本研究旨在以簡易的＂pH-jump＂法合成二氧化矽奈米孔洞材料，依循環境友善及高經濟價值的理念下，去除界面活性劑的使用，使矽酸鹽在沒有結構導引的情況下自然地縮合產生大小均一且可調控的12-30 nm的二氧化矽小顆粒，當顆粒彼此堆積膠連會形成孔徑分佈極寬（6-50 nm）且高總孔體積（>1.6 cm3g-1）的二氧化矽奈米孔洞材料。除此之外，於合成系統中添加適當的金屬前驅物，亦可以一步驟共沉澱出負載高分散性金屬的二氧化矽奈米孔洞材料。我們更深入地分析鑑定負載銅的二氧化矽奈米孔洞材料後發現，此材料中銅與二氧化矽載體的作用較強，導致銅不易被還原及活化，進而影響了催化活性的表現。因此，我們以降低銅與二氧化矽間的作用為修正之方向，藉由調整合成步驟中加入金屬前驅物的時間點，經過鍛燒活化後，顯著地提升了其於丙烯選擇性氧化反應中的催化效能，丙烯醛產率可達5.7%，雖然與其他的銅觸媒相比沒有突破性的表現，但依循降低金屬與載體的作用進行改良，預期能獲得更佳的催化效果。

This thesis aimed to synthesize nanoporous silica materials by
using the simple ＂pH-jump ＂method. Base on the idea of eco-friendly responsibility and raising economic value, surfactants will not be used. In the absence of structural guidance, silicate species naturally condense into small and tunable 12-30 nm silica particles of a uniform size. When the particles are glued together, they form the nanoporous silica material with extremely wide pore size distribution (6-50 nm) and a high total pore volume (>1.6 cc/g). Furthermore, adding suitable metal complexes in the synthesis mixture could also achieve co-precipitation of highly dispersed metal-containing nanoporous silica materials. After further analysis of the copper-containing nanoporous silica material, we found that the copper species in this material have stronger interaction with silica support, resulting in the copper being hard to hydrogen reduction, and thus affecting the catalytic activity. Therefore, in order to reduce the interaction between copper and silica support, we adjusted the timing of adding the metal precursor and activated them by calcination. By such approach, the activity of selective oxidation of propylene was significantly improved. The yield of acrolein can reach 5.7%. Although there are no breakthrough performance compared with other copper catalysts, we expected that a better catalytic effect can be obtained by tuning the interaction between the metal and the silica support.

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