PtMo Bimetallic Catalysts Synthesized by Controlled Surface Reactions for Water Gas Shift

Şener, Canan; Wesley, Thejas S.; Alba, Ana Carolina; Kumbhalkar, Mrunmayi D.; Hakim, Sikander H.; Ribeiro, Fabio H.; Miller, Jeffrey T.; Dumesic, James A.

doi:10.1021/acscatal.5b02028

Cited by 40 publications

(31 citation statements)

References 43 publications

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“…Recently reported methods for the synthesis of bimetallic nanoparticles with precise surface compositions using strong electrostatic adsorption and controlled surface reactions should further improve understanding, performance and applications of Pt–Mo catalytic structures. For comparison, the saturation limit for Mo on the surface of Pt–Mo nanoparticles prepared by controlled surface reactions was found at a Mo to Pt ratio of 0.32 based on water‐gas shift reaction testing, in line with the maximum acetic acid activity for the Pt–Mo 1/3 composition in Figure . Special properties of Pt nanoparticles decorated with Mo clusters will, therefore, be useful in the development of improved catalysts for a wide variety of reactions that require a transformation of molecules with an oxygen atom, including biomass processing, water‐gas shift, reverse water‐gas shift, deoxygenation of oxygenated aromatics, ethanol oxidation in fuel cells, and aqueous phase glycerol reforming .…”

Section: Figuresupporting

confidence: 65%

“…For comparison, the saturation limit for Mo on the surface of Pt–Mo nanoparticles prepared by controlled surface reactions was found at a Mo to Pt ratio of 0.32 based on water‐gas shift reaction testing, in line with the maximum acetic acid activity for the Pt–Mo 1/3 composition in Figure . Special properties of Pt nanoparticles decorated with Mo clusters will, therefore, be useful in the development of improved catalysts for a wide variety of reactions that require a transformation of molecules with an oxygen atom, including biomass processing, water‐gas shift, reverse water‐gas shift, deoxygenation of oxygenated aromatics, ethanol oxidation in fuel cells, and aqueous phase glycerol reforming . By allowing tuning of surface–oxygen interactions, Pt–Mo nanoparticles have the potential of being useful in multiple areas beyond catalysis, for example in sensing and biomedical applications.…”

Section: Figuresupporting

confidence: 65%

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Catalytic Platinum Nanoparticles Decorated with Subnanometer Molybdenum Clusters for Biomass Processing

Zheng

Tang

Podkolzin

2020

Chemistry A European J

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The development of improved technologies for biomass processing into transportation fuels and industrial chemicals is hindered due to al ack of efficient catalysts for selectiveo xygen removal.H ere we report that platinum nanoparticles decorated with subnanometer molybdenum clusters can efficiently catalyzeh ydrodeoxygenation of acetica cid, which serves as am odel biomass compound. In contrast with monometallic Mo catalysts that are inactive and monometallic Pt catalysts that have low activities and selectivities, bimetallic Pt-Mo catalysts exhibit synergistic effects with high activities and selectivities. The maximum activity occurs at aP tt oM om olar ratio of three. Although Mo atoms themselvesa re catalytically inactive, they serve as preferentialb inding anchors for oxygen atoms while ac atalytic transformation proceeds on neighboring surfaceP ta toms. Beyond biomass processing, Pt-Mo nanoparticles are promisingc atalysts for aw ide variety of reactionst hat requireatransformation of molecules with an oxygen atom and, more broadly, in other fieldso fs cience and technology that require tuning of surface-oxygen interactions.Promising new technologiesf or biomassc onversion into fuels and chemical feedstocks rely on production of bio-oils, which need to be upgraded to removeo xygen-containing hydrocarbons (oxygenates) andw ater. [1] In contrast with fossil fuels that are usually contaminatedw ith sulfur and nitrogen-containing compounds but are free of oxygenates,a ll biomass contains oxygen. Removalo fo xygenates is required because ah igh oxygen concentration makes bio-oils acidic and corrosive, unstable during storage, and less energetically valuable per unit weightt han petroleum-derived hydrocarbons. Althoughe fficient pyrolysis and liquefaction processes have been recently developed for the production of bio-oils,o xygen removal from these bio-oils remains challenging. Current technologies for removingo xygen in the presence of hydrogen (hydrodeoxygenation) rely mostly on traditionalp etroleum refining catalysts, which are not optimizedf or biomass processing and, as a result, suffer from insufficienta ctivity, selectivitya nd stability. More efficientu pgrading technologiesa re, therefore, needed for the developmento fs ustainable energy and chemical resources. [1b, d-f] Among major oxygenate types in bio-oils, carboxylic acids are some of the most challenging because their hydrodeoxygenationr ates are usuallya no rder of magnitudel ower. [2] Therefore, acetic acid, the simplest carboxylic acid, is often used as am odel compound in the development of new hydrodeoxygenation processes. [2a,c, 3] Furthermore, acetic acid itself is as ignificant component of bio-oils with ac oncentration from typically5 -8 wt % [1d, 4] to as high as 32 wt %, depending on the type of the initial biomass. [5] In the development of improved catalysts, multiple metals, supports and reaction conditions were evaluated for acetic acid hydrodeoxygenation. For example, in additiont ot raditionals ulfidedN ia nd Mo-based ca...

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Section: Figuresupporting

confidence: 65%

Section: Figuresupporting

confidence: 65%

Catalytic Platinum Nanoparticles Decorated with Subnanometer Molybdenum Clusters for Biomass Processing

Zheng

Tang

Podkolzin

2020

Chemistry A European J

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“…The EXAFS fitting method reported in the literature was used to differentiate Pt-Pt and Pt-Mo bonds [27,28].…”

Section: Xafs and Tem-stem Measurementsmentioning

confidence: 99%

Pt/Mo2C/C-cp as a highly active and stable catalyst for ethanol electrooxidation

Lin

Sheng

Yao

et al. 2017

Journal of Power Sources

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A Pt/Mo 2 C/C-cp electrocatalyst with optimized Pt-Mo 2 C chemical bonding is synthesized and evaluated for the ethanol oxidation reaction (EOR). The chemical bonding of Mo 2 C to Pt particles renders exceptional EOR activity at low potentials, which is 15 and 2.5 times higher than Pt/C and commercial 40% PtRu/C, respectively, at 0.6 V (vs. RHE). The stability of the Pt/Mo 2 C/C-cp electrocatalyst is comparable to the commercial 40% PtRu/C catalyst. CO stripping test demonstrates the existence of highly active sites for CO oxidation on the Pt/Mo 2 C/C-cp catalyst. In-situ infrared spectroscopic studies of EOR reveal that the excellent anti-poisoning ability of the Pt/Mo 2 C/C-cp catalyst is related to the relatively weak binding of carbonyl intermediates over the Pt/Mo 2 C/C-cp catalysts.

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“…It is reported that a variety of transition metals has exhibited their distinct methanation activity, such as Ni, Ru, Rh, Pd and Pt [9]. Meanwhile, another group of transition metals performs well in WGS, including Mo [10], Fe [11], Co [12], Mn [13,14] and Cr [15]. However, for the specific WGS plus methanation unit, it is necessary to develop a novel catalyst, which can simultaneously catalyze WGS and the methanation reaction.…”

Section: Co H O → Comentioning

confidence: 99%

The Synergy Effect of Ni-M (M = Mo, Fe, Co, Mn or Cr) Bicomponent Catalysts on Partial Methanation Coupling with Water Gas Shift under Low H2/CO Conditions

et al. 2017

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Ni-M (M = Mo, Fe, Co, Mn or Cr) bicomponent catalysts were prepared through the co-impregnation method for upgrading low H 2 /CO ratio biomass gas into urban gas through partial methanation coupling with water gas shift (WGS). The catalysts were characterized by N 2 isothermal adsorption, X-ray diffraction (XRD), H 2 temperature programmed reduction (H 2 -TPR), H 2 temperature programmed desorption (H 2 -TPD), scanning electron microscopy (SEM) and thermogravimetry (TG). The catalytic performances demonstrated that Mn and Cr were superior to the other three elements due to the increased fraction of reducible NiO particles, promoted dispersion of Ni nanoparticles and enhanced H 2 chemisorption ability. The comparative study on Mn and Cr showed that Mn was more suitable due to its smaller carbon deposition rate and wider adaptability to various H 2 /CO and H 2 O/CO conditions, indicating its better synergy effect with Ni. A nearly 100 h, the lifetime test and start/stop cycle test further implied that 15Ni-3Mn was stable for industrial application.

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PtMo Bimetallic Catalysts Synthesized by Controlled Surface Reactions for Water Gas Shift

Cited by 40 publications

References 43 publications

Catalytic Platinum Nanoparticles Decorated with Subnanometer Molybdenum Clusters for Biomass Processing

Catalytic Platinum Nanoparticles Decorated with Subnanometer Molybdenum Clusters for Biomass Processing

Pt/Mo2C/C-cp as a highly active and stable catalyst for ethanol electrooxidation

The Synergy Effect of Ni-M (M = Mo, Fe, Co, Mn or Cr) Bicomponent Catalysts on Partial Methanation Coupling with Water Gas Shift under Low H2/CO Conditions

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