Alvarado Perea, Leo; Wolff, Tanya; Veit, Peter; Hilfert, Liane; Edelmann, Frank T.; Hamel, Christof; Seidel-Morgenstern, Andreas
Resumen:
Ni/MCM-41 and Ni/AlMCM-41 were synthesized at different Si/Al ratios and tested in the direct conversion
of ethene to propene (ETP-reaction). It was intended to evaluate the effect of modifying the catalyst
acidity on the ETP-reaction rather than optimizing its performance. All catalysts were characterized by
powder XRD, N2-physisorption, 29Si and 27Al MAS NMR, TEM, NH3-TPD, pyridine-DRITFS, H2-TPR, and
TPO. Ni/MCM-41 showed low catalytic activity due to its low acidity. Ni/AlMCM-41 catalyst with a Si/
Al ratio of 60 had high catalytic activity. Characterization results revealed that the catalyst structure does
not have effect on the catalytic activity. Al could be incorporated into the MCM-41 framework up to Si/Al
ratio of 16. Two different Ni-composites on the surface of the MCM-41 and AlMCM-41 were observed.
Deeper characterization is required to know the Ni state. Important deactivation was observed at
450 !C. The nature of the carbonaceous species and reaction mechanism require deeper characterization.