The Effect of La2O3 on Pd Close-Coupled Catalysts

Yao, Yanling; Fang, Ruimei; Shi, Zhuqun; Gong, Maochu; Chen, Yaoqiang

doi:10.1016/s1872-2067(10)60204-5

Cited by 13 publications

(7 citation statements)

References 20 publications

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“…The XRD patterns of all Pd x La y /rGO catalysts show the diffraction peaks at 2θ = 40° and 47° which correspond to the (111) and (200) crystalline planes of a single face centered cubic (fcc) structure of Pd metal. The interaction of Pd with La/La 2 O 3 can be noticed by slight shifting of pure Pd peaks . The PXRD analysis revealed no obvious peak for La/La 2 O 3, which is due to slight alloying of La with Pd and amorphous nature of La 2 O 3 .…”

Section: Resultsmentioning

confidence: 93%

La₂O₃Promoted Pd/rGO Electro-catalysts for Formic Acid Oxidation

Ali

Kanodarwala

Majeed

et al. 2016

ACS Appl. Mater. Interfaces

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High activity, a low rate of CO poisoning, and long-term stability of Pd electro-catalysts are necessary for practical use as an anode material in direct formic acid fuel cells. Achieving a high degree of Pd nanoparticle dispersion on a carbon support, without agglomeration, while maintaining a facile electron transfer through the catalyst surface are two challenging tasks to be overcome in fulfilling this aim. Herein, we report the effect of addition of La/La-oxides on the efficiency of Pd nanoparticles supported on reduced graphene oxide (rGO) for formic acid electro-oxidation reaction. A series of electro-catalysts with different Pd-La molar ratios were successfully synthesized and characterized using a range of techniques including PXRD, XPS, TEM, FTIR, and Raman spectroscopy and then tested as anode materials for direct formic acid fuel cells. We explore that the lanthanum species (La/La-oxide) significantly promote the activity and stability of Pd catalyst toward electrocatalytic oxidation of formic acid. The metallic ratio is found to be critical, and the activity order of various catalysts is observed as follows; PdLa/rGO > PdLa/rGO > PdLa rGO. The obtained mass specific activity for PdLa/rGO (986.42 A/g) is 2.18 times higher than that for Pd/rGO (451 A/g) and 16 times higher than that for Pd/C (61.5 A/g) at given onset peak potentials. The high activity and stability of the electro-catalysts are attributed to the uniform dispersion of Pd nanoparticles over the rGO support, as evidenced from TEM images. It is believed that the role of La species in promoting the catalyst activity is to disperse the catalyst particles during synthesis and to facilitate the electron transfer via providing a suitable pathway during electrochemical testing.

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Section: Resultsmentioning

confidence: 93%

La₂O₃Promoted Pd/rGO Electro-catalysts for Formic Acid Oxidation

Ali

Kanodarwala

Majeed

et al. 2016

ACS Appl. Mater. Interfaces

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“…It is seen that a weak peak at 121°C was present in the Pd/γ-Al2O3 catalyst, it is attributed to the reduction of PdO species. 18,19 For the MnOx/γ-Al2O3 catalyst, the broad peaks around 150-370°C and 420-610°C are observed. The broad peak around 150-370°C can be divided into two peaks at 181 and 258°C, which are ascribed as MnO2 and Mn2O3 reduction to Mn3O4.…”

Section: Activity Of Catalysts and Synergetic Effect Between Pd And Mnoxmentioning

confidence: 98%

“…19 The broad peak around 420-610°C can be divided into two peaks at 475 and 538°C, which represent Mn3O4 reducing to MnO. 19 For the Pd-MnOx/γ-Al2O3 catalyst, a peak at 155°C is attributed to the reduction of PdO species, 18 and a peak around 210°C is due to MnO2 and Mn2O3 reduction to Mn3O4, 19 and a peak at 430°C is ascribed to Mn3O4 reduction to MnO. 19 The reduction temperature of MnOx is lowered in the presence of Pd, implying that there is an obvious interaction between Pd and MnOx.…”

Section: Activity Of Catalysts and Synergetic Effect Between Pd And Mnoxmentioning

confidence: 99%

“…Namely, MnOx species is highly active and is easily reduced for the Pd-MnOx/SiO2 catalyst. For the Pd-MnOx/La-Al2O3 catalyst, a large reduction peak around 58-200°C can be divided into two peaks at 116 and 145°C, which are ascribed to the reduction of PdO and MnOx, respectively 18. The reduction temperatures of PdO and MnOx are low for Pd-MnOx/SiO2 and Pd-MnOx/La-Al2O3, implying high reducibility and better activity of PdO and MnOx.…”

mentioning

confidence: 97%

“…The reduction temperatures of PdO and MnOx are low for Pd-MnOx/SiO2 and Pd-MnOx/La-Al2O3, implying high reducibility and better activity of PdO and MnOx. The peak at 155°C is due to the reduction of PdO,18 the peak at…”

mentioning

confidence: 99%

See 2 more Smart Citations

Pd-MnOx/γ-Al2O3 Monolithic Catalysts Prepared by Impregnation Method and Effect of Different Supports on Ground-Level Ozone Decomposition

Ren¹,

Zhou²,

Shang³

et al. 2014

Acta Physico-Chimica Sinica

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Pd-MnOx/γ-Al2O3 catalysts were prepared by impregnating Pd and MnOx on γ-Al2O3 supports, using an incipient wetness impregnation method, and then coating on a cordierite substrate to obtain monolithic catalysts. The catalysts were characterized using X-ray diffraction (XRD), temperatureprogrammed reduction of H2 (H2-TPR), low-temperature N2 adsorption-desorption measurements, and Xray photoelectron spectroscopy (XPS). The effects of the Pd and MnOx impregnation order on the catalytic activity, redox performance, textural properties, and surface electronic characteristics of the catalysts were studied. The experimental results showed that the activity of the catalyst co-impregnated with Pd and MnOx on γ-Al2O3 was better than that of the catalyst impregnated sequentially with Pd and MnOx. A synergetic effect was observed between Pd and MnOx on the Pd-MnOx/γ-Al2O3 catalysts for ozone decomposition. The effects of various supports on catalytic activity, redox performance, textural properties, and surface electron characteristics of the catalysts were also investigated. The results indicated that the catalytic activities of Pd-MnOx/La-Al2O3 and Pd-MnOx/SiO2 catalysts were the best; ozone conversion reached 82% at 14°C and ozone was completely decomposed at 36°C. The activity of the Pd-MnOx/γ-Al2O3 catalyst was second better, but the activity of the Pd-MnOx/Zr-Al2O3 catalyst was poor. The support clearly affects the reducibility of PdO and MnOx. The redox performances of MnOx impregnated on different supports followed the order:

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Effect of support on palladium catalyst for aqueous-phase hydrogenation of maleic acid to succinic acid

Sun

Wang

et al. 2023

Res Chem Intermed

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The synthesis of succinic acid (SA), one of the monomers for producing Poly (butylene succinate), which is a type of biodegradable plastic, has become a crucial and even bottleneck technology for the industry's development. Herein, the Pd-based catalysts were prepared with amorphous TiO 2 , CeO 2 and ZrO 2 as the supports and applied in maleic acid (MA) hydrogenation to SA in aqueous phase at a low temperature about 60 o C. It was found that the activity of Pd/CeO 2 catalysts is signi cantly higher than that of Pd/TiO 2 and Pd/ZrO 2 catalysts. The strong interaction between Pd and CeO 2 inhibited the agglomeration of Pd during the reduction and reaction process, leading to the highest Pd dispersion among the three catalysts. The exposure of more active sites for the adsorption of H 2 endows it high activity in the process of MA hydrogenation to SA.

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The Effect of La2O3 on Pd Close-Coupled Catalysts

Cited by 13 publications

References 20 publications

La₂O₃Promoted Pd/rGO Electro-catalysts for Formic Acid Oxidation

La₂O₃Promoted Pd/rGO Electro-catalysts for Formic Acid Oxidation

Pd-MnO<sub><em>x</em></sub>/<em>γ</em>-Al<sub>2</sub>O<sub>3</sub> Monolithic Catalysts Prepared by Impregnation Method and Effect of Different Supports on Ground-Level Ozone Decomposition

Effect of support on palladium catalyst for aqueous-phase hydrogenation of maleic acid to succinic acid

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The Effect of La2O3 on Pd Close-Coupled Catalysts

Cited by 13 publications

References 20 publications

La2O3Promoted Pd/rGO Electro-catalysts for Formic Acid Oxidation

La2O3Promoted Pd/rGO Electro-catalysts for Formic Acid Oxidation

Pd-MnO<sub><em>x</em></sub>/<em>&gamma;</em>-Al<sub>2</sub>O<sub>3</sub> Monolithic Catalysts Prepared by Impregnation Method and Effect of Different Supports on Ground-Level Ozone Decomposition

Effect of support on palladium catalyst for aqueous-phase hydrogenation of maleic acid to succinic acid

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Product

Resources

About

La₂O₃Promoted Pd/rGO Electro-catalysts for Formic Acid Oxidation

La₂O₃Promoted Pd/rGO Electro-catalysts for Formic Acid Oxidation

Pd-MnO<sub><em>x</em></sub>/<em>γ</em>-Al<sub>2</sub>O<sub>3</sub> Monolithic Catalysts Prepared by Impregnation Method and Effect of Different Supports on Ground-Level Ozone Decomposition