The catalyst of Fe-Mo/ZSM-5 has been found to be more active than Fe-ZSM-5 and Mo/ZSM-5 separately for selective catalytic reduction （SCR） of nitric oxide （NO） with NH3. The kinetics of the SCR reaction in the pre...The catalyst of Fe-Mo/ZSM-5 has been found to be more active than Fe-ZSM-5 and Mo/ZSM-5 separately for selective catalytic reduction （SCR） of nitric oxide （NO） with NH3. The kinetics of the SCR reaction in the presence of O2 was studied in this work. The results showed that the observed reaction orders were 0.74-0.99, 0.01-0.13, and 0 for NO, O2 and NH3 at 350-450℃, respectively. And the apparent activation energy of the SCR was 65 kJ/mol on the Fe-Mo/ZSM-5 catalyst. The SCR mechanism was also deduced. Adsorbed NO species can react directly with adsorbed ammonia species on the active sites to form N2 and H2O. Gaseous O2 might serve as a reoxidizing agent for the active sites that have undergone reduction in the SCR process. It is also important to note that a certain amount of NO was decomposed directly over the Fe-Mo/ZSM-5 catalyst in the absence of NH3.展开更多
以碱性硅溶胶为硅源,双季铵盐表面活性剂(C18-6-3)为模板剂,通过对模板剂的高效洗脱和重复利用,成功合成了高结晶度、低成本的ZSM-5薄层沸石.利用XRD、XRF、SEM、TEM、NH3-TPD、27Al MAS NMR及低温氮气物理吸脱附等分析表征手段探究了...以碱性硅溶胶为硅源,双季铵盐表面活性剂(C18-6-3)为模板剂,通过对模板剂的高效洗脱和重复利用,成功合成了高结晶度、低成本的ZSM-5薄层沸石.利用XRD、XRF、SEM、TEM、NH3-TPD、27Al MAS NMR及低温氮气物理吸脱附等分析表征手段探究了沸石样品的形貌、孔结构与酸性等性质,并评价其正己烷催化裂解反应性能.结果表明,模板剂洗脱过程未对ZSM-5纳米薄层沸石的结构性质等产生明显影响,洗脱的双季铵盐表面活性剂能够合成形貌较好、结晶度高、介孔孔容高的纳米薄层沸石,其催化性能优异,并且合成成本大幅降低,有利于其在工业化生产中的实际应用.展开更多
基金Project supported by the CCSS of Shanxi Provincial Government of China(No.200032,200516)
文摘The catalyst of Fe-Mo/ZSM-5 has been found to be more active than Fe-ZSM-5 and Mo/ZSM-5 separately for selective catalytic reduction （SCR） of nitric oxide （NO） with NH3. The kinetics of the SCR reaction in the presence of O2 was studied in this work. The results showed that the observed reaction orders were 0.74-0.99, 0.01-0.13, and 0 for NO, O2 and NH3 at 350-450℃, respectively. And the apparent activation energy of the SCR was 65 kJ/mol on the Fe-Mo/ZSM-5 catalyst. The SCR mechanism was also deduced. Adsorbed NO species can react directly with adsorbed ammonia species on the active sites to form N2 and H2O. Gaseous O2 might serve as a reoxidizing agent for the active sites that have undergone reduction in the SCR process. It is also important to note that a certain amount of NO was decomposed directly over the Fe-Mo/ZSM-5 catalyst in the absence of NH3.
文摘以碱性硅溶胶为硅源,双季铵盐表面活性剂(C18-6-3)为模板剂,通过对模板剂的高效洗脱和重复利用,成功合成了高结晶度、低成本的ZSM-5薄层沸石.利用XRD、XRF、SEM、TEM、NH3-TPD、27Al MAS NMR及低温氮气物理吸脱附等分析表征手段探究了沸石样品的形貌、孔结构与酸性等性质,并评价其正己烷催化裂解反应性能.结果表明,模板剂洗脱过程未对ZSM-5纳米薄层沸石的结构性质等产生明显影响,洗脱的双季铵盐表面活性剂能够合成形貌较好、结晶度高、介孔孔容高的纳米薄层沸石,其催化性能优异,并且合成成本大幅降低,有利于其在工业化生产中的实际应用.
