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首页> 外文期刊>RSC Advances >Ultrasonic-assisted preparation of highly active Co3O4/MCM-41 adsorbent and its desulfurization performance for low H2S concentration gas
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Ultrasonic-assisted preparation of highly active Co3O4/MCM-41 adsorbent and its desulfurization performance for low H2S concentration gas

机译：超声波辅助制备高活性CO3O4 / MCM-41吸附剂及其低温H2S浓度气体的脱硫性能

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Co _(3) O _(4) /MCM-41 adsorbents were successfully prepared by ultrasonic assisted impregnation (UAI) and traditional mechanical stirring impregnation (TMI) technologies and characterized by X-ray diffraction (XRD), N _(2) adsorption desorption, Fourier transform infrared spectra (FT-IR), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and thermogravimetry-differential thermal analysis (TG-DTA). The H _(2) S removal performances for a simulated low H _(2) S concentration gas were investigated in a fixed-bed. The effect of preparation and adsorption conditions on the H _(2) S removal over Co _(3) O _(4) /MCM-41 were systematically examined. The results showed that UAI promotes more and well defined highly dispersed active Co _(3) O _(4) phase on MCM-41. As compared to the Co _(3) O _(4) /MCM-41-T prepared via TMI, the saturated H _(2) S capacity of Co _(3) O _(4) /MCM-41-U prepared via UAI improved by 33.2%. The desulfurization performance of adsorbents decreased in the order of Co _(3) O _(4) /MCM-41-U > Co _(3) O _(4) /MCM-41-T > MCM-41. The Co _(3) O _(4) /MCM-41-U prepared using Co(NO _(3) ) _(2) concentration of 10%, ultrasonic time of 2 h, calcination temperature of 550 °C and calcination time of 3 h exhibited the best H _(2) S removal efficiency. At adsorption temperature of 25 °C with model gas flowrate of 20 mL min ~(?1) , the breakthrough time of Co _(3) O _(4) /MCM-41-U was 10 min, and the saturated H _(2) S capacity and H _(2) S removal rate was 52.6 mg g ~(?1) and 47.8%, respectively.
机译：通过超声辅助浸渍（UAI）和传统的机械搅拌浸渍（TMI）技术成功制备CO _（3）/ MCM-41吸附剂，并以X射线衍射（XRD），N _（2）为特征吸附解吸，傅里叶变换红外光谱（FT-IR），透射电子显微镜（TEM），扫描电子显微镜（SEM）和热重率 - 差分热分析（TG-DTA）。在固定床中研究了模拟低H _（2）S浓度气体的H _（2）的去除性能。系统地检查了在CO _（3）O _（4）/ MCM-41上的H _（2）S去除对H _（2）的去除物的影响。结果表明，UAI在MCM-41上促进了更多且良好地定义了高度分散的活性CO _（3）O _（4）相。与通过TMI制备的CO _（3）O _（4）/ MCM-41-T相比，CO _（3）O _（4）/ MCM-41-U的饱和H _（2）S容量通过UAI准备好33.2％。吸附剂的脱硫性能按CO _（3）O _（4）/ MCM-41-U> CO _（3）O _（4）/ MCM-41-T> MCM-41的顺序下降。使用CO（NO _（3））_（2）浓度为10％，超声时间2小时，煅烧温度为550°C和煅烧的浓度和煅烧3小时的时间表现出最佳的H _（2）次清除效率。在吸附温度为25°C的模型气体流量为20mL min〜（Δ1），Co _（3）O _（4）/ mcm-41-U的突破时间为10分钟，饱和H _ （2）S产能和H _（2）次去除率分别为52.6mg g〜（α1）和47.8％。

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