Dual functional nano zeolites for CO2 capture and conversion

Hartley, Unalome Wetwatana; Murugesan, Praveen Kumar

doi:10.1016/b978-0-323-89851-5.00016-0

Cited by 1 publication

(1 citation statement)

References 122 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Whether the active sites of CO 2 hydrogenation to methanol reactions are Cu-ZnO interfacial sites or Cu-Zn alloy sites remains controversial [10][11][12]. However, the coexistence of Cu, Cu-Zn alloy and ZnO phases in catalysts prepared by impregnation or co-precipitation methods is inevitable, which causes great difficulties in the study of the relationship between the structure of catalysts and their activity [13]. In addition, due to the increase in surface energy of metal species with decreasing particle size, metal species dispersed on supports are thermodynamically unstable and prone to sintering during reaction [14].…”

Section: Introductionmentioning

confidence: 99%

Precise Confinement and Position Distribution of Atomic Cu and Zn in ZSM-5 for CO2 Hydrogenation to Methanol

Ding,

Zhang,

Feng

et al. 2023

Nanomaterials

View full text Add to dashboard Cite

CuZn-based catalysts are widely used in CO2 hydrogenation, which may effectively convert CO2 to methanol and alleviate CO2 emission issues. The precise design of a model catalyst with a clear atomic structure is crucial in studying the relationship between structure and catalytic activity. In this work, a one-pot strategy was used to synthesize CuZn@ZSM-5 catalysts with approximately two Cu atoms and one Zn atom per unit cell. Atomic Cu and Zn species are confirmed to be located in the [54.6.102] and [62.104] tilings, respectively, by using magic-angle spinning nuclear magnetic resonance spectroscopy (MAS NMR), synchrotron X-ray powder diffraction (SXRD) and high-signal-to-noise-ratio annular dark field scanning transmission electron microscopy (High SNR ADF-STEM). Catalytic hydrogenation of CO2 to methanol was used as a model reaction to investigate the activity of the catalyst with confined active species. Compared to the Cu@ZSM-5, Zn@ZSM-5 and their mixture, the CuZn@ZSM-5 catalyst with a close Cu–Zn distance of 4.5 Å achieves a comparable methanol space–time yield (STY) of 92.0 mgmethanol·gcatal−1·h−1 at 533 K and 4 MPa with high stability. This method is able to confine one to three metal atoms in the zeolite channel and avoid migration and agglomeration of the atoms during the reaction, which maintains the stability of the catalyst and provides an efficient way for adjustment of the type and number of metal atoms along with the distances between them in zeolites.

show abstract