SELECTIVITY OF EGG-SHELL PD-BASED CATALYSTS DURING THE 1-BUTYNE HYDROGENATION UNDER LIQUID-PHASE CONDITIONS?

FRANKLIN J MENDEZ; OSCAR CORONA ; OSVALDO M. MARTÍNEZ; YAHSÉ ROJAS-CHALLA, ; GERMÁN GARCÍA COLLI; JAVIER A. ALVES; YANET VILLASANA; JOAQUIN L. BRITO

Ciudad de Mexico

Congreso; XXVII Congreso Ibero-Americano de Catálisis; 2020

Academia de Catálisis / FISOCAT

A comparative study of 1-butyne hydrogenation using two reduced Al2O3-supported Pd-based catalysts was carried out in a total recirculation system with external fixed-bed reactor. An egg-shell NiPd/CeO2-Al2O3 catalyst (NiPdCe) with Pd loading = 0.5 wt%, Ni/Pd atomic ratio = 1 and CeO2 loading = 3 wt% was synthesized and characterized, and it was compared with a Pd/Al2O3 commercial formulation (PdCC). The reduced catalysts were characterized by XRD, XPS and HRTEM. The textural characteristics and NH3-TPD profiles of the unreduced catalysts were also obtained. Both catalysts showed similar 1-butyne conversion at 120 min, however, at the beginning of reaction the NiPdCe catalyst presented higher 1-butyne conversion. The selectivity to BE formation (S factor) was also similar at xBY > 20000 ppm of BY, but PdCC catalyst presented higher S values at xBY < 20000 ppm BY. The catalysts also presented distinct isomerizing and hydrogenating behaviours. Thus, NiPdCe showed higher ability for isomerization reactions, while PdCC exhibited higher hydrogenating capability. Thus, under the used reaction conditions, NiPdCe catalyst represents the best compromise between activity and selectivity, especially, due to its lower hydrogen consumption.