Preparation and characterization of lanthanum phosphate catalysts for O-methylation of phenol to anisole in gas phase

Chada, Raji Reddy; Ketike, Thirupathaiah; Boilla, Adinarayana Reddy; Gangadharam, Sarala Devi; Kamaraju, Seetha Rama Rao; Burri, David Raju

doi:10.1016/j.mcat.2017.06.007

Cited by 12 publications

(6 citation statements)

References 26 publications

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“…These observations confirm the formation of metal phosphates, thus supporting the XRD results. [32,33]. These observations confirm the formation of metal phosphates, thus supporting the XRD results.…”

Section: Basic Physicochemical Properties Of Metal Phosphates Samplessupporting

confidence: 88%

“…1046 cm −1 and 615 cm −1 are attributed to P-O asymmetric stretch vibration and O=P-O bending vibration, and the bands at ca. 538 cm −1 are due to O-P-O bending vibration typical for PO4 3− [32,33]. These observations confirm the formation of metal phosphates, thus supporting the XRD results.…”

Section: Basic Physicochemical Properties Of Metal Phosphates Samplessupporting

confidence: 86%

“…Figure 2 shows the FT-IR spectra of different M-P-O samples. As shown for all metal phosphates, the absorption band at 3430 cm −1 and 1628 cm −1 are ascribed to O-H stretching vibration and O-H bending vibration of adsorbed water molecules, respectively [31,32]. The band at ca.…”

Section: Basic Physicochemical Properties Of Metal Phosphates Samplesmentioning

confidence: 67%

“…Catalysts 2021, 11, x FOR PEER REVIEW 3 of 11 vibration and O-H bending vibration of adsorbed water molecules, respectively [31,32]. The band at ca.…”

Section: Basic Physicochemical Properties Of Metal Phosphates Samplesmentioning

confidence: 99%

“…For selective O-methylation of catechol and some other alkylation reactions, the catalytic activity is correlated to the acidity and basicity of catalysts [25,32,34].…”

Section: Tpd Characterizationmentioning

confidence: 99%

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Vapour-Phase Selective O-Methylation of Catechol with Methanol over Metal Phosphate Catalysts

Mao

et al. 2021

Catalysts

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Guaiacol (2-methoxyphenol), an important fine chemical intermediate, is conventionally synthesized by liquid-phase processes with expensive, corrosive and toxic methylating agents such as dimethyl sulphate and dimethyl iodide. Recently, vapour-phase alkylation of catechol (1, 2-dihydroxybenzene) with methanol for the synthesis of guaiacol in the presence of heterogeneous catalysts has received more attention, as the route is economical and environmentally friendly. However, most of the investigated catalysts exhibited unsatisfactory catalytic performance for industrial applications. In this study, five metal phosphates M-P-O (M = La, Ce, Mg, Al, Zn) catalysts were synthesized and tested in the selective O-methylation of catechol with methanol. Among these catalysts, cerium phosphate (CP) showed the highest catalytic activity and guaiacol yield. Lanthanum phosphate (LP) was the second most active, which was still obviously better than magnesium phosphate (MP) and aluminium phosphate (ALP). Zinc phosphate (ZP) was not active in the reaction. Relevant samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), N2 adsorption-desorption, temperature programmed desorption of NH3 or CO2 (NH3-TPD, CO2-TPD). The suitable acid-base properties contribute to the superior catalytic performance of CP. Long-term stability and regeneration tests were also studied.

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Section: Basic Physicochemical Properties Of Metal Phosphates Samplessupporting

confidence: 88%

Section: Basic Physicochemical Properties Of Metal Phosphates Samplessupporting

confidence: 86%

Section: Basic Physicochemical Properties Of Metal Phosphates Samplesmentioning

confidence: 67%

“…Catalysts 2021, 11, x FOR PEER REVIEW 3 of 11 vibration and O-H bending vibration of adsorbed water molecules, respectively [31,32]. The band at ca.…”

Section: Basic Physicochemical Properties Of Metal Phosphates Samplesmentioning

confidence: 99%

“…For selective O-methylation of catechol and some other alkylation reactions, the catalytic activity is correlated to the acidity and basicity of catalysts [25,32,34].…”

Section: Tpd Characterizationmentioning

confidence: 99%

See 3 more Smart Citations

Vapour-Phase Selective O-Methylation of Catechol with Methanol over Metal Phosphate Catalysts

Mao

et al. 2021

Catalysts

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Highly Active and Stable P₂O₅ Catalysts Supported on Mesoporous Silica Promoted with Ce for the O‐Methylation of Catechol

Hong,

Sheng,

Zhou

et al. 2024

ChemistrySelect

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P2O5 has been widely used as an acid‐base catalyst for the O‐methylation of catechol to guaiacol due to its suitable acid strength; however, its stability, which is a significant concern for industrial applications, has not seen significant breakthroughs. Herein, we developed a facile impregnation strategy to synthesize Ce promote P2O5 supported on mesoporous silica (CeP/SBA). The CeP/SBA‐500 carbonized at 500 °C exhibited the highest catalytic activity with a catechol conversion of 71.5 %. The high activity stems from the addition of Ce, forming CePO4, which exhibits improved surface acidity compared to P2O5. Importantly, chemisorption and in situ infrared studies revealed that CePO4 shows stronger adsorption of catechol, which then rapidly converts to guaiacol. The CeP/SBA‐500 exhibits excellent stability with no activity decrease after 10 h of continuous flow reaction, attributed to the absence of a decrease in CePO4 surface acidity.

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Continuous Synthesis of Fuel Additives Alkyl Levulinates via Alcoholysis of Furfuryl Alcohol over Silica Supported Metal Oxides

et al. 2018

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Preparation and characterization of lanthanum phosphate catalysts for O-methylation of phenol to anisole in gas phase

Cited by 12 publications

References 26 publications

Vapour-Phase Selective O-Methylation of Catechol with Methanol over Metal Phosphate Catalysts

Vapour-Phase Selective O-Methylation of Catechol with Methanol over Metal Phosphate Catalysts

Highly Active and Stable P₂O₅ Catalysts Supported on Mesoporous Silica Promoted with Ce for the O‐Methylation of Catechol

Continuous Synthesis of Fuel Additives Alkyl Levulinates via Alcoholysis of Furfuryl Alcohol over Silica Supported Metal Oxides

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Preparation and characterization of lanthanum phosphate catalysts for O-methylation of phenol to anisole in gas phase

Cited by 12 publications

References 26 publications

Vapour-Phase Selective O-Methylation of Catechol with Methanol over Metal Phosphate Catalysts

Vapour-Phase Selective O-Methylation of Catechol with Methanol over Metal Phosphate Catalysts

Highly Active and Stable P2O5 Catalysts Supported on Mesoporous Silica Promoted with Ce for the O‐Methylation of Catechol

Continuous Synthesis of Fuel Additives Alkyl Levulinates via Alcoholysis of Furfuryl Alcohol over Silica Supported Metal Oxides

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Highly Active and Stable P₂O₅ Catalysts Supported on Mesoporous Silica Promoted with Ce for the O‐Methylation of Catechol