Syngas production via CO2 reforming of methane using Co-Sr-Al catalyst

Fakeeha, Anis H.; Naeem, Muhammad Awais; Khan, Wasim Ullah; Al‐Fatesh, Ahmed S.

doi:10.1016/j.jiec.2013.05.013

Cited by 55 publications

(45 citation statements)

References 37 publications

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“…The alkali promotion might minimise carbon formation and hence favour the accessibility of reactants to the active sites. The same effect on activity was also reported by Fakeeha et al for Sr-promoted cobalt catalysts 12 . Additionally, the higher degree of reduction exhibited by MgCoAl (Table 2) also contributes to higher activity because the metallic Co phase is more active than the Co oxide species for the reforming reaction.…”

Section: Resultssupporting

confidence: 85%

“…Thus, the overall CO 2 -TPD profiles depict the enhancement in the Lewis basicity of samples. Fakeeha et al observed the same trend for Sr-promoted Co-Al catalysts 12 . However, Figure 4 highlights that the peaks are shifted towards higher temperatures for the LiCoAl material, thus providing evidence of the role of Li in the strength of the alkaline sites for this catalyst.…”

Section: Resultsmentioning

confidence: 58%

“…As a result, this material inhibits coke formation by the adsorption of CO 2 species on the surface and hence promotes CO 2 reaction with deposited carbon by the reverse of the Boudouard reaction 5 . In the same way, Fakeeha and co-workers revealed that addition of Sr leads to coke suppression by improving the interaction between Co and the support and the Lewis basicity of the samples 12 . Similar results for alkali promotion were observed for Ni-based catalysts, which included K, Li, La, Mg, Ba and Ca [13][14][15][16][17][18][19] .…”

Section: Introductionmentioning

confidence: 80%

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Dry reforming of methane at moderate temperatures over modified Co-Al Co-precipitated catalysts

2014

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M-Co-Al (M = Ca, La, Li or Mg) materials were synthesised by co-precipitation and investigated for dry reforming of methane. Thermogravimetry, temperature-programmed oxidation, reduction and CO 2 desorption, specific area and X-ray diffraction were utilised for characterisation. Activity tests were conducted at atmospheric pressure, temperatures between 400-550°C , CH 4 /CO 2 molar ratio of 1 and GHSV of 6000 NmL CH 4 ·g -1 ·h -1 . The partial substitution of Co by a third element increased the area and changed the acid/base properties, reducibility and crystallinity of the oxides. These modifications resulted in higher activity for dry reforming of methane, mainly related to the decrease in the acidity of the promoted materials and, consequently, lower carbon formation. The Li-modified sample presented the lowest coke deposition due to the increase in stronger basic sites. The Mg-promoted catalyst exhibited the best activity performance. This depicts the enhancement in the reducibility and acid/base properties found in the MgCoAl sample.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 80%

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Dry reforming of methane at moderate temperatures over modified Co-Al Co-precipitated catalysts

2014

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“…The basic sites can be classified according to their strength related to the CO 2 temperature desorption peaks as weak (50-200 • C), intermediate (200-400 • C), strong (400-650 • C) and very strong (>650 • C). This is because the CO 2 adsorbed on the weaker basic sites is desorbed at relatively low temperature, while the CO 2 adsorbed on the stronger sites is desorbed at somewhat high temperature (Fakeeha et al, 2014). Typically, for solid oxides the basic sites can be attributed to: (i) weak associated with weak Brønsted OH groups, (ii) medium strength metaloxygen Lewis pairs and (iii) strong Lewis basic sites associated with oxygen anions (Debecker et al, 2009;Gac, 2011).…”

Section: Surface Acidity and Basicitymentioning

confidence: 99%

The Effect of WO3 Modification of ZrO2 Support on the Ni-Catalyzed Dry Reforming of Biogas Reaction for Syngas Production

Charisiou

Siakavelas

Papageridis

et al. 2017

Front. Environ. Sci.

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The time-on-stream catalytic performance and stability of 8 wt. % Ni catalyst supported on two commercially available catalytic supports, ZrO 2 and 15 wt.% WO 3 -ZrO 2 , was investigated under the biogas dry reforming reaction for syngas production, at 750 • C and a biogas quality equal to CH 4 /CO 2 = 1.5, that represents a common concentration of real biogas. A number of analytical techniques such as N 2 adsorption/desorption (BET method), XRD, H 2 -TPR, NH 3 -and CO 2 -TPD, SEM, ICP, thermal analysis (TGA/DTG) and Raman spectroscopy were used in order to determine textural, structural and other physicochemical properties of the catalytic materials, and the type of carbon deposited on the catalytic surface of spent samples. These techniques were used in an attempt to understand better the effects of WO 3 -induced modifications on the catalyst morphology, physicochemical properties and catalytic performance. Although Ni dispersion and reducibility characteristics were found superior on the modified Ni/WZr sample than that on Ni/Zr, its dry reforming of methane (DRM) performance was inferior; a result attributed to the enhanced acidity and complete loss of the basicity recorded on this catalyst, an effect that competes and finally overshadows the benefits of the other superior properties. Raman studies revealed that the degree of graphitization decreases with the insertion of WO 3 in the crystalline structure of the ZrO 2 support, as the I D /I G peak intensity ratio is 1.03 for the Ni/Zr and 1.29 for the Ni/WZr catalyst.

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“…The reduction of Co 3 O 4 to Co 0 is known to takes place at these temperatures. Additionally to the further reduction of the iron oxides to metallic iron, the hydrogen consumption at higher temperatures might also include the reduction of the CoAl 2 O 4 phase identified by the XRD analysis (Figure 2-a) (Hermes et al, 2011;Cai et al, 2013;Escobar and Perez-Lopez, 2014;Fakeeha et al, 2014).…”

Section: Resultsmentioning

confidence: 99%

Synthesis, characterisation and catalytic performance of Cu- and Co-modified Fe-Al co-precipitated catalysts for the steam reforming of ethanol

2014

Issue 6

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This paper reports the synthesis and the investigation of the properties and performance of Fe-Al catalysts modified with Cu or Co for the steam reforming of ethanol. The materials were prepared by the precipitation method with different Fe/Al ratios. The samples were characterised by the S BET , TG/DTG, XRD, H 2 -TPR and TPO/DTA analyses. The increase in the Fe/Al ratio leads to a decrease in the specific surface area and shifts the reduction peaks towards higher temperatures. The partial substitution of Fe by Co or Cu modifies the structure of the materials because higher specific surface areas and crystallites of iron oxides with smaller sizes are formed. The promotion also improves the reducibility of the iron species. These changes provide higher activity and selectivity towards H 2 and CO for the modified samples and for the samples with lower Fe/Al ratio. The Co-containing catalyst showed the best performance because this sample exhibited the highest conversions and selectivity towards both H 2 and CO and the lowest formation of coke according to the TPO analysis.

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Syngas production via CO2 reforming of methane using Co-Sr-Al catalyst

Cited by 55 publications

References 37 publications

Dry reforming of methane at moderate temperatures over modified Co-Al Co-precipitated catalysts

Dry reforming of methane at moderate temperatures over modified Co-Al Co-precipitated catalysts

The Effect of WO3 Modification of ZrO2 Support on the Ni-Catalyzed Dry Reforming of Biogas Reaction for Syngas Production

Synthesis, characterisation and catalytic performance of Cu- and Co-modified Fe-Al co-precipitated catalysts for the steam reforming of ethanol

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