奈米α-Al2O3/Ni核殼結構複合粉體之製備

本研究之目的在於開發奈米α-Al2O3粉體觸媒，吾人在奈米α-Al2O3粉體表面披覆上金屬，使其作為高溫觸媒載體，作者選擇Ni為金屬披覆層，使其與α-Al2O3形成核-殼結構之複合粉體。實驗方面採用化學還原法，利用聯胺(N2H4)作為還原劑，將金屬鹽前驅物NiSO4．6H2O、Ni(AC)2．6H2O、NiCl2．4H2O中的金屬Ni離子還原，並在α-Al2O3上形成金屬Ni披覆層。實驗分兩階段，先調整濃度、溫度、 pH值及反應時間等參數，另外輔助生長抑制劑於反應中，獲得我們要的奈米鎳粒子，然後進行各項物性及化性分析，包括XRD、SEM、TEM、Zeta Potential等，獲得理想的製程條件後，將其運用於披覆實驗中，最後輔助PSS及錯離子於反應溶液中，幫助核-殼結構之形成。在鹼性環境下(pH值等於11)、溫度大於80℃，且金屬前驅鹽為低濃度時，可以將前驅鹽完全還原成鎳，並披覆於α-Al2O3上形成不完全核-殼結構。

關鍵字

α-Al2O3觸媒；核-殼結構；化學還原

並列摘要

In this study, the coating of Ni on the fine α-Al2O3 (<200nm) surface was performed using chemical reducing process. The processing conditions such as pH value , temperature , concentration of metal salt precursor , and response time were optimized though analyzing the characteristic of coating layer. A typical procedure was as follows: NiCl2．6H2O in water solution was added to α-Al2O3 suspension . The suspension was then mechanical stirred and adjusted the pH to 11 , at temperature of 80℃ for 30 min , then carry on every physical and chemical analyses , including XRD、FTIR、TEM and SEM.

並列關鍵字

α-Al2O3 catalyst ； core-shell structure ； chemical reduction

參考文獻

[1] Richard P. Feynman，Surely You’re Joking Mr. Feynman：Adventures of a Curious Character，台北：天下文化（2003）

[2] M. Henini and J. M. Karam，Low dimensional structures and devices: micro- and nano-technology，Microelectronics Journal，28, 4（1997）367-370

[5] WTEC Panel Report on Nanostructure Science and Technology R&D Status and Trends in Nanoparticles，Nanostructured Materials and Nanodevices，8（1999）70-75

[6] Ineke Malsch，Nanotechnology in Europe： Scientific Trends and Organizational Dynamics，Nanotechnology，10, 1 （1999）1-7

[19] Y. D. Li, C. W. Li, H. R. Wang, L. Q. Li, Y. T. Qian，Preparation of nickel ultrafine powder and crystalline film by chemical control reduction，Materials Chemistry and Physics，59（1999）88-90

國際替代計量

奈米α-Al2O3/Ni核殼結構複合粉體之製備

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