固定床反应器中Ti-MWW催化H_2O_2分解

Hydrogen Peroxide Decomposition Catalyzed by Ti-MWW in a Fixed-Bed Reactor

在固定床反应器中,H2O2与Ti-MWW分子筛的接触时间越长,其分解率越高.结果表明,分子筛骨架Ti和其拥有的酸性位是造成H2O2在分子筛上分解的主要原因,非骨架Ti对H2O2分解的影响弱于骨架Ti.H2O2的无效分解直接影响反应物的转化效率.了解H2O2无效分解的原因,有利于设计出高活性钛硅分子筛.同时在固定床中研究钛硅分子筛催化分解H2O2的反应有可能成为一种评价钛硅分子筛催化活性的新方法.

H2O2 can be decomposed severely at low HaO2 weight hourly space velocity （WHSV） in the system of H2O2/Ti-MWW in a fixed-bed reactor. It was found that the tetrahedrally coordinated Ti in the titanosilicate molecular sieve was the main reason to arise H2O2 decomposition as well as the effect of acid centers of the catalyst. The octahedral Ti and anatase in the catalyst had a weaker influence on the decomposition of H2O2 than the tetrahedrally coordinated Ti. These results could give a guide to design highly effective titanosilicate molecular sieves eliminating the factors that caused the invalid decomposition of H2O2. H2O2 was the oxygen donor in the reaction. These results also improved the conversion of substrate. The study of H2O2 decomposition in a fixed-bed reactor provided a new way to examine the catalytic activity of titanosilicate molecular sieves.