Changes in the Basicity and Species on the Surface of Me(OH)2-SiO2 (Me = Ca, Mg, Sr) Mixtures Due to Mechanical Activation
Changes in the Basicity and Species on the Surface of Me(OH)2-SiO2 (Me = Ca, Mg, Sr) Mixtures Due to Mechanical Activation
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机械活化引起的 Me(OH)2-SiO2 (Me = Ca, Mg, Sr) 混合物表面碱度和物种的变化
DOI：
10.1006/jssc.1995.1149
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
M. Senna
中科院分区：
文献类型：
--
作者：
Tomoyuki Watanabe;J. Liao;M. Senna
用滴定、程序升温、脱附和红外光谱等方法研究了机械活化对碱土金属氢氧化物表面碱性的影响，结果表明，机械活化使碱土金属氢氧化物表面碱性增加的顺序为Sr（OH）2 > Ca（OH）2 > Mg（OH）2，在研磨Me（OH）2 -SiO2混合物时，氢氧化物表面碱性的增加和差异更为显著。由于成分之间的机械化学相互作用。双齿吸附的CO2，发现专门与SiO2的地面混合物，只能解释形成新的-Me-O-Si键。这表明在研磨过程中由于电荷转移而开始形成碱土金属硅酸盐。
Abstract Mechanical activation increased the surface basicity of the alkaline earth hydroxides in the order Sr(OH) 2 > Ca(OH) 2 > Mg(OH) 2 , as determined by titration, temperature-programmed, desorption, and FT-IR. The increase and the difference in the basicity between the hydroxides became more significant in the case of grinding Me (OH) 2 -SiO 2 mixtures, as a result of mechanochemical interactions between the ingredients. Bidentate adsorption of CO 2 , found exclusively on the ground mixture with SiO2, is only explained by the formation of new - Me -O-Si- bonding. This indicates the incipient formation of alkaline earth silicates as a result of charge transfer during grinding.