Selective hydrogenation of crotonaldehyde over Ir/TiO2 catalysts: Unraveling the metal-support interface related reaction mechanism

Jia, Aiping; Zhang, Wei; Peng, Hantao; Zhang, Yunshang; Song, Tongyang; Li, Lei; Ye, Yanwen; Wang, Yu; Luo, Mengfei; Chen, De-Li; Huang, Weixin; Lu, Ji-Qing

doi:10.1016/j.jcat.2023.05.029

Cited by 4 publications

(3 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The addition of Fe species resulted in the red shift, which suggested the presence of an Ir–Fe alloy. , Increasing the loading amount of Ir species (Ir: 5 → 20 wt %) led to an increase in the low-frequency CO band (∼2040 cm –1 ) in Ir/BN, suggesting the presence of more low-coordinate sites (edges, corners, etc. ); further addition of Fe species decreased the low-frequency band, which is possibly interpreted by the dilution effect of Fe species on Ir species and suggested strong interactions. In contrast, the band of CO adsorption was reported to be less changed in the case of Ir/SiO 2 by increasing the Ir loading (5–20 wt %). , As for trimetallic catalysts (Ir–Fe 0.13 –Mo/BN, 20 wt % Ir, Mo/Ir = 0–0.3), the addition of Mo species led to a slight red shift of the CO band of Ir–Fe 0.13 /BN (20 wt % Ir), indicating a modification effect and suggesting the electron transfer from Mo to Ir.…”

Section: Resultsmentioning

confidence: 90%

“…For Ir/BN (5 wt % Ir), the bands at 2000–2083 cm –1 are mainly related to linearly adsorbed CO on metallic Ir species; the main adsorption signal at about 2080 cm –1 is assigned to the CO adsorbed on the high-coordinated Ir 0 species (the crystal plane) and the lower shoulder peak is related to the low-coordinated Ir 0 species (edges, corners, etc.) . The addition of Fe species resulted in the red shift, which suggested the presence of an Ir–Fe alloy. , Increasing the loading amount of Ir species (Ir: 5 → 20 wt %) led to an increase in the low-frequency CO band (∼2040 cm –1 ) in Ir/BN, suggesting the presence of more low-coordinate sites (edges, corners, etc.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Highly Efficient Iridium–Iron–Molybdenum Catalysts Condensed on Boron Nitride for Biomass-Derived Diols’ Hydrogenolysis to Secondary Monoalcohols

Liu,

Nakagawa,

Yabushita

et al. 2024

J. Am. Chem. Soc.

View full text Add to dashboard Cite

A trade-off of activity−selectivity exists in primary C−O hydrogenolysis of biomass-derived diols to secondary alcohols over bimetallic catalysts, especially the combination of noble metal and early transition metal in the metallic state and metal oxide state, respectively. Herein, the combination of high surface concentration of boron nitride (BN)-supported metals and the addition of Mo as third metal broke the trade-off. High yields (>50%) of secondary alcohols were obtained with robust productivity up to 25-fold based on Ir over Ir−Fe 0.13 −Mo 0.08 /BN (Ir = 20 wt %, Fe/Ir = 0.13, Mo/Ir = 0.08) than previously reported Ir−Fe catalysts. In contrast, simply increasing the loading amount of Ir−Fe catalysts or the addition of Mo species only enhanced the productivity by <2−4-fold. Various characterizations showed that large Ir loading enables the formation of condensed nanostructures (∼2 nm) on the BN support, which further alloy with Mo and Fe to form an face centred cubic (fcc)-type trimetallic alloy with surface enrichment of Fe. On the other hand, in Ir− Fe 0.25 −Mo 0.08 /BN with lower Ir (5 wt %) and lower Ir-based activity, the Mo species were rather bound on the support surface possibly as the MoB x state. These structures were formed by simple impregnation and reduction with H 2 at the reaction temperature (453 K). The high activity of Ir−Fe 0.13 −Mo 0.08 /BN (20 wt % Ir) is derived from two aspects: (1) the formation of condensed nanostructures (∼2 nm) exposing more active sites and (2) alloying with Mo to modify the electronic state of Ir to enhance the H 2 activation ability, as shown by the decreased E a (82−84 → 67 kJ mol −1 ).

show abstract

Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Highly Efficient Iridium–Iron–Molybdenum Catalysts Condensed on Boron Nitride for Biomass-Derived Diols’ Hydrogenolysis to Secondary Monoalcohols

Liu,

Nakagawa,

Yabushita

et al. 2024

J. Am. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…A. Jia et al (2023) reported the selective hydrogenation of crotonaldehyde (CROL) over Ir/TiO 2 catalyst. They studied the effect of metal size, from single atoms to nanoclusters (NC) to nanoparticles (NP), on the selective hydrogenation of this compound.…”

Section: Hydrogenation Reactionsmentioning

confidence: 99%

Small but mighty: unlocking the catalytic power of individual iridium atoms on titanium oxide

Molina-Torres,

Hernández-Cristóbal,

Mendoza-Cruz

2023

Front. Nanotechnol.

View full text Add to dashboard Cite

show abstract

Theoretical evidence on pyridinic nitrogen in N, S-coordinated Co single atom catalyst as dominant active site promoting H2 cleavage, H diffusion, and hydrogenation activity

Lv,

Xue,

Zhang

et al. 2024

Journal of Catalysis

View full text Add to dashboard Cite

Selective hydrogenation of crotonaldehyde over Ir/TiO2 catalysts: Unraveling the metal-support interface related reaction mechanism

Cited by 4 publications

References 71 publications

Highly Efficient Iridium–Iron–Molybdenum Catalysts Condensed on Boron Nitride for Biomass-Derived Diols’ Hydrogenolysis to Secondary Monoalcohols

Highly Efficient Iridium–Iron–Molybdenum Catalysts Condensed on Boron Nitride for Biomass-Derived Diols’ Hydrogenolysis to Secondary Monoalcohols

Small but mighty: unlocking the catalytic power of individual iridium atoms on titanium oxide

Theoretical evidence on pyridinic nitrogen in N, S-coordinated Co single atom catalyst as dominant active site promoting H2 cleavage, H diffusion, and hydrogenation activity

Contact Info

Product

Resources

About