The nature of active sites on zeolites: XIII. The acidity and catalytic activity of magnesium ammonium Y zeolite
The nature of active sites on zeolites: XIII. The acidity and catalytic activity of magnesium ammonium Y zeolite
复制标题
沸石上活性位点的性质：XIII。
DOI：
10.1016/0021-9517(72)90106-6
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发表时间：
1972
影响因子：
7.3
通讯作者：
J. W. Ward
中科院分区：
文献类型：
--
作者：
J. W. Ward
测定了Y铵镁沸石上正二甲苯异构化的催化活性与煅烧温度的关系。在570-580°C煅烧后观察到最大活性。这个温度落在勃朗斯特酸度最大值的煅烧温度范围内。它也低于发生显著去羟基化的温度。催化结果可以简单地用Bronsted酸位点浓度来解释，似乎不需要调用Lewis酸位点或缺陷位点。结果和结论与用Y铵沸石所得到的结果有明显的对比。这种差异可能是由于没有涉及Y型铵沸石的热不稳定性的并发症。
Catalytic activity measurements ofortho-xylene isomerization over magnesium ammonium Y zeolite have been made as a function of calcination temperature. A maximum activity is observed after calcination at 570–580 °C. This temperature falls within the calcination temperature range for maximum Bronsted acidity. It is also below the temperature at which marked dehydroxylation occurs.The catalytic results can be explained simply in terms of Bronsted acid site concentrations and there appears to be no need to invoke Lewis acid sites or defect sites. The results and conclusions are in marked contrast to those found with ammonium Y zeolite. The difference may be due to the absence of complications involving the thermal instability of the ammonium Y zeolite.