Challenges in CH4 + CO2 Reforming

Seshan, Kulathuiyer; Lercher, Johannes A.

doi:10.1016/b978-1-85573-799-0.50007-8

Cited by 8 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The present global warming has been attributed to a large increase in the CO 2 concentration in the atmosphere [1,2]. Environmental concerns over the increasing CO 2 concentration have recently driven the interest of CO 2 conversion particularly for the production of syngas by CO 2 reforming (commonly called as dry reforming) of methane [2,4]. Since, the last few years, the research activities on the CO 2 reforming have gained a lot of momentum.…”

Section: Introductionmentioning

confidence: 99%

Carbon-free dry reforming of methane to syngas over NdCoO3 perovskite-type mixed metal oxide catalyst

et al. 2005

View full text Add to dashboard Cite

CoNdO x (Co/Nd = 1) is a highly promising catalyst for the carbon-free CO 2 reforming of methane. Influence of the Co/Nd ratio on the catalyst performance in the CO 2 reforming and also on the crystalline phases and reduction by temperature programmed reduction (TPR) of the CoNdO x catalyst has also been investigated. The CoNdO x (CoNd = 1.0) catalyst consisted of mainly NdCoO 3 perovskite-type mixed metal oxide and it showed not only a high resistance to carbon formation at different process conditions (viz. temperature = 750-900°C and gas hourly space velocity (GHSV) = 10000-50000 cm 3 g )1 h )1 ) but also high activity and selectivity in the CO 2 reforming process. The high resistance to carbon formation for this catalyst is attributed mostly to strong metal (Co°)-support (Nd 2 O 3 ) interactions.KEY WORDS: CO 2 reforming of methane to syngas; CoNdO x catalyst; NdCoO 3 perovskite; resistance to carbon formation in CO 2 reforming.

show abstract

Section: Introductionmentioning

confidence: 99%

Carbon-free dry reforming of methane to syngas over NdCoO3 perovskite-type mixed metal oxide catalyst

et al. 2005

View full text Add to dashboard Cite

show abstract

“…Design of efficient catalysts for oxidation of carbon monoxide at low temperatures is an important and most demanding research topic during the last several years. [1][2][3] The catalytic oxidation of CO is most significant subject due to its eventual applications in different areas of chemical research. Particularly, these applications include air-purification devices for respiratory protection, pollution control devices for reducing industrial and environmental emissions, removal of trace quantities of CO from the ambient air in enclosed atmospheres such as submarines and space craft, and carbon dioxide lasers.…”

Section: Introductionmentioning

confidence: 99%

Copper Promoted Cobalt and Nickel Catalysts Supported on Ceria−Alumina Mixed Oxide: Structural Characterization and CO Oxidation Activity

Reddy

Rao

Bharali

2009

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Catalytic activity of CoO, NiO, CuO-CoO, and CuO-NiO nanocrystalline mono-and bimetallic catalysts over a thermally stable and high surface area ceria-alumina mixed oxide support was evaluated for oxidation of carbon monoxide at normal atmospheric pressure and lower temperatures. The content of Co or Ni in the respective monometallic catalysts was 10 wt % and the Cu-promoted samples contained 5 wt % each. These catalysts were prepared by a wet impregnation procedure and the CeO 2 -Al 2 O 3 support was obtained by a deposition precipitation method. The synthesized catalysts were characterized by BET surface area, X-ray diffraction (XRD), energy dispersive X-ray microanalysis (EDX), temperature-programmed reduction (TPR), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) techniques. XRD patterns of 773 K calcined samples revealed the presence of metal oxide phases, namely, CeO 2 , CuO, NiO, and Co 3 O 4 in the respective catalysts. However, after calcination at 1073 K, the XRD lines corresponding to CuO and NiO were absent. EDX results confirmed the actual amount of metal loadings in the respective catalysts. The H 2 -TPR results suggested that Cu-doping accelerates and decreases the onset reduction temperature of monometallic samples. Raman results of 773 K calcined samples showed a prominent broad peak at 461 cm -1 corresponding to the F 2g Raman active mode of CeO 2 . The TEM studies confirmed the presence of nanosized composite oxides with narrow size distribution of metal oxide particles. The XPS results disclosed the presence of Cu 1+ species along with Cu 2+ and the promotional effect of Cu in Cocontaining samples to suppress the formation of the CoAl 2 O 4 phase. Among different catalysts, the copper promoted CuO-NiO/CeO 2 -Al 2 O 3 sample exhibited better activity for CO oxidation at lower temperatures. The better activity of the catalyst is attributed to the formation of well-dispersed and highly reducible metal oxide species over the mixed oxide support.

show abstract

“…CO 2 re-forming of methane over heterogeneous catalysts to produce a syngas with equal moles of CO and H 2 is one of the attractive routes for the utilization of the methane and CO 2 resources. − Some natural gas reservoirs contain, in addition to methane, also a large fraction of CO 2 . Moreover, the use of CO 2 provides a clean and cheaper oxygen source for the reaction, which eliminates the costly separation processes required for partial oxidation of methane.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the use of CO 2 provides a clean and cheaper oxygen source for the reaction, which eliminates the costly separation processes required for partial oxidation of methane. This reaction is also considered for energy transformation or chemical heat-pipe applications. − Ni-based catalysts possess high initial activity for the reaction but suffer from a rapid deactivation due to carbon deposition, which hinders the process from industrial applications. , In earlier work, we demonstrated − that the use of nano-ZrO 2 particles (15−20 nm) as “support” for nickel catalyst led to extremely stable Ni/ZrO 2 catalysts that are highly active for the CO 2 /CH 4 reaction. We have discovered that a change of the conventional hydrogels of metal hydroxides to their alcogels followed by nanocrystal formation under controlled atmospheres at elevated temperature can lead to size control synthesis of nanocrystals of zirconia and other oxides. , This discovery makes it possible to address the particle size effect of ZrO 2 “support” on the performance of Ni catalyst by reducing the particle size of ZrO 2 down to the extent that it becomes indistinguishable from particles of the metal catalyst.…”

Section: Introductionmentioning

confidence: 99%

Size Limit of Support Particles in an Oxide-Supported Metal Catalyst: Nanocomposite Ni/ZrO₂ for Utilization of Natural Gas

Jin

et al. 2003

J. Phys. Chem. B

112

View full text Add to dashboard Cite

This paper explores the size effect of zirconia particles on the catalysis of Ni metal for CO2 re-forming of methane. It is revealed for the first time that when the sizes of zirconia particles become samller than 25 nm, the oxide forms nanocomposite catalysts with size-comparable Ni-metal nanocrystals (10−15 nm). The nanocomposite catalysts show extremely stable catalysis, which is in strong contrast with the deactivating Ni catalyst supported on bigger zirconia particles (>25 nm). This raises the possibility of tailoring the catalytic behavior of oxide-supported metal catalysts by reducing the particle size of oxide to make high-performance nanocomposite catalysts.

show abstract

Challenges in CH4 + CO2 Reforming

Cited by 8 publications

References 4 publications

Carbon-free dry reforming of methane to syngas over NdCoO3 perovskite-type mixed metal oxide catalyst

Carbon-free dry reforming of methane to syngas over NdCoO3 perovskite-type mixed metal oxide catalyst

Copper Promoted Cobalt and Nickel Catalysts Supported on Ceria−Alumina Mixed Oxide: Structural Characterization and CO Oxidation Activity

Size Limit of Support Particles in an Oxide-Supported Metal Catalyst: Nanocomposite Ni/ZrO₂ for Utilization of Natural Gas

Contact Info

Product

Resources

About

Challenges in CH4 + CO2 Reforming

Cited by 8 publications

References 4 publications

Carbon-free dry reforming of methane to syngas over NdCoO3 perovskite-type mixed metal oxide catalyst

Carbon-free dry reforming of methane to syngas over NdCoO3 perovskite-type mixed metal oxide catalyst

Copper Promoted Cobalt and Nickel Catalysts Supported on Ceria−Alumina Mixed Oxide: Structural Characterization and CO Oxidation Activity

Size Limit of Support Particles in an Oxide-Supported Metal Catalyst: Nanocomposite Ni/ZrO2 for Utilization of Natural Gas

Contact Info

Product

Resources

About

Size Limit of Support Particles in an Oxide-Supported Metal Catalyst: Nanocomposite Ni/ZrO₂ for Utilization of Natural Gas