Effects of ceria in CO2 reforming of methane over Ni/calcium hydroxyapatite

Kim, Ki Hoon; Lee, Sang Yup; Yoon, Ki June

doi:10.1007/bf02706734

Cited by 14 publications

(11 citation statements)

References 21 publications

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“…Ceria-promoted nickel-calcium hydroxyapatite catalysts, which had recently been studied in our laboratory, showed high activity for partial oxidation of methane and propane [4][5][6][7]10]. Since the properties of propane and butane are not quite different, the above catalysts are expected to exhibit similar performance to that for the POX of propane.…”

Section: Introductionmentioning

confidence: 96%

“…Hydrogen is an ideal fuel for various fuel cells because it is clean and more efficient than other fuels such as methanol and thus simplifies the system [4]. Although hydrogen is the ideal fuel for a fuel cell, the use of other fuels such as methane, methanol, ethanol, liquefied petroleum gas (LPG), gasoline and other oil derivatives is also possible via internal or instack reforming [5][6][7]. Among these fuels, liquefied petroleum gas (LPG) is a commercial gas that is easily transported and has a welldeveloped infrastructure.…”

Section: Introductionmentioning

confidence: 99%

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Partial oxidation of n-butane over ceria-promoted nickel/calcium hydroxyapatite

Kwak

Lee

Nam

et al. 2008

Korean J. Chem. Eng.

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LPG has good infrastructure and is anticipated to be used for production of hydrogen, and n-butane which constitutes a main component of LPG for vehicles. Partial oxidation (POX) of n-butane is investigated in this research by employing ceria-promoted Ni/calcium hydroxyapatite catalysts (Ce x Ni 2.5 /Ca 10 (OH) 2 (PO 4 ) 6 x=0.1-0.3) which have recently been reported to exhibit good catalytic performance in POX of methane and propane. The experiments were carried out with changing ceria content, O 2 /n-C 4 H 10 ratio and reaction temperature. As the O 2 /n-C 4 H 10 ratio increased up to 2.75, the n-C 4 H 10 conversion and H 2 yield increased and the selectivity of methane and other hydrocarbons decreased. But with O 2 /n-C 4 H 10 =3.0, the n-C 4 H 10 conversion and H 2 yield decreased. Ce 0.1 Ni 2.5 /Ca 10 (OH) 2 (PO 4 ) 6 showed the highest n-C 4 H 10 conversion and H 2 yield on the whole. In durability tests, higher hydrogen yield and better catalyst stability were obtained with the O 2 /n-C 4 H 10 ratio of 2.75 than with the ratio of 2.5.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Partial oxidation of n-butane over ceria-promoted nickel/calcium hydroxyapatite

Kwak

Lee

Nam

et al. 2008

Korean J. Chem. Eng.

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“…It is well established that ceria and metal oxide (e.g., Gd, Nb, and Zr) doped cerias provide high oxygen storage capacity, which is beneficial in oxidation processes. Several researchers have also reported the benefit of adding or doping this material on the reforming and partial oxidation catalysts in terms of catalyst stability and the resistance toward carbon deposition [10,11]. Focusing on the use of ceria as the sorbent for desulfurization, in laboratory-scaled fixedbed reactor tests, the H 2 S concentration was reduced from 1.2 v% to 3 ppmv at 872 o C and 1 atm by using reduced ceria, CeO n (n< 2).…”

Section: Introductionmentioning

confidence: 99%

High temperature desulfurization over nano-scale high surface area ceria for application in SOFC

Kempegowda

Laosiripojana

Assabumrungrat

2008

Korean J. Chem. Eng.

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In the present work, suitable absorbent material for high temperature desulfurization was investigated in order to apply internally in solid oxide fuel cells (SOFC). It was found that nano-scale high surface area CeO 2 has useful desulfurization activity and enables efficient removal of H 2 S from feed gas between 500 to 850 o C. In this range of temperature, compared to the conventional low surface area CeO 2 , 80-85% of H 2 S was removed by nano-scale high surface area CeO 2 , whereas only 30-32% of H 2 S was removed by conventional low surface area CeO 2 . According to the XRD studies, the product formed after desulfurization over nano-scale high surface area CeO 2 was Ce 2 O 2 S. EDS mapping also suggested the uniform distribution of sulfur on the surface of CeO 2 . Regeneration experiments were then conducted by temperature programmed oxidation (TPO) experiment. Ce 2 O 2 S can be recovered to CeO 2 after exposure in the oxidation condition at temperature above 600 o C. It should be noted that SO 2 is the product from this regeneration process. According to the SEM/EDS and XRD measurements, all Ce 2 O 2 S forming is converted to CeO 2 after oxidative regeneration. As the final step, a deactivation model considering the concentration and temperature dependencies on the desulfurization activity of CeO 2 was applied and the experimental results were fitted in this model for later application in the SOFC model.

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“…of active and stable catalysts that are less sensitive to sintering and exhibit acid-base properties [11][12][13][14][15][16][17][18][19][20][21]. For example, transition metal based catalysts were reported by Ren et al in the reforming of CH 4 .…”

Section: Introductionmentioning

confidence: 99%

Can Ultrasound or pH Influence Pd Distribution on the Surface of HAP to Improve Its Catalytic Properties in the Dry Reforming of Methane?

et al. 2017

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samples were evaluated for their catalytic activity towards dry reforming of methane (DRM) and the reaction was monitored via a thermal conductivity detector, coupled with gas chromatography (GC-TCD). It was found that ultrasound-assisted IE significantly accelerated the process from 3 days to 3 h and with the Pd 0 metal remaining highly distributed upon the HAP with minor changes in catalytic conversions. Moreover, the ultrasound-assisted IW method successfully improved the Pd 0 distribution and catalytic performance. On the other hand, the dispersion of the metal was unaffected after pH treatments in IE with no catalytic improvements observed, in contrast to IW, where considerable increase in metal distribution and subsequently catalytic performance was observed.Abstract The influence of ultrasound and different pH pre-treatments during the metal doping/modification of a hydroxyapatite (HAP) support is investigated. HAP is first synthesised via a hard-template synthetic route using carbon nanorods followed by their full physiochemical characterisation. The HAP was found to be crystalline and comprised a mesoporous structure as observed via XRD and nitrogen adsorption with a BET surface area of 97.57 (±1.16) m 2 g −1. Ultrasound-assisted ion exchange (IE) and incipient wetness impregnation (IW) methodologies were employed to decorate the surface of HAP with Pd 0 and are compared to previous procedures. The influence of pH upon the distribution of Pd 0 throughout the samples during the doping process is also studied. All the prepared Electronic supplementary material The online version of this article

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Effects of ceria in CO2 reforming of methane over Ni/calcium hydroxyapatite

Cited by 14 publications

References 21 publications

Partial oxidation of n-butane over ceria-promoted nickel/calcium hydroxyapatite

Partial oxidation of n-butane over ceria-promoted nickel/calcium hydroxyapatite

High temperature desulfurization over nano-scale high surface area ceria for application in SOFC

Can Ultrasound or pH Influence Pd Distribution on the Surface of HAP to Improve Its Catalytic Properties in the Dry Reforming of Methane?

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