E f f e c t of A d d e d Sb204, B Í P O 4 o r S n O g o n the C a t a l y t i c P r o p e r t i e s o f Z n F e 2 0 4 i n t h e O x i d a t i ve D e h y d r o g e n a t i o n o f B u t e n e to B u t a d i e ne

FENG-YAN QIU; LU-TAO WENG; E. SHAM; B. DELMON

APPLIED CATALYSIS A-GENERAL

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 1989 vol. 51 p. 235 - 253

0926-860X

ABSTRACT ZnFe204 is a moderately active and selective catalyst for the oxidative dehydrogenation of butene to butadiene. It can be deactivated at high temperatures (> 380°C), probably owing to the segregation of the phase. The properties of ZnFe204 can be modified by mechanically mixing ZnFe204 with Sb204, BÍPO4 and Sn02. At low temperatures, the effect of these phases is negative and follows the order Sn02 > BÍPO4 > Sb204. The effect of these phases appears to be positive at high temperatures (ca. 380° C for Sb204 and BÍPO4 and ca. 420° C for Sn02) and the positive effect decreases in the order BiP04> Sb204> Sn02. This positive effect is explained as being the result of the stabilization of the ZnFe204 phase due to the presence of these external phases. being the result of the stabilization of the ZnFe204 phase due to the presence of these external phases. The results are discussed by considering the migration of oxygen species by added phases and