Carbon dioxide reforming of methane for syngas production over Co–MgO mixed oxide nanocatalysts

Mirzaei, Fateme; Rezaei, Mehran; Meshkani, Fereshteh; Fattah, Zohreh

doi:10.1016/j.jiec.2014.03.034

Cited by 82 publications

(17 citation statements)

References 28 publications

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“…These changes are increasingly viewed as a threat to both the global economy and the natural environment [1][2][3][4]. This increase in CO 2 is mainly attributed to human activities [5][6][7][8][9][10]. However, methane (bases: CH 4 50%-70%, CO 2 30%-40%) is one of reproducible biomass energy, which can obtain available energy sources, but also generate abundant greenhouse gas that goes against the purity of CH 4 [10].…”

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confidence: 99%

KOH-activated graphite nanofibers as CO₂adsorbents

Yuan¹,

Meng²,

Park³

2016

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Porous carbons have attracted much attention for their novel application in gas storage. In this study, porous graphite nano-fiber (PGNFs)-based graphite nano fibers (GNFs) were prepared by KOH activation to act as adsorbents. The GNFs were activated with KOH by changing the GNF/KOH weight ratio from 0 through 5 at 900°C. The effects of the GNF/ KOH weight ratios on the pore structures were also addressed with scanning electron microscope and N 2 adsorption/desorption measurements. We found that the activated GNFs exhibited a gradual increase of CO 2 adsorption capacity at CK-3 and then decreased to CK-5, as determined by CO 2 adsorption isotherms. CK-3 had the narrowest micropore size distribution (0.6-0.78 nm) among the treated GNFs. Therefore, KOH activation was not only a significant method for developing a suitable pore-size distribution for gas adsorption, but also increased CO 2 adsorption capacity as well. The study indicated that the sample prepared with a weight ratio of '3' showed the best CO 2 adsorption capacity (70.8 mg/g) as determined by CO 2 adsorption isotherms at 298 K and 1 bar. Key words: activated graphite nanofibers, KOH treatment, CO 2 adsorptionThe rapid increase of the greenhouse gas carbon dioxide (CO 2 ) in the atmosphere is generally thought to be a major factor in climate change. These changes are increasingly viewed as a threat to both the global economy and the natural environment [1][2][3][4]. This increase in CO 2 is mainly attributed to human activities [5][6][7][8][9][10]. However, methane (bases: CH 4 50%-70%, CO 2 30%-40%) is one of reproducible biomass energy, which can obtain available energy sources, but also generate abundant greenhouse gas that goes against the purity of CH 4 [10]. It is essential to find an ideal material to work out the austere problem. Usually, CO 2 capture and storage is an efficient green technology used to reduce emissions by transporting and storing CO 2 in deep geologic formations. The capture methods can be classified as post-combustion, pre-combustion, and air separation followed by oxyfuel combustion [7]. Among the currently available technologies, post-combustion is the most easily applied technology. It involves use of absorption, adsorption, cryogenic distillation, membranes, and gas hydrates.Up to now, high-performance adsorbents have been widely used for CO 2 capture. Conventional solid adsorbents include zeolites [11], activated carbon [12], mesoporous silica [13], metal oxide-based adsorbents (e.g., MgO and CaO) [14], and metal-organic frameworks (MOFs) [15]. Nevertheless, in each case, there are defects in the adsorption process. Zeolites and mesoporous silica have the drawback of poor CO 2 capture performance. With zeolites, adsorption of moisture could affect the stability of the zeolite frameworks, and demands high regeneration temperature (>573 K). This results in huge energy consumption for CO 2 desorption. Meanwhile, although the adsorption capacity for CO 2 of activated carbon is high due to pore sizes ranging from micr...

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confidence: 99%

KOH-activated graphite nanofibers as CO₂adsorbents

Yuan¹,

Meng²,

Park³

2016

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“…A more recent study by the same group [41] has reported that the BET surface area of the 20 wt % Co/80 wt % CeO 2 is almost double of the pristine CeO 2 support which implies the good dispersion of Co metals. Other support materials are also reported in literature as excellent candidates that are considered for Co-based catalysts, such as Nd 2 O 3 [42], La 2 O 3 [43], and MgO [44]. A common observation was realized on most of the Co-based systems, regarding the noticeable improvement in the catalyst textural properties after the impregnation of up to 20 wt % Co into the support surface.…”

Section: Effects Of the Support On The Catalytic Activity In Drmmentioning

confidence: 91%

“…TEM images have revealed that a small spherical Co particles (10 nm) were identified and the formation of Co-Mg solid solution with reduction temperature greater than 400 • C was confirmed using H 2 -TPR. The catalyst that was prepared at 10 wt % Co loading was found to show 67% CH 4 conversion and was stable up to 15 h at 700 • C. A deeper look at the SEM image (Figure 3) of 10 wt % Co/MgO clearly shows the formation of whisker type coke that did not hindered the accessibility of the reactant feed to the active Co sites [44]. As discussed previously for the case of Ni/MgO, the basicity of the MgO support that induces the adsorption of CO 2 combined with its high surface area are the main features for their deployment as a stable supports in DRM [14].…”

Section: Effects Of the Support On The Catalytic Activity In Drmmentioning

confidence: 94%

“…Similarly, the pristine Nd 2 O 3 surface area was almost tripled from 6.7 m 2 /g upon the impregnation of 20 wt % Co into the support surface [42]. To address the catalyst deactivation issue of Co-based catalysts Mirzaei et al [44] has impregnated 5-30 wt % Co into MgO supports using co-precipitation method. TEM images have revealed that a small spherical Co particles (10 nm) were identified and the formation of Co-Mg solid solution with reduction temperature greater than 400 • C was confirmed using H 2 -TPR.…”

Section: Effects Of the Support On The Catalytic Activity In Drmmentioning

confidence: 99%

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Recent Advances in Supported Metal Catalysts for Syngas Production from Methane

2018

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Abstract:Over the past few years, great attention is paid to syngas production processes from different resources especially from abundant sources, such as methane. This review of the literature is intended for syngas production from methane through the dry reforming (DRM) and the steam reforming of methane (SRM). The catalyst development for DRM and SRM represents the key factor to realize a commercial application through the utilization of more efficient catalytic systems. Due to the enormous amount of published literature in this field, the current work is mainly dedicated to the most recent achievements in the metal-oxide catalyst development for DRM and SRM in the past five years. Ni-based supported catalysts are considered the most widely used catalysts for DRM and SRM, which are commercially available; hence, this review has focused on the recent advancements achieved in Ni catalysts with special focus on the various attempts to address the catalyst deactivation challenge in both DRM and SRM applications. Furthermore, other catalytic systems, including Co-based catalysts, noble metals (Pt, Rh, Ru, and Ir), and bimetallic systems have been included in this literature review to understand the observed improvements in the catalytic activities and coke suppression property of these catalysts.

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“…Xua et al [9] found the ordered mesoporous NiO-MgO-Al 2 O 3 composite oxides promised a series of novel and stable catalyst candidates for carbon dioxide reforming of methane reaction. Mirzaei et al [10] investigated carbon dioxide reforming of methane over nanostructure Co-MgO mixed oxide catalysts, and found cobalt content of 10 wt.% had the highest activity and stability in dry reforming reaction. The thermal performances of methane reforming are analyzed with different methods.…”

Section: Introductionmentioning

confidence: 99%