Cloth catalysts in water denitrification III. pH inhibition of nitrite hydrogenation over Pd/ACC

TY - JOUR

T1 - Cloth catalysts in water denitrification III. pH inhibition of nitrite hydrogenation over Pd/ACC

AU - Matatov-Meytal, Yu

AU - Shindler, Yu

AU - Sheintuch, M.

N1 - Funding Information: Research supported by Ministry of Science and the Water Research Institute. YMM and YS acknowledge the support of the Center for Adsorption in Science of the Ministry of Immigrant Absorption and the Committee for Planning and Budgeting of the Council for Higher Education, State of Israel.

PY - 2003/9/30

Y1 - 2003/9/30

N2 - Nitrite hydrogenation over Pd supported on an activated carbon cloth (ACC) has been investigated in an isothermal semi-batch reactor. The reaction is accompanied by increasing pH, which inhibits the reaction. The rate was corrected for pH changes and the reaction was found to be first-order with respect to nitrite concentration and zero-order with respect to hydrogen pressure. The corrected rate constant is of the form keff = k exp[(pH - pzc)/(pH0 - pzc)], where k is the intrinsic constant and the pzc is the point of zero charge of catalyst surface. While Pd/ACC catalysts yield better rates than those of Pd supported on glass fiber cloth (GFC), they exhibit much poorer selectivity (in the unbuffered reaction conditions) due to ACC surface enrichment by hydrogen.

AB - Nitrite hydrogenation over Pd supported on an activated carbon cloth (ACC) has been investigated in an isothermal semi-batch reactor. The reaction is accompanied by increasing pH, which inhibits the reaction. The rate was corrected for pH changes and the reaction was found to be first-order with respect to nitrite concentration and zero-order with respect to hydrogen pressure. The corrected rate constant is of the form keff = k exp[(pH - pzc)/(pH0 - pzc)], where k is the intrinsic constant and the pzc is the point of zero charge of catalyst surface. While Pd/ACC catalysts yield better rates than those of Pd supported on glass fiber cloth (GFC), they exhibit much poorer selectivity (in the unbuffered reaction conditions) due to ACC surface enrichment by hydrogen.

KW - ACC support

KW - Liquid-phase hydrogenation

KW - Nitrite

KW - Nitrogen

KW - Pd catalyst

UR - http://www.scopus.com/inward/record.url?scp=0042413815&partnerID=8YFLogxK

U2 - 10.1016/S0926-3373(03)00126-7

DO - 10.1016/S0926-3373(03)00126-7

M3 - 文章

AN - SCOPUS:0042413815

SN - 0926-3373

VL - 45

SP - 127

EP - 134

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

IS - 2

ER -