Nanocomposites of PAn-DBSA/γ-Fe 2O 3 with electrical and ferromagnetic behavior(σ= 2.18×10 -3-5.00×10 -5 S/cm, M s=3.7-16.6 m 2·A/kg, H c=8 805.2-9 133.1 A/m) were prepared by a chemical modification-...Nanocomposites of PAn-DBSA/γ-Fe 2O 3 with electrical and ferromagnetic behavior(σ= 2.18×10 -3-5.00×10 -5 S/cm, M s=3.7-16.6 m 2·A/kg, H c=8 805.2-9 133.1 A/m) were prepared by a chemical modification-redoping method in a neutral medium. The products were characterized by TEM, XRD, UV-Vis, four-probe method, and magnetometer. The results indicate that the electrical and magnetic properties of the nanocomposites strongly depend on γ-Fe 2O 3 content. With the increase of γ-Fe 2O 3 content, the electrical conductivity is decreased and saturation magnetization is increased.展开更多
采用沉淀法制备磁性γ-Fe2O3脱硝催化剂,通过瞬态动力学方法考察NH3、O2气体浓度对催化剂选择性催化还原(SCR)脱硝率的影响,在消除内外扩散阻力基础上应用稳态动力学研究方法构建SCR脱硝本征反应动力学模型。实验结果表明:NH3能快速在...采用沉淀法制备磁性γ-Fe2O3脱硝催化剂,通过瞬态动力学方法考察NH3、O2气体浓度对催化剂选择性催化还原(SCR)脱硝率的影响,在消除内外扩散阻力基础上应用稳态动力学研究方法构建SCR脱硝本征反应动力学模型。实验结果表明:NH3能快速在催化剂表面活性位上吸附活化;NO的吸附及其活性过渡中间体的形成在SCR反应中起控制作用;O2浓度小于1%时,其浓度的提高促进了磁性γ-Fe2O3催化剂SCR反应进行;在试验条件下,磁性γ-Fe2O3催化剂的NO、NH3、O2的反应级数分别为0.41、0、0.27,但当O2浓度>1%时,其反应级数为0,研究得到磁性γ-Fe2O3催化剂SCR表观反应活化能为28.77 k J/mol。展开更多
文摘Nanocomposites of PAn-DBSA/γ-Fe 2O 3 with electrical and ferromagnetic behavior(σ= 2.18×10 -3-5.00×10 -5 S/cm, M s=3.7-16.6 m 2·A/kg, H c=8 805.2-9 133.1 A/m) were prepared by a chemical modification-redoping method in a neutral medium. The products were characterized by TEM, XRD, UV-Vis, four-probe method, and magnetometer. The results indicate that the electrical and magnetic properties of the nanocomposites strongly depend on γ-Fe 2O 3 content. With the increase of γ-Fe 2O 3 content, the electrical conductivity is decreased and saturation magnetization is increased.
文摘采用沉淀法制备磁性γ-Fe2O3脱硝催化剂,通过瞬态动力学方法考察NH3、O2气体浓度对催化剂选择性催化还原(SCR)脱硝率的影响,在消除内外扩散阻力基础上应用稳态动力学研究方法构建SCR脱硝本征反应动力学模型。实验结果表明:NH3能快速在催化剂表面活性位上吸附活化;NO的吸附及其活性过渡中间体的形成在SCR反应中起控制作用;O2浓度小于1%时,其浓度的提高促进了磁性γ-Fe2O3催化剂SCR反应进行;在试验条件下,磁性γ-Fe2O3催化剂的NO、NH3、O2的反应级数分别为0.41、0、0.27,但当O2浓度>1%时,其反应级数为0,研究得到磁性γ-Fe2O3催化剂SCR表观反应活化能为28.77 k J/mol。
