Synthesis of Hydrocinnamaldehyde via Vapor Phase Dehydrogenation of Hydrocinnamyl alcohol over Rice‐Derived MgO‐Supported Copper Catalysts

Abstract

Green synthetic method for the production of hydrocinnamaldehyde via vapour phase dehydrogenation of hydrocinnnamyl alcohol over high surface area MgO (HSA-MgO) supported Cu catalyst at atmospheric pressure without using any additives has been attempted. Cu/HSA-MgO catalysts have been prepared by thermal decomposition of cooked rice grains mixed with magnesium acetate followed by wet impregnation by Cu. The prepared catalysts have been characterized by various physiochemical characterization techniques such as TGA, XRD, BET surface area, TPD of CO 2 , H 2 -TPR, TEM, SEM, EDX and N 2 O pulse chemisorption. Among all the catalysts, 10%Cu/HSA-MgO catalyst is found to be the best catalyst with 78% conversion of hydrocinnnamyl alcohol and 96% selectivity of hydrocinnamaldehyde. N 2 O pulse chemisorption and TPR analysis results divulge the high dispersion of smaller copper particles on the surface of HSA-MgO support which is considered to be responsible for its superior catalytic activity.

Synthesis of high surface area zinc oxide supported copper catalysts and its catalytic activity studies on dehydrogenation of cyclohexanol

“…Using Cu(NO 3 ) 2 .3H 2 O (Sigma-Aldrich, USA, 99.9%) as a copper precursor calculated with nominal loadings (5, 10, 15 and 20 wt.% of copper) were prepared by impregnation method. The required amount of copper nitrate was dissolved in water and then HSA-ZnO support was added slowly, which was dried at 343 K until complete moisture removal and then further dried for 12 h in oven at 373 K. In next step, the dried samples were calcined at 623 K under air ow for 8 h [27][28] [29] [30]. A comparison study was made between a commercial low surface area ZnO based Cu catalyst ad the lab made HAS ZnO catalyst in optimized reaction conditions.…”

Efficient dehydrogenation of dodecanol to dodecanal in a continuous fixed bed reactor over supported Cu catalyst

“…According to the XPS and LMM analysis, the distribution of the surface copper species has been calculated and summarized in The reducibility and interaction between the copper oxides and supports are studied by H 2 -TPR, and there have been some studies on the calcined Cu-based catalysts. Most researchers believe that the reduction peak at low temperature is the reduction of copper oxide species or copper oxide microclusters highly dispersed on the surface of carrier, while the reduction peak at high temperature is the reduction of larger CuO x grains (Koppadi et al 2018). The H 2 -TPR curves in (Fig.…”