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

被引:38
作者
Matatov-Meytal, Y [1 ]
Shindler, Y [1 ]
Sheintuch, M [1 ]
机构
[1] Technion Israel Inst Technol, Dept Chem Engn, IL-32000 Haifa, Israel
关键词
Pd catalyst; ACC support; liquid-phase hydrogenation; nitrite; nitrogen;
D O I
10.1016/S0926-3373(03)00126-7
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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 k(eff) = k exp[(pH - pzc)/(pH(0) - 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. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:127 / 134
页数:8
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