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).
A pretreatment-transient reaction product analysis method was applied to study the surface intermediate species in the selective catalytic reduction of NOx with C2H4 over the Co-ZSM-5 catalyst. The reactions of the surface species NCaObHc, formed by the pretreatment of Co-ZSM-5 in a NO/C2H4/O2 gas mixture at 275 ℃ , with a NO/O2 flow produce much more N2 than that with a single NO or O2 flow. Apart from the oxygen content that cannot be determined under the experimental conditions, the average atomic ratio of N:C:H in the surface species was measured to be about 1.0:1.8:5.0 based on the product analysis by mass spectrometry, infrared absorption spectroscopy, and gas chromatography-mass spectrometry.
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