Characterization of La-promoted Ni/Al2O3 catalysts for hydrogen production from glycerol dry reforming

Siew, Kah Weng; Lee, Hua Chyn; Gimbun, Jolius; Cheng, Chin Kui

doi:10.1016/s2095-4956(14)60112-1

Cited by 51 publications

(17 citation statements)

References 15 publications

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“…In the light of these points, Rh/ ZrO 2 and Rh/CeO 2 can be envisioned as promising novel catalysts that can be investigated in GDR process. Along these lines, in the current study, we report Rh-based GDR catalysts which outperform the existing Ni-based ones [17][18][19][20][21][22][23][24] in terms of activity and stability. Furthermore, through in-situ/ex-situ spectroscopic/imaging experiments, for the first time in the literature, we provide valuable insights regarding the origins of catalytic activity, stability, aging and sintering in GDR reaction.…”

Section: Introductionmentioning

confidence: 79%

“…GDR has become the focus of experimental studies only recently and the available information in the literature regarding its catalysis is rather scarce. Siew et al [17][18][19][20] studied GDR over La-promoted Ni/ Al 2 O 3 catalysts at temperatures between 650-850°C and CO 2 /G = 0-5. The authors concluded that La promotion (i) provided better metal dispersion (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Dry reforming of glycerol over Rh-based ceria and zirconia catalysts: New insights on catalyst activity and stability

Bulutoglu

Say

Bac

et al. 2018

Applied Catalysis A: General

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Effects of reaction temperature and feed composition on reactant conversion, product distribution and catalytic stability were investigated on syngas production by reforming of glycerol, a renewable waste, with CO 2 on Rh/ ZrO 2 and Rh/CeO 2 catalysts. For the first time in the literature, fresh and spent catalysts were characterized by in-situ FTIR, Raman spectroscopy, transmission electron microscopy and energy dispersive X-ray analysis techniques in order to unravel novel insights regarding the molecular-level origins of catalytic deactivation and aging under the conditions of glycerol dry reforming. Both catalysts revealed increased glycerol conversions with increasing temperature, where the magnitude of response became particularly notable above 650 and 700°C on Rh/ZrO 2 and Rh/CeO 2 , respectively. In accordance with thermodynamic predictions, CO 2 transformation occurred only above 700°C. Syngas was obtained at H 2 /CO ∼0.8, very close to the ideal composition for Fischer-Tropsch synthesis, and carbon formation was minimized with increasing temperature. Glycerol conversion decreased monotonically, whereas, after an initial increase, CO 2 conversion remained constant upon increasing CO 2 /glycerol ratio (CO 2 /G) from 1 to 4. In alignment with the slightly higher specific surface area of and smaller average Rh-particle size on ZrO 2 , Rh/ZrO 2 exhibited higher conversions and syngas yields than that of Rh/CeO 2. Current characterization studies indicated that Rh/CeO 2 revealed strong metal-support interaction, through which CeO 2 seemed to encapsulate Rh nanoparticles and partially suppressed the catalytic activity of Rh sites. However, such interactions also seemed to improve the stability of Rh/CeO 2 , rendering its activity loss to stay below that of Rh/ZrO 2 after 72 h time-on-stream testing at 750°C and for CO 2 /G = 4. Enhanced stability in the presence of CeO 2 was associated with the inhibition of coking of the catalyst surface by the mobile oxygen species and creation of oxygen vacancies on ceria domains. Deactivation of Rh/ZrO 2 was attributed to the sintering of Rh nanoparticles and carbon formation.

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Section: Introductionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Dry reforming of glycerol over Rh-based ceria and zirconia catalysts: New insights on catalyst activity and stability

Bulutoglu

Say

Bac

et al. 2018

Applied Catalysis A: General

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“…To optimize the behavior of Ni based catalyst, La has been incorporated as a promoter for the dry reforming of glycerol [13,48,52,53]. After evaluating the effect of different content of La loaded, it was found that the glycerol conversion decreased in the order of 2%La-Ni/Al2O3 > 3%La-Ni/Al2O3 > 4%La-Ni/Al2O3 > 1%La-Al2O3 > Ni/Al2O3 > 5%La-Ni/Al2O3 > Al2O3.…”

Section: Dry Reforming Of Glycerolmentioning

confidence: 99%

Dry Reforming of Ethanol and Glycerol: Mini-Review

Odriozola

Reina

2019

Catalysts

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Dry reforming of ethanol and glycerol using CO2 are promising technologies for H2 production while mitigating CO2 emission. Current studies mainly focused on steam reforming technology, while dry reforming has been typically less studied. Nevertheless, the urgent problem of CO2 emissions directly linked to global warming has sparked a renewed interest on the catalysis community to pursue dry reforming routes. Indeed, dry reforming represents a straightforward route to utilize CO2 while producing added value products such as syngas or hydrogen. In the absence of catalysts, the direct decomposition for H2 production is less efficient. In this mini-review, ethanol and glycerol dry reforming processes have been discussed including their mechanistic aspects and strategies for catalysts successful design. The effect of support and promoters is addressed for better elucidating the catalytic mechanism of dry reforming of ethanol and glycerol. Activity and stability of state-of-the-art catalysts are comprehensively discussed in this review along with challenges and future opportunities to further develop the dry reforming routes as viable CO2 utilization alternatives.

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“…The amount of Ni was fixed to 7 wt% for meso-NiAl materials investigated in this study. The meso-xLaNiAl catalysts were prepared by impregnating La(NO 3 ) 3 ·6H 2 O on as-prepared mesoNiAl materials, and the lanthanum oxide loadings were 0 wt%, 1.5 wt%, 3 wt%, 6 wt%, and 12 wt%, respectively, (denoted as x = 0, 1.5, 3, 6, 12) [49,50]. In a typical synthetic procedure, approximately 1.0 g of (EO) 20 (PO) 70 (EO) 20 triblock copolymer and an expected stoichiometric amount of Ni(NO 3 ) 2 ·6H 2 O were dissolved in 10.0 mL of anhydrous ethanol with vigorous stirring for at least 5 h for dissolution.…”

Section: Preparation Of Catalystsmentioning

confidence: 99%

Efficient hydrogen production from ethanol steam reforming over La-modified ordered mesoporous Ni-based catalysts

Zeng

Tian

et al. 2016

Applied Catalysis B: Environmental

218

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Characterization of La-promoted Ni/Al2O3 catalysts for hydrogen production from glycerol dry reforming

Cited by 51 publications

References 15 publications

Dry reforming of glycerol over Rh-based ceria and zirconia catalysts: New insights on catalyst activity and stability

Dry reforming of glycerol over Rh-based ceria and zirconia catalysts: New insights on catalyst activity and stability

Dry Reforming of Ethanol and Glycerol: Mini-Review

Efficient hydrogen production from ethanol steam reforming over La-modified ordered mesoporous Ni-based catalysts

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