Valorización de cloroformo mediante hidrodecloración con catalizadores de Pd soportado en zeolitas

C. FERNÁNDEZ-RUIZ; J.M. GRAU; L.M. GÓMEZ-SAINERO ; J. BEDIA; E. GARCÍA; L.A. DOSSO; J.J. RODRÍGUEZ

Coimbra

Congreso; XXVI Congreso Iberoamericano de Catálisis; 2018

Sociedad Portuguesa de Química

This work analyzes the catalytic hydrodechlorination (HDC) of chloroform (TCM) in gas phase with the objective of maximizing the selectivity to ethane and propane. The catalysts used were based on five zeolites of different nature with different Pd contents (1 and 0.5 wt%). The zeolitic supports were impregnated by incipient wetness with the concentrations indicated above, and denoted as Pd(1/0.5)HMOR, Pd(1/0.5)NaY, Pd(1/0.5)KL, and those substituted in order to increase its acidity, of the last two Pd(1/0.5)HY and Pd(1/0.5)HL. The catalysts were characterized by TEM, XRD, XPS and adsorption-desorption of N2 at -196 ° C. The different nature of the supports resulted in different selectivities to C2 and C3 hydrocarbons, although no significant differences in conversion were observed between the different concentrations of Pd studied. The size of the Pd particles obtained was directly related to the acidic/basic nature of the zeolites, obtaining the largest particle sizes of Pd in the most basic zeolites (KL and NaY). The catalysts derived from the KL zeolite showed the lowest activities. However, the obtained from the unsubstituted KL zeolite had the highest selectivity to ethane and propane due to its higher proportion of Pd in electrodefficient state and its greater particle size