Back to Search
Start Over
Performance Exploration of Ni-Doped MoS 2 in CO 2 Hydrogenation to Methanol.
- Source :
- Molecules; Aug2023, Vol. 28 Issue 15, p5796, 18p
- Publication Year :
- 2023
-
Abstract
- The preparation of methanol chemicals through CO<subscript>2</subscript> and H<subscript>2</subscript> gas is a positive measure to achieve carbon neutrality. However, developing catalysts with high selectivity remains a challenge due to the irreversible side reaction of reverse water gas shift (RWGS), and the low-temperature characteristics of CO<subscript>2</subscript> hydrogenation to methanol. In-plane sulfur vacancies of MoS<subscript>2</subscript> can be the catalytic active sites for CH<subscript>3</subscript>OH formation, but the edge vacancies are more inclined to the occurrence of methane. Therefore, MoS<subscript>2</subscript> and a series of MoS<subscript>2</subscript>/Ni<subscript>x</subscript> and MoS<subscript>2</subscript>/Co<subscript>x</subscript> catalysts doped with different amounts are prepared by a hydrothermal method. A variety of microscopic characterizations indicate that Ni and Co doping can form NiS<subscript>2</subscript> and CoS<subscript>2</subscript>, the existence of these substances can prevent CO<subscript>2</subscript> and H<subscript>2</subscript> from contacting the edge S vacancies of MoS<subscript>2</subscript>, and the selectivity of the main product is improved. DFT calculation illustrates that the larger range of orbital hybridization between Ni and MoS<subscript>2</subscript> leads to CO<subscript>2</subscript> activation and the active hydrogen is more prone to surface migration. Under optimized preparation conditions, MoS<subscript>2</subscript>/Ni<subscript>0.2</subscript> exhibits relatively good methanol selectivity. Therefore, this strategy of improving methanol selectivity through metal doping has reference significance for the subsequent research and development of such catalysts. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14203049
- Volume :
- 28
- Issue :
- 15
- Database :
- Complementary Index
- Journal :
- Molecules
- Publication Type :
- Academic Journal
- Accession number :
- 169908868
- Full Text :
- https://doi.org/10.3390/molecules28155796