Interactions in Alumina-Based Iron Oxide-Vanadium Oxide Catalysts under High Temperature Calcination and SO2 Oxidation Conditions

Clark, Fred T.; Springman, M. C.; Willcox, David; Wachs, Israel E.

doi:10.1006/jcat.1993.1001

Cited by 14 publications

(5 citation statements)

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“…From the XRD results, N 2 O formation seemed to occur especially on well-ordered cerium oxide crystalline planes. A similar conclusion has been drawn for crystalline chromia [26], crystalline manganese oxide [27], and crystalline [28] and polymeric vanadia species [29].…”

Section: Effect Of Ce Loadingsupporting

confidence: 77%

The activity and characterization of CeO2-TiO2 catalysts prepared by the sol–gel method for selective catalytic reduction of NO with NH3

Gao

Jiang

Zhong

et al. 2010

Journal of Hazardous Materials

423

145

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Section: Effect Of Ce Loadingsupporting

confidence: 77%

The activity and characterization of CeO2-TiO2 catalysts prepared by the sol–gel method for selective catalytic reduction of NO with NH3

Gao

Jiang

Zhong

et al. 2010

Journal of Hazardous Materials

423

145

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“…The concentration of Fe 3+ detected decreased as the penetration depth increased, indicating that the Fe 3+ resided on the surface of the MgO . Mössbauer spectra were also consistent with the presence of highly dispersed Fe 2 O 3 . , …”

Section: Results and Discussion: Nanocrystals As Chemical Reagentsmentioning

confidence: 52%

“…33 Mo ¨ssbauer spectra were also consistent with the presence of highly dispersed Fe 2 O 3 . 33,53 For comparison, a more homogeneous mixture of iron and magnesium oxides was prepared by a modified aerogel procedure. Solutions of Mg(OCH 3 ) 2 and Fe(acac) 3 were mixed and allowed to react.…”

Section: Results and Discussion: Nanocrystals As Chemical Reagentsmentioning

confidence: 99%

Nanocrystals as Stoichiometric Reagents with Unique Surface Chemistry

et al. 1996

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Nanocrystals of MgO and CaO have been prepared by a modified aerogel/hypercritical drying/dehydration method. For nanocrystalline MgO (AP-MgO) surface areas ranged from 250 to 500 m 2 /g, whereas for AP-CaO 100-160 m 2 /g. These materials have been compared with more conventional (CP) microcrystalline samples of lower surface area with regard to (1) morphology (AP-samples (autoclave preparation) are tiny polyhedral crystallites, while CP-samples (conventional preparation) are larger, hexagonal platelets and cubes);(2) residual surface OH (AP-samples have less acidic OH, which are more isolated from each other; (3) acid gas adsorption (AP-samples adsorb more SO 2 and CO 2 at low pressures and room temperature and prefer monodentate rather than bidentate adsorption modes, but at higher pressures CP-samples adsorb more SO 2 and HCl apparently due to the formation of more well ordered multilayers); (4) destructive adsorption of organophosphorus compounds and chlorocarbons (AP-samples are superior due to higher surface areas and higher surface reactivities), and (5) very thin layers of transition metal oxides on the MgO and CaO nanocrystals that significantly enhance destructive adsorption capacities to the point where [M x O y ]AP-MgO and [M x O y ]-AP-CaO become stoichiometric in reaction with CCl 4 . The data are conclusive that the nanocrystals are more reactive than the microcrystals, and this is mainly attributed to morphological differences, including defects. However, intrinsic electronic effects due purely to "smallness" cannot be ruled out.

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“…Since similar catalysts regenerated at 500 °C have AMSO-Os present as shown by XRD Clark et al (1991), this high-temperature SO2 peak could be due to thermal decomposition of the sulfate. Even though handbooks give 770 °C as the value for thermal decomposition of AMSO-Js, high levels of V2O5 present on the catalyst promote the decomposition of Al2(S04)3 at lower temperatures (Clark et al, 1993). However, at low Ni+V levels, the high-temperature peak is due to organic sulfur as previously discussed by .…”

Section: Methodsmentioning

confidence: 96%

Characterization and Deactivation Studies of Spent Resid Catalyst from Ebullating Bed Service

Zeuthen¹,

Cooper²,

Clark³

et al. 1995

Ind. Eng. Chem. Res.

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Interactions in Alumina-Based Iron Oxide-Vanadium Oxide Catalysts under High Temperature Calcination and SO2 Oxidation Conditions

Cited by 14 publications

References 0 publications

The activity and characterization of CeO2-TiO2 catalysts prepared by the sol–gel method for selective catalytic reduction of NO with NH3

The activity and characterization of CeO2-TiO2 catalysts prepared by the sol–gel method for selective catalytic reduction of NO with NH3

Nanocrystals as Stoichiometric Reagents with Unique Surface Chemistry

Characterization and Deactivation Studies of Spent Resid Catalyst from Ebullating Bed Service

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