scholarly journals Preformed Pd-Based Nanoparticles for the Liquid Phase Decomposition of Formic Acid: Effect of Stabiliser, Support and Au–Pd Ratio

2020 ◽  
Vol 10 (5) ◽  
pp. 1752 ◽  
Author(s):  
Felipe Sanchez ◽  
Ludovica Bocelli ◽  
Davide Motta ◽  
Alberto Villa ◽  
Stefania Albonetti ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Formic Acid ◽  
Pd Nanoparticles ◽  
Catalytic Performance ◽  
Atomic Ratio ◽  
Phase Decomposition ◽  
Acid Effect ◽  
Formic Acid Decomposition ◽  
Structure Morphology

Hydrogen is one of the most promising energy carriers for the production of electricity based on fuel cell hydrogen technology. Recently, hydrogen storage chemicals, such as formic acid, have been proposed to be part of the long-term solution towards hydrogen economy for the future of our planet. Herein we report the synthesis of preformed Pd nanoparticles using colloidal methodology varying a range of specific experimental parameters, such as the amount of the stabiliser and reducing agent, nature of support and Pd loading of the support. The aforementioned parameters have shown to affect mean Pd particle size, Pd oxidation, atomic content of Pd on the surface as well as on the catalytic performance towards formic acid decomposition. Reusability studies were carried out using the most active monometallic Pd material with a small loss of activity after five uses. The catalytic performance based on the Au–Pd atomic ratio was evaluated and the optimum catalytic performance was found to be with the Au/Pd atomic ratio of 1/3, indicating that the presence of a small amount of Pd is essential to promote significantly Au activity for the liquid phase decomposition of formic acid. Thorough characterisation has been carried out by means of XPS, SEM-EDX, TEM and BET. The observed catalytic performance is discussed in terms of the structure/morphology and composition of the supported Pd and Au–Pd nanoparticles.

scholarly journals Hydrogen production from formic acid decomposition in the liquid phase using Pd nanoparticles supported on CNFs with different surface properties

2018 ◽  
Vol 2 (12) ◽  
pp. 2705-2716 ◽  
Author(s):  
Felipe Sanchez ◽  
Mohammad Hayal Alotaibi ◽  
Davide Motta ◽  
Carine Edith Chan-Thaw ◽  
Andrianelison Rakotomahevitra ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Liquid Phase ◽  
Hydrogen Production ◽  
Formic Acid ◽  
Surface Properties ◽  
Pd Nanoparticles ◽  
Acid Decomposition ◽  
Storage Materials ◽  
Formic Acid Decomposition

The development of safe and efficient H2 generation/storage materials toward a fuel-cell-based H2 economy as a long-term solution has recently received much attention.

scholarly journals Catalytic Performance of Nitrogen-Doped Activated Carbon Supported Pd Catalyst for Hydrodechlorination of 2,4-Dichlorophenol or Chloropentafluoroethane

Molecules ◽  
2019 ◽  
Vol 24 (4) ◽  
pp. 674 ◽  
Author(s):  
Haodong Tang ◽  
Bin Xu ◽  
Meng Xiang ◽  
Xinxin Chen ◽  
Yao Wang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Liquid Phase ◽  
Gas Phase ◽  
Nitrogen Doping ◽  
Catalyst Surface ◽  
Catalytic Performance ◽  
Atomic Ratio ◽  
Pd Catalyst ◽  
Nitrogen Doped ◽  
The Stability

Nitrogen-doped activated carbon (N-AC) obtained through the thermal treatment of a mixture of HNO3-pretreated activated carbon (AC) and urea under N2 atmosphere at 600 °C was used as the carrier of Pd catalyst for both liquid-phase hydrodechlorination of 2,4-dichlorophenol (2,4-DCP) and gas-phase hydrodechlorination of chloropentafluoroethane (R-115). The effects of nitrogen doping on the dispersion and stability of Pd, atomic ratio of Pd/Pd2+ on the surface of the catalyzer, the catalyst’s hydrodechlorination activity, as well as the stability of N species in two different reaction systems were investigated. Our results suggest that, despite no improvement in the dispersion of Pd, nitrogen doping may significantly raise the atomic ratio of Pd/Pd2+ on the catalyst surface, with a value of 1.2 on Pd/AC but 2.2 on Pd/N-AC. Three types of N species, namely graphitic, pyridinic, and pyrrolic nitrogen, were observed on the surface of Pd/N-AC, and graphitic nitrogen was stable in both liquid-phase hydrodechlorination of 2,4-DCP and gas-phase hydrodechlorination of R-115, with pyridinic and pyrrolic nitrogen being unstable during gas-phase hydrodechlorination of R-115. As a result, the average size of Pd nanocrystals on Pd/N-AC was almost kept unchanged after liquid-phase hydrodechlorination of 2,4-DCP, whereas crystal growth of Pd was clearly observed on Pd/N-AC after gas-phase hydrodechlorination of R-115. The activity test revealed that Pd/N-AC exhibited a much better performance than Pd/AC in liquid-phase hydrodechlorination of 2,4-DCP, probably due to the enhanced stability of Pd exposed to the environment resulting from nitrogen doping as suggested by the higher atomic ratio of Pd/Pd2+ on the catalyst surface. In the gas-phase hydrodechlorination of R-115, however, a more rapid deactivation phenomenon occurred on Pd/N-AC than on Pd/AC despite a higher activity initially observed on Pd/N-AC, hinting that the stability of pyridinic and pyrrolic nitrogen plays an important role in the determination of catalytic performance of Pd/N-AC.

Yolk-Shell Fe3O4-Polyaniline Decorated Pd-Ni Nanoparticles with Enhanced Performance for Direct Formic Acid Fuel Cell

NANO ◽  
2017 ◽  
Vol 12 (02) ◽  
pp. 1750016 ◽  
Author(s):  
Akram Hosseinian ◽  
Rahim Hosseinzadeh-Khanmiri ◽  
Ebrahim Ghorbani-Kalhor ◽  
Jafar Abolhasani ◽  
Mirzaagha Babazadeh ◽  
...  
Keyword(s):  
Formic Acid ◽  
Formic Acid Oxidation ◽  
Catalytic Performance ◽  
Ni Catalyst ◽  
Acid Oxidation ◽  
Ni Nanoparticles ◽  
Functional Effect ◽  
Ni Catalysts ◽  
Promotional Effect

The yolk-shell Fe3O4-polyaniline for decoration of Pd-Ni nanoparticles (yolk-shell Fe3O4-PANI/Pd-Ni) were synthesized and used as a new electrocatalyst for oxidation of formic acid. The yolk-shell Fe3O4-PANI/Pd-Ni catalyst provided superior catalyst performance for formic acid oxidation in H2SO4 aqueous solution. These yolk-shell Fe3O4-PANI/Pd-Ni catalysts were found to be more resistant to deactivation in the oxidation of formic acid than yolk-shell Fe3O4-PANI/Pd and Pd/C and to consistently show better long-term performances. The enhanced catalytic performance may arise from the unique structure and surface properties of the yolk-shell Fe3O4-PANI and bi-functional effect, which process extraordinary promotional effect on Pd catalyst.

scholarly journals Effect of Pr, Mn Doping on the Structure and Properties of BiFeO3

2021 ◽  
Author(s):  
Lei Zhou ◽  
Guojian Jiang ◽  
Dandan Wu ◽  
Jianbing Chen
Keyword(s):  
Photocatalytic Performance ◽  
Physical Property Measurement System ◽  
Physical Property ◽  
Catalytic Performance ◽  
Atomic Ratio ◽  
X Ray Diffraction ◽  
Mn Doping ◽  
Structure Morphology ◽  
Property Measurement ◽  
Rhombohedral Perovskite Structure

Abstract The powders of Bi1-xPrxFeO3 (x = 0, 0.05, 0.1) and Bi0.95Pr0.05Fe1-yMnyO3 (y = 0.05, 0.1) were prepared by hydrothermal method. The effects of Pr and Mn doping content on the structure, morphology, magnetic, and photocatalytic properties of BiFeO3 (BFO) have been studied. X-ray diffraction (XRD) demonstrated that the compounds are distorted rhombohedral perovskite structure without any other heterogeneity and structural transition. Field emission scanning electron microscope (FESEM) reflected that the surface of compounds is a dense, agglomerated sphere, and the morphology changes with the addition of Pr, Mn. Energy spectrum analysis (EDS) shows that the Bi0.95Pr0.05Fe0.95Mn0.05O3 sample is mainly composed of 5 elements (Bi, Fe, O, Pr, Mn), and the atomic ratio matches the formula well. Integrating the vibrating sample magnetometer (VSM) into the physical property measurement system (PPMS-9) shows that the introduction of Pr3+and Mn2+ ions can enhance the magnetic properties of BFO at room temperature. In addition, doping with Pr3+ and Mn2+ ions can improve the photocatalytic performance of BFO, and with the increase of Mn2+ concentration, the photocatalytic performance of BFO first rises and then decreases, and its catalytic performance is getting better and better.

Facile synthesis of AgAuPd/graphene with high performance for hydrogen generation from formic acid

2015 ◽  
Vol 3 (28) ◽  
pp. 14535-14538 ◽  
Author(s):  
Si-jia Li ◽  
Yun Ping ◽  
Jun-Min Yan ◽  
Hong-Li Wang ◽  
Ming Wu ◽  
...  
Keyword(s):  
Formic Acid ◽  
High Performance ◽  
Hydrogen Generation ◽  
Catalytic Performance ◽  
Acid Decomposition ◽  
Facile Synthesis ◽  
Formic Acid Decomposition ◽  
Excellent Catalytic Performance

A well dispersed and ultrafine AgAuPd nanoalloy supported on rGO shows excellent catalytic performance toward hydrogen generation from formic acid decomposition.

Pd nanoparticles on a microporous covalent triazine polymer for H2 production via formic acid decomposition

2018 ◽  
Vol 215 ◽  
pp. 211-213 ◽  
Author(s):  
Siqian Zhang ◽  
Yu-Ri Lee ◽  
Hyo-jin Jeon ◽  
Wha-Seung Ahn ◽  
Young-Min Chung
Keyword(s):  
Formic Acid ◽  
Pd Nanoparticles ◽  
H2 Production ◽  
Acid Decomposition ◽  
Formic Acid Decomposition

scholarly journals Hydrogen Production from Formic Acid Attained by Bimetallic Heterogeneous PdAg Catalytic Systems

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4027 ◽  
Author(s):  
Miriam Navlani-García ◽  
David Salinas-Torres ◽  
Diego Cazorla-Amorós
Keyword(s):  
Formic Acid ◽  
High Performance ◽  
Heterogeneous Catalysts ◽  
Carbon Materials ◽  
Pd Nanoparticles ◽  
Catalytic Performance ◽  
Catalytic Systems ◽  
Storage Technologies ◽  
The Impact ◽  
Great Focus

The production of H2 from the so-called Liquid Organic Hydrogen Carriers (LOHC) has recently received great focus as an auspicious option to conventional hydrogen storage technologies. Among them, formic acid, the simplest carboxylic acid, has recently emerged as one of the most promising candidates. Catalysts based on Pd nanoparticles are the most fruitfully investigated, and, more specifically, excellent results have been achieved with bimetallic PdAg-based catalytic systems. The enhancement displayed by PdAg catalysts as compared to the monometallic counterpart is ascribed to several effects, such as the formation of electron-rich Pd species or the increased resistance against CO-poisoning. Aside from the features of the metal active phases, the properties of the selected support also play an important role in determining the final catalytic performance. Among them, the use of carbon materials has resulted in great interest by virtue of their outstanding properties and versatility. In the present review, some of the most representative investigations dealing with the design of high-performance PdAg bimetallic heterogeneous catalysts are summarised, paying attention to the impact of the features of the support in the final ability of the catalysts towards the production of H2 from formic acid.

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