2018
DOI: 10.1016/j.jcat.2018.01.010
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Improving the selectivity to 4-tert-butylresorcinol by adjusting the surface chemistry of heteropolyacid-based alkylation catalysts

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Cited by 28 publications
(27 citation statements)
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“…The literature also reports that the leaching of heteropolyacids from the support is dependent on the catalyst preparation conditions [9,21]. In order to eliminate the excess HPMo of 25% HPMo (w/w) in the supports (BCM and BLM), which could be responsible for the homogeneous reaction phase, 5 g of sample was used, which was inserted in a Soxhlet extractor with ethanol (500 mL each) under constant stirring for 24 h according to procedure, adapted from [9,51]. At the end of this period the solid was recovered by filtration, washed extensively with water and at room temperature.…”
Section: Methodsmentioning
confidence: 99%
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“…The literature also reports that the leaching of heteropolyacids from the support is dependent on the catalyst preparation conditions [9,21]. In order to eliminate the excess HPMo of 25% HPMo (w/w) in the supports (BCM and BLM), which could be responsible for the homogeneous reaction phase, 5 g of sample was used, which was inserted in a Soxhlet extractor with ethanol (500 mL each) under constant stirring for 24 h according to procedure, adapted from [9,51]. At the end of this period the solid was recovered by filtration, washed extensively with water and at room temperature.…”
Section: Methodsmentioning
confidence: 99%
“…The removal of those Keggin units was necessary to avoid their leaching in the liquid medium during the reaction. In this manner, the measurement of the HPMo in the Soxhlet washing solvent made it also possible to indirectly estimate the amount of HPMo efficiently immobilized [20,21,51]. By spectroscopic analysis of ultraviolet-visible spectroscopy (UV-vis) the quantities of HPMo were estimated in the recovered ethanol after extraction and thus, by difference, the quantities of HPMo that were effectively incorporated in the matrices BC and BL [20,21,51].…”
Section: Methodsmentioning
confidence: 99%
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“…Acidity measurements of the catalyst surface were done by pyridine adsorption and temperature programmed desorption as follows . The catalysts were pressed to obtain a wafer.…”
Section: Methodsmentioning
confidence: 99%
“…Acidity measurements of the catalyst surface were done by pyridine adsorption and temperature programmed desorption as follows. [65] The catalysts were pressed to obtain a wafer. The wafer was weighted and then placed in a sample holder inside a Pyrexcell especially designed for the controlled heating of the sample under vacuum and equipped with an optical NaCl window.…”
Section: Instrumentalmentioning
confidence: 99%