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51.
C. Anand P. Srinivasu S. Alam V.V. Balasubramanian D.P. Sawant M. Palanichamy V. Murugesan A. Vinu 《Microporous and mesoporous materials》2008,111(1-3):72-79
Three-dimensional cage type ferrosilicate catalysts with different nSi/nFe ratios (FeSBA-1(x) where x denotes the nSi/nFe molar ratio) have been prepared at a molar hydrochloric acid to silicon ratio of 10 using cetyltriethylammonium bromide as the template. The obtained materials have been unambiguously characterized by XRD, N2 adsorption, and ESR spectroscopy, and their catalytic activity in the benzylation of benzene and the substituted benzene has also been investigated. The catalytic results of the FeSBA-1 catalysts with different nSi/nFe ratios have been compared with the uni-dimensional FeSBA-15, AlSBA-15 and FeHMS catalysts. It has been found that the activity of the FeSBA-1 catalysts is much higher as compared to that of the FeSBA-15, FeHMS and AlSBA-15 catalysts. The activity of the catalysts declines in the following order: FeSBA-1(36) > FeSBA-1(90) > FeSBA-1(120) > FeSBA-1(344) > FeSBA-15(152) > FeHMS(50) > AlSBA-15(45). The effect of various reaction parameters such as reaction time, reaction temperature, reactant feed ratio and the various electron donating groups on the benzene ring affecting the activity and selectivity of FeSBA-1(344) have also been studied. The catalysts are highly active and show a complete conversion of benzyl chloride and a clean selectivity to diphenylmethane (DPM) within a short period of time under the optimized reaction conditions. The reaction kinetics of the catalysts has been extensively investigated and the results are presented. The apparent rate constant of the FeSBA-1(344) and the BC conversion sharply increase with increasing the reaction temperature. The activity of the FeSBA-1(344) catalyst for the benzylation of different aromatic compounds is in the following order: benzene > anisole > mesitylene > p-xylene > toluene. 相似文献
52.
C. V. Subramanian M. Thavasimuthu P. Palanichamy D. K. Bhattacharya Baldev Raj 《NDT & E International》1991,24(1)
The ultrasonic dry-couplant technique has been used to evaluate adhesive bonds in honeycomb and aluminium-fibre reinforced plastic-aluminium sandwich materials. The technique does not require conventional liquid couplant. Both pitch-catch and through transmission methods were adopted. Disbonds have been successfully detected and evaluated using the technique. 相似文献
53.
Enhancement of photocatalytic activity by metal deposition: characterisation and photonic efficiency of Pt, Au and Pd deposited on TiO2 catalyst 总被引:9,自引:0,他引:9
Sakthivel S Shankar MV Palanichamy M Arabindoo B Bahnemann DW Murugesan V 《Water research》2004,38(13):3001-3008
Pt, Au and Pd deposited TiO2 have been prepared and characterised by surface analytical methods such as surface area, XRD, and scanning electron micrograph and photophysical characterisation by diffuse reflectance spectroscopy. The photocatalytic activity of the doped catalysts was ascertained by the photo-oxidation of leather dye, acid green 16 in aqueous solution illuminated with low-pressure mercury lamp ( approximately 254 nm). The effect of metal contents on the photocatalytic activity was investigated. The highest photonic efficiency was observed with metal deposition level of less than 1 wt%. 相似文献
54.
Wireless Networks - Dissemination is a service provided for Wireless Sensor Networks to update the deployed sensor nodes online by using over air programming through radio communication. Since the... 相似文献
55.
Due to the environmental concerns that evolve from the emissions produced by fossil-fuelled power plants, the economic dispatch that minimises only the total fuel cost can no longer be considered single-handed. This paper proposes an analytical strategy based on mathematical modelling to solve economic, emission, and combined economic and emission dispatch problems by a single equivalent objective function. The proposed strategy has been applied to dissimilar realistic systems at different load conditions and the outcome of one such realistic system is presented here. 相似文献
56.
Cobalt boride (Co2B) is an inexpensive catalyst for the hydrolysis of sodium borohydride (NaBH4) to generate hydrogen (H2) for PEM fuel cells. Preparation of Co2B in situ in the H2 generation vessel as well as in an external reactor was studied using cobalt (III) oxide (Co3O4) and lithium cobalt oxide (LiCoO2) as precursors. The oxide precursors were characterized by XRD and the Co2B catalysts by XRD and ICP. Co2B formation from the oxide precursors depends on the crystallinity of the oxides as well as the concentration of NaBH4 in the solution. During reduction of the oxides to CoB2, Co(s) metal, Co(BO2)2 may also form from competing side reactions, however crystalline oxides react faster leading to higher Co2B yield and better H2 generation efficiency. Crystallinity of Co3O4 was improved by preparing it at a higher temperature. Co3O4 prepared at 600 °C reacts faster leading to enhanced Co2B formation than Co3O4 prepared at lower temperatures (200 °C and 400 °C). The activation energy for the hydrolysis of NaBH4 by Co2B formed in situ from Co3O4 produced at 600 °C was calculated to be 77.90 kJ mol−1. This activation energy value is found to be slightly higher than that of Pt, Ru-based catalysts. 相似文献
57.
Real-time decay of fluorinated fullerene molecules on Cu(001) surface controlled by initial coverage
Oreshkin Andrey I. Muzychenko Dmitry A. Oreshkin Sergey I. Yakovlev Vladimir A. Murugan Palanichamy Chandrasekaran S. Selva Kumar Vijay Bakhtizin Rauf Z. 《Nano Research》2018,11(4):2069-2082
Nano Research - In this study, the evolution of C60F18 molecules on a Cu(001) surface was studied by means of scanning tunneling microscopy and density functional theory calculations. The results... 相似文献
58.
Wireless Networks - In-network data aggregation is an inherent paradigm that extends the lifetime of resource-constrained wireless sensor networks (WSNs). By aggregating sensor data at... 相似文献
59.
Equilibrium and kinetic studies on the removal of Acid Red 114 from aqueous solutions using activated carbons prepared from seed shells 总被引:1,自引:0,他引:1
Thinakaran N Panneerselvam P Baskaralingam P Elango D Sivanesan S 《Journal of hazardous materials》2008,158(1):142-150
The use of low-cost and ecofriendly adsorbents has been investigated as an ideal alternative to the current expensive methods of removing dyes from wastewater. This paper deals with the removal of Acid Red 114 (AR 114) from aqueous solutions using activated carbons prepared from agricultural waste materials such as gingelly (sesame) (Sp), cotton (Cp) and pongam (Pp) seed shells. Optimum conditions for AR 114 removal were found to be pH 3, adsorbent dosage=3g/L of solution and equilibrium time=4h. Higher removal percentages were observed at lower concentrations of AR 114. The adsorption isotherm data were fitted to Langmuir and Freundlich equation, and the adsorption capacity of the studied adsorbents was in the order Sp>Cp>Pp. Kinetic studies showed that the adsorption followed both pseudo-second-order and Elovich equation. The thermodynamics parameters such as DeltaG degrees, DeltaH degrees, DeltaS degrees were also evaluated. The activated carbons prepared were characterized by FT-IR, SEM and BET analysis. 相似文献
60.
Palanichamy Krishnan Suresh G. AdvaniAjay K. Prasad 《Journal of power sources》2011,196(18):7755-7759
Polythiocyanogen, (SCN)x, is a promising lithium-ion battery electrode material due to its high theoretical capacity (462 mAh g−1), safe operation, inexpensive raw materials, and a simple and less energy-intensive manufacturing process. The (SCN)x was prepared from the solution of trithiocyanate (SCN)3− in methylene dichloride (MDC), which was prepared by electrochemical oxidation of ammonium thiocyanate (NH4SCN) in a two-phase electrolysis medium of 1.0 M NH4SCN in 0.50 M H2SO4 + MDC. The (SCN)3− underwent auto catalytic polymerization to (SCN)x during MDC removal. Battery electrodes with (SCN)x as the active material were prepared, and tested in Swagelok cells using lithium foil as the counter and reference electrode. The cells delivered capacities in the range of 200-275 mAh g−1 at the discharge-charge rate of 0.2 C. The cells were tested up to 20 cycles and showed repeatable performance with a coulombic efficiency of 97% at the 20th cycle. The results presented here indicate that (SCN)x is a promising lithium-ion battery electrode-material candidate for further studies. 相似文献