TY - JOUR
T1 - Relevance of the Mo-precursor state in H-ZSM-5 for methane dehydroaromatization
AU - Vollmer, Ina
AU - Li, Guanna
AU - Yarulina, Irina
AU - Kosinov, Nikolay
AU - Hensen, Emiel J.
AU - Houben, Klaartje
AU - Mance, Deni
AU - Baldus, Marc
AU - Gascon, Jorge
AU - Kapteijn, Freek
N1 - Accepted Author Manuscript
PY - 2018/1/1
Y1 - 2018/1/1
N2 - Although the local geometry of Mo in Mo/HZSM-5 has been characterized before, we present a systematic way to manipulate the configuration of Mo and link it to its catalytic properties. The location and geometry of cationic Mo-complexes, the precursor of the active metal site for methane dehydroaromatization, are altered by directing the way they anchor to the framework of the zeolite. The feature used to direct the anchoring of Mo is the location of Al in the zeolite framework. According to DFT calculations, the local geometry of Mo should change, while UV-vis and pyridine FTIR spectroscopy indicated differences in the dispersion of Mo. Both aspects, however, did not influence the catalytic behavior of Mo/HZSM-5, indicating that as long as enough isolated Mo species are present inside the pores of the zeolite, the catalytic behavior is unaffected. This paves the way to better understand how the Mo oxo precursor transforms into the active phase under the reaction conditions.
AB - Although the local geometry of Mo in Mo/HZSM-5 has been characterized before, we present a systematic way to manipulate the configuration of Mo and link it to its catalytic properties. The location and geometry of cationic Mo-complexes, the precursor of the active metal site for methane dehydroaromatization, are altered by directing the way they anchor to the framework of the zeolite. The feature used to direct the anchoring of Mo is the location of Al in the zeolite framework. According to DFT calculations, the local geometry of Mo should change, while UV-vis and pyridine FTIR spectroscopy indicated differences in the dispersion of Mo. Both aspects, however, did not influence the catalytic behavior of Mo/HZSM-5, indicating that as long as enough isolated Mo species are present inside the pores of the zeolite, the catalytic behavior is unaffected. This paves the way to better understand how the Mo oxo precursor transforms into the active phase under the reaction conditions.
UR - http://resolver.tudelft.nl/uuid:c1a410f8-dad5-408a-8ad1-ec35f673d59d
UR - http://www.scopus.com/inward/record.url?scp=85041510829&partnerID=8YFLogxK
U2 - 10.1039/c7cy01789h
DO - 10.1039/c7cy01789h
M3 - Article
AN - SCOPUS:85041510829
SN - 2044-4753
VL - 8
SP - 916
EP - 922
JO - Catalysis Science and Technology
JF - Catalysis Science and Technology
IS - 3
ER -