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Mohammad Naseem Akhtar, Speaker at Chemistry Conferences
King Fahd University of Petroleum & Minerals, Saudi Arabia
Title : Catalytic performance of galloaluminosilicates in aromatization of lower alkanes: A comparative study with Ga/HZSM-5


A series of gallium-containing HZSM-5 zeolites with different Ga contents (Ga/(Al+Ga) = 0.1–0.6) were prepared by hydrothermal in situ synthesis and post synthesis. Their catalytic performance were compared in the aromatization of propane, butane and propane/butane mixture (1:1 molar). Galloaluminosilicate obtained via hydrothermal in situ synthesis exhibited high fraction of acidic framework Ga3+ with few dispersed extracrystalline Ga2O3. Ga/HZSM-5 obtained by post synthesis showed the presence of extracrystalline Ga2O3 and/or extra framework gallyl ions. The aromatization performance of Ga-containing HZSM-5 followed the following sequence; galloaluminosilicate > Ga/HZSM-5 (ion-exchange) > Ga/HZSM-5 (impregnation) >> HZSM-5. Optimum aromatization performance over galloaluminosilicate was achieved with Ga/(Al+Ga) ratio of 0.3. Propane conversion reached 50.9 wt% over galloaluminosilicate with Ga/(Al+Ga) of 0.3, as compared to 31.8 and 40.7 wt% for the corresponding Ga/HZSM-5 obtained by impregnation and ion exchange, respectively, at gas hourly space velocity of 1,600 h-1, and 540 ?C. Comparison of aromatic selectivity at the same conversion level (~10.0 wt%) revealed that galloaluminosilicate is more selective than Ga/HZSM-5. The superior performance of galloaluminosilicate was attributed to the presence of highly dispersed-reducible extra-framework Ga2O3 (Lewis-dehydrogenating sites) formed by degalliation in close proximity to zeolitic Bronsted sites. Thus, hydrothermal in situ approach can thus be considered as an effective method for improving the aromatization performance of HZSM-5.


Dr. Muhammad Naseem Akhtar is a Research Scientist-I/Associate Professor at the Center for Refining and Petrochemicals of the Research Institute, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran, Saudi Arabia. He received his Ph.D. degree in Chemistry in 1996 from KFUPM, Dhahran, Saudi Arabia, and his M.Phil. and M.Sc. degrees in Chemistry from Quaid-E-Azam University, Islamabad, Pakistan in 1990 and 1987, respectively.  He is a member of American Chemical Society, Saudi Arabian International Chemical Sciences Chapter of the American Chemical Society, and Saudi Arabian Section of American Institute of Chemical Engineers.
Dr. Akhtar has been active in research for almost two decades. His contributions in the field of petrochemicals are of great significance which addresses the developing technologies for polyolefin catalysis and conversion of low-value petroleum derived feedstocks into high-value petrochemicals products.
Dr. Akhtar has been actively involved in several projects related to the petrochemicals for local and international clients. 
Dr. Akhtar has published several patents and international refereed journal papers in reputable journals and has participated in national/international conference in the area of petrochemicals, catalysis, and polyolefin. His research work has been widely cited in scientific literature and technical reports.