中文摘要：

采用溶胶-凝胶组装方法制备了Nafion/SiO2胶体,并涂附于烧结的316L不锈钢（SS-316L）金属微纤网络,形成了空隙率为60%-75%（φ,体积分数）的整体式微纤结构化的Nafion/SiO2固体酸催化剂.使用傅里叶变换红外光谱（FT-IR）,热重分析（TGA）,扫描电子显微镜（SEM）及NH3吸附法对微纤结构化的Nafion/SiO2催化剂进行了表征.结果显示,溶胶-凝胶组装方法可以明显促进Nafion的分散,导致酸性中心的暴露量显著增加;结构化的Nafion/SiO2催化剂以200-400nm颗粒堆积而成的多孔涂层形式存在.在一种集换热、混合、催化（反应）功能于一体的微反应器中,考察了整体式微纤结构化的Nafion/SiO2固体酸催化剂催化苯硝化的反应性能.Nafion在SiO2中的组装量为20%（w,质量分数）,金属微纤网络上Nafion/SiO2担载量为36.3%（w）的优化催化剂上,75℃时苯转化率为44.7%,硝基苯选择性可达99.9%.相近转化率下,Nafion/SiO2固体酸单位酸中心的催化效能约为硫酸的600倍.

英文摘要：

We prepared novel monolithic microfiber-structured Nafion/SiO2 solid acid catalysts with 60%-75% （φ, volume fraction） void volume by coating Nafion/SiO2 sol-gel onto a sinter-locked stainless steel （SS-316L） microtibrous network. We characterized the microstructured Nafion/SiO2 catalysts using Fourier transform-infrared spectrometry （FT-IR）, thermogravimetric analysis （TGA）, scanning electron microscopy （SEM）, and NH3-chemisorption. Results show that the sol-gel technology results in highly dispersed Nation particles which significantly increase the number of accessible acid sites. The Nafion/SiO2 catalyst coating layer is made up of 200-400 nm particles and looks porous. The catalytic performance of the microstructured Nation/SiO2 catalysts was tested using the nitration of benzene in a continuous-flow microreactor that integrated heat-exchange, mixture, and catalytic reactions. The best catalyst had a loading capacity of 36.3% （w, mass fraction） for the Nafion/SiO2 composite in which the Nation content was 20% （w）. At a reaction temperature of 75 ℃, this optimized microstructured solid acid catalyst resulted in a benzene conversion of 44.7% with a nitrobenzene selectivity of 99.9%. At an equivalent conversion level, the activity per acid site of the microstructured Nafion/SiO2 catalyst is nearly 600 times as that of liquid sulfuric acid.