Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
One-pot synthesis and characterization of colloidally robust rhodium(0) nanoparticles catalyst: exceptional activity in the dehydrogenation of ammonia borane for chemical hydrogen storage
Download
index.pdf
Date
2011
Author
Ayvalı, Tuğçe
Metadata
Show full item record
Item Usage Stats
190
views
103
downloads
Cite This
The production of transition metal(0) nanoparticles with controllable size and size distribution are of great importance in catalysis since their catalytic activity decreases as nanoparticles aggregate into clumps and ultimately to the bulk metal. Reducing the particle size of heterogeneous catalyst provides a significant rise in its activity as the fraction of surface atoms increases with decreasing particle size. Therefore, transition metal(0) nanoparticles need to be stabilized to certain extend in their catalytic applications by strong stabilizers. In this regard, tert-butylammonium octanoate [(CH3)3CNH3+][CH3(CH2)6COO-] seems to be an appropriate stabilizer for rhodium(0) nanoparticles since octanoate anion and its associated tert-butylammonium cation can provide a sufficient protection for rhodium(0) nanoparticles against aggregation by the combined electrostatic and steric effects. We report herein the preparation and characterization of rhodium(0) nanoparticles stabilized by tert-butylammonium octanoate and their catalytic use in the dehydrogenation of ammonia borane, H3NBH3, which appears to be the most promising hydrogen storage material due to its high hydrogen content (19.6 wt %). Rhodium(0) nanoparticles stabilized by tert-butylammonium octanoate were reproducibly prepared by the reduction of rhodium(II) octanoate dimer with tert-butylamine borane in toluene at room temperature and characterized by EA, XRD, ICP/OES, TEM, HRTEM, STEM, FTIR, XPS, UV-VIS and NMR spectroscopy. The new rhodium(0) nanoparticles is the first example of well-defined, reproducible, and isolable true heterogeneous catalyst used in the dehydrogenation of ammonia borane. They show record catalytic activity in the dehydrogenation of ammonia borane at room temperature with an apparent initial TOF value of 342 h-1 and TTO value of 1100.
Subject Keywords
Catalysts.
,
Chemistry.
URI
http://etd.lib.metu.edu.tr/upload/12613375/index.pdf
https://hdl.handle.net/11511/20587
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Synthesis and characterization of sta incorporated mesoporous materials as catalysts for polyethylene pyrolysis
Kelebek, Neriman; Sezgi, Naime Aslı; Department of Chemical Engineering (2016)
Pyrolysis of polymers, which is a process for recovery of the waste polymer, has attracted great attention in recent years due to the high amount of plastic waste present in nature.However, degradation rocess requires high amount of external energy to break long chain of chemical bonds in the polymer. For this reason, suitable catalysts with strong acid sites are necessary. High surface area silica structured mesoporous materials with narrow pore size distributions are excellent catalysts for these reaction...
One-pot synthesis of colloidally robust rhodium(0) nanoparticles and their catalytic activity in the dehydrogenation of ammonia-borane for chemical hydrogen storage
Ayvali, Tugce; Zahmakiran, Mehmet; Özkar, Saim (Royal Society of Chemistry (RSC), 2011-01-01)
Rhodium(0) nanoparticles stabilized by tert-butylammonium octanoate were prepared reproducibly from the reduction of rhodium(II) octanoate with tert-butylamine-borane in toluene at room temperature and characterized by ICP-OES, TEM, HRTEM, STEM, EDX, XRD, XPS, FTIR, UV-vis, B-11, C-13 and H-1 NMR spectroscopy and elemental analysis. These new rhodium(0) nanoparticles show unprecedented catalytic activity, lifetime and reusability as a heterogeneous catalyst in room temperature dehydrogenation of ammonia-bor...
One-step synthesis of hierarchical [B]-ZSM-5 using cetyltrimethylammonium bromide as mesoporogen
Yalcin, Busra Karakaya; İpek Torun, Bahar (The Scientific and Technological Research Council of Turkey, 2020-01-01)
One-step facile synthesis of boron containing ZSM-5 microspheres is developed using 1,6-diaminohexane as the structure-directing agent and cetyltrimethylammonium bromide as the mesoporogen. High boron incorporation up to Si/B ratio of 38 is achieved and evidenced by the stretching vibrations of B-O-Si at 667 cm(-1) and 917 cm(-1) using Fourier-transform infrared spectra. The morphology of the crystals resembles berry-like spheres with sizes approximately 15 mu m, which is composed of aggregated nanocrystals...
One-step synthesis of N-doped metal/biochar composite using NH3-ambiance pyrolysis for efficient degradation and mineralization of Methylene Blue
Mian, Md Manik; Liu, Guijian; Yousaf, Balal; Fu, Biao; Ahmed, Rafay; Abbas, Qumber; Munir, Mehr Ahmed Mujtaba; Liu Ruijia, Liu Ruijia (2019-04-01)
A series of new biochar-supported composite based on the combination of biochar and metallic nanoparticles (NPs) were produced through single-step pyrolysis of FeCl3-Ti(OBu)(4) laden agar biomass under NH3 environment. The physiochemical properties of composites were characterized thoroughly. It has found that heating temperature and N-doping through NH3-ambiance pyrolysis significantly influence the visible-light sensitivity and bandgap energy of composites. The catalytic activities of composites were meas...
Poly(4-styrenesulfonic acid-co-maleic acid) stabilized nickel(0) nanoparticles : highly active and cost effective catalyst in hydrogen generation from the hydrolysis of hydrazine borane
Şencanlı, Selin; Özkar, Saim; Department of Chemistry (2013)
In general, the catalytic activity of transition metal nanoparticles increases as the fraction of atoms on the surface increases with decreasing particle size. However, transition metal nanoparticles tend to agglomerate into bulk metal in solution. In order to prevent agglomeration stabilizing agent can be used in the formation of stable transition metal nanoparticles in solution. In this study, one of the most available commercial polymers was used to provide steric stabilization during the formation of st...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
T. Ayvalı, “One-pot synthesis and characterization of colloidally robust rhodium(0) nanoparticles catalyst: exceptional activity in the dehydrogenation of ammonia borane for chemical hydrogen storage,” M.S. - Master of Science, Middle East Technical University, 2011.
