Mechanism of cyclohexanol dehydration catalysed by zirconium phosphate

Johnstone, R. A. W.; Liu, Jun-Yao; Whittaker, D.

doi:10.1039/a801360h

Cited by 16 publications

(9 citation statements)

References 7 publications

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“…In the literature, some metal carbonates, phosphates, and sulfates have been used as supports to load metals [2]. From the examples on the catalytic applications of metal phosphate-based catalysts cited in the Introduction section [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,…”

Section: Resultsmentioning

confidence: 99%

“…In a classic book written by Tanabe, Misono, Ono, and Hattori, metal phosphates are highlighted as a new family of solid acids showing some promising applications in heterogeneous catalysis [3]. Metal phosphates can be used as catalysts directly, for instance, in the partial oxidation of propane [4], oxidative dehydrogenation of isobutane to isobutene [5,6,7], oxidative dehydrogenation of ethylbenzene to styrene [8], dehydration of cyclohexanol and 1-methylcyclohexanol [9,10,11], retro-Prins reaction [12,13], terpene rearrangements [14], alkylation of anisole with alcohols [15], dehydrofluorination of CF 3 CH 3 into CF 2 CH 2 [16,17], hydrolysis of CCl 2 F 2 [18,19,20], decomposition of CF 4 [21,22], decomposition of CH 2 FCF 3 [23], decomposition of chlorobenzene [24], decomposition of SF 6 [25,26], and hydrolysis of NF 3 [27]. …”

Section: Introductionmentioning

confidence: 99%

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Metal Phosphate-Supported Pt Catalysts for CO Oxidation

et al. 2014

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Oxides (such as SiO2, TiO2, ZrO2, Al2O3, Fe2O3, CeO2) have often been used to prepare supported Pt catalysts for CO oxidation and other reactions, whereas metal phosphate-supported Pt catalysts for CO oxidation were rarely reported. Metal phosphates are a family of metal salts with high thermal stability and acid-base properties. Hydroxyapatite (Ca10(PO4)6(OH)2, denoted as Ca-P-O here) also has rich hydroxyls. Here we report a series of metal phosphate-supported Pt (Pt/M-P-O, M = Mg, Al, Ca, Fe, Co, Zn, La) catalysts for CO oxidation. Pt/Ca-P-O shows the highest activity. Relevant characterization was conducted using N2 adsorption-desorption, inductively coupled plasma (ICP) atomic emission spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), CO2 temperature-programmed desorption (CO2-TPD), X-ray photoelectron spectroscopy (XPS), and H2 temperature-programmed reduction (H2-TPR). This work furnishes a new catalyst system for CO oxidation and other possible reactions.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Metal Phosphate-Supported Pt Catalysts for CO Oxidation

et al. 2014

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“…Thus, for example, the dehydration of primary alcohols was found to give 1-olefins (Balaceann and Jungers 1957), while the generation of mixtures of olefins differing in the position of the double bond (Parkshtis et al 1985) or even in the carbon skeleton was reported by other workers (Berteau et al 1987). The dehydration of cyclohexanol to cyclohexene is often used as a model reaction to determine the catalytic efficiency of metal phosphates (Johnstone et al 1998) even though the mechanism of the reaction is unknown. These and many similar discrepancies could result from the different surface properties, methods of preparation of aluminas and thermal treatment received during precipitation, drying or calcination.…”

Section: Introductionmentioning

confidence: 99%

Factors Affecting the Activity and Selectivity of Alumina Catalysts in the Dehydration of 1-Butanol

Ashour

2004

Adsorption Science & Technology

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Alumina catalysts A1, A2 and A3 calcined at 873 K, 973 K and 1073 K, respectively, were prepared. The textural properties (surface area and porosity) of these catalysts were determined from nitrogen adsorption studies at 77 K. The acidity (acid amount, acid strength and surface acid density) was determined from the thermal desorption of chemisorbed pyridine. The catalysts were employed in the conversion of 1-butanol at 473-548 K. The surface area and total pore volume decreased and the mean pore radius increased as the calcination temperature increased, while the amount of acid and the surface acid density also depended on the calcination temperature. The conversion of 1-butanol gave 1-butene and dibutyl ether as dehydration products and 2-butenes and isobutene as isomerization products. The acid sites on the alumina catalysts were of different strength, thereby explaining the bifunctionality of these catalysts. The reaction temperature and the flow rate of carrier gas contributed to the performance of alumina catalysts towards the conversion of 1-butanol, and possibly of other alcohols.

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“…6 and 7) through two steps of adsorption and desorption. [16][17][18]. Reaction mechanism of isobutanol dehydration to isobutene on surface acid sites via the concerted mechanism.…”

Section: Catalytic Activitymentioning

confidence: 99%

Characterization of various zinc oxide catalysts and their activity in the dehydration-dehydrogenation of isobutanol

Saad

Riad

2008

J Serb Chem Soc

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Mono and bifunctional zinc oxide catalysts were prepared to study their activity in the catalytic conversion of isobutanol. The prepared catalysts were characterized by X-ray diffraction analysis and nitrogen adsorption measurements. The conversion of isobutanol was taken as a model reaction to measure the catalytic activity of the prepared oxide catalysts. The overall conversion yield of competitive dehydration-dehydrogenation reactions of isobutanol was found to be higher over the binary oxide catalysts than over the single oxide one at all reaction temperature within the range 250-400 °C. The binary oxide catalysts were more selective for isobutene, as the predominant dehydrated product. The single oxide catalyst exhibited higher selectivity towards isobutyraldehyde as the dehydrogenated product, and the selectivity increased with increasing reaction temperature.

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Mechanism of cyclohexanol dehydration catalysed by zirconium phosphate

Abstract: Deuterium-labelling studies have shown that dehydration of cyclohexanol to cyclohexene over amorphous zirconium phosphate at 350 ЊC proceeds through a carbocation mechanism and not through a concerted process.

Cited by 16 publications

References 7 publications

Metal Phosphate-Supported Pt Catalysts for CO Oxidation

Metal Phosphate-Supported Pt Catalysts for CO Oxidation

Factors Affecting the Activity and Selectivity of Alumina Catalysts in the Dehydration of 1-Butanol

Characterization of various zinc oxide catalysts and their activity in the dehydration-dehydrogenation of isobutanol

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