Estudio espectroscópico y termodinámico de la adsorción de CO y CO2 en zeolitas

  1. Fiol Bibiloni, Gabriel
Supervised by:
  1. Montserrat Rodríguez Delgado Director
  2. Carlos Otero Areán Director

Defence university: Universitat de les Illes Balears

Fecha de defensa: 07 June 2013

Committee:
  1. María Carmen Rosselló Matas Chair
  2. Gemma Turnes Palomino Secretary
  3. José Bernardo Parra Soto Committee member
  4. Sofía Calero Committee member
  5. Camino Trobajo Fernández Committee member

Type: Thesis

Teseo: 349916 DIALNET lock_openRepositoriUIB editor

Abstract

The adsorption complexes of CO in the zeolites Na-ZSM-5 and K-ZSM-5 were investigated by means of variable-temperature IR spectroscopy and DFT calculations on periodic models. The following types of species were found, M+ CO, M+ OC y M+ CO M+ (M = Na, K), which were characterized by their corresponding C¿O stretching frequency and standard adsorption enthalpy. Also, the adsorption complexes of CO2 in the zeolites K-FER and K-L were studied. K-FER gave the species OCO y K+ OCO K++; K-L gave only the K+ OCO adsorption species. Finally, the effect of progressive substitution of Na+ or K+ for H+ in the zeolites H-ZSM-5 and H-Y was investigated; showing that such a substitution constitutes and effective means to tailor the zeolite Brønsted acid strength, which decreases when the degree of substitution of the alkali metal cation for the proton increases.