摘要
采用搅拌槽式微量天平流动反应器,在硫化态钴钼催化剂上考察了氢化吡啶及2,6-二甲基吡啶两种含氮毒物对2-甲基呋喃加氢脱氧及2-甲基噻吩加氢脱硫反应的毒化过程。研究发现:钴钼催化剂上加氢脱氧与加氢脱硫活性位均具有空间位阻效应。这一事实证明,加氢脱氧与加氢脱硫活性位的中毒是以毒物中氮原子吸附的方式发生的,而不是毒物环上的π键与活性位键合的结果。同时少量毒物2,6-二甲基吡啶吸附于催化剂表面时,不仅未使两种氢解反应中毒,反而产生轻度的促进作用。就此而论,这两种活性位具有相似之处,然而,同一毒物作用下加氢脱氧与加氢脱硫中毒过程的相对活性曲线的明显区别似又表明加氢脱氧位与加氢脱硫位之间存在差异。
Poisoning of 2-methylfuran hydrodeoxygenation(HDO)and 2-methylthiop- hen hydrodesulfurization(HDS)over a sulfided CoMo/Al_2O_3 catalyst by piperidine (PIP)and 2,6-lutidine(LUT)was investigated in a stirred tank,microbalance reactor.It has been found that the active sites for both HDO and HDS are sterically hindered sites relative to adsorption.It is shown that poison adsor- ption that occurs through coordination of N atom in active sites results in poi- soning of HDO and HDS sites,rather than by π-bonding of the ring,as the latter should not exhibit a steric hindrance.When a small amount of LUT was adsorbed on the surface of catalyst,deactivation of HDO and HDS did not occur,on the contrary,both hydrogenolyses were actually promoted to a small extent.With respect to the properties mentioned above,the active sites of both HDO and HDS seem to have some similarities.However,a significant difference between relative activiy curves of HDO and HDS by the same poi- son implies that HDO sites and HDS sites are somewhat different from each other.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
1989年第4期9-17,共9页
Acta Petrolei Sinica(Petroleum Processing Section)
