Atomically dispersed Ptn+ species as highly active sites in Pt/In2O3 catalysts for methanol synthesis from CO2 hydrogenation

Han, Zhe; Chun, Tang; Wang, Jijie; Li, Landong; Li, Can

doi:10.1016/j.jcat.2020.06.018

Cited by 136 publications

(92 citation statements)

References 47 publications

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“…A similar mechanism of metal promotion was reported for other metal-promoted In 2 O 3 catalysts. 42 , 43 , 49 , 77 For example, a detailed study from Perez-Ramirez’s group 43 emphasized the role of finely dispersed Pd clusters in the H 2 activation and the role of H atoms in the following hydrogenation steps of adsorbed CO 2 . We also briefly discuss here our results in comparison to those recently reported by Frei et al, who prepared Ni/In 2 O 3 catalysts by dry impregnation.…”

Section: Resultsmentioning

confidence: 99%

Ni–In Synergy in CO₂ Hydrogenation to Methanol

et al. 2021

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Indium oxide (In 2 O 3 ) is a promising catalyst for selective CH 3 OH synthesis from CO 2 but displays insufficient activity at low reaction temperatures. By screening a range of promoters (Co, Ni, Cu, and Pd) in combination with In 2 O 3 using flame spray pyrolysis (FSP) synthesis, Ni is identified as the most suitable first-row transition-metal promoter with similar performance as Pd–In 2 O 3 . NiO–In 2 O 3 was optimized by varying the Ni/In ratio using FSP. The resulting catalysts including In 2 O 3 and NiO end members have similar high specific surface areas and morphology. The main products of CO 2 hydrogenation are CH 3 OH and CO with CH 4 being only observed at high NiO loading (≥75 wt %). The highest CH 3 OH rate (∼0.25 g MeOH /(g cat h), 250 °C, and 30 bar) is obtained for a NiO loading of 6 wt %. Characterization of the as-prepared catalysts reveals a strong interaction between Ni cations and In 2 O 3 at low NiO loading (≤6 wt %). H 2 -TPR points to a higher surface density of oxygen vacancy (O v ) due to Ni substitution. X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, and electron paramagnetic resonance analysis of the used catalysts suggest that Ni cations can be reduced to Ni as single atoms and very small clusters during CO 2 hydrogenation. Supportive density functional theory calculations indicate that Ni promotion of CH 3 OH synthesis from CO 2 is mainly due to low-barrier H 2 dissociation on the reduced Ni surface species, facilitating hydrogenation of adsorbed CO 2 on O v .

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Section: Resultsmentioning

confidence: 99%

Ni–In Synergy in CO₂ Hydrogenation to Methanol

et al. 2021

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“…Han et al reported that 0.5 wt.% dispersion of Pt on In 2 O 3 improved the methanol selectivity from 72% to 91%. 103 Jiang et al synthesized Pd/In 2 O 3 /SBA-15 catalyst to investigate its performance for methanol synthesis from CO 2. The catalyst showed about 12% of CO 2 conversion and 84% of methanol selectivity at 260 C and 40 bar pressure.…”

Section: Palladium-based Catalysts For Methanol Synthesismentioning

confidence: 99%

An insight of CO ₂ hydrogenation to methanol synthesis: Thermodynamics, catalysts, operating parameters, and reaction mechanism

Kanuri

Roy

Chakraborty

et al. 2021

Intl J of Energy Research

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Catalytic hydrogenation of CO 2 to methanol is an exciting avenue to curb the rising CO 2 emissions and generate renewable energy or value-added products.Methanol synthesis via the thermal catalysis route gets increasing emphasis due to its fast kinetics and flexible combination of active components. In the last decade, many studies on CO 2 hydrogenation to methanol have been reported with different kinds of catalysts that have been synthesized and characterized using state-of-the-art surface science tools and techniques. In situ analysis techniques as well as theoretical (eg, density functional theory, Monte Carlo simulations, and Micro-Kinetics modeling) studies have been performed to understand the insights of morphology changes, the interaction of active sites, and the formation of intermediate species under the reaction conditions. In the present review, the advancements on CO 2 to methanol via hydrogenation route have been presented taking into consideration different perspectives spanning across thermodynamic aspects, the influence of reaction temperature, pressure, feed composition, space-velocity, and morphologically tuned novel catalyst on CO 2 conversion and methanol selectivity. Among the reported catalysts, the Al 2 O 3 -supported Cu-Zn catalyst showed better performance with 25% CO 2 conversion and 73% methanol selectivity at 170 C and 50 bar pressure. The CeO 2 -supported Pd-Zn catalyst showed 14% CO 2 conversion and 97% methanol selectivity at 220 C under 20 bar pressure. Also, CeO 2nanorods supported Cu-Ni catalyst showed good performance at 260 C and 30 bars, with around 18% CO 2 conversion and 73% methanol selectivity. Addi-

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“…[4][5][6][7][8][9] Initiated by this seminal work, the nomenclature of SACs (M 1 /Support) has become widely accepted, which sparked researchers' interest and boosted extensive studies. [10][11][12][13][14][15][16][17][18][19][20] It has been proved that synthesis approaches play crucial roles in determining the properties of SACs, such as crystallinity, composition, morphology, pore structure and valence states, which eventually contributes to the performance of SACs.…”

Section: Introductionmentioning

confidence: 99%