Catalysis Today

Autor: Costa, João Luís Rangel, Marchetti, Gustavo Sérgio, Varela, Maria do Carmo Rangel Santos
Jazyk: angličtina
Rok vydání: 2002
Předmět:
Zdroj: Repositório Institucional da UFBA
Universidade Federal da Bahia (UFBA)
instacron:UFBA
ISSN: 0920-5861
DOI: 10.1016/S0920-5861(02)00246-8
Popis: Texto completo: acesso restrito. p.205-213 Submitted by Suelen Reis (suelen_suzane@hotmail.com) on 2012-12-10T19:46:08Z No. of bitstreams: 1 1-s2.0-S0920586102002468-main.pdf: 161696 bytes, checksum: 45a5f8ecc6bbd987ca757b2f5d0876e1 (MD5) Made available in DSpace on 2012-12-10T19:46:08Z (GMT). No. of bitstreams: 1 1-s2.0-S0920586102002468-main.pdf: 161696 bytes, checksum: 45a5f8ecc6bbd987ca757b2f5d0876e1 (MD5) Previous issue date: 2002-12 The reforming of natural gas feedstock in the presence of steam is the main industrial route to produce high purity hydrogen. However, this process also produces carbon oxides which can poison most hydrogenation catalysts as well as ammonia catalysts. In industrial processes, these compounds are often removed from the gaseous stream by the water gas shift reaction (WGSR), which is performed in two steps due to thermodynamics and kinetics considerations. A chromium and copper-doped hematite has been recently proposed as an industrial catalyst in the high temperature shift (HTS). This solid shows a stable performance but the search for non-toxic systems is much needed due to environmental restrictions related to chromium compounds. In this work, the use of thorium instead of chromium in iron- and copper-based catalysts for the HTS reaction was investigated. Catalysts were prepared in the active form (magnetite) in order to save energy, characterized by several techniques and then evaluated in operational conditions close to the industrial ones. It was found that thorium can replace chromium in these catalysts leading to better catalytic properties as compared to chromium. The catalyst has the advantage of being less toxic and can be prepared in the active phase.
Databáze: OpenAIRE
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