Abstract
The effect of the metal incorporation order used in the preparation of bimetallic ultrastable Y (USY) zeolite catalysts for CO 2 methanation has been studied. First, a Na-USY(3) zeolite was impregnated with 5 % of Ni and 3 % of Ce in three ways: Ni before Ce (Ce/Ni), Ce before Ni (Ni/Ce), and co-impregnation (Ni-Ce). Stronger interactions between Ni and Ce species are established when Ni is incorporated after or simultaneously with Ce, enhancing the reducibility of the Ni species and decreasing the Ni 0 average size to approximately 2.5 nm. However, the CO 2 adsorption capacity is smaller for the sample in which Ce is incorporated before Ni. Even though larger Ni 0 particles (13.3 nm) are formed when Ni is impregnated first, a good CO 2 adsorption capacity was also observed for this sample. Co impregnation was finally found as the best preparation method, the results being confirmed for an optimized USY catalyst in terms of Ni content, Si/Al ratio, and compensating cation.
| Original language | English |
|---|---|
| Pages (from-to) | 2773-2781 |
| Number of pages | 9 |
| Journal | ChemCatChem |
| Volume | 10 |
| Issue number | 13 |
| Early online date | 30 Apr 2018 |
| DOIs | |
| Publication status | Published - 9 Jul 2018 |
Bibliographical note
AcknowledgementsM.C. Bacariza thanks the Fundacao para a Ciencia e Tecnologia (FCT) for her PhD grant (SFRK/BD/52369/2013) and for financial support for the research group (UID/QUI/00100/2013). The authors thank also the CEOPS Project (CO2—loop for energy storage and conversion to organic chemistry through advanced catalytic processes systems), which has received funds from the European Union’s Seventh Framework Programme for research, technological development, and demonstration under grant agreement number [309984]. Finally,the authors want to thank Sandra Casale for help with the analysis and interpretation of the microscopy results
Keywords
- cerium
- CO methanation
- nickel
- preparation method
- zeolites