氧化及硫化形式的Co-Mo、Ni-Mo分散在γ-Al2O3上的吡啶吸附红外光谱特征

本文主要测定氧化及硫化形式的Ni-Mo,Co-Mo催化剂的吡啶吸附红外光谱。实验结果表明,MoO₃能很好地分散在催化剂表面上,而表面上的OH基团对这种分散起着重要的作用。红外光谱也表明,助剂Co和Ni的加入对于促进MoO₃在表面上的分散起着一定作用。结合喹啉加氢脱氮动力学结果及热重分析实验,预期表面上的Brosted座位对加氢脱氮并不起很大作用,而一种特殊形式的Lewis座位对加氢脱氮可能起着很重要作用。

THE CHARACTERISTIC OF THE INFRARED SPECTRA OF OXIDIC AND SULFIDED FORM OF NI-MO AND CO-MO CATALYSTS WITH ADSORBED PYRIDINE

The IR spectra of pyridine adsorbed on oxidic and sulfided form of Ni-Mo and Co-Mo catalyst systems were measured. The results showed thatthe OH group played an important role in the dispersion of MoO₃ on thesurface of support and that Ni and Co promotors apparently increased thedispersion of MoO₃ on the support. Kinetic results and the TGA and IRspectra indicated that a certain site of Lewis type,not of Brosted,may playan important role in the HDN reaction of quinoline.