On the influence of water traces on the acidity measurement of amorphous aluminosilicates
On the influence of water traces on the acidity measurement of amorphous aluminosilicates
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微量水对非晶硅铝酸盐酸度测量的影响
DOI：
10.1016/j.cattod.2013.10.054
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发表时间：
2014
期刊：
影响因子：
5.3
通讯作者：
H. Yasuda
中科院分区：
文献类型：
--
作者：
J. Blanchard;J. Krafft;C. Dupont;C. Sayag;Toshikazu Takahashi;H. Yasuda
为了测量它们的酸度，预先在450 °C或更高的温度下处理无定形铝硅酸盐，以除去吸附在它们表面上的水。我们将在这项研究中表明，在标准过程中的酸度测量低温CO吸附，微量的水存在于设置可能会干扰酸度测量解吸从设置和吸附在样品上。我们还将证明，水的相互作用发生在温和和强刘易斯网站，并导致检测到更强的布朗斯特网站比那些天然存在于无定形铝硅酸盐。最后，我们将提出一个实验程序，允许避免对水的样品上的吸附，并将清楚地确定与吸附在刘易斯网站之前和之后的CO的H2O和D2O的带的位置。
For the measurement of their acidity, amorphous aluminosilicates are beforehand treated at temperature of 450 °C or higher in order to remove water adsorbed on their surface. We will show in this study that, during the standard course of an acidity measurement by low temperature CO adsorption, traces of water present in the setup may perturb the acidity measurement by desorbing from the setup and adsorbing on the sample. We will also demonstrate that the interaction of water occurs on mild and strong Lewis sites and leads to the detection of stronger Brønsted sites than those natively present in the amorphous aluminosilicate. We will finally propose an experimental procedure that allows avoiding the adsorption on water on the sample and will clearly identify the position of the band associated with H2O and D2O adsorbed on Lewis sites before and after addition of CO.