A series of vanadium substituted phosphomolybdic acid (VPMA) supported on mesoporous MCM-41 catalysts with varying VPMA content ranging from 10 to 50 wt% were prepared by impregnation method. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, Raman spectroscopy, scanning electron microscopy, N₂ adsorption–desorption measurements to determine surface area and pore size distribution. The acidity measurements were studied by temperature programmed desorption (TPD) of NH₃ and nature of acidic sites were examined by pyridine adsorbed FT-IR spectra. XRD results and N₂ adsorption–desorption isotherms revealed the retention of ordered mesoporous structure of MCM-41 and the uniform pore structure with increase in HPA loading. FT-IR and Raman spectra showed that the primary structure of the Keggin units of the VPMA remains intact with the MCM-41. The TPD-NH₃ showed that acidity of the catalysts increased with increase of VPMA loading. The findings of FT-IR spectra of pyridine adsorption revealed that VPMA/MCM-41 catalysts contain both the Brønsted and Lewis acidic sites and the amount of Brønsted acidic sites increased with increase of VPMA loading up to 40 wt% on the support. The catalysts were tested for the vapour phase dehydration of glycerol to acrolein. The catalyst samples were found to be highly active with 100% conversion and the acrolein selectivity changed with VPMA active phase loading on the support. In summary, the catalytic properties in terms of conversion and selectivity are attributed to the acidity, structural and textural properties of VPMA/MCM-41 catalyst.

通过浸渍法制备了一系列负载在介孔MCM-41催化剂上的钒取代的磷钼酸（VPMA），VPMA含量在10〜50 wt％之间变化。通过X射线衍射（XRD），傅里叶变换红外（FT-IR）光谱，拉曼光谱，扫描电子显微镜，N ₂吸附-解吸测量来确定样品的表面积和孔径分布。通过NH _3的程序升温脱附（TPD）研究酸度测量值，并通过吡啶吸附的FT-IR光谱检查酸性位点的性质。XRD结果和N ₂吸附-解吸等温线表明，随着HPA负荷的增加，MCM-41的有序介孔结构得以保留，孔结构均匀。FT-IR和拉曼光谱表明，VPMA的Keggin单元的一级结构与MCM-41保持完整。TPD-NH ₃结果表明，随着VPMA负载量的增加，催化剂的酸度也随之增加。吡啶吸附的FT-IR光谱结果表明，VPMA / MCM-41催化剂同时包含布朗斯台德和路易斯酸性位点，布朗斯台德酸性位点的数量随VPMA在载体上的负载增加而增加，最高可达40 wt％。测试了催化剂将甘油气相脱水成丙烯醛的能力。发现催化剂样品是高活性的，具有100％的转化率，并且丙烯醛的选择性随载体上负载的VPMA活性相而改变。总而言之，就转化率和选择性而言，催化性能归因于VPMA / MCM-41催化剂的酸度，结构和质构性质。