Nanosized iron and nickel oxide zirconia supported catalysts for benzylation of benzene: Role of metal oxide support interaction

Ali, Tarek T.; Narasimharao, Katabathini; Ahmed, Nesreen S.; Basahel, Sulaiman N.; Al-Thabaiti, Shaeel A.; Mokhtar, Mohamed

doi:10.1016/j.apcata.2014.08.012

Cited by 19 publications

(11 citation statements)

References 56 publications

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Section: Resultssupporting

confidence: 65%

“…This is most probably due to deposition of Cu species inside the mesopores of ZrO2 support. A very similar behavior was observed in case Fe2O3 supported mesoporous ZrO2 catalysts [20]. The acidic properties of bare ZrO2 and porous CuO-ZrO2 samples were evaluated using FTIR spectroscopy following pyridine adsorption and NH3-TPD techniques.…”

Section: Resultsmentioning

confidence: 85%

“…In a recent publication [20], we synthesized mesoporous iron and nickel oxide supported ZrO 2 by a simple co-precipitation method. Formation of highly dispersed Fe 3+ -ZrO 2 interactive species were observed in case of 20 wt.…”

Section: Introductionmentioning

confidence: 99%

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Physico-Chemical and Catalytic Properties of Mesoporous CuO-ZrO2 Catalysts

et al. 2016

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Mesoporous CuO-ZrO 2 catalysts were prepared and calcined at 500˝C. The performance of the synthesized catalysts for benzylation of benzene using benzyl chloride was studied. The bare support (macroporous ZrO 2 ) offered 45% benzyl chloride conversion after reaction time of 10 h at 75˝C. Significant increase in benzyl chloride conversion (98%) was observed after CuO loading (10 wt. %) on porous ZrO 2 support. The conversion was decreased to 80% with increase of CuO loading to 20 wt. %. Different characterization techniques (XRD, Raman, diffuse reflectance UV-vis, N 2 -physisorption, H 2 -TPR, XPS and acidity measurements) were used to evaluate physico-chemical properties of CuO-ZrO 2 catalysts; the results showed that the surface and structural characteristics of the ZrO 2 phase as well as the interaction between CuO-ZrO 2 species depend strongly on the CuO content. The results also indicated that ZrO 2 support was comprised of monoclinic and tetragonal phases with macropores. An increase of the volume of monoclinic ZrO 2 phase was observed after impregnation of 10 wt. % of CuO; however, stabilization of tetragonal ZrO 2 phase was noticed after loading of 20 wt. % CuO. The presence of low-angle XRD peaks indicates that mesoscopic order is preserved in the calcined CuO-ZrO 2 catalysts. XRD reflections due to CuO phase were not observed in case of 10 wt. % CuO supported ZrO 2 sample; in contrast, the presence of crystalline CuO phase was observed in 20 wt. % CuO supported ZrO 2 sample. The mesoporous 10 wt. % CuO supported ZrO 2 catalyst showed stable catalytic activity for several reaction cycles. The observed high catalytic activity of this catalyst could be attributed to the presence of a higher number of dispersed interactive CuO (Cu 2+ -O-Zr 4+ ) species, easy reducibility, and greater degree of accessible surface Lewis acid sites.

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Section: Resultssupporting

confidence: 65%

Section: Resultsmentioning

confidence: 85%

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Physico-Chemical and Catalytic Properties of Mesoporous CuO-ZrO2 Catalysts

et al. 2016

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“…All the samples showed the peak at 181.9 eV for Zr 3d 5/2 component. It is known that the pure ZrO 2 shows a peak at 182.3 eV for Zr 3d 5/2 component [36]. The change in coordination number of Zr atoms in tetragonal or cubic ZrO 2 can be confirmed by the change in the measured binding energies of Zr 3d 5/2 core levels.…”

Section: X-ray Photoelectron Spectroscopymentioning

confidence: 82%

Effect of preparation conditions on structural and catalytic properties of lithium zirconate

Narasimharao

Ali

2016

Ceramics International

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“…This point confirms that crystalline zirconium oxide is not present, not even in the sample with a higher amount of Zr, in agreement with XRD results. Differently, at increasing Ce content in the samples, the characteristic band at 462 cm −1 of cerium oxide with fluorite-type structure appears with higher intensity in the spectra, along with two additional bands at 225 and 635 cm −1 , directly related to the CeO2 lattice defects caused by oxygen vacancies and the modification of the oxygen sub-lattice [13,25,[26][27][28][29][30][31].…”

Section: Characterization Of Active Sitesmentioning

confidence: 99%

Novel Ni-Ce-Zr/Al2O3 Cellular Structure for the Oxidative Dehydrogenation of Ethane

et al. 2017

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A novel γ-alumina-supported Ni-Ce-Zr catalyst with cellular structure was developed for oxidative dehydrogenation of ethane (ODHE). First, powdered samples were synthesized to study the effect of both the total metal content and the Ce/Zr ratio on the physicochemical properties and performance of these catalysts. All synthesized powdered samples were highly active and selective for ODHE with a maximum ethylene productivity of 6.94 µmol ethylene g act cat −1 s −1 . According to the results, cerium addition increased the most reducible nickel species population, which would benefit ethane conversion, whereas zirconium incorporation would enhance ethylene selectivity through the generation of higher amounts of the least reducible nickel species. Therefore, the modification of active site properties by addition of both promoters synergistically increases the productivity of the Ni-based catalysts. The most efficient formulation, in terms of ethylene productivity per active phase amount, contained 15 wt% of the mixed oxide with Ni 0.85 Ce 0.075 Zr 0.075 composition. This formulation was selected to synthesize a Ni-Ce-Zr/Al 2 O 3 structured body by deposition of the active phase onto a homemade γ-alumina monolith. The structured support was manufactured by extrusion of boehmite-containing dough. The main properties of the Ni 0.85 Ce 0.075 Zr 0.075 powder were successfully preserved after the shaping procedure. In addition, the catalytic performance of the monolithic sample was comparable in terms of ethylene productivity to that of the powdered counterpart.

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Nanosized iron and nickel oxide zirconia supported catalysts for benzylation of benzene: Role of metal oxide support interaction

Cited by 19 publications

References 56 publications

Physico-Chemical and Catalytic Properties of Mesoporous CuO-ZrO2 Catalysts

Physico-Chemical and Catalytic Properties of Mesoporous CuO-ZrO2 Catalysts

Effect of preparation conditions on structural and catalytic properties of lithium zirconate

Novel Ni-Ce-Zr/Al2O3 Cellular Structure for the Oxidative Dehydrogenation of Ethane

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