NH4+ZSM-5分子筛(SiO2/Al2O3:30/1)的酸性位表征: AutoChem的脉冲化学吸附和TPD应用
Figure 1. The amine reacts with acid sites to decompose into propylene and ammonia via a mechanism analogous to Hofmann Elimination.
Figure 2. Example of mass spectrometer signal during an area-volume calibration.
Figure 3. Thermal conductivity data from the AutoChem.
Figure 4. Mass spectrometer peak results.
此外,图3和图4表明,热导检测方法可检测到化学吸附中残留的胺和氨,而质谱仪检测则已区分出丙烯信号,从而可以计算酸位点的浓度。对图4中丙烯信号积分后可得峰面积Apms,酸位点浓度Nas可通过下式进行计算:
以下是由图4中数据得到的计算值,浓度值的单位为酸位微摩尔/每克分子筛。
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