摘要
本文采用TPD和原位发射红外光潜法研究了合成低碳醇Cu/Zn/Mg/K催化剂的活性中心以及H_2和CO在催化剂上的吸附行为。结果表明,该催化剂上存在两种性质接近的活性中心。CO和H_2在活性中心上发生竞争吸附。还发现在ZnO上有强吸附的氢,它在本实验条件下不能直接参加反应,但可通过溢流转移吸附至Cu活性中心上。通过对比CO/H_2在高活性和已失活催化剂上反应过程中不同的原位发射红外光谱,初步判断在实际反应条件下活性中心是在锌协同作用下带微量正电荷的Cu^(δ+)和Cu^(δ+′),它们是表面吸附物与催化剂活性中心组分间相互作用的结果。
The characteristics of the active sites and the adsorption behavious of CO and H_2 on Cu/Zn/Mg/K catalyst were investigated using in situ emission IR and TPD.The results indicated that two kinds of active sites exist on the catalyst surface and CO and H_2 are adsorbed competitively on one of them.Strongly adsorbed hydrogen on ZnO was found which showed no direct hydrogenation activity but could migrate to the active sites.The processes of adsorption and surface reaction of CO/H_2 on the catalyst were studied by means of in situ emission IR.By comparing the IR emisson spectra of an active catalyst with that of an deactivated catalyst,it has been verified that the active sites under reaction conditions existed in the form of Cu^(8+)and Cu^(8+)′ resulted from the interaction of the adsorbates with copper under the synergetic action of ZnO.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1991年第3期232-237,共6页
Journal of Fuel Chemistry and Technology
关键词
活性
催化剂
铜基
低碳醇
higher alcohol
active sites
copper catalyst
