Electronic Modification by Transitional Metal Dopants to Tune the Oxidation Activity of Pt-CeO<sub>2</sub>-Based Catalysts

Zhang, Jianghao; Shan, Ruoting; Xiao, Hongfei; Hu, Shuo; Sheng, Zhenteng; Qin, Xiaoxiao; Zhang, Yuhua; Wang, Li; Li, Jinlin; Zhang, Changbin

doi:10.1021/acs.est.2c07099

Cited by 20 publications

(21 citation statements)

References 48 publications

(76 reference statements)

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“…Pt 4f XPS spectra are shown in Figure S10c. The spectra for samples contained contributions from Pt 2+ and Pt 4+ species, located at 72.5 and 74.4 eV, respectively. , And the ratio of Pt 4+ /Pt 2+ was calculated and listed in Table S5. For Pt/Fe 2 O 3 -Q, the ratio of Pt 4+ /Pt 2+ was larger than that for Pt/Fe 2 O 3 -S, evidencing a higher oxidation state of Pt on Pt/Fe 2 O 3 -Q.…”

Section: Resultsmentioning

confidence: 99%

Quenching-Induced Defect-Rich Platinum/Metal Oxide Catalysts Promote Catalytic Oxidation

Chong

Chen

et al. 2023

Environ. Sci. Technol.

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Enhancing oxygen activation through defect engineering is an effective strategy for boosting catalytic oxidation performance. Herein, we demonstrate that quenching is an effective strategy for preparing defect-rich Pt/metal oxide catalysts with superior catalytic oxidation activity. As a proof of concept, quenching of α-Fe2O3 in aqueous Pt(NO3)2 solution yielded a catalyst containing Pt single atoms and clusters over defect-rich α-Fe2O3 (Pt/Fe2O3-Q), which possessed state-of-the-art activity for toluene oxidation. Structural and spectroscopic analyses established that the quenching process created abundant lattice defects and lattice dislocations in the α-Fe2O3 support, and stronger electronic interactions between Pt species and Fe2O3 promote the generation of higher oxidation Pt species to modulate the adsorption/desorption behavior of reactants. In situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS) characterization studies and density functional theory (DFT) calculations determined that molecular oxygen and Fe2O3 lattice oxygen were both activated on the Pt/Fe2O3-Q catalyst. Pt/CoMn2O4, Pt/MnO2, and Pt/LaFeO3 catalysts synthesized by the quenching method also offered superior catalytic activity for toluene oxidation. Results encourage the wider use of quenching for the preparation of highly active oxidation catalysts.

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Section: Resultsmentioning

confidence: 99%

Quenching-Induced Defect-Rich Platinum/Metal Oxide Catalysts Promote Catalytic Oxidation

Chong

Chen

et al. 2023

Environ. Sci. Technol.

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“…A lower reduction degree is unfavorable for hydrogen activation, while a higher reduction degree with high electron density can lead to the excessively strong adsorption of imines. Therefore, we highlight the following to consider during the adjustment of the reduction degree of metal sites: (1) alloying to harmonize the electronic structure of metal catalysts, , (2) decorating the metallic species with suitable components having the ability to transfer electrons, − and (3) designing SACs or atomic dispersion metal cluster catalysts with specific average coordination numbers. − …”

Section: Overall Catalyst Design Principlementioning

confidence: 99%

Paving the Way for Reductive Amination: Boosting Catalytic Ammonolysis of Schiff Base

Jia,

Chen,

Jing

et al. 2023

ACS Catal.

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The synthesis of primary amines through reductive/ hydrogen-borrowing amination has garnered significant attention due to their wide application in the chemical industry. The key challenge of the reaction arises from two competing balances: the hydrogenations of primary imine versus Schiff base and the ammonolysis versus hydrogenation of Schiff base. The former has received extensive attention, and the latter, which directly determines the selectivity of primary amine, has recently emerged as a fresh view for enhancing catalytic performance. Thus, gaining insights into promoting the ammonolysis of Schiff base in the latter is becoming increasingly urgent for catalyst design. This Perspective starts by presenting the overall catalyst design principles and mainly discusses the influence of two balances on the selectivity and effective approaches to tackle them. A profound emphasis is placed on advancing the ammonolysis of Schiff bases through an in-depth understanding of structure−activity relationships and reaction mechanisms. Finally, three key directions deserving future investigations are provided. This distinctive view not only enhances the importance of comprehension of structure− activity relationships in primary amine synthesis but also unveils efficient avenues for catalyst design.

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“…6 The removal of indoor air pollutants is mainly achieved via air purifiers with absorption media or air conditioning systems (HVAC). 7 Other methods such as botanical filtration, 8 catalytic oxidation, 9 adsorption, 10 and plasma have also been investigated to abate indoor VOCs. Among these approaches, passive abatement of indoor VOCs over sorbent materials offers a promising approach for IAQ control.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Mixed-Metal Oxide Latex Composite Thin Films for Passive Control of Indoor Formaldehyde

Aina

Adebayo

Newport

et al. 2023

ACS Appl. Eng. Mater.

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This study presents the preparation, characterization, and formaldehyde (HCHO) adsorption performance of hybrid mixed-metal oxide (MMO)− coated latex composites for indoor air quality control. The hybrid MMO−latex composites were prepared by coating a thin layer of TiO 2 /SiO 2 particles onto a latex polymer film using polypropylene glycol (PPG) to aid in uniform deposition of MMO particles via hydrogen bonding, while also providing additional active sites for HCHO adsorption. The effect of PPG content on the HCHO removal performance of the composites in terms of capture capacity and kinetics were systematically investigated. The indoor chamber tests indicated that the HCHO adsorption capacity and kinetics of the composite thin film increased by 36% and 63%, respectively, compared to those of its MMO-incorporated latex analogue under identical conditions. Moreover, our results indicated that upon increasing the PPG content from 0 to 90 wt %, the HCHO adsorption capacity and rate were significantly enhanced from 0.36 to 0.57 mmol/g and 0.01 to 0.14 h −1 , respectively, due to increased affinity and better accessibility to the adsorption active sites in the thin films with uniformly deposited MMO particles. The increase in the humidity level from 45 to 80% RH was also found to promote the rate of HCHO capture by 50%. The findings of this work demonstrate that hybrid MMO−coated latex composites have superior HCHO adsorptive performance compared to their incorporated MMO−latex analogues.

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Electronic Modification by Transitional Metal Dopants to Tune the Oxidation Activity of Pt-CeO₂-Based Catalysts

Cited by 20 publications

References 48 publications

Quenching-Induced Defect-Rich Platinum/Metal Oxide Catalysts Promote Catalytic Oxidation

Quenching-Induced Defect-Rich Platinum/Metal Oxide Catalysts Promote Catalytic Oxidation

Paving the Way for Reductive Amination: Boosting Catalytic Ammonolysis of Schiff Base

Hybrid Mixed-Metal Oxide Latex Composite Thin Films for Passive Control of Indoor Formaldehyde

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Electronic Modification by Transitional Metal Dopants to Tune the Oxidation Activity of Pt-CeO2-Based Catalysts

Cited by 20 publications

References 48 publications

Quenching-Induced Defect-Rich Platinum/Metal Oxide Catalysts Promote Catalytic Oxidation

Quenching-Induced Defect-Rich Platinum/Metal Oxide Catalysts Promote Catalytic Oxidation

Paving the Way for Reductive Amination: Boosting Catalytic Ammonolysis of Schiff Base

Hybrid Mixed-Metal Oxide Latex Composite Thin Films for Passive Control of Indoor Formaldehyde

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Product

Resources

About

Electronic Modification by Transitional Metal Dopants to Tune the Oxidation Activity of Pt-CeO₂-Based Catalysts