Vlasenko Nina V, Kosmambetova Gulnara R, Senchylo Eugenia V, Kúš Peter, Veltruská Kateřina, Strizhak Peter E
Department of Catalytic Synthesis Based on Single-Carbon Molecules, L.V. Pysarzhevskii Institute of Physical Chemistry National Academy of Sciences of Ukraine, Prospect Nauki, 31, 03039, Kyiv, Ukraine.
Department of Surface and Plasma Science, Charles University, V Holešovičkách 747/2, 180 00, Prague 8, Czech Republic.
ChemSusChem. 2025 Mar 3;18(5):e202401800. doi: 10.1002/cssc.202401800. Epub 2024 Nov 12.
The catalytic performance of phosphate-stabilized WO-ZrO compositions in gas-phase glycerol dehydration has been investigated. Results show that varying WO concentrations direct the process towards either acrolein or allyl alcohol formation. Catalysts with low WO content exhibit strong Lewis acid sites (Zr and W), where these metal ions likely function as redox sites, facilitating glycerol hydrogenolysis to produce allyl alcohol. Higher WO concentrations (exceeding 20 wt %) lead to the shielding of some W and Zr sites by polytungstate surface complexes, which are strong Brønsted acid sites. This alteration promotes glycerol dehydration through the removal of two water molecules, thereby shifting the selectivity towards acrolein formation.
研究了磷酸盐稳定的WO-ZrO组合物在气相甘油脱水反应中的催化性能。结果表明，改变WO的浓度可使反应过程朝着生成丙烯醛或烯丙醇的方向进行。低WO含量的催化剂表现出较强的Lewis酸位点（Zr和W），这些金属离子可能作为氧化还原位点，促进甘油氢解生成烯丙醇。较高的WO浓度（超过20 wt %）会导致多钨酸盐表面络合物屏蔽一些W和Zr位点，这些表面络合物是强Brønsted酸位点。这种变化通过去除两个水分子促进甘油脱水，从而使选择性转向丙烯醛的生成。
