A comparison between the precipitation and impregnation methods for water-gas shift catalysts

Authors
Pereira, Amalia Luz C.; Berrocal, Guillermo Jose P.; Marchetti, Sergio Gustavo; Albornoz, Alberto; de Souza, Alexilda O.; Rangel, Maria do Carmo
Publication Year
2007
Language
English
Format
article
Status
Published version
Description
The precipitation and impregnation methods in the preparation of chromium-doped magnetite for water gas shift reaction (WGSR) were compared in this work. This reaction is an important step in the commercial production of highly pure hydrogen from natural gas or naphtha feedstocks. It was found that the preparation method affects both the textural and catalytic properties of chromium-doped magnetite. However, chromium was able to preserve the specific surface area during the WGSR and to delay the metallic iron production, independently of the preparation method. Chromium caused a decrease in activity per area, depending on the preparation method. This fact was assigned to its ability in making the production of Fe2+ species more difficult, making the catalytic sites less active, because the redox cycle of the reaction becomes more difficult. The most active catalyst was obtained by adding chromium by impregnation, which led to a large amount of total chromium in the solid and then a catalyst with high specific surface area was produced. It was showed that the catalysts can be prepared in the active phase avoiding the reduction step, before reaction
Fil: Pereira, Amalia Luz C.. Universidade Federal da Bahia. Instituto de Quımica; Brasil
Fil: Berrocal, Guillermo Jose P.. Universidade Federal da Bahia. Instituto de Quımica; Brasil
Fil: Marchetti, Sergio Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas ; Argentina
Fil: Albornoz, Alberto. Instituto Venezolano de Investigaciones Cientıficas. Centro de Quımica; Venezuela
Fil: de Souza, Alexilda O.. Universidade Estadual do Sudoeste da Bahia; Brasil
Fil: Rangel, Maria do Carmo. Universidade Federal da Bahia. Instituto de Quımica; Brasil
Subject
Chromium-doped magnetite
Hydrogen
WGSR
Otras Ingeniería Química
Ingeniería Química
INGENIERÍAS Y TECNOLOGÍAS
Access level
Restricted access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/32424