Surface properties vs activity of meso-ZrO2 catalyst in chemoselective Meerwein-Ponndorf-Verley reduction of citral: Effect of calcination temperature

CA Akinnawo, N Bingwa, R Meijboom - Microporous and Mesoporous …, 2021 - Elsevier
Microporous and Mesoporous Materials, 2021Elsevier
The catalytic transfer-hydrogenation of citral is a vital chemical process in food flavoring,
fragrance, and pharmaceutical industries, that necessitates a high degree of purity of the
product. However, the heterogeneous catalyst that is mainly selective to α, β-unsaturated
alcohol at atmospheric pressure is still lacking. Herein, we prepared a series of mesoporous
ZrO 2 via a soft-templated inverse micelle method, using different calcination temperatures
250–600° C. The effect of the calcination temperature on the intrinsic surface properties of …
Abstract
The catalytic transfer-hydrogenation of citral is a vital chemical process in food flavoring, fragrance, and pharmaceutical industries, that necessitates a high degree of purity of the product. However, the heterogeneous catalyst that is mainly selective to α,β-unsaturated alcohol at atmospheric pressure is still lacking. Herein, we prepared a series of mesoporous ZrO2 via a soft-templated inverse micelle method, using different calcination temperatures 250–600 °C. The effect of the calcination temperature on the intrinsic surface properties of the meso-ZrO2 was revealed by analytical techniques such as N2 adsorption-desorption isotherms, pXRD (powder X-ray diffraction), TEM (transmission electron microscope), and CO2/NH3-TPD (temperature-programmed desorption). The meso-ZrO2 catalysts were compared in the Meerwein-Ponndorf-Verley (MPV) reduction of citral at atmospheric pressure. The meso-ZrO2 calcined at 350 °C presented a superior catalytic activity of 71% citral conversion and 100% selectivity to unsaturated alcohol after 10 h, under optimized reaction conditions. The superior activity is ascribed to the enlarged pore volume, increased surface area, and Lewis acidic sites. The calcination temperature has played a significant role in tailoring the surface properties of the meso-ZrO2, which in turn enhanced the catalytic activity. The meso-ZrO2 catalyst is recyclable, easily regenerated with simple calcination. The meso-ZrO2 shows excellent potential for industrial applications.
Elsevier
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