Synthesis and textural-structural characterization of magnesia, magnesia–titania and magnesia–zirconia catalysts

Aramendía, M. A.; Boráu, V.; Jiménez, César; Marinas, Alberto; Marinas, J. M.; Navı́o, J.A.; Ruíz, José Rafael; Urbano, Francisco J.

doi:10.1016/j.colsurfa.2003.11.026

Cited by 48 publications

(15 citation statements)

References 34 publications

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“…To the best of our knowledge, there is no report of the preparation of MgOZrO 2 by a sol-gel method. There has been one report on the synthesis of a mixed magnesia-zirconia system, using the sol-gel technique, but the XRD results revealed that no new phase was observed, only MgO and ZrO 2 phases [15].…”

Section: Introductionmentioning

confidence: 98%

Preparation of Ni/MgOZrO2 nanocrystals by citrate sol–gel method

Trakarnpruk

Sukkaew

2008

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 98%

Preparation of Ni/MgOZrO2 nanocrystals by citrate sol–gel method

Trakarnpruk

Sukkaew

2008

Journal of Alloys and Compounds

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“…The following method, which we will refer to as precipitation or co-precipitation, was used to prepare pure metal oxide or mixed metal oxide, respectively, based on the work of Aramendia et al [119]. First, 51 g of magnesium nitrate hexahydrate (Acros Organics, 98%) was dissolved in 1 L of deionized water.…”

Section: Precipitation Methodsmentioning

confidence: 99%

“…Mixed oxides of magnesia and titania have also been reported to exhibit enhanced surface basicity compared to pure MgO [111,119]. Therefore, a mixed oxide prepared by precipitation …”

Section: Comparison To a Mixed Oxide Of Ti And Mgmentioning

confidence: 99%

“…The following method, which is based on the work of Aramendia et al [119], was used to prepare pure metal oxide and mixed metal oxide. 98.8%).…”

Section: Rising Ph Precipitationmentioning

confidence: 99%

“…The nature of the mixed oxide catalysts appears to be affected by their synthesis method. Prior studies have utilized samples prepared by sol-gel chemistry, precipitation and impregnation [86,111,[119][120][121][122][123].…”

Section: Introductionmentioning

confidence: 99%

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Carbon-Carbon Bond Forming Reactions Over Metal Oxide Catalysts

Kozlowski¹

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Alcohol coupling, also known as the Guerbet reaction, is a potentially important process to increase the value of short chain alcohols. Metal oxides, metal phosphates and supported transition metals like copper are some examples of heterogeneous catalysts for the reaction.However, the wide variety of catalyst compositions, reaction conditions, and reactor configurations used to study the reaction complicates a direct comparison of various catalysts.Herein, rates over different catalysts will be compared. One existing gap in the current literature is a thorough comparison of the surface acid and base properties of catalysts employed in the Guerbet coupling of alcohols. In this work, various bifunctional materials were synthesized, characterized, and used in Guerbet alcohol coupling and other probe reactions of acid and base catalysts.One well-studied reaction catalyzed by acids and bases is transesterification. Two series of Mg:Zr mixed oxides, prepared by either co-precipitation or sol-gel synthesis, were characterized and evaluated in the base-catalyzed transesterification of tributyrin with methanol.A co-precipitated Mg-rich mixed oxide catalyst with Mg:Zr 11:1 was approximately 300% more active than MgO on a surface area basis, whereas pure ZrO 2 was inactive for the reaction. To explore the nature of the activity enhancement, samples were characterized by X-ray diffraction, N 2 adsorption, CO 2 adsorption microcalorimetry and DRIFTS of adsorbed CO 2 and CH 3 OH.Although the sol-gel synthesis method provided better atomic-level mixing of Mg and Zr, the resulting catalysts were not as effective as mixed oxides prepared by co-precipitation. The most active mixed oxide (Mg:Zr 11:1) exhibited a high initial heat of CO 2 adsorption and modified modes of methanol adsorption compared to MgO. However, the CO 2 adsorption capacity did not correlate to catalyst activity.

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