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Thushara Kandaramath Hari Zahira Yaakob 《International Journal of Green Energy》2017,14(14):1163-1171
Influence of catalyst calcination temperature on the catalyst characteristics and catalytic transesterification of Jatropha curcas oil for biodiesel production was studied by using sodium zirconate (Na2ZrO3) solid base catalyst. Na2ZrO3 catalysts were prepared by impregnation method followed by calcination at temperatures of 700, 800, and 900°C. The prepared catalysts were characterized by X-ray diffraction analysis, Fourier transform infrared spectroscopy, and field emission scanning electron microscopy. Important parameters influencing the catalytic activity and fatty acid methyl ester yield were investigated. It was found that the increase in calcination temperature showed marked increase in activity due to the increased porosity and presence of tetragonal zirconia. Investigation of the reusability of the catalysts showed that the catalytic activity was retained even after five cycles of reaction. 相似文献
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Khan Muhammad Tariq Iqbal Anwar Sofia Batool Zahira 《Environmental science and pollution research international》2022,29(35):52412-52437
Environmental Science and Pollution Research - This study shows the impact of risk (hazard, exposure, and vulnerability) and resilience (infrastructure, information and communication technology,... 相似文献
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M. N. Satheesh Kumar Zahira Yaakob Siti Maimunah Siddaramaiah S. R. S. Abdullah 《Journal of Polymers and the Environment》2010,18(4):539-544
The kinetics of polyesterification of glycerol, phthalic anhydride and jatropha oil leading to the formation of alkyd resins
were studied. A series of alkyd resins having different amount of jatropha oil viz., 40–80% have been prepared by employing
two stage alcoholysis-polyesterification process. The extent of reaction and average degree of polymerisation were calculated
from the end group analysis of the reaction mixture withdrawn at regular intervals of time. The initial reaction rates followed
the second order kinetics and thereafter deviations were observed. An appreciable degree of conversion was noticed from the
extent of the reaction which lies in the range of 49.5–62.5%. The average degree of polymerisation calculated in the region
of deviation from second order suggested the occurrence of chain branching at relatively shorter intervals along the polymer
chain. The second order rate constants were found to be of the order of 10−5 g (mg KOH)−1 min−1. 相似文献
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