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A review on one-pot synthesis of acrylic acid from glycerol on bi-functional catalysts
Muhammad Yusri Ahmad,Nor Irwin Basir,Ahmad Zuhairi Abdullah 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.93 No.-
Oxydehydration is one of the possible reactions to valorize glycerol to acrylic acid that has high demandin industry. Glycerol oxydehydration is a two-step reaction that is an interesting, yet challengingapproach to give high acrylic acid yield. The reaction consists of the dehydration to 3-hydroxypropanaland subsequently to acrolein catalyzed by mainly Brønsted acid sites. Selective oxidation catalyzed bymetal sites should then be carried out to form acrylic acid. A single-step or one-pot conversion requires amulti-component catalyst addressing the requirements of both steps to selectively form the desiredproduct. Strong acid sites will catalyze the undesired glycerol oxidation reactions while metals with highredox capability tend to cause oxidative decomposition of acrolein. This work reviews the recent workson glycerol catalytic oxydehydration to form acrylic acid in a one-pot approach. The complete reactionmechanism and specific requirements are elucidated. Main focus is given to the pros and cons of fourgroups of catalysts i.e. vanadium pyrophosphates, supported heteropoly acids, mixed metal oxides andmolecular sieves. The roles of specific acid sites, type and composition of active components and redoxstrength of active components are critically reviewed.
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