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γ-Al₂O₃表面原位合成Ni-Al-CO₃ LDHs研究

In Situ Synthesis of Ni-Al-CO₃ LDHs on the Surface of γ-Al₂O₃

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【Author】 MAO Shu-Bing LI Dian-Qing ZHANG Fa-Zhi D. G. Evans DUAN Xue*(Key Laboratory of Science and Technology of Controllable Chemical Reactions,Ministry of Education, Beijing University of Chemical Technology, Beijing 100029)

【机构】北京化工大学可控化学反应科学与技术基础教育部重点实验室；北京化工大学可控化学反应科学与技术基础教育部重点实验室北京100029；北京100029；北京100029；

【Abstract】 Ni-Al-CO3 LDHs/γ-Al2O3 have been prepared using an in-situ synthesis technique. NH3·H2O was chosen as activation agent of Al on the γ-Al2O3 surface as well as precipitant. Ni-Al-CO3 LDHs/γ-Al2O3 was synthesized by controlling the reaction conditions such as temperature, concentration of Ni2+ and initial pH. The crystalline structure, chemical composition and porous structure were characterized by means of XRD, FT-IR, TG-DTA, 27Al MAS-NMR and N2 adsorption-desorption. The resulting sample of Ni-Al-CO3 LDHs/γ-Al2O3 possesses higher specific area and narrower pore distribution, in which Ni-Al-CO3 LDHs are located on the surface of γ-Al2O3 and share the same Al-O bonds with the γ-Al2O3 lattice. Finally a possible structural model was proposed to account for the porous characters of Ni-Al-CO3 LDHs/γ-Al2O3.更多还原

【关键词】 LDHs；含镍LDHs；表面原位合成；孔结构；
【Key words】 LDHs LDHs containing Ni in-situ synthesis pore structure；

【基金】国家自然科学基金重点项目(No.90306012)。