CATALYTIC ALUMINAS .1. SURFACE CHEMISTRY OF ETA AND GAMMA-ALUMINA
CATALYTIC ALUMINAS .1. SURFACE CHEMISTRY OF ETA AND GAMMA-ALUMINA
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DOI：
10.1016/0021-9517(63)90004-6
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发表时间：
1963-01-01
影响因子：
7.3
通讯作者：
BARTH, RT
中科院分区：
文献类型：
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作者：
MACIVER, DS;TOBIN, HH;BARTH, RT
通过气体吸附量热法和浸渍量热法研究和比较了表征良好的η和γ氧化铝样品的表面性质。从所获得的结果，可以得出结论，氧化铝样品的表面化学可能取决于一个显着的程度上的结构或“类型”的氧化铝被认为是。γ氧化铝不同于η氧化铝，不仅在于其孔径分布，而且在于γ氧化铝的水含量比η氧化铝大得多的事实。这种与γ氧化铝有关的“过量”水被认为是由强烈吸附在氧化铝表面上的分子水组成。两种类型的氧化铝在加热到900 °C时都会产生表面酸性，但η氧化铝的酸性中心强度更大。
Surface properties of well-characterized samples of eta and gamma alumina were studied and compared by means of gas adsorption and immersion calorimetry. From the results obtained, it was concluded that the surface chemistry of an alumina sample may depend to a pronounced degree upon the structure or “type” of alumina being considered. Gamma alumina differed from eta alumina, not only in its pore-size distribution, but also in the fact that the water content of gamma alumina was much greater than that of eta alumina. This “excess” water associated with gamma alumina was regarded as consisting of molecular water strongly adsorbed on the surface of the alumina. Both types of alumina developed surface acidity as they were heated at temperatures up to 900 °C, but the strengths of the acid sites were greater in the case of eta alumina.