论文部分内容阅读
采用预处理-瞬态反应产物分析方法定量研究了Co-ZSM-5催化剂上乙烯选择性催化还原氮氧化物反应过程中表面中间物种的组成.催化剂在275℃经0.1%NO-0.05%C2H4-10%O2/Ar混合气处理后生成了表面中间物种NCaObHc,该物种与NO/O2/Ar混合气反应比与单独的NO或O2反应生成更多的N2.通过质谱、红外吸收四组分(CO2,CO,CH4和N2O)分析仪及气相色谱-质谱联用等技术分析了表面中间物种与NO/O2/Ar混合气反应的产物,确定了表面中间物种中三种元素N,C和H的平均原子数之比为1.0∶1.8∶5.0(氧物种由于实验原因很难确定).
Pretreatment-transient reaction product analysis was used to quantitatively study the composition of the intermediate species on the surface of Co-ZSM-5 catalyst catalyzed by selective catalytic reduction of ethylene oxide. The catalytic activity of the catalyst at 275 ℃ was determined by 0.1% NO-0.05% C2H4- The surface intermediate species NCaObHc was formed after 10% O2 / Ar mixture treatment, and this species reacted with NO / O2 / Ar mixture more than either NO or O2 alone to generate more N2. Through mass spectrometry, infrared absorption of four components ( CO2, CO, CH4 and N2O) and gas chromatography-mass spectrometry (GC-MS) were used to analyze the reaction products of the surface intermediate species and the NO / O2 / Ar mixed gas. The three elements N, C and H The average atomic ratio of 1.0: 1.8: 5.0 (oxygen species is difficult to determine for experimental reasons).