Pt/H-beta zeolites as productive bifunctional catalysts for the one-step citronellal-to-menthol conversion

Mertens, Pascal; Verpoort, Francis; Parvulescu, Andrei‐Nicolae; Vos, Dirk De

doi:10.1016/j.jcat.2006.06.017

Cited by 42 publications

(35 citation statements)

References 10 publications

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“…[17,18] Recently, the application of catalytic amounts of zeolites and mesoporous materials as catalysts for this reaction has attracted considerable attention. [19][20][21][22][23][24][25][26][27] Since the discovery of MCM-41 mesoporous materials, [28] there has been tremendous development in the synthesis and modification of the silica framework. By virtue of their relatively large pores, mesoporous materials overcome the size and diffusion limitations that the microporous zeolites have.…”

Section: Introductionmentioning

confidence: 99%

Zr‐TUD‐1: A Lewis Acidic, Three‐Dimensional, Mesoporous, Zirconium‐Containing Catalyst

Ramanathan

Villalobos

Kwakernaak

et al. 2008

Chemistry A European J

124

106

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A three-dimensional, mesoporous, silicate containing zirconium, Zr-TUD-1, was synthesized by a direct hydrothermal treatment method with triethanolamine as a complexing and templating reagent to ensure that zirconium was incorporated as isolated atoms. The mesoporosity of Zr-TUD-1 was confirmed by X-ray diffraction (XRD), N(2) sorption and high-resolution transmission electron micrograph (HR-TEM) studies. The nature and strength of the Lewis acid sites present in Zr-TUD-1 were evaluated by FTIR studies of pyridine adsorption and temperature-programmed desorption of ammonia. FTIR, X-ray photoelectron spectroscopic (XPS) and UV/Vis spectroscopic studies showed that, at Si/Zr ratios of 25 and higher, all the zirconium was tetrahedrally incorporated into the mesoporous framework, while at low Si/Zr ratios, a small part of the zirconium was present as ZrO(2) nanoparticles. Zr-TUD-1 is a Lewis acidic, stable and recyclable catalyst for the Meerwein-Ponndorf-Verley (MPV) reaction and for the Prins reaction.

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Section: Introductionmentioning

confidence: 99%

Zr‐TUD‐1: A Lewis Acidic, Three‐Dimensional, Mesoporous, Zirconium‐Containing Catalyst

Ramanathan

Villalobos

Kwakernaak

et al. 2008

Chemistry A European J

124

106

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“…Several bifunctional catalysts have been proposed before, e.g. Ru/ZnBr 2 /SiO 2 [16], Cu/ SiO 2 [17], Pt/Beta zeolite [18], Ni/Zr-Beta zeolite [15,19], and Pd-heteropolyacid catalyst [20]. We have previously reported [21] that Ir/H-Beta zeolite shows high selectivity (93%) for the hydrogenation of (±)-citronellal to menthols, forming (±)-menthol as main product (75%).…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Catalytic Transformation of Citronellal to Menthol in a Single Step on Ir-Beta Zeolite Catalysts

et al. 2009

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The synthesis of menthol from citronellal was studied on bifunctional Ir/Beta zeolite catalysts, prepared via impregnation of Beta zeolite with different concentrations of Ir. The results show that Beta zeolites, impregnated with Ir, catalyze the one-pot full conversion of citronellal to menthol by consecutive acid-catalyzed cyclization and Ir-catalyzed hydrogenation. The best results (95% selectivity for the menthol isomers, of which 75% is the desired (±)-menthol) were recorded on 3% Ir/Beta zeolite catalyst. In contrast with earlier studies, 0.05 g Ir/Beta catalyst per mL of substrate leads to complete and selective substrate transformation. The textural properties, acidity and hydrogenation function were studied by liquid N 2 adsorption-desorption, FT-IR, XPS and hydrogen chemisorption techniques. To clarify the mechanism of the cyclization of citronellal, tests were also performed using zeolites with different acidity and loaded with other metals (Pt, Pd, Rh, Ru).

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“…Hal tersebut mendorong para peneliti melakukan upaya penggantian situs asam Bronsted dengan situs asam Lewis dengan cara mengembankan logam aktif. Penelitian sebelumnya mengenai katalis berbasis pengemban β-zeolit untuk konversi sitronelal telah banyak dilaporkan, antara lain adalah Ni/Zr-beta (Nie et al 2007), katalis Pt/H-beta yang dapat berperan sebagai katalis dwi fungsi (Mertens et al 2006), katalis Sn/β-zeolit yang memberikan stereoselektivitas 85% (Kang et al 2013), dan katalis Ir/ β-zeolit yang memberikan produk mentol yang tinggi (93%) dalam reaksi satu tahap (Dirk dan Jacobs 2009).…”

Section: Pendahuluanunclassified

“…Difraktogram XRD β-Zeolit yang digunakan menunjukkan puncak-puncak yang khas pada 2θ = 21,5º, 22,5º, 29,5º, dan 43,6º (Gambar 4). Puncak-puncak khas tersebut memiliki kemiripan dengan hasil analisis XRD β-zeolit yang pernah dilakukan (Mertens et al 2006). Mikrograf SEM β-Zeolit (Gambar 5) menunjukkan morfologi β-Zeolit yang kristalnya berbentuk kotak, dengan ukuran kristal yang seragam (sekitar 2 μm).…”

Section: Hasil Dan Pembahasan Isolasi Sitronelal Dari Minyak Serehunclassified

Konversi Sitronelal Menjadi Senyawa Isopulegol dengan Katalis ZnBr2/β-Zeolit

2017

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ABSTRAKKONVERSI SITRONELAL MENJADI ISOPULEGOL DENGAN KATALIS ZnBr2/β-ZEOLIT. Pada penelitian ini telah dilakukan konversi sitronelal menjadi senyawa isopulegol melalui mekanisme reaksi siklisasi dengan katalis ZnBr2/β-Zeolit. Sitronelal diisolasi dari minyak sereh wangi dengan metode distilasi fraksional. Katalis ZnBr2/β-Zeolit dibuat dengan metode impregnasi pada temperatur 400 ºC di bawah aliran gas nitrogen selama 4 jam. Reaksi konversi sitronelal dilakukan dengan metode one-pot synthesis dengan aliran gas nitrogen pada temperatur 120 ºC. Karakterisasi katalis ZnBr2/β-Zeolit dilakukan dengan analisa X ray-Diffraction (XRD) dan Scanning Electron Microscopy-Energy Dispersive X-ray (SEM-EDX).Karakterisasi produk reaksi dilakukan kromatografi gas (GC) dan Gas Chromatography-Mass Spectroscopy (GC-MS). Berdasarkan hasil penelitian, katalis ZnBr2/β-Zeolit memberikan aktivitas lebih baik dibandingkan β-Zeolit, dimana nilai konversi sitronelal menjadi isopulegol sebesar 100% dengan selektivitas terhadap senyawa isopulegol sebesar 75,28% pada temperatur 120 0 C dan waktu reaksi 60 menit.

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Pt/H-beta zeolites as productive bifunctional catalysts for the one-step citronellal-to-menthol conversion

Cited by 42 publications

References 10 publications

Zr‐TUD‐1: A Lewis Acidic, Three‐Dimensional, Mesoporous, Zirconium‐Containing Catalyst

Zr‐TUD‐1: A Lewis Acidic, Three‐Dimensional, Mesoporous, Zirconium‐Containing Catalyst

Heterogeneous Catalytic Transformation of Citronellal to Menthol in a Single Step on Ir-Beta Zeolite Catalysts

Konversi Sitronelal Menjadi Senyawa Isopulegol dengan Katalis ZnBr2/β-Zeolit

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