A series of APTMS ((3-aminopropyl)trimethoxysilane)-modified silicate MCM-41 adsorbents (x-APTMS/MCM-41, x is the volume of APTMS per 1 g of silicate MCM-41) with different APTMS contents was prepared, and the effects of APTMS content on the desulfurization performance of the APTMS/MCM-41 adsorbents were studied in a fixed adsorption bed using H2S and N2 mixture as a model gas. The as-prepared adsorbents were characterized by X-ray diffraction analysis, N2 adsorption–desorption, Fourier transform infrared spectroscopy, transmission electron microscopy, scanning electron microscopy, and energy-dispersive spectroscopy. The results showed that all the APTMS-modified x-APTMS/MCM-41 adsorbents retained the mesoporous silica structure of MCM-41. The Brunauer–Emmett–Teller-specific surface area of x-APTMS/MCM-41 increased slightly with increasing x at first and then decreased with further increasing APTMS content. The H2S removal performances of x-APTMS/MCM-41 adsorbents decreased in the order 0.6-APTMS/MCM-41 > 0.7-APTMS/MCM-41 > 0.5-APTMS/MCM-41 > 0.4-APTMS/MCM-41 > 0.8-APTMS/MCM-41. At x = 0.6, the maximum H2S removal rate of 54.2% and H2S saturated capacity of 134.4 mg g−1 were observed. The regeneration experiment of 0.6-APTMS/MCM-41 adsorbent after three times regeneration at 423 K for 3 h in nitrogen confirmed that it possessed a good regenerability.

中文翻译：

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胺改性硅酸盐MCM-41吸附剂的制备及其脱硫性能研究

制备了一系列不同APTMS含量的APTMS（（3-氨基丙基）三甲氧基硅烷）改性硅酸盐MCM-41吸附剂（x-APTMS/MCM-41，x为每1g硅酸盐MCM-41中APTMS的体积），并在固定吸附床中使用 H2S 和 N2 混合物作为模型气体研究了 APTMS 含量对 APTMS/MCM-41 吸附剂脱硫性能的影响。所制备的吸附剂通过 X 射线衍射分析、N2 吸附-解吸、傅里叶变换红外光谱、透射电子显微镜、扫描电子显微镜和能量色散光谱进行表征。结果表明，所有APTMS改性的x-APTMS/MCM-41吸附剂都保留了MCM-41的介孔二氧化硅结构。x-APTMS/MCM-41 的 Brunauer-Emmett-Teller 比表面积先随着 x 的增加略有增加，然后随着 APTMS 含量的进一步增加而减少。x-APTMS/MCM-41 吸附剂的 H2S 去除性能以 0.6-APTMS/MCM-41 > 0.7-APTMS/MCM-41 > 0.5-APTMS/MCM-41 > 0.4-APTMS/MCM-41 > 0.8 的顺序下降-APTMS/MCM-41。在 x = 0.6 时，观察到最大 H2S 去除率为 54.2%，H2S 饱和容量为 134.4 mg g-1。0.6-APTMS/MCM-41吸附剂在氮气中423 K、3 h再生3次后的再生实验证实其具有良好的再生性。4-APTMS/MCM-41 > 0.8-APTMS/MCM-41。在 x = 0.6 时，观察到最大 H2S 去除率为 54.2%，H2S 饱和容量为 134.4 mg g-1。0.6-APTMS/MCM-41吸附剂在氮气中423 K、3 h再生3次后的再生实验证实其具有良好的再生性。4-APTMS/MCM-41 > 0.8-APTMS/MCM-41。在 x = 0.6 时，观察到最大 H2S 去除率为 54.2%，H2S 饱和容量为 134.4 mg g-1。0.6-APTMS/MCM-41吸附剂在氮气中423 K、3 h再生3次后的再生实验证实其具有良好的再生性。