Influence of swelling agents on pore size distributions of porous silica-alumina hollow sphere particles in acid-promoted hydrolytic generation of hydrogen from ammonia borane |
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| Affiliation: | 1. Consejo Nacional de Investigaciones Científicas y Técnicas, CONICET-Centro Atómico Bariloche (CNEA), R8402AGP, S. C. de Bariloche, Río Negro, Argentina;2. IREC Catalonia Institute for Energy Research, 08930, Sant Adrià de Besòs, Barcelona, Spain;3. Universidad Nacional de Cuyo (Instituto Balseiro)-Centro Atómico Bariloche (CNEA), R8402AGP, S. C. de Bariloche, Río Negro, Argentina;1. Laboratory of Inorganic Materials, Department of Chemistry, Faculty of Science and Arts, Çanakkale Onsekiz Mart University, Çanakkale, Turkey;2. Department of Chemistry and Chemical Processing Technologies, Lapseki Vocational School, Çanakkale Onsekiz Mart University, Çanakkale/Lapseki, Turkey;3. Department of Bioengineering, Faculty of Engineering, Çanakkale Onsekiz Mart University, Çanakkale, Turkey;1. Chuiko Institute of Surface Chemistry, National Academy of Sciences of Ukraine, 17, Generala Naumova str., Kyiv 03164, Ukraine,;2. Institute of Catalysis, Bulgarian Academy of Sciences, 11, Acad. G. Bonchev str., Sofia 1113, Bulgaria,;3. Technical University of Kosice, 9, Letna str., Kosice 04200, Slovak Republic,;4. Maria Curie-Sklodowska University, 3, Maria Curie-Skłodowska sq., Lublin 20-031, Poland,;5. Institute of Geotechnics, Slovak Academy of Sciences, 45, Watsonova str., Kosice 04001, Slovak Republic |
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| Abstract: | We studied the influence of swelling agents on pore size distributions in the shell of porous silica-alumina hollow sphere particles for acid-promoted hydrolytic generation of hydrogen from ammonia borane. Their well-ordered porous shells were formed with micelle templates of cetyltrimethylammonium bromide on spherical polystyrene (PS) particle templates, and swelling agents were introduced into the micelle templates for expanding the pores. Non-polar agents (hexane and toluene) did not significantly influence the size of the pores, whereas, polar agents (1-dodecanol and 1-dodecylamine) effectively expanded the pores. The hollow sphere particles formed with 1-dodecylamine possessed narrow pore distribution with a high peak pore volume. The activity of the hollow sphere particles in the hydrolytic generation of hydrogen increased according to increasing pore size with a narrow distribution, and the hollow sphere particles formed with 1-dodecylamine showed an approximately five times higher TOF for the hydrogen evolution than those formed without a swelling agent. |
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| Keywords: | Porous silica-alumina hollow sphere particles Micelle Swelling agent Well-ordered mesopores |
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