Formation of (Rh–Fe)–FeOx Complex Sites Enables Methanol Synthesis from CO2
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Tianjin Univ. (China)
Here, we addressed the challenges of designing catalysts for selective CO2 hydrogenation by incorporating oxide Fe species onto Rh nanoparticles. Nanoscopic FeOx domains created a “reverse catalyst” structure (i.e., a metal oxide supported on a metal) that increased the density of interfacial sites compared to traditional supported catalysts. The contact between the metal nanoparticle and the oxide overlayer induced the formation of a surface Rh-Fe alloy that stabilize methoxy groups while suppressing hydrogenolysis to methane. Sites at FeOx-metal interfaces interact with CO2 sevenfold stronger than sites on metal surfaces, show larger energy barriers to cleave the C-O bonds, and offer a barrierless pathway for hydrogenation of methoxy species to methanol. Consequently, the multifunctional sites over FeOx/Rh-Fe catalysts highlight and meet the requirements of a selective methanol catalyst: strong interaction with CO2 to ensure high density of transition states; metal sites to activate and make hydrogen available to surface intermediates; and high energy barriers for C-O bond cleavage to form carbides. These synthesis and catalytic chemistries, demonstrated for Rh-Fe-FeOx interfaces, enable us to overcome the limitations to the design of methanol production catalysts.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
- Grant/Contract Number:
- AC02-06CH11357; AC05-76RL01830
- OSTI ID:
- 2407052
- Report Number(s):
- PNNL-SA--199381
- Journal Information:
- ACS Catalysis, Journal Name: ACS Catalysis Journal Issue: 13 Vol. 14; ISSN 2155-5435
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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