Citrate-mediated sol–gel synthesis of Al-substituted sulfated zirconia catalysts for α-pinene isomerization

Rabee, Abdallah I.M.; Durndell, Lee J.; Fouad, Nasr E.; Frattini, Lucia; Isaacs, Mark A.; Lee, Adam F.; Mekhemer, Gamal A. H.; Santos, Vannia Cristina dos; Wilson, Karen; Zaki, Mohamed I.

doi:10.1016/j.mcat.2017.10.029

Cited by 11 publications

(9 citation statements)

References 46 publications

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“…Figure 1a shows XRD patterns for pure zirconia (ZrO 2 -HD) and xMZ-HD mixed oxide materials prepared by impregnation, where x is the MgO mass loading. ZrO 2 -HD exhibited reflections corresponding to predominantly monoclinic (m-) ZrO 2 (JCPDS 86-1451 [33]), a minority tetragonal (t-) ZrO 2 phase (JCPDS 88-1007 [34]). In contrast, xMZ-HD only contained t-ZrO 2 crystallites for all MgO loadings (x = 2.1-18.2 wt %).…”

Section: Structure and Compositionmentioning

confidence: 99%

“…A second family of mixed oxide samples were prepared via citrate-mediated sol-gel processing with nominal MgO contents in the range 3-15 wt % according to methods found in the literature [33,45]. Appropriate quantities of zirconium oxychloride (ZrOCl 2 ·9H 2 O; 99% Research-Lab Fine Chem Industries 0161600100) and magnesium nitrate (Mg(NO 3 ) 2 ·6H 2 O; 98% Aldrich 237175) were dissolved in 100 mL of deionized water.…”

Section: Citrate-mediated Sol-gelmentioning

confidence: 99%

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On the Impact of the Preparation Method on the Surface Basicity of Mg–Zr Mixed Oxide Catalysts for Tributyrin Transesterification

et al. 2018

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Mixed metal oxides are promising heterogeneous catalysts for biofuel production from lipids via alcoholysis, however, the impact of solid acidity and/or basicity on reactivity is comparatively poorly understood. Two systematically related families of MgO-ZrO 2 mixed oxide catalysts were therefore prepared by different synthetic routes to elucidate the impact of surface acid-base properties on catalytic performance in the transesterification of tributyrin with methanol. The resulting materials were characterized by TGA-MS, ICP-OES, N 2 porosimetry, XRD, TEM, XPS, DRIFTS, and CO 2 -temperature-programmed desorption (TPD). MgO-ZrO 2 catalysts prepared by both non-aqueous impregnation and citric acid-mediated sol-gel routes exhibit excellent activity and stability. The citrate routes favor highly dispersed MgO and concomitant Lewis acid-base pair formation at the interface with zirconia. However, for both the citrate and impregnation routes, tributyrin transesterification occurs over a common, strongly basic MgO active site.

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Section: Structure and Compositionmentioning

confidence: 99%

Section: Citrate-mediated Sol-gelmentioning

confidence: 99%

On the Impact of the Preparation Method on the Surface Basicity of Mg–Zr Mixed Oxide Catalysts for Tributyrin Transesterification

et al. 2018

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“…The low magnesium content of the as-prepared catalyst may also reflect the low pH used during its synthesis. The total sulfur content determined by TEM-EDS, CHNS-O, and ICP-MS was approximately 7 wt% (Table 1), higher than that reported for SO4/MOx (2-3 wt%)[54] and Al-doped SO4/ZrO2 (1.5 wt%)[55], but comparable to SO4/Fe-Al-TiO2[5].…”

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confidence: 56%

A core-shell SO4/Mg-Al-Fe3O4 catalyst for biodiesel production

Gardy

Nourafkan

Osatiashtiani

et al. 2019

Applied Catalysis B: Environmental

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…Subsequent sulphated treatment produced thermally stable isolated sulphate species resulting in the superior acidity for αpinene oxide isomerization. 134 Apart from the surface functionalization of metal oxide, the acidity was also enhanced via combination of two metal oxides. For example, WO x /TiO 2 , 135 ZrO 2 /SiO 2 136 and B 2 O 3 /SiO 2 33 showed the increase of acidity for the formation of desired product from the isomerization of α-pinene.…”

Section: Me Tal Oxide C Atalys Tsmentioning

confidence: 99%

Review on heterogeneous catalysts for the synthesis of perfumery chemicals via isomerization, acetalization and hydrogenation

Hartati

Firda

Bahruji

et al. 2021

Flavour & Fragrance J

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Synthetic fragrance has dominated the perfumery industry in recent decades due to the ability to produce perfumery ingredients on a large scale at a low cost. Extensive research in the field of synthetic perfumery chemical involved the utilization of catalysts to improve the productivity. This review will discuss recent advances of heterogeneous catalysts for the synthesis of perfumery chemicals as fragrance ingredients. Transition from homogeneous to heterogeneous catalysts will be included in order to provide insight into the benefits of heterogeneous catalysts to overcome the limitation of homogeneous reaction. Isomerization, acetalization and hydrogenation were identified as three main reactions for the synthesis of perfumery chemicals based on the number of reported work since 2000. This review will focus on α‐pinene and α‐pinene oxide as the main molecular substrates, however, different molecules, for example, linalool, citronellal and cinnamaldehyde will also be included. The synthesis, modification and possible mechanisms for the reactions involving zeolite, aluminosilicate, metal oxides, metal organic framework, monometallic and bimetallic nanoparticles as heterogeneous catalysts will be discussed. Discussion on isomerization and acetalization reactions will focus on the acidity and the porosity of the catalysts as the two main factors that determine the conversion and selectivity. For perfumery chemicals produced via hydrogenation reaction, the role of monometallic and bimetallic nanoparticles catalysts will be discussed in the chemoselective reduction of cinnamaldehyde and citronellal.

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Citrate-mediated sol–gel synthesis of Al-substituted sulfated zirconia catalysts for α-pinene isomerization

Cited by 11 publications

References 46 publications

On the Impact of the Preparation Method on the Surface Basicity of Mg–Zr Mixed Oxide Catalysts for Tributyrin Transesterification

On the Impact of the Preparation Method on the Surface Basicity of Mg–Zr Mixed Oxide Catalysts for Tributyrin Transesterification

A core-shell SO4/Mg-Al-Fe3O4 catalyst for biodiesel production

Review on heterogeneous catalysts for the synthesis of perfumery chemicals via isomerization, acetalization and hydrogenation

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