TY - JOUR
T1 - Adsorption of ethylamine on silica-supported nickel phosphide
AU - Oyama, S. Ted
AU - Wang, Xianqin
AU - Radhakrishnan, Rakesh
N1 - Funding Information:
The adsorptiono f ethylaminoen a freshlyr educedN i2P/SiO2s urfaceg ivesr ise to an amine complexth ati nteracttsh roughit 's nitrogenlo nep airwith a surfacen ickelc enterin a Lewis acid-base manner. The adsorptiono n an HES-treatesda mpleg ivesr ise to an ethylammoniusmpe ciesw, hich interactws ith the surfacein a Brensteda cid-basem anner.E xcellenta greemenist obtainedb etween calculateadn do bservedv ibrationaflr equenciefso r the adsorbedam ines pecies.T PD measurements indicateth att hee thylammoniusmpe ciesis morer eactiveth ant hea minein the ~-eliminatiorne action to form the HDN product.S upportf or this work was from the Departmenotf Energy( DOE) Office of Basic EnergyS cience,G rantD E-FG02-96ER1466a9n d the NEDO InternationaJol int Research Program.
PY - 2002
Y1 - 2002
N2 - The adsorption of ethylamine on Ni2P/SiO2 was studied by diffuse-reflectance Fourier transform infrared (FTIR) spectroscopy, temperature-programmed desorption (TPD), and ab initio calculations. The FTIR results indicate that ethylamine is adsorbed molecularly on the freshly reduced surface, but in the form of an ethylammonium species on the fresh surface exposed to H2S. The TPD results indicate that ethylamine is held strongly, and decomposes to release ammonia at 500 K and ethylene at 883 K. The ethylammonium species is more reactive and releases ammonia at 634 K and ethylene at 622 K. Molecular orbital calculations for the adsorbed ethylamine give good agreement between experimentally observed vibrational frequencies and calculated values. These results indicate that on the freshly reduced surface ethylamine interacts through its nitrogen lone pair with Ni sites in a Lewis acid-base manner.
AB - The adsorption of ethylamine on Ni2P/SiO2 was studied by diffuse-reflectance Fourier transform infrared (FTIR) spectroscopy, temperature-programmed desorption (TPD), and ab initio calculations. The FTIR results indicate that ethylamine is adsorbed molecularly on the freshly reduced surface, but in the form of an ethylammonium species on the fresh surface exposed to H2S. The TPD results indicate that ethylamine is held strongly, and decomposes to release ammonia at 500 K and ethylene at 883 K. The ethylammonium species is more reactive and releases ammonia at 634 K and ethylene at 622 K. Molecular orbital calculations for the adsorbed ethylamine give good agreement between experimentally observed vibrational frequencies and calculated values. These results indicate that on the freshly reduced surface ethylamine interacts through its nitrogen lone pair with Ni sites in a Lewis acid-base manner.
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M3 - Article
AN - SCOPUS:0042809539
SN - 0167-2991
VL - 145
SP - 347
EP - 350
JO - Studies in Surface Science and Catalysis
JF - Studies in Surface Science and Catalysis
ER -