Role of macroporosity in macro-mesoporous red mud catalysts for slurry-phase hydrocracking of vacuum residue
Role of macroporosity in macro-mesoporous red mud catalysts for slurry-phase hydrocracking of vacuum residue
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DOI：
10.1016/j.apcata.2013.08.031
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发表时间：
2013-11
影响因子：
5.5
通讯作者：
Chinh Nguyen-Huy;V. Pham;Do Kyoung Kim;Do-Woan Kim;Seung-Hoon Oh;J. Chung;Woo-Jae Kim;E. Shin-
中科院分区：
文献类型：
--
作者：
Chinh Nguyen-Huy;V. Pham;Do Kyoung Kim;Do-Woan Kim;Seung-Hoon Oh;J. Chung;Woo-Jae Kim;E. Shin-
为了提高赤泥对减压渣油油相加氢裂化的催化性能，以聚苯乙烯和Pluronic F-127为共模板剂，将宏观介孔引入赤泥中。用氮气吸附、X-射线衍射仪、氨程序升温脱附、扫描电子显微镜和过渡电子显微镜对所制得的大介孔赤泥催化剂进行了表征。随后，将其用于减压渣油在490℃下的悬浮相加氢裂化反应2小时。对比反应试验表明，与无大孔的活性RM相比，MA-RM对VR加氢裂化表现出更好的催化性能。在产品分布方面，MA-RM成功地抑制了结焦，提高了液体产率。MA-RM的大孔结构是通过含有加氢活性中心的介孔连接起来的。大-介孔结构的存在增强了催化剂上的加氢反应，这是因为催化剂更容易接近加氢的活性中心，从而导致更少的焦炭和更多的液体产率。
To improve the catalytic performance of red mud (RM) for slurry-phase hydrocracking of vacuum residue, macro-mesoporosity was introduced into RM using polystyrene and Pluronic F-127 as co-templates in this study. The obtained macro-mesoporous red mud (Ma-RM) catalysts were characterized by nitrogen adsorption, X-ray diffraction, ammonia temperature-programmed desorption, scanning electron microscopy, and transition electron microscopy. Subsequently, they were applied to the slurry-phase hydrocracking of vacuum residue at 490 °C for 2 h. Comparative reaction tests revealed that Ma-RM exhibited better catalytic behavior for the VR hydrocracking compared to activated RM without macropores. Ma-RM successfully suppressed coke formation and increased liquid yield in products distribution. The macroporous structure of Ma-RM was connected by mesopores containing active sites for hydrogenation. The presence of a macro-mesoporous structure enhanced hydrogenation over the catalysts due to better accessibility to the active sites for hydrogenation, which induced less coke and more liquid yield.