| 1 | Medicinal and biological values of Callistemon viminalis extracts:History,current situation and prospects显示文摘Callistemon viminalis(C.viminalis)is a plant that has been reported to have a various medicinal values such as antibacterial,antifungal,antioxidant activities and other pharmaceutical and insecticidal properties.This review covers the potentials,applications and properties of different extracts from different parts(branches,flowers,fruits,bark,leaves)of C.viminalis.Furthermore,the chemical structures of the bioactive compounds were reported for biological activities.All the results supported the traditional uses of C.viminalis in folk medicine.In addition,some researches supported the use of C.viminalis extracts for the preparation of metal oxide nanoparticles. | Mohamed Z.M.Salem Mervat EL-Hefny Ramadan A.Nasser Hayssam M.Ali Nader A.El-Shanhorey Hosam O.Elansary | 2017 | Asian Pacific Journal of Tropical Medicine2017，10，3： | 1 |
| 3 | CO_(2)utilization in syngas conversion to dimethyl ether and aromatics:Roles and challenges of zeolites-based catalysts显示文摘Several studies have proven a strong correlation between global warming and CO_(2)emissions.Annually,38 billion tons of CO_(2)are approximately emitted into the atmosphere.Utilizing CO_(2)via chemical conversion to clean fuels and value-added aromatics can substantially contribute to controlling the problem.Considering the thermodynamic and environmental limitations of hydrogenation of CO_(2)alone to value-added aromatics and fuels,CO_(2)utilization has currently emerged as a promising and practical approach for the production of fuels and aromatics with simultaneous utilization of both CO and CO_(2)wastes.As such,the approach is economically preferable.CO_(2)could be converted directly to fuels by the hydrogenation process or as a part of a syngas mixture.Dimethyl ether(DME)is a clean fuel with a higher energy density,which could be used as a substituent for several fuels such as diesel.In the same vein,value-added aromatics such as benzene,toluene,and xylene(BTX)can be produced from a similar process.Herein,we report a review that collects the most recent studies for the conversion of CO_(2)to DME and aromatics via zeolite-based bifunctional catalysts.We highlighted the main routes for producing DME and aromatics,as well as thoroughly discussed the conducted studies on CO_(2)hydrogenation and CO_(2)-rich syngas utilized as feedstock for conversion to DME and aromatics.The CO_(2)hydrogenation mostly occurs through the methanol-mediated reaction route but is most often limited by low selectivity and catalyst deactivation,particularly in the utilization of CO_(2)alone for the reduction reaction.The review takes an overview of the progress made so far and concluded by identifying the roles and challenges of zeolite-based catalysts for CO_(2)utilization and conversion to DME and aromatics.Accordingly,despite the incredible growth the field received in the last couple of years,however,many research challenges and opportunities associated with this process are still abounded and required to be addressed.Special attention is required for the development of approaches to block diffusion of H2O through zeolite to suppress the excess formation of CO_(2)in CO_(2)-rich syngas hydrogenation to DME and aromatics,exceed the product distribution limits,and suppress catalysts deactivation. | Ali A.Al-Qadri Galal A.Nasser Haruna Adamu Oki Muraza Tawfik A.Saleh | 2023 | Journal of Energy Chemistry2023，，4： | 0 |
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