Abstract
Solid acids such as ZrO2 & Mo (VI)/ZrO2 were coated on a honeycomb monolith by impregnation method. These catalytic materials were characterized by NH3-TPD, PXRD and SEM techniques. Salicylate esters were synthesized via transesterification of methyl salicylate with different alcohols over these catalytic materials. An excellent yield of Salicylate esters was obtained under specific reaction conditions. A correlation between the surface acidity, PXRD phase and catalytic activity of Mo (VI)/ZrO2 was observed. The thermally regenerated catalytic material was reused repeatedly with a consistent high yield of salicylate esters. The honeycomb coated with zirconia catalysts were found to be economical, efficient and ecofriendly (3E concept).
Highlights
Metal oxide based solid acids as heterogeneous catalysts are extremely useful in many large-volume applications, especially in the production of fine and specialty chemicals as well as in the petrochemical industry [1,2]
Zirconia was found to be less acidic when compared to 6% Mo (VI)/ZrO2 (MZ) indicating that the incorporation of Mo (VI) ions increases the number of acid sites on zirconia thereby increasing the total surface acidity (TSA) values of 6% MZ [9]
PXRD patterns of 6% MZ consisted of only peaks corresponding to tetragonal phase and the peaks corresponding to monoclinic phase are absent
Summary
Metal oxide based solid acids as heterogeneous catalysts are extremely useful in many large-volume applications, especially in the production of fine and specialty chemicals as well as in the petrochemical industry [1,2]. Zirconia based solid acids such as VOx/ZrO2, MoOx/ZrO2 & WOx/ZrO2 have been synthesized and used as catalysts in a few liquid & vapor phase reactions [3,4,5]. Though these zirconia based solid acid are superior catalysts and free form deactivation, they are less explored for organic synthesis [6]. Honeycomb monolith coated with solid acids such as zirconia and its modified forms would be a novel and extremely useful technique in liquid phase reactions for the production of fine and specialty chemicals as well as in the petrochemical industry. Salicylate esters are industrially important and are mainly used in sun-tan lotions, antiseptic creams, etc
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