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Spillover enhanced hydrogen uptake of Pt/Pd doped corncob-derived activated carbon with ultra-high surface area at high pressure
- Source :
- International Journal of Hydrogen Energy. 39:13643-13649
- Publication Year :
- 2014
- Publisher :
- Elsevier BV, 2014.
-
Abstract
- Corncob-derived activated carbon (CAC) was prepared by potassium hydroxide activation. The Pt/Pd-doped CAC samples were prepared by two-step reduction method (ethylene glycol reduction plus hydrogen reduction). The as-obtained samples were characterized by N 2 -sorption, TEM and XRD. The results show the texture of CAC is varied after doping Pt/Pd. The Pd particles are easier to grow up than Pt particles on the surface of activated carbon. For containing Pt samples, the pore size distributions are different from original sample and Pd loaded sample. The hydrogen uptake results show excess hydrogen uptake capacity on the Pt/Pd-doped CAC samples are higher than pure CAC at 298 K, which should be attributed to hydrogen spillover effects. The 2.5%Pt and 2.5%Pd hybrid doped CAC sample shows the highest hydrogen uptake capacity (1.65 wt%) at 298 K and 180 bar, The particle size and distribution of Pt/Pd catalysts could play a crucial role on hydrogen uptake by spillover. The total hydrogen storage capacity analysis show that total H 2 storage capacities for all samples are similar, and spillover enhanced H 2 uptakes of metal-doped samples could not well support total H 2 storage capacity. The total pore volume of porous materials also is a key factor to affect total hydrogen storage capacity.
- Subjects :
- Potassium hydroxide
Hydrogen
Renewable Energy, Sustainability and the Environment
Chemistry
Inorganic chemistry
Energy Engineering and Power Technology
chemistry.chemical_element
Condensed Matter Physics
Catalysis
Hydrogen storage
chemistry.chemical_compound
Fuel Technology
medicine
Particle size
Hydrogen spillover
Ethylene glycol
Activated carbon
medicine.drug
Subjects
Details
- ISSN :
- 03603199
- Volume :
- 39
- Database :
- OpenAIRE
- Journal :
- International Journal of Hydrogen Energy
- Accession number :
- edsair.doi...........343538c0ec1f6a3332828d888b2758c8