摘要
环氧丙烷是一种重要的化工中间体,广泛应用于化工、医药、食品、轻工等行业。环氧丙烷的传统工业生产方法——氯醇法和共氧化法存在着很多缺点,而最新开发的H2O2氧化法则存在催化剂寿命短、H2O2利用率低等问题没有根本解决。本文对环氧丙烷更为有前景的生产方法——以分子氧为氧源的气相选择性氧化丙烯的研究进展进行了总结,着重介绍了丙烯气相环氧化反应中的金、银、铜、铋-钼、钒、熔融盐催化剂以及其他以氧气为氧源的金属催化剂的研究进展,同时对丙烯气相氧化过程中涉及到的金催化剂的Ti活性位机理,铜、银催化剂上的金属环氧化中间物机理,银及其他金属的自由基机理作了相应的介绍。
Propylene oxide （PO） is an important intermediate chemical and is widely used in chemical, pharmaceutical, food, light industry and other industries. In industry, PO is produced via multiple reaction steps in the liquid phase, using hazardous chlorine or costly organic hydroperoxides as oxidants. Considering the inherent defects of the traditional processes the chlorohydrin and hydroperoxide process, a new production technology that propylene oxide production via hydrogen peroxide （HPPO） has been developed, but many problems such as the catalyst mass transfer limitation, the catalyst deactivation and regeneration, and the need of a dedicated hydrogen peroxide production plant are encountered. So, a more attractive method for PO production with molecular oxygen by gas-phase is discussed in this paper. The most important new developments for the production of propylene oxide discussed in this paper are concentrated on the supported gold, silver, copper, vanadium, molten salt catalysts and other catalysts that used molecular oxygen as the oxygen source. At the same time, the mechanism involved in the propylene epoxidation such as the Ti active sites mechanism in Au/Ti catalysts, the OMMP （OMMP refers to a ring made up of one oxygen atom, two metal atoms and a propylene unit） intermediate mechanism in silver and copper catalysts and the radical mechanism in silver and other metal oxide catalysts are also mentioned in this paper.
出处
《化学进展》
SCIE
CAS
CSCD
北大核心
2014年第8期1307-1316,共10页
Progress in Chemistry
基金
国家自然科学基金项目(No.2097630)资助~~
关键词
丙烯
环氧丙烷
反应机理
选择性氧化
金属氧化物
propylene
propylene oxide
reaction mechanism
selective oxidation
metal oxides
