Methanol oxidation reaction on Ce1-xPtxO2-δ and Pt0 particles supported on Ce-modified MWCNTs

Martinez-Tovar, C.F.; Pacheco‐Espinoza, Sarahi; Cuesta‐Balderas, Alejandro I.; Vázquez‐Lujano, Jorge; Cabrera-Sierra, R.; Chen, F.; Shen, Qiang; Rong, T.; Manzo-Robledo, A.; Vargas-Garcı́a, J.R.; Zhang, L.

doi:10.1016/j.apsusc.2020.146253

Cited by 8 publications

(4 citation statements)

References 39 publications

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“…In our previous experiments, Pt supported on CeO 2‐δ NTs 300 has proved to be highly efficient in the electro‐oxidation of methanol because of the notable presence of surface O vacancies at the support material. [ 42 ] In a divergent way, OCe(IV) signal from CeO 2‐δ NTs 500 shows a shift to lower BE's, presumably connected to their distinctive 1D morphology in combination with their extraordinarily high concentration of O vacancies at fluorite lattice.…”

Section: Resultsmentioning

confidence: 99%

Topotactical Route to Multiwalled Cerium Oxide Nanotubes from MWCNTs

Pacheco‐Espinoza

Cuesta‐Balderas

Vázquez‐Lujano

et al. 2023

Part & Part Syst Charact

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biomedicine due to its ability to shift easily between Ce 4+ /Ce 3+ oxidation states, high oxygen storage capacity (OSC), increased oxygen ion conductivity, and excellent biocompatibility. [1,2] Over the years, extensive research efforts have been made to develop the controllable synthesis of CeO 2 nanomaterials with diverse structural morphologies owing to the importance of nano-size and geometrical effects. [3,4] Due to their inherent hollow structure, CeO 2 nanotubes possess a high surfaceto-volume ratio, which gives them active surface chemistry attributed to oxygen vacancies. Compared to 1D solid counterparts, CeO 2 nanotubes are more challenging to prepare since they demand a suitable strategy to develop the hollow structure. [5,6] Various soft-chemical methods have been investigated to prepare CeO 2 nanotubes. Methods include template-free and structural directingtemplate syntheses, the second being the most effective way to yield the hollow structure. Different growth mechanisms have been proposed by several research groups. Table S1 (Supporting Information) summarizes the synthesis methods, growth mechanisms, templates, and crystalline nature reported in the literature for CeO 2 nanotubes. Typical features of nanotubes include uniform wall thickness, diameters ranging from 10 to 500 nm, and lengths up to several micrometers. Often, nanotube walls are constituted by small crystallites with a random orientation. In some instances, however, crystalline regions show (111) preferred orientation, i.e., the stable CeO 2 (111) planes are preferentially exposed on nanotube-curved surfaces. The CeO 2 (111) is a Tasker type 2 surface, consisting of a repeating sequence of O-Ce-O trilayer units (3.1 Å in height) along [111] direction. [7,8] Atomistic simulations have demonstrated the structural stability of multiwalled CeO 2 nanotubes organized in a concentric circular configuration of OCeO units. [9] Moreover, simulations have indicated that the O vacancy cluster is more stable at the nanotube (111) outer surface than over a (111) flat surface. The presence of oxygen vacancies on the (111) surface is essential for enhancing the activity of CeO 2 . [10] However, continuous multiwalled arrangement along the tube axis to harness the benefits of a large curved CeO 2 ( 111) surface remains challenging. The MWCNTs as structural directing-template have been demonstrated to be effective in promoting uniform The development of new strategies for synthesizing 1D cerium oxide (CeO 2 ) hollow nanostructures has attracted much attention in recent years due to the importance of their superior properties and highly anisotropic geometry. This study reports an unpublished route of fabricating novel multiwalled CeO 2-δ nanotubes (CeO 2-δ NTs) in which the entire volume of functionalized multiwalled carbon nanotubes (f-MWCNTs) is converted into the CeO 2-δ pseudomorph through oxidation and dehydration topotactic reactions. The stable CeO 2-δ (111) planes are topotactically grown on the curved C (002) planes, preferentially expose...

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Section: Resultsmentioning

confidence: 99%

Topotactical Route to Multiwalled Cerium Oxide Nanotubes from MWCNTs

Pacheco‐Espinoza

Cuesta‐Balderas

Vázquez‐Lujano

et al. 2023

Part & Part Syst Charact

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“…The ratio of them was also summarized in Table 1 . It is generally agreed that the higher concentration of Ce 3+ is conducive to the formation of surface Vö, which is considered an asset for the VOCs catalytic reaction [26,39].…”

Section: Surface Elemental Composition and Oxygen Species Of Powdered...mentioning

confidence: 99%

Monolithic catalysts for the combustion of dichloromethane: effect of coating method, catalyst support, and additives

Fu,

Su,

Yang

et al. 2024

Preprint

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Supported Pt catalysts were considered to have excellent activity and stability in the catalytic combustion of chlorinated VOCs, which, however, face challenges on the transformation to pilot application. Herein, we prepared a series of Pt catalysts and coated them on honeycomb cordierites uniformly to prepared monolithic catalysts. The effects of different coating methods (washcoating, one-pot synthesis, or impregnation), supports (TiO2 or HZSM-5) and additives (Co3O4 or CeO2) on the catalytic performance were investigated. The advantage of the washcoating method is that the active phase of catalysts worked as a unit, which means a stronger interaction between them. In this research, the Pt-Co/HZSM-5 prepared by the washcoating method exhibited the best activity in the catalytic oxidation of dichloromethane (T50=260 ºC and T90=335 ºC) and showed stability for at least 48 hours (at 90% conversion). Such an excellent performance was attributed to the abundant Oads species and high BET surface area.

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“…To demonstrate the distinct difference in catalytic performance between the new type of catalyst, designated as a catalyst of singly dispersed bimetallic sites, a catalyst of isoalted single-atom bimetallic sites, or a catalyst of singly dispersed single-atom bimetallic sites, M 1 A n /X-Z, and a conventional bimetallic nanoparticle catalyst (M-A), here Pt and Zn are chosen for preparing singly dispersed single-atom bimetallic sites, Pt 1 Zn n on a nonmetallic support. Methanol partial oxidation (MPO) producing hydrogen was chosen as a probing reaction since a supported Pt catalyst is active for the methanol partial oxidation. − As detailed in the section of Results and Discussion, these cationic, singly dispersed bimetallic sites, Pt 1 Zn 3 exhibit an activity much higher than that of Pt–Zn bimetallic nanoparticles supported on ZnO several hundred times, and a high selectivity of nearly 100% for producing H 2 through methanol partial oxidation. Our computational studies rationalized the difference in catalytic performance between the new type of catalyst, Pt 1 Zn 3 /ZnO and the Pt–Zn bimetallic nanoparticle catalyst by simulations of the reaction pathways of methanol partial oxidation on the two catalysts.…”

Section: Introductionmentioning

confidence: 99%

Breaking Continuously Packed Bimetallic Sites to Singly Dispersed on Nonmetallic Support for Efficient Hydrogen Production

Jiang,

Li,

Tang

et al. 2024

ACS Appl. Mater. Interfaces

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We have synthesized Pt 1 Zn 3 /ZnO, also termed 0.01 wt %Pt/ZnO-O 2 − H 2 , as a catalyst containing singly dispersed single-atom bimetallic sites, also called a catalyst of singly dispersed bimetallic sites or a catalyst of isolated single-atom bimetallic sites. Its catalytic activity in partial oxidation of methanol to hydrogen at 290 °C is found to be 2−3 orders of magnitude higher than that of Pt−Zn bimetallic nanoparticles supported on ZnO, 5.0 wt %Pt/ZnO-N 2 −H 2 . Selectivity for H 2 on Pt 1 Zn 3 /ZnO reaches 96%−100% at 290−330 °C, arising from the uniform coordination environment of single-atom Pt 1 in singly dispersed single-atom bimetallic sites, Pt 1 Zn 3 on 0.01 wt %Pt/ZnO-O 2 −H 2 , which is sharply different from various coordination environments of Pt atoms in coexisting Pt x Zn y (x ≥ 0, y ≥ 0) sites on Pt− Zn bimetallic nanoparticles. Computational simulations attribute the extraordinary catalytic performance of Pt 1 Zn 3 /ZnO to the stronger adsorption of methanol and the lower activation barriers in O−H dissociation of CH 3 OH, C−H dissociations of CH 2 O to CO, and coupling of intermediate CO with atomic oxygen to form CO 2 on Pt 1 Zn 3 /ZnO as compared to those on Pt−Zn bimetallic nanoparticles. It demonstrates that anchoring uniform, isolated single-atom bimetallic sites, also called singly dispersed bimetallic sites on a nonmetallic support can create new catalysts for certain types of reactions with much higher activity and selectivity in contrast to bimetallic nanoparticle catalysts with coexisting, various metallic sites M x A y (x ≥ 0, y ≥ 0). As these singleatom bimetallic sites are cationic and anchored on a nonmetallic support, the catalyst of singly dispersed single-atom bimetallic sites is different from a single-atom alloy nanoparticle catalyst. The critical role of the 0.01 wt %Pt in the extraordinary catalytic performance calls on fundamental studies of the profound role of a trace amount of a metal in heterogeneous catalysis.

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Methanol oxidation reaction on Ce1-xPtxO2-δ and Pt0 particles supported on Ce-modified MWCNTs

Cited by 8 publications

References 39 publications

Topotactical Route to Multiwalled Cerium Oxide Nanotubes from MWCNTs

Topotactical Route to Multiwalled Cerium Oxide Nanotubes from MWCNTs

Monolithic catalysts for the combustion of dichloromethane: effect of coating method, catalyst support, and additives

Breaking Continuously Packed Bimetallic Sites to Singly Dispersed on Nonmetallic Support for Efficient Hydrogen Production

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