Syngas production via combined steam and carbon dioxide reforming of methane over Ni–Ce/MgAl2O4 catalysts with enhanced coke resistance

Koo, Kee Young; Lee, Sung Hun; Jung, Un Ho; Roh, Hyun Seog; Yoon, Wang Lai

doi:10.1016/j.fuproc.2013.11.005

Cited by 146 publications

(56 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In this temperature region, the reduction process is quite complicated to explain since both processes of the reduction of NiO and ceria may have overlapped. The reduction of pure CeO 2 occurs in three stages: (i) the reduction of surface oxygen or oxygen capping species (250-300°C) [44], (ii) the reduction of surface lattice oxygen (450-600°C) [23] and total bulk reduction up to 900°C [21]. On the other hand, the reduction of Ni species from the framework of Mg(Ni,Al)O mixed oxides to metallic nickel is realized in two steps: (i) the reduction of surface NiO (ca.…”

Section: Resultsmentioning

confidence: 99%

Catalytic activity of hydrotalcite-derived catalysts in the dry reforming of methane: on the effect of Ce promotion and feed gas composition

Dębek

Motak

Gálvez

et al. 2017

Reac Kinet Mech Cat

View full text Add to dashboard Cite

Ni/Al and Ni/Mg/Al hydrotalcite-derived materials containing various Ni loadings were synthesized and subsequently promoted with Ce-species via adsorption from [Ce(EDTA)] -complexes. The obtained materials were characterized by elemental analysis (ICP-MS), XRD, H 2 -TPR, CO 2 -TPD, TG and low temperature N 2 sorption experiments. The amount of the introduced Ce was dependent on the nickel and magnesia content in catalysts precursors, and it influenced materials properties (i.e. basicity, reducibility of Ni species) in various ways and the catalytic performance in the dry reforming of methane (DRM). The promoted catalysts showed improved performance with CH 4 and CO 2 conversions at 550°C in the range of 35-55 and 35-45%, respectively. The extent of the improvement was dependent on the nickel content and the presence of magnesia. In general, Ce promotion increased materials stability by changing of the type of carbonaceous deposits. Ce modification hindered the transformation of amorphous carbonaceous deposits to graphitic carbon. The former may be easier oxidized and contribute to syngas production. Two selected catalysts were additionally tested in DRM at elevated temperatures (650 and 750°C) and over various feed gas compositions.

show abstract

Section: Resultsmentioning

confidence: 99%

Catalytic activity of hydrotalcite-derived catalysts in the dry reforming of methane: on the effect of Ce promotion and feed gas composition

Dębek

Motak

Gálvez

et al. 2017

Reac Kinet Mech Cat

View full text Add to dashboard Cite

show abstract

“…It has been shown that, besides the effect of temperature and the type of catalyst on the reaction system, the presence of carbon dioxide could be effective in methane steam reforming. It would enhance the conversion of methane, and it can have a positive influence on the hydrogen production and the H 2 /CO syngas ratio [32][33][34][35]. Furthermore, other studies demonstrated that the carbon deposition (which is very high in dry reforming) is drastically reduced when the steam and CO 2 reforming reactions are carried out simultaneously [25,[35][36][37].…”

Section: Hydrogen Production With Mixed Reformingmentioning

confidence: 99%

“…However, the noble metals have a higher coke resistivity in comparison to transition metals, but their main drawbacks are represented by their high prices and the low availability of noble metals [54]. For these reasons, nickel is a good substitution for noble metals in reforming processes, [55,56] and in the specialized literature, several studies dealt with the utilization of Ni-based catalyst for mixed steam reforming [57][58][59][60][61][62][63][64][65][66].…”

Section: Hydrogen Production With Mixed Reformingmentioning

confidence: 99%

Pure Hydrogen Production in Membrane Reactor with Mixed Reforming Reaction by Utilizing Waste Gas: A Case Study

et al. 2016

View full text Add to dashboard Cite

A rise in CO2 and other greenhouse gases’ concentration from gas refinery flares and furnaces in the atmosphere causes environmental problems. In this work, a new process was designed to use waste gas (flue gas and flare gas) of a domestic gas refinery to produce pure hydrogen in a membrane reactor. In particular, the process foresees that the energy and CO2 content of flue gas can provide the heat of the mixed reforming reaction to convert flare gas into hydrogen. Furthermore, the characteristics of the feed stream were obtained via simulation. Then, an experimental setup was built up to investigate the performance of a membrane reactor allocating an unsupported dense Pd-Ag membrane at the mentioned conditions. In this regard, a Ni/CeO2 catalyst was loaded in the membrane reformer for mixed reforming reaction, operating at 450 °C, in a pressure range between 100 and 350 kPa and a gas hourly space velocity of around 1000 h−1. The experimental results in terms of methane conversion, hydrogen recovery and yield, as well as products’ compositions are reported. The best results of this work were observed at 350 kPa, where the MR was able to achieve about 64%, 52% and 50% for methane conversion, hydrogen yield and recovery, respectively. Furthermore, with the assistance of the experimental tests, the proposed process was simulated in the scaling up to calculate the needed surface area for MR in the domestic gas refinery.

show abstract

“…With the exception of Ni(n-e), the TPR profiles show two welldefined reduction peaks. The small peak (α peak) at low temperature could be assigned to Ni 2+ species weakly interacted with the MgAl 2 O 4 , to Ni 2+ interacted with CeO 2 particles and to the surface reduction of Ce 4+ [38][39][40]. From thermodynamics bulk CeO 2 is reduced to Ce 2 O 3 at high temperature (1300 °C, [41]).…”

Section: Characterization Of Fresh Catalystmentioning

confidence: 99%

Removal of anionic dye from aqueous solution using a cationic carrier

Muthuraman

Ibrahim

2013

International Journal of Industrial Chemistry

View full text Add to dashboard Cite

Ethanol steam reforming was studied over Ni/MgAl 2 O 4 -CeO 2 catalysts. The catalysts were prepared using different impregnation media (ethanol or water) and Ni precursors (nitrate or acetate). The use of an alcoholic solution did not affect the specific surface area, but promoted the NiO formation reducible at lower temperature affecting the Ni-support interactions and the Ce 3+ /Ce 4+ initial ratios. All catalysts were highly active in the reforming reaction of ethanol with a high initial conversion of ethanol under more severe conditions than those commonly used in literature. The best catalytic behavior was found over the catalyst prepared from an ethanolic solution of Ni(NO 3 ) 2 . This sample showed a high Ce 3+ /Ce 4+ ratio, an adequate interaction Ni-support and an average Ni diameter around 28 nm. This catalyst was stable under the reforming conditions used in this work: initial ethanol concentration: 9.4%, reaction temperature: 650 °C, W/F = 49 g min mol −1 C 2 H 5 OH and reaction time: 40 h. The ethanol conversion was almost complete with H 2 selectivity around 78%.

show abstract

Syngas production via combined steam and carbon dioxide reforming of methane over Ni–Ce/MgAl2O4 catalysts with enhanced coke resistance

Cited by 146 publications

References 31 publications

Catalytic activity of hydrotalcite-derived catalysts in the dry reforming of methane: on the effect of Ce promotion and feed gas composition

Catalytic activity of hydrotalcite-derived catalysts in the dry reforming of methane: on the effect of Ce promotion and feed gas composition

Pure Hydrogen Production in Membrane Reactor with Mixed Reforming Reaction by Utilizing Waste Gas: A Case Study

Removal of anionic dye from aqueous solution using a cationic carrier

Contact Info

Product

Resources

About