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復旦大學Songhai Xie和Minghua Qiao課題組--鐵-鉀/單壁碳納米管有效催化二氧化碳加氫成重烯烴
      這里制備了單壁和多壁碳納米管支撐的鐵-鉀催化劑(定義為FeK/SWNTs和FeK/MWNTs),對其CO2加氫性質進行了評估。在CO2加氫成烯烴過程中,FeK/SWNTs(62.3%)催化劑的選擇性要優于FeK/MWNTs催化劑(52.4%)。值得注意的是,對于產物為重烯烴FeK/SWNTs的選擇性更高,而FeK/MWNTs對輕烯烴的選擇性更高。大曲率SWNTs有更多電子富集在外表面,Hägg 碳化物豐度更高碳化物,以及與輕質烯烴更強的相互作用,可以合理化FeK/SWNTs用于CO2加氫成重烯烴的出色行為。FeK/SWNTs的催化性能在120 h穩定性測試中僅顯示出輕微的變化,證明了SWNTs是一種有前景的催化劑載體,可用于從溫室氣體CO2中生產附加值的化學品。
 
Figure 1. (a, b) SWNTs 和 FeK/SWNTs,(c, d) MWNTs和 FeK/MWNTs催化劑的N2物理吸附等溫曲線和孔徑尺寸分布。                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
 
Figure 2. FeK/SWNTs和FeK/MWNTs催化劑的XRD圖。
 

Figure 3. (a) FeK/SWNTs 和 (b) FeK/MWNTs 催化劑的TEM圖和高斯擬合的粒徑尺寸分布,圖a中插圖為 HRTEM 圖。
 

Figure 4. (a)FeK/SWNTs 和 FeK/MWNTs催化劑的 Raman譜,
(b) 催化劑和相應支撐物的G帶比較。
 

Figure 5. (a) FeK/SWNTs 和 (b) FeK/MWNTs催化劑在CO2加氫反應中的碳氫化合物產物分布。
 
     該研究工作由復旦大學Songhai Xie和Minghua Qiao課題組于2020年發表在ACS Catalysis期刊上。原文:Iron–Potassium on Single-Walled Carbon Nanotubes as Efficient Catalyst for CO2 Hydrogenation to Heavy Olefins。

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