On the Way to a More Open Porous Network of a Co–Re/Al2O3 Catalyst for Fischer–Tropsch Synthesis: Pore Size and Particle Size Effects on Its Performance
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- 作者：David Merino ; Iñigo Pérez-Miqueo ; Oihane Sanz ; Mario Montes
- 关键词：Fischer–Tropsch synthesis ; Macro ; mesoporosity ; Diffusion limitations ; CoRe/Al2O3
- 刊名：Topics in Catalysis
- 出版年：2016
- 出版时间：February 2016
- 年：2016
- 卷：59
- 期：2-4
- 页码：207-218
- 全文大小：934 KB
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Iñigo Pérez-Miqueo (1)
Oihane Sanz (1)
Mario Montes (1)
1. Department of Applied Chemistry, University of the Basque Country (UPV/EHU), UFI 11/56, Paseo M. Lardizabal 3, 20018, San Sebastián, Spain - 刊物主题：Catalysis; Physical Chemistry; Pharmacy; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation of Materials;
- 出版者：Springer US
- ISSN：1572-9028
文摘
Five different γ-alumina supports were used, one commercial and four prepared in a macro-mesoporosity range of 7–1000 nm by different preparation methods. A simple method was used to obtain a macro-mesoporous alumina support by modification of an initial commercial mesoporous alumina with a pore generating agent. Supports were used to prepare Fischer–Tropsch synthesis (FTS) catalysts. Supports and catalysts were characterized by several techniques and tested in a lab-scale fixed-bed reaction unit in the FTS at 493 K and 2 MPa, with small (<63 μm) and large (500–710 μm) catalyst particle size (PS). Catalytic results showed that with small catalyst PS, the behavior is similar among them. With large catalyst PS, C5+ selectivity considerably decreased and CH4 selectivity increased for all catalysts due to diffusional restrictions. Nevertheless, the effect of diffusion limitations of reactants and products through catalyst pores were lower for catalysts with a higher mesoporosity (20–50 nm), and much lower for the catalyst obtained when the support was modified to add macroporosity between 100 and 1000 nm. These macropores improve the transport of reactants and heavy hydrocarbons produced between the gaseous phase and the active sites. As a consequence, a better performance of the catalyst is attained, reducing the non-desirable effects of a diffusion-limited regime. Keywords Fischer–Tropsch synthesis Macro-mesoporosity Diffusion limitations CoRe/Al2O3