Influence of pretreatment conditions on low-temperature CO oxidation over Pd supported UiO-66 catalysts

Bi, Fukun; Zhang, Xiaodong; Du, Quanxin; Yue, Ke; Wang, Ruizhuo; Li, Fēi; Liu, Ning; Huang, Yuandong

doi:10.1016/j.mcat.2021.111633

Cited by 50 publications

(15 citation statements)

References 57 publications

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“…Carbon monoxide is a harmful pollutant [1][2][3], especially indoors or inside vehicle cabins, and many efforts have been devoted to oxidize CO to CO 2 at low temperatures. Au and Pt-based catalysts are particularly active at room temperature, and promoted by the presence of moisture [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Stability of Pt-Adsorbed CO on Catalysts for Room Temperature-Oxidation of CO

et al. 2022

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A large signal of gas-phase CO overlapping with those of adsorbates is often present when investigating catalysts by operando diffuse reflectance FT-IR spectroscopy. Physically removing CO(g) from the IR cell may lead to a fast decay of adsorbate signals. Our work shows that carbonyls adsorbed on metallic Pt sites fully vanished in less than 10 min at 30 °C upon removing CO(g) when redox supports were used. In contrast, a broad band assigned to CO adsorbed on oxidized Pt sites was stable. It was concluded that physically removing CO(g) at room temperature during IR analyses will most likely lead to changes in the distribution of CO(ads) and a misrepresentation of the Pt site speciation, misguiding the development of efficient low-temperature CO oxidation catalysts. A tentative representation of the nature of the Pt phases present depending on the feed composition is also proposed.

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Section: Introductionmentioning

confidence: 99%

Stability of Pt-Adsorbed CO on Catalysts for Room Temperature-Oxidation of CO

et al. 2022

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“…Metal–organic frameworks (MOFs), connected by inorganic clusters and organic ligands, exhibit the advantage of adjustable pore structure and chemical property. In the past two decades, MOFs exhibited large potential in many fields, such as adsorption, separation, and catalysis. − In particular, water-stable MOFs with rich active sites have been widely used for water-phase adsorption and separation of metal ions. − However, to the best of our knowledge, the works on Dy 3+ adsorption in MOFs are rarely reported to date. Micropore adsorption is considered an effective mode for metal ions, where adjacent active groups are closer, which is beneficial for the synergic effect.…”

Section: Introductionmentioning

confidence: 99%

Rationally Tailoring Pore and Surface Properties of Metal–Organic Frameworks for Boosting Adsorption of Dy³⁺

Pei

Zhao

Liu

et al. 2021

ACS Appl. Mater. Interfaces

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The adsorption and recovery of dysprosium ions (Dy3+) from industrial wastewater are necessary but still challenging. Herein, we constructed a series of defect-containing metal–organic frameworks (MOFs) [UiO-66-(COOH)2] using sodium benzoate (BCNa) as a modulator. Upon the formation of defects, the porosity and surface charge properties of the MOFs were improved, leading to a higher utilization ratio of active groups and higher adsorption capacities for Dy3+. The synthesized UiO-66-(COOH)2-B10 with an optimal addition of BCNa exhibited a superior adsorption capacity of 150.6 mg g–1. Fast adsorption occurred at ∼5 min, and equilibrium was reached at ∼60 min. Higher pH and temperature were found to be beneficial for boosting Dy3+ adsorption, and selective adsorption over other metal ions was achieved in a multicomponent solution. Further, FTIR spectroscopy and XPS investigations indicate that free carboxyl contributes to the capture of Dy3+. Thus, this work provides a promising strategy to enhance the utilization ratio of active groups and further adsorption performance.

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“…Metal–organic frameworks, constructed through coordination bonding metal ions (or clusters) with various organic molecules, are one kind of nanoporous crystalline materials. MOF materials have many outstanding properties, such as structural and chemical diversities, easy modification, controllable nanopore size, and high specific surface area, which allow them to be widely used in adsorption, catalysis, , and photocatalysis. , Recently, conductive MOFs have aroused intensive interest. Ionic conductive MOFs have exhibited great potential in fuel cells, − supercapacitors, − and sensors. , Especially, the proton conductivity of MOFs has increased by producing more protons and/or enhancing carrier mobility. − ,, However, hydroxide ion conductive MOFs, which are important in alkaline fuel cells, have scarcely been reported. − Moreover, apart from the improvement of proton/ionic conduction in nanoporous MOFs, external control of the conductivity of MOFs, especially by light, is very attractive. − Light-gated reversible conductive MOFs are deemed as promising nanoporous materials for photoelectric sensors, , biological mimic system, and other smart devices. − For instance, the proton conduction, remote-controlled by light, was achieved by using photosensitive azobenzene groups and surface-mounted MOFs .…”

Section: Introductionmentioning

confidence: 99%

“…Metal−organic frameworks, constructed through coordination bonding metal ions (or clusters) with various organic molecules, are one kind of nanoporous crystalline materials. MOF materials have many outstanding properties, such as structural and chemical diversities, easy modification, controllable nanopore size, and high specific surface area, which allow them to be widely used in adsorption, 1 catalysis, 2,3 and photocatalysis. 4,5 Recently, conductive MOFs have aroused intensive interest.…”

Section: ■ Introductionmentioning

confidence: 99%

NH₂-UiO-66 Metal–Organic Framework Nanoparticles for Hydroxide Ion Conductive Photoswitches

Wang

Fan

Zhou

et al. 2021

ACS Appl. Nano Mater.

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Stimuli-responsive conductive MOF nanoporous materials have been considered to have great potential for photoelectric conversion, information processing, bioelectronics, and smart devices. However, lightregulating hydroxide ion conduction of MOFs is rarely reported. Herein, a reversible optical switch on hydroxide ion conduction has been achieved based on the intrinsic localized photothermal heating of NH 2 -UiO-66 nanoparticles. The amino group on the organic ligand of NH 2 -UiO-66 can build a hydrogen-bond network with water molecules to promote hydroxide ion transport in the nanochannel and cause an absorption band in the visible light region. Irradiated by visible light, NH 2 -UiO-66 nanoparticles can absorb light and convert it into heat, resulting in partial removal of water molecules in the nanopores and destroying the hydroxide ion transport path. Then, the hydroxide ion conductivity decreased by 2 orders of magnitude. When turning off the light, the hydroxide ion conductivity can restore quickly. This work will promote the development of remotely controlled hydroxide ion conductive smart devices.

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Influence of pretreatment conditions on low-temperature CO oxidation over Pd supported UiO-66 catalysts

Cited by 50 publications

References 57 publications

Stability of Pt-Adsorbed CO on Catalysts for Room Temperature-Oxidation of CO

Stability of Pt-Adsorbed CO on Catalysts for Room Temperature-Oxidation of CO

Rationally Tailoring Pore and Surface Properties of Metal–Organic Frameworks for Boosting Adsorption of Dy³⁺

NH₂-UiO-66 Metal–Organic Framework Nanoparticles for Hydroxide Ion Conductive Photoswitches

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Influence of pretreatment conditions on low-temperature CO oxidation over Pd supported UiO-66 catalysts

Cited by 50 publications

References 57 publications

Stability of Pt-Adsorbed CO on Catalysts for Room Temperature-Oxidation of CO

Stability of Pt-Adsorbed CO on Catalysts for Room Temperature-Oxidation of CO

Rationally Tailoring Pore and Surface Properties of Metal–Organic Frameworks for Boosting Adsorption of Dy3+

NH2-UiO-66 Metal–Organic Framework Nanoparticles for Hydroxide Ion Conductive Photoswitches

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Product

Resources

About

Rationally Tailoring Pore and Surface Properties of Metal–Organic Frameworks for Boosting Adsorption of Dy³⁺

NH₂-UiO-66 Metal–Organic Framework Nanoparticles for Hydroxide Ion Conductive Photoswitches