ENCAPSULATION OF NICKEL(II)-SCHIFF BASE COMPLEX IN Y-ZEOLITE FOR IN SITU CHEMISORPTION OF CARBON MONOXIDE
SALAMA, T. (2008). ENCAPSULATION OF NICKEL(II)-SCHIFF BASE COMPLEX IN Y-ZEOLITE FOR IN SITU CHEMISORPTION OF CARBON MONOXIDE. EKB Journal Management System, 19(Issue A-2), 49-64. doi: 10.21608/absb.2008.10782
TAREK M. SALAMA. "ENCAPSULATION OF NICKEL(II)-SCHIFF BASE COMPLEX IN Y-ZEOLITE FOR IN SITU CHEMISORPTION OF CARBON MONOXIDE". EKB Journal Management System, 19, Issue A-2, 2008, 49-64. doi: 10.21608/absb.2008.10782
SALAMA, T. (2008). 'ENCAPSULATION OF NICKEL(II)-SCHIFF BASE COMPLEX IN Y-ZEOLITE FOR IN SITU CHEMISORPTION OF CARBON MONOXIDE', EKB Journal Management System, 19(Issue A-2), pp. 49-64. doi: 10.21608/absb.2008.10782
SALAMA, T. ENCAPSULATION OF NICKEL(II)-SCHIFF BASE COMPLEX IN Y-ZEOLITE FOR IN SITU CHEMISORPTION OF CARBON MONOXIDE. EKB Journal Management System, 2008; 19(Issue A-2): 49-64. doi: 10.21608/absb.2008.10782

ENCAPSULATION OF NICKEL(II)-SCHIFF BASE COMPLEX IN Y-ZEOLITE FOR IN SITU CHEMISORPTION OF CARBON MONOXIDE

Al-Azhar Bulletin of Science
Article 5, Volume 19, Issue A-2, December 2008, Page 49-64  XML PDF (604.09 K)
Document Type: Original Article
DOI: 10.21608/absb.2008.10782
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Author
TAREK M. SALAMA*
Faculty of Science, Chemistry Department, Al-Azhar University, Nasr City 11884, Cairo, Egypt
Abstract
Encapsulation of nickel(II) complex of the Schiff base-type ligand (salicylidene-p-aminobenzoic acid) in the intracrysatalline nano-pores of zeolite-Y is reported. The zeolite-encapsulated trinuclear Ni(II)-Schiff base complex was prepared by diffusion of the ligand through pores of the zeolite, already exchanged with the respective metal (flexible ligand method). The host/guest compound obtained was characterized by elemental analysis, spectroscopic (IR and electronic) studies, surface texture, thermal analysis and powder x-ray diffraction (XRD). The solids were subjected to in situ FT-IR study of adsorbed carbon monoxide.  IR and UV-vis as well as XRD data indicate that the chemical stoichiometry of the complex remains intact upon encapsulation and the geometric environment around the metal ions is a distorted tetrahedral. Experimental evidence indicates that the chemisorption of carbon monoxide is indeed catalyzed by the zeolite-encapsulated complex. Sorption of CO results in the appearance of a series of surface carbonyl species: linear NiII-CO (2198 cm−1), bridged CO (1896 cm−1), C=O derived from acetone-like species (1728 and 1686 cm-1) and physisorbed CO2 (2351 cm−1).  The acetone-like species are stable upon evacuation which can be considered as bound to Lewis acid sites in the zeolite Y. These species are most significant on the zeolite-encapsulated complex than on metal-exchanged zeolite.
Keywords
NaY Zeolite; Encapsulation; Nickel complexes; In situ FTIR
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