Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 15, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202200301
Keywords
Activation; CO2 Conversion; Copper; operando Analysis; Zinc
Categories
Funding
- SNSF [200021_178943]
- Eidgenossische Technische Hochschule Zurich
- Swiss National Science Foundation (SNF) [200021_178943] Funding Source: Swiss National Science Foundation (SNF)
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In this study, the activation process of a copper-zinc-alumina (CZA) catalyst was investigated using operando X-ray absorption spectroscopy and X-ray diffraction. The results revealed two major events, the reduction of copper and the ripening and re-oxidation of zinc, that significantly altered the catalyst's structure. Understanding these events is crucial for developing effective start-up protocols.
The copper-zinc-alumina (CZA) catalyst is one of the most important catalysts. Nevertheless, understanding of the complex CZA structure is still limited and hampers further optimization. Critical to the production of a highly active and stable catalyst are optimal start-up procedures in hydrogen. Here, by employing operando X-ray absorption spectroscopy and X-ray diffraction, we follow how the industrial CZA precursor evolves into the working catalyst. Two major events in the activation drastically alter the copper- and zinc-containing components in the CZA catalyst and define the final working catalyst structure: the reduction of the starting copper(II) oxide, and the ripening and re-oxidation of zinc oxide upon the switch to catalytic conditions. These drastic events are also accompanied by other gradual, structural changes. Understanding what happens during these events is key to develop tailored start-up protocols that are aimed at maximal longevity and activity of the catalysts.
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