Combination of wet-impregnation and ۳D-printing approaches for designing۳D-printed catalytic monolith with improved features

In attempt to address shortcomings of heteropolyacid-based cata lysts, i.e. their high solubility and leaching as wellas their powder form, two approaches, encompassing wet-impregnation and ۳D-printing have been exploitedconjointly. More precisely, Keggin type heteropolyacid was immobilized on acid-treated halloysite and then appliedin ۳D-printing resin to form a catalytically active ink, which was subsequently printed via digital light processingtechnique. The catalytic activity of printed monolith was inspected for Knoevenagel condensation reaction undermild reaction conditions. Investigation of the impacts of influential parameters, including the type of Keggin andits loading on halloysite, as well as content of halloysite-supported Keggin in ۳D-printing ink underlined thatimmobilization of ۲۰ wt% silicotungstic acid on halloysite and its incorporation to printing resin with ۲۰ wt%loading led to the catalyst with maximum efficacy. Facile recovery, high compressive strength and recyclability aswell as insignificant leaching of silicotungstic acid were the merits of this catalyst.

کلیدواژه ها:

۳D-printing ، Heterogeneous catalyst ، Halloysite ، Heteropolyacid