Preformed precursor of microporous aluminophosphate coating on mesoporous SBA-15: Synthesis, characterization, and catalytic property for selective O-methylation of catechol

Liao, Xiangzhou; Zhou, Zhou; Wang, Zhenlü; Zou, Xingli; Liu, Gang; Jia, Mingjun; Zhang, Wenxiang

doi:10.1016/j.jcis.2006.12.039

Cited by 21 publications

(15 citation statements)

References 37 publications

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“…Zhang and co-workers [9] found that the acid-base properties of aluminium phosphate with lower Ti content were weaker, favouring guaiacol formation and catalytic stability. In addition, the catalytic performance of aluminophosphates could be enhanced by adjusting P/Al ratio [24] or coating microporous aluminophosphate on mesoporous SBA-15 [25], further confirming that suitable acid-base properties were crucial to vapour-phase methylation of catechol with methanol. However, Jafari et al [5] found that catechol conversion and product distribution depended highly on acidity of Ti or Cs modified lanthanum phosphate.…”

Section: Introductionmentioning

confidence: 75%

“…The selective O-methylation of catechol with methanol is commonly regarded as an acid-base catalytic reaction for the production of guaiacol [4,9,10,24,25]. Therefore, the different acid-base properties of metal phosphates may have an effect on their catalytic performance.…”

Section: Discussionmentioning

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: Introductionmentioning

confidence: 75%

Section: Discussionmentioning

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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“…Small amount of sample powder was dispersed in ethanol and dropped on a holey carbon coated copper grid. The acceleration voltage of 200 kV was used [44]. The reaction mixture containing methyl esters was analyzed by Gas chromatography-Mass spectroscopy (CLARUS 500, PerkinElmer, USA).…”

Section: Characterizationsmentioning

confidence: 99%

Optimization of recovery of silica from sugarcane leaf ash and Ca/SBA-15 solid base for transesterification of Calophyllum inophyllum oil

Arumugam

Venkatachalam

2014

J Sol-Gel Sci Technol

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Highly ordered mesoporous material Santa Barbara acid-15 (SBA-15) was obtained from sugarcane leaf ash, a low cost silica source. It is highly critical today to use an inexpensive and non-toxic silica source for SBA-15 production. The objectives of the this study were to (1) investigate the relationship between the time of sonication (t), amount of sodium hydroxide used (W R ) and temperature (T) maintained using response surface methodology and obtain maximum percentage recovery of silica, (2) to synthesis SBA-15 from recovered silica (water glass), (3) to produce biodiesel from Calophyllum inophyllum oil using methanol as alcohol under heterogeneous catalysis. The catalyst medium was a calcium acetate impregnated silicate mesoporous material called SBA-15. The optimum conditions for maximum recovery of SiO 2 (57.99 %) were found to be: reaction temperature-110°C, NaOH to ash weight ratio-1:3 and sonication reaction time-5 h. The transesterification reaction was conducted with different methanol to oil ratios (3:1, 8:1, 12:1, 16:1, 18:1) at different temperatures such as 50, 60, 70, 80 and 90°C in the presence of heterogeneous catalyst. The maximum yield of 88.77 % at 16:1 alcohol to oil ratio (molar) and 96.82 % at the temperature of 80°C was obtained.

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“…By the formation of mesopores, the penetration resistance of the micropores becomes minimal. Mesopores can be formed in several ways, including: (1) using a variety of templates, especially carbon [6][7][8][9]; (2) using mate-rials as surfactants [10][11][12][13][14][15][16] and (3) alkali treatment [17][18][19][20][21][22][23][24]. Among the methods for the formation of mesopores in zeolites, using a carbon template is the most suitable.…”

Section: Introductionmentioning

confidence: 99%

A novel method for enhancing the stability of ZSM-5 zeolites used for catalytic cracking of LPG: Catalyst modification by dealumination and subsequent silicon loading

Vafi

Karimzadeh

2016

Chinese Journal of Catalysis

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Preformed precursor of microporous aluminophosphate coating on mesoporous SBA-15: Synthesis, characterization, and catalytic property for selective O-methylation of catechol

Cited by 21 publications

References 37 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

Optimization of recovery of silica from sugarcane leaf ash and Ca/SBA-15 solid base for transesterification of Calophyllum inophyllum oil

A novel method for enhancing the stability of ZSM-5 zeolites used for catalytic cracking of LPG: Catalyst modification by dealumination and subsequent silicon loading

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