Estudio sobre la influencia del catión metálico en la actividad catalítica y comportamiento magnético de zeolitas ZSM-5

CLARA SAUX; MARÍA S. RENZINI; PAULA BERCOFF; HÉCTOR BERTORELLO; LILIANA B. PIERELLA

Avances en Ciencias e Ingeniería

Executive Business School

Lugar: La Serena-Chile; Año: 2011 vol. 2 p. 1 - 10

0718-8706

<!-- /* Font Definitions */ @font-face {font-family:Tahoma; panose-1:2 11 6 4 3 5 4 4 2 4; mso-font-charset:0; mso-generic-font-family:swiss; mso-font-pitch:variable; mso-font-signature:1627421319 -2147483648 8 0 66047 0;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> ZSM-5 zeolites with Si/Al molar ratio of 17 were synthesized by hydrothermal method. Afterwards, cobalt and chromium were incorporated via wet impregnation in a 3 wt%. According with X ray diffraction patterns, matrix structure and cristallinity are not affected by transition metals incorporation. Even though, Co3O4 and Cr2O3 species are detected for Co-ZSM-5 and Cr-ZSM-5 samples, respectively. Room temperature magnetization measures showed transition metal effect over diamagnetic zeolite matrix behavior with the appearance of hysteresis cycles which do not saturate ought to a paramagnetic component. Both materials were evaluated as catalysts for styrene selective oxidation with hydrogen peroxide showing good results in terms of activity with high selectivity values (up to 70 mol%) towards benzaldehyde.