Effect of Acid and Basic Sites for Simultaneo...

Effect of Acid and Basic Sites for Simultaneousselective Acetophenone Hydrogenation And 1, 4-Butanediol Dehydrogenations Over Copper-Based Catalysts

Author Name : Veeralakshmi Vaddeboina, Subba Reddy Alla, Bhaskar Kuthati

DOI: https://doi.org/10.56025/IJARESM.2024.1212242495

ABSTRACT The influence of the supports has been investigated systematically on simultaneous hydrogenation, and dehydrogenation ofacetophenone and1,4-butanediol, respectivelyvia hydrogen transfer. The reaction was carried out inthe vapor phase with temperature ranges between 200-300°C, at atmospheric pressure overa single catalytic fixed-bed reactor. The examined catalysts were developed with10wt%copper deposited overmultiple oxides including MgO, Al2O3, SiO2and MgO-Al2O3 mixed oxidesby conventional wetness impregnation method. The catalysts were well characterized by various techniques to insight the physical and chemical properties using BET surface area, X-RD, X-RF, X-PS, H2-TPR, NH3-TPD, and N2O pulse chemisorption.The activity results of the catalystsrevealed that the moderate acid strengthofboth Cu/MgO and Cu/MgO-Al2O3catalysts wereable to produce 1-phenyl ethanol, while Cu/SiO2 produced 100 % Ethylbenzene from acetophen one when coupled with 1,4- butanediol since high acid strength. However, 1,4-butanediol produced onlyγ-butyrolactone overthe above three catalysts. Contrarily, high acid strength Cu/Al2O3catalystproduced tetrahydrofuran selectivelyfrom 1,4-butanediol through the dehydration process. The activity results stated thatthe conversion of both acetophenone and 1,4- butanediol was controlled by the dispersion andparticle size of copper(Cu0 /Cu+ ), the selectivity of ethylbenzene,1- phenyl ethanol, and butyrolactone was controlled by the supports.