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Enhanced Dehydrogenative Aromatization of Propane by Incorporating Fe and Pt into the Zn/HZSM‑5 Catalyst
journal contribution
posted on 2018-10-29, 00:00 authored by Wei Zhou, Jiaxu Liu, Long Lin, Xiaotong Zhang, Ning He, Chunyan Liu, Hongchen GuoIn
this study, an attempt was made to modify the Zn/HZSM-5 aromatization
catalyst by successively impregnating Fe and Pt. Multitechniques including
NH3 adsorption FT-IR, TEM, HAADF-STEM, XPS, and operando dual beam FT-IR spectroscopy of propane aromatization
were employed to investigate the interactions among Zn, Fe, and Pt
and the synergetic catalysis among the Brønsted acid sites, Lewis
acid sites, and metallic sites of the ZnFePt/HZSM-5 catalyst. Results
show that an optimized trimetallic Zn1.0Fe0.3Pt0.1/HZSM-5 catalyst has much lower dry gas production
and significantly enhanced propane transformation activity and aromatization
selectivity compared with the parent Zn/HZSM-5. The excellent performance
of the trimetallic catalyst could be attributed to the high dispersion
of metals, the formation of FePt bimetallic dehydrogenation active
sites, and the promotion effect of FePt sites for the recombinational
desorption of H atoms for the [ZnOZn]2+ sites. The fixed-bed
reaction indicates that the trimetallic Zn1.0Fe0.3Pt0.1/HZSM-5 catalyst also has excellent durability which
is desirable for practical use.
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gas productionIncorporating FeHAADF-STEMtrimetallic catalystXPSHZSMResults showH atomsbeam FT-IR spectroscopyimpregnating FeZnfixed-bed reactionpromotion effectFePt bimetallic dehydrogenationTEMrecombinational desorptionEnhanced Dehydrogenative AromatizationNH 3 adsorption FT-IRFePt sitesLewis acid sitespropane aromatizationBr ønsted acid sitessynergetic catalysisaromatization selectivitypropane transformation activity
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