El-Aal Mohamed Abd, Said Abd El-Aziz Ahmed, Abdallah Mohamed H, Goda Mohamed Nady
Catalysis and Surface Chemistry Lab, Chemistry Department, Faculty of Science, Assiut University, Assiut, 71516, Egypt.
Chemistry Department, Faculty of Science, Al-Azhar University, Assiut, 71524, Egypt.
Sci Rep. 2022 Jun 7;12(1):9407. doi: 10.1038/s41598-022-13349-0.
In this work, the production of dimethyl ether (DME) from methanol over natural kaolin clay modified through impregnation with various percentages of HSO, WO, or ZrO catalysts was investigated. The prepared catalysts were characterized via X-ray fluorescence, X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and N-sorption analysis. The acidity of these catalysts was determined through the dehydration of isopropyl alcohol and the chemisorption of pyridine. The catalytic activity performance revealed that the addition of modifiers into kaolin enhanced the latter's activity toward DME production. In addition, the kaolin clay modified with 10 wt% ZrO exhibited excellent activity of 98% conversion with 100% selectivity at 275 °C. Moreover, this catalyst could proceed the reaction for a long time (6 days) without any noticeable deactivation. The remarkable improvement in the catalytic performance achievement was well correlated with the acidity and the structure of the catalysts.
在这项工作中，研究了通过用不同百分比的HSO、WO或ZrO催化剂浸渍改性的天然高岭土粘土由甲醇生产二甲醚（DME）的情况。通过X射线荧光、X射线衍射、傅里叶变换红外光谱、扫描电子显微镜和N吸附分析对制备的催化剂进行了表征。通过异丙醇脱水和吡啶化学吸附测定了这些催化剂的酸度。催化活性性能表明，向高岭土中添加改性剂提高了其对DME生产的活性。此外，用10 wt% ZrO改性的高岭土粘土在275°C下表现出优异的活性，转化率为98%，选择性为100%。此外，该催化剂可以长时间（6天）进行反应而没有任何明显的失活。催化性能的显著提高与催化剂的酸度和结构密切相关。
