Abstract
To promote the adsorption and activation of carbon dioxide in the dry reforming of methane (DRM), Ni and Al2O3 were coprecipitated on activated carbon fibers (ACF). Various characterization methods were adopted in order to investigate the surface characteristics of different catalysts. Chemisorption characterization results, such as H2-temperature programmed reduction (H2-TPR), H2-temperature programmed desorption (H2-TPD), and CO2-temperature programmed desorption (CO2-TPD) illustrated that ACF in a nickel-based catalyst could enhance the basic sites and improve the metal dispersion on a catalyst surface, which is beneficial for the adsorption and activation of feed gas. The coprecipitated coating on ACF proved by scanning electron microscope (SEM) can prevent the carbon of ACF from participating in the reaction, while retain good surface properties of carbon fibers. X-ray diffraction (XRD) patterns illustrated that the ACF in a nickel-based catalyst could decrease the crystallite size of the spinel NiAl2O4, which is beneficial for methane reforming. In addition, the Fourier transform infrared spectroscopy (FTIR) of different catalysts revealed that the added ACF could provide abundant functional groups on the surface, which could be the intermediate product of DRM, and effectively promote the reaction. Different to the catalyst supported on single alumina, the performance evaluation and stability test proved that the catalyst added with ACF exhibited a better catalytic performance especially for CO2 conversion. Moreover, based on the characterization results as well as some related literature, the dry reforming mechanism over optimum catalyst was derived.
Highlights
The syngas (H2 and CO) commonly used for organic synthesis is mainly obtained by coal gasification and the steam reforming of methane (SRM) [1]
Ni–γ–Al2 O3 /activated carbon fibers (ACF), and the catalysts supported on single γ–Al2 O3 and ACF will be named Ni–γ–Al2 O3 and Ni/ACF, respectively
Ni and Al2 O3 were coprecipitated on ACF in order to obtain various catalysts with a different ratio of Al2 O3 to ACF, used for dioxide reforming of methane (DRM)
Summary
The syngas (H2 and CO) commonly used for organic synthesis is mainly obtained by coal gasification and the steam reforming of methane (SRM) [1]. The carbon dioxide reforming of methane (DRM) has attracted considerable attention [2,3] for its comprehensive utilization of two main greenhouse gases [4,5]. The catalyst used for SRM is a nickel-based catalyst supported on alumina, because of its low cost and relatively high activity [6,7,8]. It is not recommendable to apply into DRM directly, for the easy carbon deposition and sintering [9]. It is known that carbon deposition is due to the active carbon from methane cracking, which cannot promptly react with
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