鋅鋁層狀雙氫氧化物的合成與鑑定以及其應用於氫氣吸附之探討

Synthesis and Characterization of Zn-Al Layered Double Hydroxide and Its Applications in Hydrogen Adsorption

許哲倫(Che-Lun Hsu)

指導教授 ： 鄭淑芬

國立臺灣大學/理學院/化學研究所/碩士(2011年)

https://doi.org/10.6342/NTU.2011.01921

摘要

本論文的研究目的是藉由在層間夾入不同陰離子，以製備出具有氫氣吸附能力的層狀雙氫氧化物 (layered double hydroxides)。以共沉澱法在鹼性條件下製備所得之鋅鋁層狀雙氫氧化物，層狀物本身厚度為4.8 Å，隨著在層間夾入不同的陰離子而造成不同的層間距，並且探討層間含不同陰離子對氫氣吸附能力的影響。所得材料均經由XRD確認其層狀結構，ICP-MS確認其Zn/Al比例，TGA觀察其熱重損失及推導出化學式，SEM觀察其形狀及粒子大小，最後由BET測量比表面積、孔洞大小和低溫常壓下之氫氣吸附量。結果顯示，在所合成出之含羧酸根的鋅鋁層狀氫氧化物的系列當中，不同陰離子對氫氣吸附的變化是1,4-biphenyldicarboxylate (BPDCA) > p-toluate (PTA) > terephthalate (TA)。其中，層間夾入以莫爾比1/1的混合1,4-biphenyldicarboxylate (BPDCA) 和acetate (AA) 陰離子，具有最好的氫氣吸附效果，可達到0.268wt%。而含硼氧陰離子於層間的層狀雙氫氧化物皆有大於200 m2/g 的高表面積，應用於氫氣吸附時，所有含硼氧陰離子樣品的吸附量也較含羧酸根之樣品高。

關鍵字

層狀雙氫氧化物 ； 儲氫 ； 羧酸根 ； 硼氧陰離子

並列摘要

Zn-Al layered double hydroxides (LDHs) materials intercalated with different anions were synthesized by co-precipitation method under pH values around 9. Given that the thickness of a brucite-like layer is 4.8 Å, the gallery height is varied by intercalating different anions in between the layers. The relationship between the different intercalated anions and the hydrogen adsorption capabilities of the resultant materials were examined. All the LDHs materials were characterized with XRD to confirm the layered structure and ICP-MS to confirm the Zn/Al ratio . The chemical formulae were determined by the weight losses in TGA. The particle morphologies and sizes of the Zn-Al LDHs were examined by SEM. The specific surface areas and pore volumes were determined from the nitrogen adsorption isotherm at 1 atm and 77K. Finally, the hydrogen uptakes of the LDHs were measured at 1atm and 77K using the volumetric method. The hydrogen uptakes of the LDHs containing different anions decrese in the order of 1,4-biphenyldicarboxylate (BPDCA) > p-toluate (PTA) > terephthalate (TA) . Among them, Zn-Al LDH intercalated with a 1:1 ratio of mixed 1,4-biphenyldicarboxylate (BPDCA) and acetate (AA) gave the highest hydrogen uptake of 0.268 wt%. The LDHs containing borate have surface area larger than 200 m2/g, and the hydrogen uptakes are more than LDHs containing carboxylate anion.

並列關鍵字

Layered double hydroxides ； hydrogen storage ； carboxylate ； borate

參考文獻

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