【摘要】 本文用红外光谱法考察了CD₃OD 在改性前后的HZSM-5催化剂上的吸附作用,提出了其吸附态模型及吸附机理。发现当CD₃OD 吸附在HZSM-5与Al 改性的HZSM-5（简称AlHZSM-5）后,于180—200℃下抽空20分钟,均有甲氧基生成,而在300℃左右抽空20分钟,则甲氧基脱除,B 酸中心的吸收峰再现。在Mg 改性的HZSM-5催化剂（简称Mg HZSM-5）上则大不相同,所吸附的CD₃OD 在各种温度下脱附时均未发现有甲氧基生成;在200—550℃范围内,这些催化剂的红外谱图上在2000—2300cm^-1区间还出现强弱不等的CD 伸缩振动吸收峰,这可能是由于吸附在强的L 酸中心上的CD₃OD 或CD₃OCD₃引起的。更多还原

【Abstract】 In the present work,the adsorption of CD₃OD on HZSM-5 beforeand after modification has been studied by IR and also its adsorptionmodel and adsorption mechanism are suggested.Methoxyl radical isdetected when CD₃OD adsorbed on HZSM-5 or on Al modified HZSM-5is evacuated for 20 min at 180—200℃.When the sample is evacuated at300℃ for 20 min,methoxyl radical will desorb from the surface andthe absorption bands on B-acid sites reappear.However,the HZSM-5modified by Mg exhibits differently.If we evacuate the system afterCD₃OD adsorption at different temperature,no methoxyl is detected butabsorption bands of C—D appears at 2000—2300 cm^-1with different in-tensity.These may be due to the CD₃OD or CD₃OCD₃ molecules absorbedon the strong L-acid sites.更多还原