Template free facile synthesis of mesoporous mordenite for bulky molecular catalytic reactions

Bhupendra Kumar Singh,김용선,백승빈,Abhishek Meena,Siraj Sultan,곽자훈,김광수 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-

The synthesis of highly stable mesoporous zeolites is one of the great challenges in materials science. Soft and hard templating methods have widely been applied to synthesize mesoporous zeolites having different pore diameters and structures. Here, we report a facile and template free hydrothermal synthesis of mesoporous mordenite (MOR) by controlling synthesis conditions. The small nanoparticles of ∼50–80 nm were self-assembled into 2–3 μm MOR. Intracrystalline mesopores of ∼3–5 nm were abundantly observed throughout the MOR nanoparticles. Synthesized mesoporous MOR demonstrated significantly improved catalytic efficiencies (∼100%), 3–5 times higher than its conventional counterparts (CBV 10A and CBV 21).

Template free facile synthesis of mesoporous mordenite for bulky molecular catalytic reactions

Singh, Bhupendra Kumar,Kim, Yongseon,Baek, Seung Bin,Meena, Abhishek,Sultan, Siraj,Kwak, Ja Hun,Kim, Kwang S. THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-

<P><B>Abstract</B></P> <P>The synthesis of highly stable mesoporous zeolites is one of the great challenges in materials science. Soft and hard templating methods have widely been applied to synthesize mesoporous zeolites having different pore diameters and structures. Here, we report a facile and template free hydrothermal synthesis of mesoporous mordenite (MOR) by controlling synthesis conditions. The small nanoparticles of ∼50–80nm were self-assembled into 2–3μm MOR. Intracrystalline mesopores of ∼3–5nm were abundantly observed throughout the MOR nanoparticles. Synthesized mesoporous MOR demonstrated significantly improved catalytic efficiencies (∼100%), 3–5 times higher than its conventional counterparts (CBV 10A and CBV 21).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Template free facile synthesis of mesoporous mordenite (syn MOR). </LI> <LI> The small nanoparticles of ∼50–80nm were self-assembled into a 2–3μm MOR. </LI> <LI> Intracrystalline mesoporous structure obtained without any acid/base treatment. </LI> <LI> ∼3–5nm mesopores were abundantly observed throughout the MOR nanoparticles. </LI> <LI> Syn MOR demonstrated 3–5 times higher efficiencies than conventional counterparts. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>A facile and template free hydrothermal synthesis of mesoporous mordenite (MOR) which demonstrated significantly enhanced catalytic efficiencies and selectivity due to large pore size (3–5nm).</P> <P>[DISPLAY OMISSION]</P>

Stage specific feeding attributes and mobilization of nutrients in Mexican beetle, Zygogramma bicolorata Pallister on Parthenium hysterophorus L.

Patel Priya,Singh Shailesh,Patel Arvind Kumar,Kumar Bhupendra,Singh Arvind Kumar,Kumar Dinesh 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.2

Parthenium hysterophorus L. (Asteraceae) is a toxic weed of agricultural farms, pastures and wastelands with a pan-tropical distribution. The weed causes a reduction in crop production of agricultural fields and severe health problems in humans. The Mexican beetle, Zygogramma bicolorata Pallister (Coleoptera: Chrysomelidae) is among the most promising candidates for the weed biocontrol. However, no previous study has evaluated assimilation of nutrients in this beetle. In the present study, feeding attributes and assimilation of nutrients by larvae of Z. bicolorata were assessed on the weed. Results revealed that the first larval instars of Z. bicolorata exhibited lowest consumption rates, and accumulated minimum concentrations of glucose, proteins and triglycerides in their body. They showed compensatory feeding, and displayed highest food utilization efficiencies and developmental rates. In contrast, the fourth larval instars exhibited higher food consumption rates and conversion efficiencies, but displayed lowest developmental rates. Accumulation of food reserves was also recorded maximum for the fourth larval instars. Overall, the findings may aid current mass-rearing efforts for Z. bicolorata in laboratories, but field trials are still needed to strengthen the present findings.

Fast ionic conduction in tetravalent metal pyrophosphate-alkali carbonate composites: New potential electrolytes for intermediate-temperature fuel cells

Singh, Bhupendra,Bhardwaj, Aman,Gautam, Sandeep K.,Kumar, Devendra,Parkash, Om,Kim, In-Ho,Song, Sun-Ju Elsevier 2017 Journal of Power Sources Vol.345 No.-

<P><B>Abstract</B></P> <P>Here we present a report on synthesis and characterization of tetravalent metal pyrophosphate (TMP) and alkali carbonate (A<SUB>2</SUB>CO<SUB>3</SUB>; A = Li and/or Na) composites. The TMP-carbonate composites are prepared by mixing indium-doped tin pyrophosphate or yttrium-doped zirconium pyrophosphate with Li<SUB>2</SUB>CO<SUB>3</SUB> or an eutectic mixture of Li<SUB>2</SUB>CO<SUB>3</SUB>-Na<SUB>2</SUB>CO<SUB>3</SUB> in different wt.% ratios. The phase composition, microstructure and electrical conductivity of the sintered specimen are analyzed. In addition, the effect of different TMP and A<SUB>2</SUB>CO<SUB>3</SUB> phases is investigated. A maximum ionic conductivity of 5.5 × 10<SUP>−2</SUP> S cm<SUP>−1</SUP> at 630 °C is observed in this study with a Sn<SUB>0.9</SUB>In<SUB>0.1</SUB>P<SUB>2</SUB>O<SUB>7</SUB>-Li<SUB>2</SUB>CO<SUB>3</SUB> composite. Based on the literature data, TMP-carbonate composites can be considered to be primarily a proton and oxygen-ion co-ionic conductor and, therefore, have strong potential as electrolytes in fuel cells in 500–700 °C range.</P> <P><B>Highlights</B></P> <P> <UL> <LI> New tetravalent metal pyrophosphate (TMP)-alkali carbonate composites are reported. </LI> <LI> TMP-carbonate composites sintered at 750 °C are dense. </LI> <LI> SIP21-L10 composite showed max. conductivity of 5.5 × 10<SUP>−2</SUP> S cm<SUP>−1</SUP> at 630 °C. </LI> <LI> Conductivity of TMP-carbonate is comparable to ceria-carbonate composites. </LI> </UL> </P>

Performance and emission studies on an agriculture engine on neat Jatropha oil

Bhupendra Singh Chauhan,Naveen Kumar,조행묵 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.2

Diesel engines have proven their utility in the transportation, agriculture, and power sectors in India. They are also potential sources of decentralized energy generation for rural electrification. Concerns on the long-term availability of petroleum diesel and the stringent environmental norms have mandated the search for a renewable alternative to diesel fuel to address these problems. Vegetable oils have been considered good alternatives to diesel in the past couple of years. However, there are many issues related to the use of vegetable oils in diesel engine. Jatropha curcas has been promoted in India as a sustainable substitute to diesel fuel. This study aims to develop a dual fuel engine test rig for evaluating the potential suitability of Jatropha oil as diesel fuel and for determining the performance and emission characteristics of an engine with Jatropha oil. The experimental results suggest that engine performance using Jatropha oil is slightly inferior to that of diesel fuel. The thermal efficiency of the engine was lower, while the brake-specific fuel consumption was higher with Jatropha oil compared with diesel fuel. The levels of nitrogen oxides (NOx) from Jatropha oil during the entire duration of the experiment were lower than those of diesel fuel. The reduction of NOx was found to be an important characteristic of Jatropha oil as NOx emission is the most harmful gaseous emission from engines; as such, its reduction is always the goal of engine researchers and makers. During the entire experiment, carbon monoxide (CO), hydrocarbon (HC), and carbon dioxide (CO2) emissions in the case of using Jatropha oil were higher than when diesel fuel was used. The higher density and viscosity of Jatropha oil causes lower thermal efficiency and higher brakespecific fuel consumption. The performance and emission characteristics found in this study are significant for the study of replacing diesel fuel from fossils with Jatropha oil in rural India, where the availability of diesel has always been a problem.

Evaluation of Aflatoxin B1 Biosynthesis in A. flavus Isolates from Central India and Identification of Atoxigenic Isolates

Tarun Kumar Patel,Rajesh Anand,Agam Prasad Singh,Jata Shankar,Bhupendra N. Tiwary 한국생물공학회 2014 Biotechnology and Bioprocess Engineering Vol.19 No.6

Present study describes the effect of temperatureand pH on biosynthesis of aflatoxin B1 (AFB1) to identifyatoxigenic (aflatoxin non-producer) isolates of Aspergillusflavus. An indigenous detection method for AFB1 wasdeveloped using tandem mass spectrometric method. Detection of AFB1 was carried out in positive polarityusing triple quadrapole mass spectrometer with electrosprayionization interface in Multiple Reaction Monitoring(MRM) mode. A total of four A. flavus isolates wereselected for screening of AFB1 biosynthesis at pH 4.0, 5.5,7.0, and 8.5 at 27°C. Highest AFB1 biosynthesis inMTCC11866 was found at pH 6.5 while in MTCC9367 itwas at pH 7.0. On screening AFB1 biosynthesis in A. flavusculture at various temperatures a significant suppression inAFB1 biosynthesis was found at 37°C in comparison to 24and 27°C in MTCC11866 and MTCC9367. AFB1 was notdetected in other two A. flavus isolates MTCC11580 andMTCC11588 at any temperature and pH tested. AFB1nonproducing isolates, MTCC11580 and MTCC11588could be used as potent biocontrol agent. Additionally,present standardized method for AFB1 detection may findits application in qualitative and quantitative analysis ofAFB1 contamination in food crop and other products.

EMISSION ANALYSIS OF A MEDIUM CAPACITY DIESEL ENGINE USING MAHUA OIL BIODIESEL

Ajay Kumar Sharma,L.M.Das,S.N.Naik,Bhupendra Singh Chauhan,Haeng Muk Cho 한국에너지학회 2013 에너지공학 Vol.22 No.2

A class of chain ratio–product type estimators with two auxiliary variables under double sampling scheme

Sanjib Choudhury,Bhupendra Kumar Singh 한국통계학회 2012 Journal of the Korean Statistical Society Vol.41 No.2

In this paper, a chain ratio–product type estimators has been developed for estimating population mean of the study variable using two auxiliary variables under double sampling scheme, when the information on another additional auxiliary character is available along with the main auxiliary character. The optimum property of the proposed strategy has been identified in two different cases with their variances. Theoretical and empirical studies have been done to demonstrate the efficiency of the proposed estimator over other estimators, which utilized the information on two auxiliary characteristics.

EMISSION ANALYSIS OF A MEDIUM CAPACITY DIESEL ENGINE USING MAHUA OIL BIODIESEL

Sharma, Ajay Kumar,Das, L.M.,Naik, S.N.,Chauhan, Bhupendra Singh,Cho, Haeng Muk The Korean Society for Energy 2013 에너지공학 Vol.22 No.2

The stringent emission norms cannot be met through engine design and exhaust after treatment alone. Use of oxygenated fuel like biodiesel as a alternative to diesel may be the best way to reduce emissions today. In this study, Diesel fuel and pure biodiesel (mahua oil) were tested on a single cylinder naturally-aspirated direct-injection diesel engine. The study aims to investigate the effects of the mahua oil biodiesel on existing diesel engine emissions. The effect of test fuels on engine emissions like CO, HC, $CO_2$, NOx and smoke emissions was investigated with respect to the load on engine. Smoke opacity of Diesel engine was lower in case of biodiesel of mahua oil as compare to mineral diesel. NOx emissions was little higher during the whole range of loading, which is a typical characteristic of biodiesel. However the increments are within in the narrow range. $CO_2$ emissions was bit higher which is the indication of better combustion due to presence of rich oxygen in the mixture, it results in the low values of CO and HC during the whole range of experiments. Thus considering environmental norms most of the engine emissions, it can be concluded and biodiesel derived from mahua oil could be used in a conventional diesel engine without any modification.

An Experimental Study on NOX Reduction in a Diesel Engine with Cold EGR

부펜더(Chauhana, Bhupendra Singh),나빈쿠마르(Kumar, Naveen),전용두(Jun, Yong-Du) 한국산학기술학회 2010 한국산학기술학회 학술대회 Vol.- No.-

The objective of the current research work is to investigate the usage of biodiesel combined with the use of EGR in order to reduce the emission of all regulated pollutants from diesel engines. A single cylinder, air cooled, constant speed direct injection diesel engine was used for the experimental work and a cold EGR system was developed and fitted to the engine. Concentrations of HCs, NOx, and CO from the exhaust gas along with the smoke opacity were measured. Engine performance parameters such as the brake thermal efficiency (BTE) and the brake specific energy consumption (BSEC) were also calculated from the measured data. The results from the present investigation suggest that 25-30% EGR rate could give excellent NOx reduction without any significance penalty on smoke opacity or BSEC under the engine load of up to 40%. Under the full load condition, 15% EGR rate was found to be an option while higher EGR rate resulted in inferior performance and heavy smoke.