Effects of preparation methods on properties of Ni/CeO2–Al2O3 catalysts for methane reforming with carbon dioxide

Chen, Jixiang; Wang, Rijie; Zhang, Jiyan; He, Fei; Han, Shuhua

doi:10.1016/j.molcata.2005.04.023

Cited by 97 publications

(37 citation statements)

References 30 publications

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“…For all studied catalysts, N 2 adsorption-desorption isotherms are typically type IV isotherms showing a hysteresis loop associated with the presence of mesoporous structure [16,17]. The total surface area (S tot ), pore volume (V p ) and pore size (Table 1) are not significantly affected by the addition of the second metal or rare earth oxide to the Ni/Al 2 O 3 catalyst.…”

Section: Catalysts Characterizationmentioning

confidence: 93%

“…The mixed supports containing CeO 2 (6 wt%) and La 2 O 3 (6 wt%) were prepared by the impregnation of c-alumina with aqueous solutions of Ce(NO 3 ) 3 , and La(NO 3 ) 3 , respectively, followed by calcination in argon at 550°C for 4 h. Nickel (7 wt%) was then added by the wet impregnation of mixed supports, as described above [17]. All reagents were purchased from Alpha-Aesar (Germany) and used with no further purification.…”

Section: Catalysts Preparationmentioning

confidence: 99%

“…The addition of cerium oxide and lanthanum oxide to alumina supported noble metal catalysts (Pt and Pd) was reported to improve the catalyst stability for MSR [14,15]. For Ni catalysts, the promoting effect of cerium oxide was studied mostly for dry reforming of methane [16][17][18], but some studies on MSR were also performed with encouraging results [19,20]. Ce 3?…”

Section: Introductionmentioning

confidence: 99%

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Supported nickel catalysts for low temperature methane steam reforming: comparison between metal additives and support modification

Dan

Miheţ

Biriş

et al. 2011

Reac Kinet Mech Cat

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The effect of Ag (1 wt%) and Au (1 wt%) on the catalytic properties of Ni/Al 2 O 3 (7 wt% Ni) for methane steam reforming (MSR) was studied in parallel with the effect of CeO 2 (6 wt%) and La 2 O 3 (6 wt%) addition. The addition of 1 wt% Ag to the alumina supported nickel catalyst drastically decreased its catalytic properties at temperatures lower than 600°C, due to the blockage of metal catalytic centers by silver deposition. The addition of Au and CeO 2 (La 2 O 3 ) to the nickel catalyst improved the methane conversion, CO 2 selectivity and hydrogen production at low reaction temperatures (t \ 600°C). At 700°C under our working conditions, the additives have no important effect in hydrogen production by MSR. The best hydrogen production at low temperatures was obtained for Ni-Au/Al 2 O 3 , due to the higher CO 2 selectivity, cumulated with slightly higher methane conversion in comparison with Ni/CeO 2 -Al 2 O 3 . At high temperature, Ni/CeO 2 -Al 2 O 3 is stable for 48 h on stream. are mainly deactivated due to the temperature effect on Au and Ag nanoparticles and less through coke formation. On , crystalline, graphitic carbon was deposited after 48 h of reaction leading to catalyst partial deactivation. On the Ni/CeO 2 -Al 2 O 3 surface, a porous amorphous form of deposited carbon was found, which does not decrease its catalytic activity after 48 h of reaction.Electronic supplementary material The online version of this article (

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Section: Catalysts Characterizationmentioning

confidence: 93%

Section: Catalysts Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Supported nickel catalysts for low temperature methane steam reforming: comparison between metal additives and support modification

Dan

Miheţ

Biriş

et al. 2011

Reac Kinet Mech Cat

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“…The carbon deposition during the reforming of methane was suggested to be due to either methane decomposition (1) or carbon monoxide disproportionation (2) [14,23,26]:…”

Section: Catalysts Characterizationmentioning

confidence: 99%

“…Some researchers have greatly enhanced the catalytic activity and stability of Ni catalysts by using different supports [7][8][9][10][11][12]. The effects of supports on the coke formation and stability of Ni-based catalysts were also extensively investigated [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Performance of Monolithic Foam Ni/SiC Catalyst in Carbon dioxide Reforming of Methane to Synthesis Gas

Liu

Zhang

et al. 2007

Catal Lett

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Carbon dioxide reforming of methane to synthesis gas has been investigated with Ni catalysts supported on monolithic foam SiC, which were prepared by the initial wetness impregnation method. The catalyst of 7 wt%Ni/ SiC was verified to be the best one in different Ni content catalysts. Compared with other catalysts such as 7 wt%Ni/ SiO 2 and 7 wt%Ni/Al 2 O 3 , the 7 wt%Ni/SiC catalyst exhibited not only the highest activity but also remarkable stability and excellent coke resistance during 100 h reaction. Furthermore, the conversion of CO 2 and CH 4 remained at about 96% and 94%, respectively in 100 h reaction time. The structure and properties of the catalysts were characterized by BET, XRD, H 2 -TPR, XPS and TEM techniques.

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One‐pot Synthesis of Ordered Mesoporous NiCeAl Oxide Catalysts and a Study of Their Performance in Methane Dry Reforming

Wang

Deng

et al. 2014

ChemCatChem

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Ordered mesoporous NiAl and NiCeAl catalysts with different Ce/Al molar ratios were facilely synthesized by using the improved evaporation‐induced self‐assembly method. The characterization results confirmed that the ordered mesoporous structure was well sustained in the Ce‐incorporated NiAl materials (Ce/Al molar ratio<4 %). Compared with NiAl mesoporous materials, Ce‐incorporated mesoporous materials demonstrated higher specific surface areas, larger pore volumes, and more uniform pore sizes. The catalytic test conducted by using methane dry reforming revealed that compared with NiAl catalysts, all the Ce‐promoted catalysts demonstrated improved initial catalytic activity, which was due to the high dispersion and the high reduction degree of active Ni species in NiCeAl catalysts. The stable alumina framework, confinement effect of ordered mesopores, and high oxygen mobility contributed to the improved catalytic stability of NiCeAl catalysts. For comparison, the mesoporous NiCeAl catalyst (denoted as NiCeAl‐IMP) was also prepared by using the conventional impregnation method. The agglomeration of Ni particles was observed during the stability test for the Ni‐impregnated catalyst, which accelerated the rate of carbon deposition. The NiCeAl catalyst (Ce/Al molar ratio=1 %) demonstrated excellent resistance to the formation of graphitic carbon species owing to the redox property, while a large amount of graphitic carbon species was deposited over the NiAl sample, which was responsible for deactivation.

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Effects of preparation methods on properties of Ni/CeO2–Al2O3 catalysts for methane reforming with carbon dioxide

Cited by 97 publications

References 30 publications

Supported nickel catalysts for low temperature methane steam reforming: comparison between metal additives and support modification

Supported nickel catalysts for low temperature methane steam reforming: comparison between metal additives and support modification

Catalytic Performance of Monolithic Foam Ni/SiC Catalyst in Carbon dioxide Reforming of Methane to Synthesis Gas

One‐pot Synthesis of Ordered Mesoporous NiCeAl Oxide Catalysts and a Study of Their Performance in Methane Dry Reforming

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