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EFFECT OF GAMMA IRRADIATION ON THE PROPERTIES OF MOLYBDENUM-CONTAINING CATALYSTS

N. G. Kostova1,* , A. A. Spojakina1

Affiliation

  1. Institute of Catalysis, Bulgarian Academy of Sciences Acad. G. Bonchev St. 11, 1113 Sofia, Bulgaria

Abstract

An effective method of modifying the catalytic properties of some oxide and sulfide catalysts is their pretreatment by g-irradiation. Two types of Mo-containing catalysts were irradiated and changes in physico-chemical properties were studied. Alumina and silica were used as supports for catalysts. After irradiation of the catalyst support a signal appears at g=2.00 in the ESR spectrum, ascribed to presence of defects in the crystal lattice. The g irradiation pretreatment of samples leads to considerable modification of their bulk and surface structure and consequently changes in their adsorption and catalytic properties. The g-irradiation stabilizes and slightly increase the thiophene conversion on the H2 and H2S pre treated Mo/g-Al2O3 sample in comparison with non-irradiated one. The g-irradiation of the Mo/SiO2 sample leads to lower but the steady state activity independently from H2 or H2S pre-treatment..

Keywords

Irradiation, hydrodesulfurization, ESR.

Submitted at: April 29, 2005
Accepted at: May 26, 2005

Citation

N. G. Kostova, A. A. Spojakina, EFFECT OF GAMMA IRRADIATION ON THE PROPERTIES OF MOLYBDENUM-CONTAINING CATALYSTS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 3, pp. 1347-1352 (2005)