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      저자 : Nor Irwin Basir (검색결과 2 건)
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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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        Synergy between oxides of Ni and Ca for selective catalytic lactic acid synthesis from glycerol in a single step process

        Ahmad Zuhairi Abdullah,Muhammad Hazim Yaacob,Nor Irwin Basir 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.85 No.-

        Single-step selective catalytic dehydrogenation of glycerol to lactic acid requires a catalyst with strongdehydrogenation and hydration capabilities. A multi-component catalyst consisting of an alkaline earthmetal and assisted by a transition metal is deemed essential to achieve yield lactic acid in this multi-stepreaction. A series of NiO/CaO catalysts with different Ni/Ca ratios were synthesized via a co-precipitationmethod and tested for their catalytic activity. The physicochemical properties of the catalysts werestudied through TGA, SEM, N2-adsorption, CO2-TPD and XRD analyses. The NiO particles were relativelysmaller than those of CaO to enable their deposition on the surface of the latter. High amounts of basicsites of more than 4.84 mmol/gcat were detected on the NiO/CaO catalysts. The lactic acid yield wasstrongly influenced by the molar ratio of the NiO/CaO catalysts due to their improved dehydrogenationand hydration capabilities. The synergy between NiO with CaO in the catalyst was also elucidated. The0.43NiO/CaO catalyst exhibited desirable activity with 41.4% lactic acid yield at 89.3% glycerol conversion. A catalyst loading of 15 wt. %, a reaction temperature of 290 C and 1.5 h of reaction time were needed toachieve this conversion. Thus, the combination of NiO/CaO resulted in the synergy towards achievingbetter lactic acid yield in this selective conversion to lactic acid. However, accurate control of the reactionwas critical as the intermediates and lactic acid were highly reactive to participate in other side-reactions.

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