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RISS 인기검색어
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- 저자 : Eswaramoorthy, K. (검색결과 2 건)
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Muthukumar, P.,Padmasuresh, L.,Eswaramoorthy, K.,Jeevananthan, S. The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.2
The inverted sine carrier-based pulse width modulation scheme has been acknowledged for fundamental fortification in DC-AC conversion. This paper suggests a randomized inverted sine carrier for the half-controlled PWM switching strategy of a three-phase voltage source inverter to enhance its ability to spread harmonic power. A detailed study of the proposed modulation technique is presented through MATLAB-Simulink, and switching pulses are generated in the ModelSim digital environment. Harmonic analyses and assessments of different performance measures such as power spectrum density, harmonic spread factor, total harmonic distortion and dominating harmonic orders for various modulation indices have been carried out. Simulation and experimental results show that the proposed PWM method can spread harmonic power in output voltage better than the conventional SPWM or SVPWM. For real-time digital implementation, the gating signals are generated using a field-programmable gate array Spartan XC3S500E-320F device.
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Nickel Impregnated Pt/H-β and Pt/H-Mordenite Catalysts for Hydroisomerization of n-Hexane
Eswaramoorthi, Iyyamperunal,Lingappan, Nachiyappan 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.2
Nickel impregnated Pt/H-β and Pt/H-MOR catalysts with different Ni content sere prepared and subjected to hydroisomerization of n-hexane in the presence of flowing H_2 gas. The states of Pt and Ni were identified by ESCA. The particle size measured by TEM shows that average particle size increases with Ni loading. The acidity of the catalysts was measured by TPD of ammonia. The catalytic activity of Ni containing and Ni free Pt/H-β and Pt/H-MOR catalysts was compared and found that addition of Ni up to a threshold value(0.3 wt% for β and 0.1 wt% for MOR) increases the n-hexane conversion and dimethyl butanes selectivity due to better metal-acid synergism and decreases the amount of cracked products. When the Ni amount exceeds the threshold values the conversion decreases and cracked products increase. Further the Ni impregnation of Pt containing acidic supports increases the sustainability of the catalysts and was found to favor the protonated cyclopropane(PCP) intermediate mechanism in n-hexane isomerization. β zeolite was found to be a better potential support than mordenite and the isomerized product mixture shows better octane number.
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