Effect of T(III) zoning in MFI-type zeolites on the adsorption isotherm and differential enthalpies of adsorption at 77 K
Effect of T(III) zoning in MFI-type zeolites on the adsorption isotherm and differential enthalpies of adsorption at 77 K
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MFI型沸石中T(III)区带对77 K吸附等温线和吸附微焓的影响
DOI：
10.1021/la00014a038
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发表时间：
1994
期刊：
影响因子：
3.9
通讯作者：
J. Rouquerol
中科院分区：
文献类型：
--
作者：
P. Llewellyn;Y. Grillet;J. Rouquerol
采用等温气体吸附微量热法（Ar， N2和CO）和77 K准平衡吸附体积法，对具有三价金属（铝或铁，标记为T (III)）均匀或非均匀分布的mfi型样品进行表征。研究发现，特别是在这些样品上显示的“类流体”到“类固体”的相变过程中，一氧化碳可以区分那些具有明显的T （III）区带的样品（无论是在晶体的内部还是外部）。然而，氩不受T （III）含量（无论分布如何）的很大影响，并提供了这些样品的补充结构检查。
The characterization of MFI-type samples with crystals exhibiting either a homogeneous or heterogeneous distribution of the trivalent metal (aluminum or iron, labeled T (III)) is carried out using isothermal gas adsorption microcalorimetry (Ar, N2, and CO) coupled with quasi-equilibrium adsorption volumetry at 77 K. It is found that, especially during the “fluid-like” to “solid-like” phase transition exhibited on these samples, carbon monoxide can distinguish those with a distinct T (III) zoning (whether it is toward the interior or exterior of the crystals). Argon however, is not greatly affected by the T (III) content (whatever the distribution) and provides a complementary textural examination of these samples.