Promoted C–C bond cleavage over intermetallic TaPt3 catalyst toward low-temperature energy extraction from ethanol

2015 ◽  
Vol 8 (6) ◽  
pp. 1685-1689 ◽  
Author(s):  
Rajesh Kodiyath ◽  
Gubbala V. Ramesh ◽  
Eva Koudelkova ◽  
Toyokazu Tanabe ◽  
Mikio Ito ◽  
...  
Keyword(s):  
Low Temperature ◽  
Bond Cleavage ◽  
Catalytic Performance ◽  
Energy Extraction ◽  
Ethanol Electrooxidation

Intermetallic TaPt3 nanoparticles promote C–C bond cleavage in ethanol and exhibit much higher catalytic performance than traditional catalysts for the ethanol electrooxidation.

On the Lack of Beneficial Role of Rh Towards C-C Bond Cleavage During Low Temperature Ethanol Electrooxidation on Pt-Rh Nanoalloys

2018 ◽  
Author(s):  
Justyna Piwowar ◽  
Adam Lewera
Keyword(s):  
Low Temperature ◽  
Electrode Potential ◽  
Ethanol Oxidation ◽  
Bond Cleavage ◽  
Ethanol Electrooxidation ◽  
Co Stripping ◽  
Beneficial Role ◽  
Bond Scission ◽  
Oxidation Of Ethanol

Numerous reports in scientific literature claim the increased activity of Rh-containing systems towards C-C bond scission in electrocatalytic oxidation of ethanol at ambient temperatures. Due to the claimed C-C bond breaking ability, Rh-containing systems are intensively investigated and widely recognized as the most promising candidates as anode materials for ethanol-feed low temperature fuel cells. This study aims at verifying the claim of beneficial role of Rh towards C-C bond scission during low temperature ethanol electrooxidation on Pt-Rh nanoparticles. We determined that the surface-normalized amounts of CO<sub>2 </sub>produced during ethanol oxidation are comparable on Pt, Rh and Pt-Rh nanoalloys, and smaller than CO<sub>2</sub> amounts obtained on exactly the same electrode from oxidation of monolayer of adsorbed CO. The whole amount of CO<sub>2</sub> detected during ethanol oxidation, regardless of Rh presence, or lack of thereof, seems to come exclusively from oxidation of submonolayer of CO<sub>ads</sub> produced during dissociative adsorption of ethanol at low electrode potential, and its subsequent oxidation at sufficiently high electrode potential. Our work suggest that Rh-containing alloys are not more active towards C-C bond scission than pure Pt, and on both metals the mechanism of oxidation of ethanol to CO<sub>2</sub> proceeds via the submonolayer of CO<sub>ads</sub>, which limits the quantity of CO<sub>2</sub> produced from ethanol at room temperature to negligible amount. The higher activity of Rh-containing materials towards C-C bond scission claimed in literature was determined to be due to overinterpretation of selectivity data.<br>To characterized the samples we used techniques like XPS, TEM, and cyclic voltammetry. For drove a conclusions we compere amount of CO<sub>2</sub> detected in DEMS during ethanol oxidation reaction and so called CO stripping experiment. <br><br>

On the Lack of Beneficial Role of Rh Towards C-C Bond Cleavage During Low Temperature Ethanol Electrooxidation on Pt-Rh Nanoalloys

2018 ◽  
Author(s):  
Justyna Piwowar ◽  
Adam Lewera
Keyword(s):  
Low Temperature ◽  
Electrode Potential ◽  
Ethanol Oxidation ◽  
Bond Cleavage ◽  
Ethanol Electrooxidation ◽  
Co Stripping ◽  
Beneficial Role ◽  
Bond Scission ◽  
Oxidation Of Ethanol

Numerous reports in scientific literature claim the increased activity of Rh-containing systems towards C-C bond scission in electrocatalytic oxidation of ethanol at ambient temperatures. Due to the claimed C-C bond breaking ability, Rh-containing systems are intensively investigated and widely recognized as the most promising candidates as anode materials for ethanol-feed low temperature fuel cells. This study aims at verifying the claim of beneficial role of Rh towards C-C bond scission during low temperature ethanol electrooxidation on Pt-Rh nanoparticles. We determined that the surface-normalized amounts of CO<sub>2 </sub>produced during ethanol oxidation are comparable on Pt, Rh and Pt-Rh nanoalloys, and smaller than CO<sub>2</sub> amounts obtained on exactly the same electrode from oxidation of monolayer of adsorbed CO. The whole amount of CO<sub>2</sub> detected during ethanol oxidation, regardless of Rh presence, or lack of thereof, seems to come exclusively from oxidation of submonolayer of CO<sub>ads</sub> produced during dissociative adsorption of ethanol at low electrode potential, and its subsequent oxidation at sufficiently high electrode potential. Our work suggest that Rh-containing alloys are not more active towards C-C bond scission than pure Pt, and on both metals the mechanism of oxidation of ethanol to CO<sub>2</sub> proceeds via the submonolayer of CO<sub>ads</sub>, which limits the quantity of CO<sub>2</sub> produced from ethanol at room temperature to negligible amount. The higher activity of Rh-containing materials towards C-C bond scission claimed in literature was determined to be due to overinterpretation of selectivity data.<br>To characterized the samples we used techniques like XPS, TEM, and cyclic voltammetry. For drove a conclusions we compere amount of CO<sub>2</sub> detected in DEMS during ethanol oxidation reaction and so called CO stripping experiment. <br><br>

CeMn/TiO2 catalysts prepared by different methods for enhanced low-temperature NH3-SCR catalytic performance

2021 ◽  
pp. 116588
Author(s):  
Xianlong Zhang ◽  
Xincheng Zhang ◽  
Xiangjin Yang ◽  
Yazhong Chen ◽  
Xiaorui Hu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Catalytic Performance ◽  
Nh3 Scr

scholarly journals Catalytic Abatement of Volatile Organic Compounds and Soot over Manganese Oxide Catalysts

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4534
Author(s):  
Miguel Jose Marin Figueredo ◽  
Clarissa Cocuzza ◽  
Samir Bensaid ◽  
Debora Fino ◽  
Marco Piumetti ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Low Temperature ◽  
Manganese Oxide ◽  
Organic Compounds ◽  
Catalytic Performance ◽  
Oxide Catalysts ◽  
X Ray ◽  
Manganese Oxide Catalysts ◽  
Volatile Organic ◽  
Temperature Programmed

A set of manganese oxide catalysts was synthesized via two preparation techniques: solution combustion synthesis (Mn3O4/Mn2O3-SCS and Mn2O3-SCS) and sol-gel synthesis (Mn2O3-SG550 and Mn2O3-SG650). The physicochemical properties of the catalysts were studied by means of N2-physisorption at −196 °C, X-ray powder diffraction, H2 temperature-programmed reduction (H2-TPR), soot-TPR, X-ray photoelectron spectroscopy (XPS) and field-emission scanning electron microscopy (FESEM). The high catalytic performance of the catalysts was verified in the oxidation of Volatile Organic Compounds (VOC) probe molecules (ethene and propene) and carbon soot in a temperature-programmed oxidation setup. The best catalytic performances in soot abatement were observed for the Mn2O3-SG550 and the Mn3O4/Mn2O3-SCS catalysts. The catalytic activity in VOC total oxidation was effectively correlated to the enhanced low-temperature reducibility of the catalysts and the abundant surface Oα-species. Likewise, low-temperature oxidation of soot in tight contact occurred over the Mn2O3-SG550 catalyst and was attributed to high amounts of surface Oα-species and better surface reducibility. For the soot oxidation in loose contact, the improved catalytic performance of the Mn3O4/Mn2O3-SCS catalyst was attributed to the beneficial effects of both the morphological structure that—like a filter—enhanced the capture of soot particles and to a probable high amount of surface acid-sites, which is characteristic of Mn3O4 catalysts.

Facilitating the C–C bond cleavage on sub-10 nm concavity-tunable Rh@Pt core–shell nanocubes for efficient ethanol electrooxidation

2019 ◽  
Vol 7 (30) ◽  
pp. 17987-17994 ◽  
Author(s):  
Pingting Li ◽  
Kai Liu ◽  
Jinyu Ye ◽  
Fei Xue ◽  
Yong Cheng ◽  
...  
Keyword(s):  
Bond Cleavage ◽  
Core Shell ◽  
Ethanol Electrooxidation ◽  
Atomic Steps

Concavity-tunable Rh@Pt core–shell nanocubes with an engineered Rh–Pt interface and Pt atomic steps facilitate C–C bond cleavage in the EOR.

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