Reactivity of Aluminum Spinels in the Ethanol Steam Reforming Reaction

Barroso, Mariana N.; Gómez, Manuel F.; Arrúa, Luis A.; Abello, M. Cristina

doi:10.1007/s10562-006-0051-9

Cited by 45 publications

(23 citation statements)

References 30 publications

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“…For instance, Zhang et al [16] reported that ceria supported Co, Ir and Ni catalysts were active and selective to hydrogen in the temperature range from 300 to 7001C. Similarly, oxide supported bimetallic catalysts, aluminum spinels and also some commercially available catalysts were found to be active and selective to hydrogen at high temperatures for the bio-ethanol steam reforming [17][18][19]. Among the catalysts studied up until now, ZnO based catalysts seem to be promising.…”

Section: Article In Pressmentioning

confidence: 99%

The catalytic reforming of bio-ethanol over SiO2 supported ZnO catalysts: The role of ZnO loading and the steam reforming of acetaldehyde

Şeker

2008

International Journal of Hydrogen Energy

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t r a c tIn this study, the activity and the product distributions of sol-gel made SiO 2 supported ZnO catalysts in the steam reforming of ethanol and acetaldehyde is presented as a function of ZnO loading and temperature. We show that although highly dispersed ZnO in SiO 2 (upto 50% ZnO loading) can be prepared using a single step sol-gel method, a precise control of crystallite size could not be achieved. From CO 2 TPD measurements, we found that the basic site densities of ZnO/SiO 2 catalysts stays o0:05 mmol=m 2 and do not increase linearly with ZnO loading. The highest basic site density among the catalysts occurs on pure ZnO.All ZnO/SiO 2 catalysts are active at 350 1C whereas pure ZnO catalyst is active at 450 1C.Iso-conversion activity tests show that ethanol steam reforming activities of the catalysts seem to be dependent on the ZnO crystallite size rather than the basic site density of the catalysts when the surface coverage of the basic site density is o0:32% but acetone is not formed only on catalysts with ZnO crystallite size o5 nm regardless of their basic site densities. Interestingly, we found that ethanol was mostly dehydrogenated to acetaldehyde and hydrogen although H 2 O/C 2 H 5 OH molar ratio in the feed was 12. CO was not also produced in the steam reforming of ethanol over all the catalysts. Acetone and propene are produced from acetaldehyde as observed in the steam reforming of acetaldehyde. The steam reforming of acetaldehyde as compared to its decomposition was found to be more favorable over the catalysts with small ZnO crystals, such as 30% and 50% ZnO catalysts.

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Section: Article In Pressmentioning

confidence: 99%

The catalytic reforming of bio-ethanol over SiO2 supported ZnO catalysts: The role of ZnO loading and the steam reforming of acetaldehyde

Şeker

2008

International Journal of Hydrogen Energy

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“…3(1)], one single reduction peak starts at 660°C and reaches a peak value at 782°C; a weak and broad peak can merely be identified at 398°C. The peaks near 350°C can be attributed to the reduction of nickel oxides, while those beyond 700°C can be attributed to nickel aluminum spinel NiAl 2 O 4 [7]. The TPR results suggest that most of the nickel exists in a nickel aluminum spinel phase, while little exists as nickel oxide.…”

Section: Characterizationsmentioning

confidence: 90%

“…show good performance in ATR of ethanol, comparable results are also observed on the non-precious metal catalysts, such as nickel-based catalysts, especially for their capacity at higher temperatures. The activity in SR and/or ATR of ethanol over Ni-based catalysts has been extensively studied [6][7][8][9]. Because of its high surface area and interactions between metal and support, gamma alumina is typically used to support Ni-based catalysts for SR or ATR of ethanol.…”

Section: Introductionmentioning

confidence: 99%

Fe Promoted Ni–Ce/Al2O3 in Auto-Thermal Reforming of Ethanol for Hydrogen Production

et al. 2009

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Ni-Ce/Al 2 O 3 and Ni-Ce-Fe/Al 2 O 3 catalysts prepared by impregnation were tested in auto-thermal reforming (ATR) of ethanol. With ceria promotion, conversion of ethanol near 100% and selectivity to hydrogen at 103.6% can be achieved at 600°C in ATR of ethanol, while with both iron and ceria promotion, selectivity to hydrogen at 118.4% is observed, which are higher (57.17% improvement on hydrogen selectivity) than that of the conventional Ni catalyst. In addition, higher stability is also observed during a 31-h test. The improvements are attributed to the restrained acidity and high dispersion of nickel alumina spinel phase.

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“…Figure 1a and 1b shows XRD patterns of as-prepared and reduced Co 1 [16]) are stable in the reaction conditions of ethanol steam reforming. Other spinels containing transition metals (Fe, Co, Ni, Cu) are usually reduced into the mixture of metals and oxides [14][15][16]. Metallic Mn is not observed in Mn-containing spinels, since Mn oxides can be reduced only to MnO in such conditions.…”

Section: Xrd Studymentioning

confidence: 99%

Mixed spinel-type Ni-Co-Mn oxides: synthesis, structure and catalytic properties

Sadovskaya¹,

Frolov²,

Goncharov³

et al. 2016

Catalysis for Sustainable Energy

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to be the most efficient fuel in terms of the highest energy/ mass ratio among hydrocarbon fuels. Also, hydrogen fuel cells are environmental friendly since they do not emit CO 2 into atmosphere. Catalysts with different types of both active components and supports were studied in ESR reaction. [17][18][19][20] were also studied. Such studies aim at replacing currently used noble and rare-earth metals containing catalysts by the cheaper and accessible ones. All the works mentioned note that at contact time ~ 0.1 s spinels provide 100% ethanol conversion at temperatures exceeding 600°C. In the present paper mixed spinel-type oxides Co mixed oxides were prepared by the thermal decomposition of mixed nitrate salts by the following route: 1) heating from room temperature to 120°C in 1 hour, 2) annealing at 120°C for 1 hour, 3) heating from 120°C to 320°C in 1 hour, 4) annealing at 320°C for 1 hour, 5) heating from 320°C to 720°C in 2 hours, and 6) annealing at 720°C for 1 hour.

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Reactivity of Aluminum Spinels in the Ethanol Steam Reforming Reaction

Cited by 45 publications

References 30 publications

The catalytic reforming of bio-ethanol over SiO2 supported ZnO catalysts: The role of ZnO loading and the steam reforming of acetaldehyde

The catalytic reforming of bio-ethanol over SiO2 supported ZnO catalysts: The role of ZnO loading and the steam reforming of acetaldehyde

Fe Promoted Ni–Ce/Al2O3 in Auto-Thermal Reforming of Ethanol for Hydrogen Production

Mixed spinel-type Ni-Co-Mn oxides: synthesis, structure and catalytic properties

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