固体触媒上炭素質のDTA迅速定量法の反応操作への応用
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The rapid determination of cokes on solid catalysts was successfully applied to the cokes with different deposite circumstances and properties from those in the previous report.<BR>Results of analysis on a toluene disproportionation reaction using a fixed-bed flow reactor with silica-alumina catalysts were as follows.<BR>(1) The deposite cokes seem to be a little concentrated on the bed inlet.<BR>(2) The rate of reaction of the coke formation is apparently 0th order (<I>i. e</I>. independent on) with respect to the concentration of active sites in the reaction provided that they were poisoned the deposite. The activation energy of the coke formation is determined as 37.6 kcal/mole.<BR>(3) From the comparison of the toluene disproportionation activity and the activity of coke formation on fresh silica-alumina catalyst, on that inactivated by the cokes, and on an utterly poisoned catalyst of which the acid sites are exchanged by Na<SUP>+</SUP>, the deposited coke was supposed to cover loosely and poison only incompletely the surface active sites.<BR>(4) The proportionality between the amount of deposited coke and the amount ∫<SUP>m</SUP><SUB>0</SUB>(<I>b</I>-<I>x</I>)<I>dm</I> (where <I>b</I> and <I>x</I> represent the conversion of toluene to benzene and xylene, respectively, and <I>m</I> represents the cumulative feeds of toluene in moles) given in the previous report was not followed in this case.<BR>(5) The correlation between the amount of the coke and the degradation of catalytic activity by the coke deposition depended on the sort of catalysts and the reacting conditions.
- 社団法人 日本分析化学会の論文
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