectory (CWT) method, where the trajectories were calculated using HYSPLIT-4 model. The analyses identified cities in the middle of the country (Dhaka, Narayanganj, Gazipur) as the most polluted ones while the city to the northeast region (Sylhet) was the least polluted. Average PM10 concentrations at Dhaka, Chattogram, Narayanganj, Gazipur, Sylhet and Barisal stations in dry seasons (November-April) were found 238.7±155.4, 190.7±108.5, 303.6±161.4, 227.3±142.7, 151.7±105.0 and 170.7±108.4 μg m-3 respectively whereas those in wet seasons (May-October) were 75.0±51.6, 55.5±40.8, 102.4±84.4, 60.6±48.5, 52.7±38.3, and 54.4±41.6 μg m-3 respectively. Correlative study of diurnal variations in PM concentrations and meteorological parameters revealed that the congenial meteorology aided in developing higher concentrations of both PM10 and PM2.5 during nighttime. Sources located to the northwestern districts (Naogao, Rangpur, Bogura) were traced by the CWT method contributing to the air pollution in other regions of the country. Outside the boundary, sources in Nepal, and Delhi-NCR and Uttar Pradesh regions of India could have contributed to fine particles at the middle of the country.
Md. Masud Rana,박경세,선호정,임형렬,이홍기,심중표 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.12
Several electrode parameters and operating conditions were investigated on the cell performance of anionexchange membrane-unitized regenerative fuel cell (AEM-URFC). The AEM-URFC’s performance increased withincreasing the ionomer and catalyst contents on the electrode up to an optimum amount and then decreased due tothe blockage of mesopores on the catalyst layers. The AEM-URFC with optimal ionomer and catalyst loaded showedthe maximum current (255.0mA/cm2) and power (127.5mW/cm2) density at 0.50 V for fuel cell mode at 60 oC. Also,three different kinds of commercial AEMs were tested in URFC. The catalyst for the bifunctional oxygen electrode hada pronounced influence on the cell performance of AEM-URFC. Ir black showed the highest WE performance thanother precious catalysts (Pt/C, PtRu black, and IrO2), but lower performance in FC mode than Pt/C and PtRu catalysts. The optimized AEM-URFC had 48.30% round trip efficiency, which is comparable or superior to the resultsreported in the literature.