Relationship between carbon morphology and catalyst deactivation in the catalytic decomposition of biogas using Ni, Co and Fe based catalysts

Abstract

A novel approach to the decomposition of biogas consisting in the simultaneous production of syngas (H 2 and CO mixture) and bio-nanostructured filamentous carbon (BNFC) is proposed. Catalysts with different active phases such as Ni, Co or Fe on Al 2 O 3 are studied in the temperature range between 600 and 900 ºC. Their behaviour was analysed considering CH 4 and CO 2 conversions, reaction rates, catalyst stability and carbon production. Additionally, the BNFC produced were characterised by transmission electron microscopy. Depending on the active phase and the reaction temperature, different carbon types were identified: fishbone, parallel and chain-like BNFC and encapsulating carbon. Large amounts of BNFC and good catalyst stability were achieved with the Ni/Al 2 O 3 catalyst at 600 ºC, pointing out that carbon accumulation is not directly responsible of catalyst deactivation and that the key factor is the nature of carbon formed during the reaction.

Hydroxyapatite supported bimetallic cobalt and nickel catalysts for syngas production from dry reforming of methane

“…The main challenge of DRM is related to the catalytic deactivation, together with side reactions such as reserve water-gas-shift reaction (RWGS). The deactivation is mostly due to coke deposition and catalyst modification (active phase and/or support) at high temperature [12][13][14][15]. Thus, much work was devoted to the development of new performing catalysts to prevent catalytic deactivation.…”

Effect of the synthesis conditions of Ni/Al2O3 catalysts on the biogas decomposition to produce H2-rich gas and carbon nanofibers

“…Little information considering NCs production from biogas has been published. Besides previous works carried out by our research group [26,27,38], for the best of our knowledge, only Corthals et al [39] The suitability of the catalysts was analyzed considering activity, stability and carbon yield. Additionally, the NCs produced were characterised by different techniques (XRD, N 2 adsorption, TEM) in order to address the effect of the different catalysts characteristics on the NCs properties and morphology.…”

Methane decomposition for carbon nanotube production: Optimization of the reaction parameters using response surface methodology

“…This slight deactivation in the catalyst is due to the accumulation of nanocarbons on the surface of the catalyst which prevents the active sites from further catalytic reaction at its maximum efficiency (Ashik et al, 2015;de Llobet et al, 2015). …”