Effect of pH and temperature on the catalytic properties of manganese dioxide
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نویسنده
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akhtar k. ,khalid n. ,ali m.
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منبع
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journal of the chemical society of pakistan - 2012 - دوره : 34 - شماره : 2 - صفحه:263 -268
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چکیده
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Manganese dioxide was studied for its catalytic activity under different experimental conditions such as ph (3 -10) and temperature (30 -70°c). decomposition of hydrogen peroxide is used as an indicator reaction for the catalyst. the kinetics of the reaction was analyzed by first order equation and rate constants were determined from the slopes of the straight lines. it was observed from the experimental results that the decomposition rate constant was found to be dependent on ph and temperature. the high rate constants at high ph values for the decomposition reaction demonstrated the fact that negative surface sites are responsible for the decomposition of hydrogen peroxide. the same trend in the percent decomposition of hydrogen peroxide was observed while using nano 3 as a background electrolyte. it was further noted that high temperature enhanced the catalytic activity of mno 2. activation energy for the decomposition reaction at different ph was estimated from the slope of arrhenius plot.
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کلیدواژه
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Catalytic decomposition; Hydrogen peroxide; Manganese dioxide
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آدرس
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national centre of excellence in physical chemistry,university of peshawar, Pakistan, kohat university of science and technology, Pakistan, kohat university of science and technology, Pakistan
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