The technique of catalytic flow microreactor has been combined with the gas flow-through microcalorimetry to correlate the catalytic activity of supported heteropolyacids with both the acid strength of protons as well as the protons’ accessibility. Multiwall carbon nanotubes (CNT) were used as a support for Keggin (H₃PW₁₂O₄₀) and Wells-Dawson (H₆P₂W₁₈O₆₂) structured heteropolyacids, in order to produce catalysts combining high acidity from the parent acids with the inherent microporosity of the support. Prior to the catalytic tests, the obtained materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) and Raman spectroscopies as well as by the nitrogen adsorption-desorption analysis (BET). The latter technique confirmed overall improved porosity of the obtained materials. Upon testing for activity in the isopropyl alcohol dehydration, the supported Wells-Dawson catalysts turned out to be superior to both the Keggin-based materials, as well as to the unsupported H₆P₂W₁₈O₆₂. It has been found that the improvement of catalytic performance in the isopropanol conversion is mostly related to the increase of the accessibility of protons, rather than to the changes in the acid strengths.

催化流动微反应器技术已与气流通过微量量热法相结合，以使负载的杂多酸的催化活性与质子的酸强度以及质子的可及性相关联。多壁碳纳米管（CNT）用作Keggin（H ₃ PW ₁₂ O ₄₀）和Wells-Dawson（H ₆ P ₂ W ₁₈ O ₆₂）的载体）结构的杂多酸，以生产结合了母体酸的高酸性和载体固有的微孔性的催化剂。在催化测试之前，通过X射线衍射（XRD），扫描电子显微镜（SEM），傅立叶变换红外（FTIR）和拉曼光谱学以及通过氮吸附-脱附分析（BET）对获得的材料进行表征。后一种技术证实了所获得材料的总体孔隙率得到改善。通过测试异丙醇脱水的活性，发现负载的Wells-Dawson催化剂优于基于Keggin的材料以及不负载的H ₆ P ₂ W ₁₈ O ₆₂。已经发现，在异丙醇转化中催化性能的改善主要与质子可及性的增加有关，而不是与酸强度的变化有关。