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首頁 / product / Nano Material (BTB)

Nano Gold Raw Material

NT$3,000

奈米材料原料不提供線上下單,請先來電洽詢:(02)87800086 #100 陳經理

允許無庫存下單

分類: Nano Material (BTB)
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  • Nano Material (BTB)
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  • 描述

當金顆粒微小至數奈米時,金的物理和化學性質會隨粒徑奈米化而改變,隨著粒徑縮小,比表面積大幅增加、粒子邊緣及裸露角增加等等,金的表面並形成凹凸不平的原子台階,而呈現獨特催化活性,如果再搭配可還原性金屬氧化物載體即可成為高活性的奈米金觸媒。

金具化學惰性,不溶於酸,僅溶於王水和氰鹽溶液。黃金的許多應用是基於它的獨特性質,這是由於黃金具有獨特且相對收縮的6s軌道,相較於週期表中的位置黃金具有比銀更小的原子半徑(金屬半徑僅為0.1442奈米),形成很強之原子內聚力。金亦是陰電性最高之金屬(可和銫形成Cs+Au-),其氧化電位高達+1.691 V (Au+1/Au0;Au+3/Au0為+1.4 V),不易有電子轉移,所以不利於進行氧化還原反應。

奈米金觸媒的反應溫度較低,最佳操作溫度為200~350K,遠低於鉑觸媒的操作溫度400~800K。且金觸媒不像鉑觸媒,在高溼度的存在下對觸媒活性是有利而非致命的。雖然黃金觸媒未必能取代鉑觸媒的地位,但在某些特殊情況下金觸媒可能是更好的選擇。如利用適當方法合成的金觸媒具有在室溫將一氧化碳氧化的能力,比常規合成的鈀或鉑觸媒更好。

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  • About us
    • About Litten Inc.
    • History of Photocatalyst
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      • Principles of Photocatalyst
      • Photocatalytic Efficacy
      • FAQs
      • Academic References
    • Seven technology breakthroughs
      • Fixing by Spraying Directly
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