Pd-Cu/AC and Pt-Cu/AC catalysts for nitrate reduction with hydrogen Influence of calcination and reduction temperatures

• Tipo: Artigo em Revista Científica Internacional
• Data: 2010

Autores

O. S. G. P. Soares (Autor) FEUP; J. J. M. Órfão (Autor) FEUP; J. Ruiz-Martínez (Autor) Outra; J. Silvestre-Albero (Autor) Outra; A. Sepúlveda-Escribano (Autor) Outra; M. F. R. Pereira (Autor) FEUP

Revista

Título: Chemical Engineering Journal

Vol. 165

Páginas: 78-88

ISSN: 1385-8947

Editora: Elsevier

Indexação

ISI Web of Knowledge - 64 Citações

ISI Web of Science

Scopus - 75 Citações

INSPEC

COMPENDEX

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Outras ciências da engenharia e tecnologias

Outras Informações

ID Authenticus: P-003-0ZK

DOI: 10.1016/j.cej.2010.08.065

Abstract (EN): The influence of calcination and reduction temperatures on the catalytic properties of Pd-Cu and Pt-Cu bimetallic catalysts supported on activated carbon for the reduction of nitrates was studied The catalysts were prepared using different calcination and reduction temperatures and the respective activities and selectivities for the reduction of nitrates in water with hydrogen were assessed It was found that the different preparation conditions lead to different catalytic performances For both catalysts the activity decreases by increasing calcination and reduction temperatures whereas the effect on the selectivity is not uniform For the 1%Pd-0 3%Cu (wt %) catalyst the nitrate conversion after 5 h of reaction varies from 93% (sample calcined at 200 C and not reduced) to 25% (sample calcined and reduced at 400 C) The formation of alloys during the preparation of the catalysts is prejudicial for nitrate reduction In all the preparation conditions tested the Pd-Cu pair is more selective for the transformation of nitrate into nitrogen All the samples have been characterized by nitrogen adsorption at -196 C CO adsorption microcalorimetry TPR XRD XPS and TEM

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11