摘要
采用Hammett指示剂法、表面零电荷点ZPC（Zeropointofcharge）和CO2（NH3）TPD法对HZSM-5表面酸碱中心的强度和数量进行了表征，研究了HZSM-5对芥子气（HD）催化降解，并采用GC-MS、GC—FPD等手段检测了催化降解的产物。结果表明，HZSM-5的pKa值为-3．0～-5．6，为典型的固体酸性氧化物。在25℃空气（20％～30％RH）条件下，HZSM-5能降解HD液滴，反应的假-级速率常数为5．3×10^-6s^-1。HD液滴于HZSM-5表面的降解产物主要为2-chloroethyl2-hydroxyethylsulfide（cH）和1，4-dithiane，表明HD液滴在酸中心的作用下主要发生加成-消去反应。
The acid-base properties at the surface of HZSM-5 were characterized and the degradation reaction for Mustard （HD） droplet over HZSM-5 was investigated. It was experimentally demonstrated that H2SM-5 was a typical solid acid and was able to react with droplet of HD in 25℃, 20%-30%RH condition. The degradation rate constant k in first order is about 5. 3 × 10^-6 s^-1 for HD degradation over HZSM-5. CH and 1,4-dithiane were detected for HD degradation over HZSM-5, which were certainly formed from hydrolysis reaction and additionelimination reaction. It was the main reaction of addition-elimination reaction for HD degradation over surface of the solid on the role of acid sites.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2008年第B10期116-119,123,共5页
Acta Petrolei Sinica(Petroleum Processing Section)
