Ni supported high surface area CeO2–ZrO2 catalysts for hydrogen production from ethanol steam reforming

Ebiad, Mohamed A.; El‐Hafiz, Dalia R. Abd; El‐Salamony, Radwa A.; Mohamed, Lamia. S.

doi:10.1039/c2ra20258a

Cited by 78 publications

(38 citation statements)

References 55 publications

(52 reference statements)

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“…Consequently, the Ni/Ce catalyst has the higher porosity, with the values of BET Surface, pore volume, and pore diameter (159.2 m 2 g −1 , 0.312 cm 3 g −1 and 8.2 nm, respectively) lower than the Ce support due to the partial blockage by Ni [28]. The decrease in the support accessibility after impregnation is also observed for the Ni catalysts supported on CeZr and on LaAl, in accordance with the literature [29][30][31]. For Ni/CeZr catalysts, an increase in the Ni content involves a decrease in surface area and pore volume, but the mean pore diameter increases slightly compared to the support due to the blockage of the pores of lower diameter.…”

Section: Introductionsupporting

confidence: 76%

Oxidative Steam Reforming of Raw Bio-Oil over Supported and Bulk Ni Catalysts for Hydrogen Production

et al. 2018

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Several Ni catalysts of supported (on La 2 O 3 -αAl 2 O 3 , CeO 2 , and CeO 2 -ZrO 2 ) or bulk types (Ni-La perovskites and NiAl 2 O 4 spinel) have been tested in the oxidative steam reforming (OSR) of raw bio-oil, and special attention has been paid to the catalysts' regenerability by means of studies on reaction-regeneration cycles. The experimental set-up consists of two units in series, for the separation of pyrolytic lignin in the first step (at 500 • C) and the on line OSR of the remaining oxygenates in a fluidized bed reactor at 700 • C. The spent catalysts have been characterized by N 2 adsorption-desorption, X-ray diffraction and temperature programmed reduction, and temperature programmed oxidation (TPO). The results reveal that among the supported catalysts, the best balance between activity-H 2 selectivity-stability corresponds to Ni/La 2 O 3 -αAl 2 O 3 , due to its smaller Ni 0 particle size. Additionally, it is more selective to H 2 than perovskite catalysts and more stable than both perovskites and the spinel catalyst. However, the activity of the bulk NiAl 2 O 4 spinel catalyst can be completely recovered after regeneration by coke combustion at 850 • C because the spinel structure is completely recovered, which facilitates the dispersion of Ni in the reduction step prior to reaction. Consequently, this catalyst is suitable for the OSR at a higher scale in reaction-regeneration cycles.

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Section: Introductionsupporting

confidence: 76%

Oxidative Steam Reforming of Raw Bio-Oil over Supported and Bulk Ni Catalysts for Hydrogen Production

et al. 2018

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“…The average crystal sizes of the as‐synthesized Cu/CZ and Ni/CZ were 22.6 ±1.9 and 19.9±0.9 nm, respectively. The grains of Ni/CZ catalyst are clearly shown by their transparent irregular opaque shape, which is not homogeneous in nature with a dual distribution having mean sizes of 42.9±0.4 and 60.3±0.9 nm, respectively . HR‐TEM images along with the SAED (Figures c and 6 f insects), demonstrates polycrystalline nature of the Cu/CZ and Ni/CZ catalysts.…”

Section: Resultsmentioning

confidence: 95%

Design of Efficient Noble Metal Free Copper‐Promoted Nickel‐Ceria‐Zirconia Nanocatalyst for Bio‐Fuel Upgrading

et al. 2018

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A new series of noble metal free bimetallic Cu−Ni supported ceria‐zirconia catalysts (Cu−Ni/CZ) has been developed with various Cu/Ni ratios by a simple co‐precipitation/impregnation method. Aqueous‐phase hydrodeoxygenation (HDO) of vanillin a typical compound of lignin‐derived bio‐oil, in promoting biomass refining was carried out to investigate catalytic performances under 25 bar of H2 pressure at 160oC. All the as‐synthesized catalysts were thoroughly characterised employing powder XRD, Raman spectroscopy, H2‐TPR, HR‐TEM, HAADF‐STEM, EDS Mapping, and XPS. It was found that 15 wt% Cu on Ni/CZ (Cu−Ni/CZ−B) nanocomposite enhanced activity significantly in comparison with other bimetallic or monometallic catalysts, exhibiting ∼98% of vanillin conversion and ∼94% of selectivity toward 2‐methoxy‐4‐methylphenol as a desired product. The Cu−Ni/CZ−B catalyst shows ∼4‐fold increase in activity compared with Cu−Ni/CeO2 and Cu−Ni/ZrO2, the mono oxide supported counterparts. The superior catalytic performance with improved stability were explained by synergistic effects at the interfaces of each species, in which electron interactions between Ni, Cu, and ceria‐zirconia support generated novel active sites. XRD and HR‐TEM revealed that Cu−Ni bimetallic phases were created on the ceria‐zirconia, which were responsible for enhancement of catalytic performance with no significant drop in catalytic activity with desired product selectivity for eleven successive catalytic cycles demonstrating the excellent stability and reproducibility of this catalyst system.

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“…Whatever, at reaction temperature higher than 500 o C, all catalysts give 100% ethanol conversion. So, by comparing the catalytic activity of the three catalysts with the catalysts reported in our previous work [5,6], and with those catalysts reported in the literature as the most effective catalysts in ESR reactions like Ni/Ce 0.74 Zr 0.26 O 2 [27][28][29][30], over which C 2 H 5 OH conversion reached about 97% with Ni loading of 30 wt% at 600 o C. We can be concluded that, Co 10 /Ce-La catalyst is an excellent catalyst for ESR reaction. In all the cases the main products are H 2 , CO, CO 2 and CH 4 in addition to small amount of ethylene, acetone and acetaldehyde.…”

Section: Catalytic Activitymentioning

confidence: 99%

“…Nowadays, the only method for hydrogen is natural gas, steam reforming and naphtha, for its use in refineries for clean fuel production along with its use in ammonia production [3,4]. Significant research is underway to produce hydrogen from biorenewable feedstock [5,6].…”

mentioning

confidence: 99%

A study to develop nano-spray freeze dried Co/Ce–La catalyst for the production of hydrogen from bio-renewable feedstock

El‐Hafiz

Ebiad

2015

Journal of Natural Gas Science and Engineering

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Ni supported high surface area CeO2–ZrO2 catalysts for hydrogen production from ethanol steam reforming

Cited by 78 publications

References 55 publications

Oxidative Steam Reforming of Raw Bio-Oil over Supported and Bulk Ni Catalysts for Hydrogen Production

Oxidative Steam Reforming of Raw Bio-Oil over Supported and Bulk Ni Catalysts for Hydrogen Production

Design of Efficient Noble Metal Free Copper‐Promoted Nickel‐Ceria‐Zirconia Nanocatalyst for Bio‐Fuel Upgrading

A study to develop nano-spray freeze dried Co/Ce–La catalyst for the production of hydrogen from bio-renewable feedstock

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