Resumo

ABELLO, M. C.; VELASCO, A. P.; FERRETTI, O. A.  e  FIERRO, J. L. G.. A Monte Carlo approach to describe the reduction profiles of bidimensional MoO_x structures grown on an alumina sustrate. Lat. Am. appl. res. [online]. 2007, vol.37, n.4, pp.307-313. ISSN 0327-0793.

The reducibility of molybdenum oxide supported on γ-Al₂O₃ was studied by temperature programmed reduction (TPR). Interpretation of the reduction profiles was successfully achieved by applying the Monte Carlo method and taking into account the presence of different molybdenum species on the support surface. Seven reactions were assumed to take place along the reduction process. The first hydrogen consumption peak was assigned to the reduction of Mo⁶⁺ ions present as well-dispersed polymeric species into Mo⁺⁵, while the second one accounts for the reduction not of the Mo⁵⁺ ions generated in the first reduction into Mo⁺⁴ but also for the reduction of monomeric Mo⁶⁺species.

Palavras-chave : Mo Catalysts; Monte Carlo Method; Temperature Programmed Reduction.

        · texto em Inglês     · Inglês ( pdf )