摘要
探讨了2,6-二异丙基苯酚气相胺化反应的催化反应机理,提出了气相胺化反应由金属Pd活性中心和弱酸中心共同催化完成。在此基础上,研究了Pd-La/尖晶石催化剂较适宜的预处理条件如:预处理气氛、预处理温度及预处理方式对气相胺化反应性能的影响。220℃氢气气氛是Pd-La/尖晶石催化剂较适宜的预处理条件。采用吡啶吸附-IR和XPS对采用氢气气氛220℃预处理前后的Pd-La/尖晶石催化剂进行了表征,结果表明该预处理促进了催化剂上金属Pd活性中心和弱酸中心的形成。
The catalytic reaction mechanism of the gas-phase amination of 2,6-diisopropylphenol was studied. It was proposed that the gas-phase amination was catalyzed by the metallic Pd active sites and weak acid sites. The effects of pretreatment conditions such as pretreatment atomosphere, pretreatment temperature, and pretreatment method of Pd-La/spinel catalyst were (investigated). Suitable pretreatment for Pd-La/spinel catalyst was to pretreat it in H_2 atmosphere at (220 ℃). The Pd-La/spinel catalyst before and after pretreatment in H_2 at (220 ℃) for 6 h were studied by pyridine-IR and XPS techniques, which showed that this pretreatment method accelerated the formation of metallic (active) sites Pd and weak acid sites on the catalyst.
出处
《华东理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2004年第1期34-37,共4页
Journal of East China University of Science and Technology
