Journal Article

PUBDB-2025-00162

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Exploring structure, temperature and activity correlations in the selective oxidation of lower olefins over Bi–Mo–Co–Fe–O catalysts by spatial reactor profile measurements

Klag, L.Extern* ; Weber, S.Extern* ; Horn, R.Extern* ; Sheppard, T. L.Extern* ; Grunwaldt, J.-D. (Corresponding author)Extern*

2024
RSC Publ. London

This record in other databases:      

Please use a persistent id in citations: doi:10.1039/D3CY01445B  doi:10.3204/PUBDB-2025-00162

Abstract: Improving process efficiency in selective oxidation of lower olefins over mixed metal oxide catalysts requires profound knowledge of the dynamic behaviour of exothermic reactions along the reactor. For this purpose, structure–activity correlations of two Bi–Mo–Co–Fe–O model catalysts were investigated by means of structure, temperature and activity profiling in selective propylene and isobutene oxidation. Both catalysts showed pronounced differences in selectivity, which strongly affected the temperature and gas phase concentration gradients along the reactor, and thus the reaction network of each olefin oxidation process. Complementary structure profiling by synchrotron XRD identified the evolution of crystalline metal oxide phases after testing in propylene oxidation. Molybdate-based structures (e.g., α-Bi$_2$Mo$_3$O$_{12}$, Bi$_3$FeMo$_2$O$_{12}$) were found to moderate oxygen mobility during catalytic reaction and increase selectivity towards acrolein/methacrolein, while particularly single metal oxides (i.e., Co$_3$O$_4$, Fe$_3$O$_4$) enhanced oxygen mobility drastically and favoured total oxidation. Comparison of selective propylene and isobutene oxidation revealed the metal oxide phase ensembles within each catalyst had comparable effects on both reaction networks. Hence, the spatially-resolved testing and characterization allowed a systematic study of the catalytic processes along the reactor, showing great promise for knowledge-based optimization of selective oxidation processes.

Note: DFG for financing the Raman spectrometer system (INST 121384/73-1)

---

Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. FS-PETRA (FS-PETRA)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. DFG project G:(GEPRIS)426888090 - SFB 1441: Verfolgung der aktiven Zentren in heterogenen Katalysatoren für die Emissionskontrolle (TrackAct) (426888090) (426888090)

Experiment(s):

1. PETRA Beamline P21.1 (PETRA III)

Appears in the scientific report 2024

---

Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

---