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Microcalorimetric Study of Ammonia Chemisorption on H3PW12O40 Supported onto Mesoporous Synthetic Carbons and SBA-15


Reference:

Lapkin, A., Savill-Jowitt, C., Edler, K. and Brown, R., 2006. Microcalorimetric Study of Ammonia Chemisorption on H3PW12O40 Supported onto Mesoporous Synthetic Carbons and SBA-15. Langmuir, 22 (18), pp. 7664-7671.

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Abstract

Keggin tungstophosphoric acid supported onto mesoporous and meso-microporous materials was studied by ammonia microcalorimetry. Expts. were performed at high and low temps. to sep. the contributions of chemisorption and physisorption, low-temp. data being potentially important for the ambient temp. purifn. processes. Anal. of thermokinetic data obtained from heat output curves at an elevated temp. allows one to distinguish the transition between reaction of ammonia with the acid sites and the onset of phys. sorption. Thermokinetic data are also sensitive to the pore structure of the support materials, with faster sorption registered in the case of materials with the open mesoporous structure. The SBA-15 supported acid shows the max. ammonia uptake and the strongest acid sites among the three materials studied. The dynamics of sorption, characterized by the thermokinetic parameter, appears to be better in the two materials possessing open pore structure, mesoporous carbon Novacarb and esp. the mesoporous silica SBA-15. [on SciFinder (R)]

Details

Item Type Articles
CreatorsLapkin, A., Savill-Jowitt, C., Edler, K. and Brown, R.
Uncontrolled Keywordschemisorption (ammonia chemisorption on h3pw12o40 supported on mesoporous carbon and sba-15), ammonia chemisorption on h3pw12o40 supported on mesoporous carbon and sba-15), chemisorption ammonia keggin tungstophosphoric acid mesoporous carbon sba15, porous materials (mesoporous
DepartmentsFaculty of Engineering & Design > Chemical Engineering
RefereedYes
StatusPublished
ID Code873

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