本文選題：氨合成 + 固相反應(yīng)　； 參考：《分子催化》2017年03期

【摘要】：我們以商業(yè)預(yù)還原的維氏體(Fe_(1-x)O)氨合成催化劑為載體,采用Fe(NO)_3·9H_2O和H_2C_2O_4·2H_2O進行原位室溫固相反應(yīng)制備納米鐵或微米鐵修飾的鐵基氨合成催化劑,并通過XRD、SEM、TG-DTG、H_2-TPR等進行了表征.結(jié)果表明:Fe(NO)_3·9H_2O和H_2C_2O_4·2H_2O室溫固相反應(yīng)完全生成產(chǎn)物Fe_2(C_2O_4)_3·5H_2O,且產(chǎn)物分散于載體維氏體催化劑表面.通過納米鐵-微米鐵的修飾,催化劑的氨合成活性有很大提高且穩(wěn)定性好.催化劑活性隨著Fe負載量的增加先增加后降低,負載量5%時催化活性最好,反應(yīng)器出口氨濃由450℃(12.4%)、425℃(11.0%)、400℃(9.4%)分別提升至450℃(15.6%)、425℃(14.8%)、400℃(13%).通過一步簡單的修飾,維氏體催化劑的氨合成活性提高約25%~38%.由于焙燒和還原,生成的Fe_(1-x)O或鐵粒子與鐵催化劑表面發(fā)生強相互作用,因此,反應(yīng)過程中納米鐵或微米鐵粒子能穩(wěn)定存在,催化劑有較高的穩(wěn)定性.
[Abstract]:In situ solid state reaction at room temperature with Fe(NO)_3 9H_2O and H_2C_2O_4 2H_2O was used to prepare iron nanoparticles or iron modified iron based ammonia synthesis catalysts. The catalysts were characterized by XRDX SEMU TG-DTGN H2-TPR and so on. The results showed that the product Fe_2(C_2O_4)_3 _ 5H _ 2O was completely formed by solid state reaction of Fe_2(C_2O_4)_3 _ 5H _ 2O with H_2C_2O_4 2H_2O at room temperature, and the product was dispersed on the surface of the supported Vickers catalyst. The ammonia synthesis activity of the catalyst is greatly improved and the stability is good through the modification of nanometer iron-micron iron. The catalytic activity increased first and then decreased with the increase of the amount of Fe loading. The catalytic activity was the best when the loading amount was 5. The ammonia concentration at the outlet of the reactor was increased from 450 鈩，

本文編號：1848316