期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 52, 期 1, 页码 49-60出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2004.02.019
关键词
atomic force microscopy (AFM); batch-recycle reactor; bimetallic catalysts; catalytic nitrate hydrogenation; energy dispersive X-ray microanalysis (EDX); integrated ion-exchange/catalytic denitritication process; Pd-Cu; Pd-Sn; point of zero charge (pH(pzc)); scanning electron microscopy (SEM)
Catalytic liquid phase nitrate reduction was investigated at T = 298 K and atmospheric pressure in an isothermal batch-recycle reactor in the presence of various Pd-Cu and Pd-Sn bimetallic catalysts supported on alumina spheres with particle diameter of 1.7 mm. It was discovered that Pd-Sn solids synthesized accordingly to various catalyst preparation methods, exhibit considerably lower activity for nitrate removal in comparison to Pd-Cu catalysts. Formation of undesired ammonium ions is favored over Pd-SnPy-Al2O3 catalysts prepared by impregnation and co-impregnation techniques. Acidity and textural properties of alumina supports as well as the presence of chloride ions in the catalyst-solution interface detrimentally influence catalytic performance in the process of liquid phase nitrate hydrogenation. (C) 2004 Elsevier B.V. All rights reserved.
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