ACID ACTIVATION OF A PALYGORSKITE WITH HCL - DEVELOPMENT OF PHYSICOCHEMICAL, TEXTURAL AND SURFACE-PROPERTIES
ACID ACTIVATION OF A PALYGORSKITE WITH HCL - DEVELOPMENT OF PHYSICOCHEMICAL, TEXTURAL AND SURFACE-PROPERTIES
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DOI：
10.1016/0169-1317(95)00007-q
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发表时间：
1995-10-01
影响因子：
5.6
通讯作者：
POZAS, JMM
中科院分区：
文献类型：
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作者：
BARRIOS, MS;GONZALEZ, LVF;POZAS, JMM
将来自Bercimuel（Segovia，西班牙）的palygorantine用1.0、3.0、5.0和7.0 N KCl溶液在回流下处理1小时。通过XRD、FT-IR光谱、热分析、TEM和77 K下的氮气吸附-脱附等温线对所得固体进行了表征。酸处理伴随着八面体阳离子-Mg（II）、Al（III）-的去除和来自四面体片的无定形二氧化硅的形成而进行。在处理过程中观察到比表面积的重要增加，在用5.0 N HCl处理的样品中达到最大值286 m（2）/g。处理后得到的二氧化硅保持了天然坡缕石的纤维形态。在处理过程中没有观察到微孔的产生。
A palygorskite from Bercimuel (Segovia, Spain) was treated with 1.0, 3.0, 5.0 and 7.0 N solutions of KCI for 1 hour under reflux. The solids obtained were characterized by XRD, FT-IR spectroscopy, thermal analyses, TEM and nitrogen adsorption-desorption isotherms at 77 K. The acid treatment runs with the removal of the octahedral cations -Mg(II), Al(III) -and the formation of amorphous silica from the tetrahedral sheet. An important increase in the specific surface area was observed during treatment, reaching a maximum of 286 m(2)/g in the sample treated with 5.0 N HCl. The silica obtained after the treatments maintains the fibrous morphology of natural palygorskite. No creation of microporosity is observed during the treatment.