화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.98, 189-199, June, 2021
DOI10.1016/j.jiec.2021.04.003  Export Citation
Hierarchical composite catalysts of MCM-41 on zeolite Beta for conversion of heavy reformate to xylenes
Syed A. Ali†, Faisal M. Almulla1, B. Rabindran Jermy2, Abdullah M. Aitani, Raed H. Abudawoud1, Mohammed AlAmer1, Ziyauddin S. Qureshi, Thamer Mohammad1, and Hassan S. Alasiri
  • Center for Refining and Petrochemicals, The Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
  • 1Research and Development Center, Saudi Aramco, Dhahran, 31311, Saudi Arabia
  • 2Department of Nanomedicine Research, Institute for Research and Medical Consultations, Imam Abdulrahman Bin Faisal University, Dammam 31441, Saudi Arabia
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Hierarchical composites of MCM-41 on zeolite Beta were synthesized by in-situ hydrothermal technique, characterized and their catalytic performance for converting heavy reformate into valuable xylenes was evaluated. Systematic optimization of the hierarchical pore generation was carried out by varying the strength of the alkaline solution (0.10-0.45 M NaOH) during disintegration of zeolite Beta. The nanocomposites obtained were extruded with alumina binder and impregnated with 4.0 wt% Mo. The characterization results indicate the transition of mesophase occurs from distinct disordered phase to ordered/disordered and then to ordered mesophase with increasing alkaline concentration. The xylene yield over the hierarchical composite zeolite was 1.4 times more than the parent zeolite Beta. Incorporation of a well-dispersed mild hydrogenation function (4 wt.% Mo) was advantageous in improving the xylene yield and selectivity. The formulation prepared with moderately alkaline (0.2 M NaOH) solution exhibited optimum bimodal pore structure and improved dealkylation and transalkylation conversion resulting in a xylene yield of 33.0 wt.% and 1.7 times enhancement in xylene selectivity over parent zeolite Beta. A 30 h stability test showed steady performance and xylene yields. Hence, a potential application of hierarchical zeolite Beta and MCM-41 composite catalysts for the conversion of heavy aromatics to produce xylenes has been successfully demonstrated.
Keywords:Hierarchical;Composite zeolite Beta;MCM-41;Dealkylation;Transalkylation;Xylenes
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