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Effect of synthesis time on morphology of CeO2 nanoparticles and Au/CeO2 and their activity in oxidative steam reforming of methanol

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Journal of Rare Earths 2019年第8期37卷 819-828,I0002页

作者： Srisin Eaimsumang sujitra wongkasemjit Sangobtip Pongstabodee Siwaporn Meejoo Smith Sukritthira Ratanawilai Nuwong Chollacoop Apanee Luengnaruemitchai The Petroleum and Petrochemical College Chulalongkorn UniversityPathumwanBangkok 10330Thailand Department of Chemical Technology Faculty of ScienceChulalongkorn UniversityPathumwanBangkok 10330Thailand Center of Sustainable Energy and Green Materials and Department of Chemistry Faculty of ScienceMahidol University999 Phuttamonthon Sai 4 RoadSalayaNakomPathom 73170Thailand Department of Chemical Engineering Faculty of EngineeringPrince of Songkla UniversitySongkla 90112Thailand Renewable Energy Laboratory National Metal and Materials Technology Center(MTEC)114 Thailand Science ParkPaholyothin Rd.Klong 1KlongLuangPathumthani 12120Thailand Center of Excellence in Catalysis for Bioenergy and Renewable Chemicals(CBRC).Chulalongkorn University Bangkok 10330Thailand

Ceria(CeO2)supports,synthesized by hydrothermal treatment with different synthesis time(CeO2-X h,where X is the synthesis time in h)in the presence of the surfactant cetyltrimethyl ammonium bromide,were used as supports for gold(Au)*** synthesis time significantly affects the morphological structure and crystallite size of CeO2,where CeO2-2 h has the smallest crystallite size with coexisting nanorods and *** electron microscopy analysis confirms the morphology of CeO2 with distinctive(110),(100)and(111)planes,in agreement with interplanar spacings of 0.19,0,27 and 0.31,***,the morphology of CeO2-8 h and CeO2-48 h is mainly a truncated octahedral with crystal planes(111)and(100)accompanied by an interplanar spacing of 0.31 and0.27 nm,*** CeO2-X h supports and those with a 3 wt%Au loading(Au/CeO2-X h)were investigated in the oxidative steam reforming of methanol at temperatures between 200 and 400℃.The Au/CeO2-2 h gave the highest methanol conversion level and hydrogen yield at a low temperature of 250℃.This superior catalytic performance results from the good interaction between the metal and support and the well-distributed Au species on the CeO2 support.

关键词： Oxidative steam reforming Methanol Ceria nanoparticles Gold Synthesis time Rare earths

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Facile preparation of polybenzoxazine-based carbon microspheres with nitrogen functionalities:effects of mixed solvents on pore structure and supercapacitive performance

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Frontiers of Chemical Science and Engineering 2020年第6期14卷 1072-1086页

作者： Uthen Thubsuang Suphawadee Chotirut Apisit Thongnok Archw Promraksa Mudtorlep Nisoa Nicharat Manmuanpom sujitra wongkasemjit Thanyalak Chaisuwan School of Engineering and Technology Walailak UniversityNakhon Si Thammarat 80160Thailand School of Science Walailak UniversityNakhon Si TTiammarat 80160Thailand The Petroleum and Petrochemical College Chulalongkom UniversityBangkok 10330Thailand Center of Excellence on Petrochemical and Materials Technology Bangkok 10330Thailand

In this study,polybenzoxazine(PBZ)-based carbon microspheres were prepared via a facile method using a mixture of formaldehyde(F)and dimethylformamide(DMF)as the *** PBZ microspheres were successfully obtained at the F/DMF weight ratios of 0.4 and *** microspheres exhibited high nitrogen contents after *** microstructures of all the samples showed an amorphous phase and a partial graphitic *** porous carbon with the F/DMF ratio of 0.4 showed significantly higher specific capacitance(275.1 F·g^-1)than the reference carbon(198.9 F·g^-1)at 0.05 A-g This can be attributed to the synergistic electrical double-layer capacitor and pseudo-capacitor behaviors of the porous carbon with the F/DMF ratio of *** presence of nitrogen/oxygen functionalities induced pseudo-capacitance in the microspheres,and hence increased their total specific *** activation with CO2,the specific surface area of the carbon microspheres with the F/DMF ratio of 0.4 increased from 349 to 859 m^2•g^-1 and the specific capacitance increased to 424.7 F·g^-1 This value is approximately two times higher than that of the reference *** results indicated that the F/DMF ratio of 0.4 was suitable for preparing carbon microspheres with good supercapacitive *** nitrogen/oxygen functionalities and high specific surface area of the microspheres were responsible for their high capacitance.

关键词： PBZ carbon porous materials microsphere supercapacitor

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