In the present study, mono and bi-metallic catalysts containing Cr and Co were prepared by impregnating the hydrothermally prepared mesoporous KIT-6 support with 5–10 wt% total metal content. The well-ordered three-dimensional mesoporous structure of the KIT-6 support was confirmed by small angle X-ray diffraction (XRD) patterns. N 2 adsorption-desorption analysis results showed that the mesoporous structure of KIT-6 was preserved after metal loading. Structural bonds of KIT-6 support and prepared catalysts were determined by Fourier-transform infrared (FT-IR) spectroscopy. The pyridine adsorbed diffuse reflectance FT-IR (DRIFT) spectroscopy results revealed the presence of Lewis acid sites on the surface of the catalysts. Activity experiments were carried out in a microwave-heated continuous-flow fixed bed reactor system at temperature range of 350–650 °C and feed ratios of Ethane/Argon: 1/2, 1/1, 2/1 with a gas hourly space velocity (GHSV) of 18,000 ml/h.g cat . The 5Cr@KIT-6 catalyst exhibited high ethane conversion (63.5%) while the highest ethylene/hydrogen ratio (0.98) was obtained with the 2.5Cr2.5Co@KIT-6 catalyst at 450 °C. It was concluded that high temperatures (above 450 °C) facilitate the formation of side reactions and the production of aromatic compounds. The high catalytic activities of mesoporous catalysts were thought to be due to hot spots in the microwave reactor system.

中文翻译：

---

介孔的KIT-6负载的Cr和Co基催化剂用于微波辅助的非氧化乙烷脱氢

在本研究中，通过将水热法制备的介孔KIT-6载体浸渍在总金属含量为5-10 wt％的条件下，制备了含Cr和Co的单金属和双金属催化剂。通过小角度X射线衍射（XRD）图案确认了KIT-6载体的井然有序的三维介孔结构。N 2吸附-解吸分析结果表明，金属负载后KIT-6的介孔结构得以保留。KIT-6载体和制备的催化剂的结构键通过傅立叶变换红外（FT-IR）光谱确定。吡啶吸附的漫反射FT-IR（DRIFT）光谱结果表明，催化剂表面存在路易斯酸位。活性实验是在微波加热的连续流固定床反应器系统中进行的，温度范围为350–650°C，乙烷/氩气的进料比为：1 / 2、1 / 1、2 / 1，气体时空猫的最高速度（GHSV）为18,000 ml / hg。5Cr @ KIT-6催化剂显示出较高的乙烷转化率（63.5％），而2.5Cr2.5Co@KIT-6催化剂在450°C时可获得最高的乙烯/氢比（0.98）。结论是高温（高于450°C）促进了副反应的形成和芳族化合物的产生。介孔催化剂的高催化活性被认为是由于微波反应器系统中的热点。5％），而2.5Cr2.5Co@KIT-6催化剂在450°C时可获得最高的乙烯/氢比（0.98）。结论是高温（高于450°C）促进了副反应的形成和芳族化合物的产生。介孔催化剂的高催化活性被认为是由于微波反应器系统中的热点。5％），而2.5Cr2.5Co@KIT-6催化剂在450°C时可获得最高的乙烯/氢比（0.98）。结论是高温（高于450°C）促进了副反应的形成和芳族化合物的产生。介孔催化剂的高催化活性被认为是由于微波反应器系统中的热点。