2024-03-28T14:12:20Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1896952019-09-27T10:56:47Zcom_10261_101com_10261_5col_10261_354
DIGITAL.CSIC
author
González Carballo, Juan M.
author
Pérez-Alonso, Francisco
author
García-García, Francisco J.
author
Ojeda Pineda, Manuel
author
García Fierro, José Luis
author
Rojas Muñoz, Sergio
funder
Ministerio de Educación, Cultura y Deporte (España)
funder
Ministerio de Ciencia e Innovación (España)
2019-09-02T12:21:22Z
2019-09-02T12:21:22Z
2015-12
Journal of Catalysis 332: 177-186 (2015)
0021-9517
http://hdl.handle.net/10261/189695
10.1016/j.jcat.2015.10.008
1090-2694
http://dx.doi.org/10.13039/501100004837http://dx.doi.org/10.13039/501100003176
The effect of the addition of Cl to Ru/γ-AlO catalysts for the Fischer-Tropsch synthesis has been investigated. A series of four catalysts containing 3 wt.% of Ru supported on γ-AlO and promoted with different amounts of chlorine (Cl/Ru atomic ratios of 0, 1, 5 and 10) has been prepared. The catalysts were tested in the Fischer Tropsch synthesis in a fixed bed reactor. The initial rates for the CO hydrogenation increase with the increasing amount of Cl in the catalyst. However, at the steady-state all catalysts exhibit similar Fischer Tropsch yields, irrespectively of their initial amount of Cl. The nature of the CO adsorption sites in the Cl-promoted Ru/AlO catalysts has been studied by means of DRIFT concluding that Cl addition leads to a higher fraction of CO species adsorbed on Ru atoms with low coordination numbers. In addition, the stability of such CO species, characterized by high frequency bands in the IR, increases with the increasing content of Cl in the catalysts. The reactivity of the CO species in hydrogen atmospheres and under FTS environments has been studied by in situ MS-DRIFT. We have observed that low-coordinated Ru atoms are more reactive for CO dissociation than those in a higher coordination environment. However, the former sites are prone to deactivation during FTS catalysis, at the steady-state, and only CO adsorbed on highly coordinated Ru atoms is observed in the IR spectra. Consequently, all catalysts exhibit the same reaction rates at the steady-state.
eng
closedAccess
Chlorine
Promoter
In situ DRIFT
Ruthenium
Fischer–Tropsch
In-situ study of the promotional effect of chlorine on the Fischer-Tropsch synthesis with Ru/Al2O3
artículo
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URL
https://digital.csic.es/bitstream/10261/189695/1/accesoRestringido.pdf
File
MD5
42637ae8545636bc41605c1740a9a84e
15753
application/pdf
accesoRestringido.pdf