Spectroscopic study and catalytic activity for H2O2 decomposition of new zeolite-porphyrin systems

• Published in: Reaction kinetics, mechanisms and catalysis mechanisms and catalysis, 2016-06, Vol.118 (1), p.337-348
• Main Authors: Ion, Rodica Mariana, Faraon, Victor Alexandru, Senin, Raluca Madalina, Fierascu, Radu Claudiu
• Format: Article
• Language: English
• Subjects: Catalysis; Chemistry; Chemistry and Materials Science; Industrial Chemistry/Chemical Engineering; Physical Chemistry
• ISSN: 1878-5190; 1878-5204
• DOI: 10.1007/s11144-016-0982-0

In this paper, some new catalytic systems—a metallic complex of 5,10,15,20-tetra-p-tolyl-porphyrin (TTP) with Fe [ClFe(III)TTP] entrapped into a natural zeolite (clinoptilolite) and into two synthetic zeolites (X-71, HZSM-5) were synthesized and characterized by energy-dispersive X-ray fluorescence (EDXRF), Fourier transform infrared spectroscopy (FTIR), UV–Vis spectroscopy, thermal analyses (TGA/SDTA) and tested subsequently as catalysts in the hydrogen peroxide decomposition reaction. The metalloporphyrin ClFe(III)TTP used was adsorbed in different proportions on the zeolite matrix. It is entrapped into The X-71 zeolite (due to its higher pore size), and adsorbed onto the other zeolites: HZSM-5 and clinoptilolite. The catalytic activities of the synthesized systems were discussed from kinetic and mechanistic aspects points of view. This paper also evidenced the generation of oxo-dimers of porphyrin during the catalytic reaction, this aspect being valuable for ClFe(III)TTP. The study of the catalytic activities of the synthesized systems leads us to the proposal of an adequate mechanism for the degradation of hydrogen peroxide in the presence of the synthesized catalysts. The most efficient catalyst according to our study is the ClFe(III)TTP/X-71 system.