Fe-Ni/中孔矽氧化物觸媒應用於NH3BH3水溶液之釋氫研究

The Fe-Ni/meso-porous silica catalysts for hydrogen generation from ammonia borane aqueous solutions

林怡萍(Yi-Ping Lin)

指導教授 ： 林秀麗

元智大學/工程學院/化學工程與材料科學學系/碩士(2011年)

摘要

硼烷氨化合物 (NH3BH3, ammonia borane, 簡稱AB) 為一高含氫化合物，根據分子式可知其含有19.6 wt% 的氫元素，由於可釋放出高含量的氫氣，為現今相當具有研究潛力的化學氫化物之一。
本研究合成等莫耳比的Fe-Ni合金奈米粒子作為觸媒，並以不同重量摻合比例 (9/1, 8/2, 7/3,…, 1/9) 將Fe-Ni合金擔載於具有六角孔洞結構 (hexagonal structure) 與高比表面積 (500~1000 m2g-1) 的中孔洞氧化矽 (SixOy) 材料MCM-41或SBA-15載體上，形成擔體觸媒。我們在常溫常壓下對AB水溶液進行觸媒催化產氫研究，探討不同重量摻合比例的擔體觸媒、AB水溶液濃度和反應溫度等變因對產氫的影響。由實驗結果可知：(1)不同 [Fe-Ni]/[ SixOy] 重量摻合比例的擔體觸媒，在0.2 wt% AB水溶液中，Fe-Ni/MCM-41 (8/2, g/g) 與 Fe-Ni/SBA-15 (5/5, g/g) 這二個擔體觸媒有較佳的釋氫催化效率；(2)產氫速率隨著AB水溶液的濃度增加而增加；(3) 隨著溫度上升，催化反應速率增加。

關鍵字

產氫觸媒 ； 硼烷氨化合物水解 ； 中孔洞氧化矽

並列摘要

Nowadays, the search for effective and safe hydrogen-storage material is one of the most difficult challenges toward hydrogen powered society as a long-term solution for a secure energy future. Ammonia borane (NH3BH3, AB) is nontoxic, crystalline soild at room temperature, stable in air and water, can be handled at room temperature, contains high hydrogen content (19.6 wt%), exceeding that of gasoline and making itself an attractive candidate for chemical hydrogen-storage applications.
In this study, we prepare meso-porous material (SBA-15, MCM-41) embedded with Fe-Ni nano-alloy particles as the catalysts for the hydrogen generation from AB aqueous solutions. The following conclusions are obtained: (1) For 0.2 wt% AB aqueous solution, the catalysts with [Fe-Ni]/[MCM-41] = 8/2 g/g and [Fe-Ni]/[SBA-15] = 5/5 g/g have the best catalysis efficiency; (2) The catalysis efficiency of the present catalysts is dependent on AB concentration in the aqueous solutions; (3) The catalysis efficiency increases with increasing temperature.

並列關鍵字

ammonia borane ； hydrolysis of ammonia borane ； meso-porous silicate scaffold

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