金属ケイ素を用いたGa, A1-ZSM-11固溶体の合成

概要

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Silicalite 2,ZSM-11,Ga-ZSM-11 and Ga, Al-ZSM-11 solid solution were hydrothermally synthesizd using silicon powder (99.999%) as a silica source. The SiO_2/Al_2O_3 molar ratio of Silicalite 2 was highly siliceous to be 2x10^5. The maximum Ga and Al contents for end-members were 2.62Ga and 2.40Al/u.c., respectively. Crystal shape and dimension of products varied depending on initial H_2O content. Large prismatic crystals up to 20μm were grown with the increase of H_2O content, whereas small spherulites (few )un) composed of lath-like crystals of several hundreds were formed in low H_2O contents. Synthesized Ga, Al-ZSM-11 can be regarded as nearly ideal solid solution between Ga and Al at oms from the variation of Ga_2O_3/(Al_2O_3+Ga_2O_3) molar fraction. This indicates that there is no site preference between both elements in ZSM-11 structure. DTA profiles of products showed exothermic peaks ranging from ca.200 to 550℃ by the thermal decomposition of TBA. They varied depending on only the Ga and Al contents of end-members, regardless of the difference in chemical element. As a results, it is not easy to distinguish between both the end-members from the DTA patterns. Similarly the DTA curves of solid solution varied only with the (Ga+AD contents, regardless of changing Ga/Al (or Al/Ga) ratio. This idicates that there is little difference between TBA-Ga interaction and TBA-AI one in ZSM-11 strucure.
日本粘土学会の論文
1992-03-25