Laminar mesoporous structure of modified montmorillonite clays and its formation mechanism |
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| Authors: | Ying Zhang Aiping Chen Chunzhong Li Meifang Luo Zhenliang Xu |
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| Affiliation: | 1. Key Laboratory for Untrafine Materials of the Ministry of Education, East China University of Science and Technology, Shanghai, 200237, China
2. Chemical Engineering Research Center, East China University of Science and Technology, Shanghai, 200237, China
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| Abstract: | Zr-pillared clays were prepared by heating and ultrasonic methods in intercalation process. The resultants were characterized by XRD, N2 adsorption-desorption, SEM, and TG/DTA analysis. Ultrasonic technology accelerated the pillaring process effectively and obtained better ordered structure than by heating method. The specific surface area and pore volume of the Zr-pillared clays increased by about 13 and 3 times respectively. Rare earth metal (Ce) was introduced into Zr-pillared clays by co-intercalation and dipping method. The specific surface area was increased by co-intercalation approach, but it was decreased dramatically by dipping method. Thermal stability of Ce modified samples prepared by co-intercalation method was enhanced in comparison with Zr-pillared clays. Modification mechanism and “corrugation-like” structural mode of intercalation process was proposed basing on the double XRD peaks in small-angle range of pillared clays, which was related to the deformation of silicate layer. |
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| Keywords: | Zr-pillared clay ultrasonic method Ce "corrugation-like" structural model |
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