Effects of fluorinated hydrocarbon addition on H2O2 direct synthesis from H2 and air over an Au–Pd bimetallic catalyst supported on rutile-TiO2

2013 ◽  
Vol 3 (11) ◽  
pp. 2971 ◽  
Author(s):  
Tatsumi Ishihara ◽  
Kohei Shigeta ◽  
Yuuki Ooishi ◽  
Maki Matsuka ◽  
Hidehisa Hagiwara ◽  
...  
Keyword(s):  
Bimetallic Catalyst ◽  
Direct Synthesis ◽  
Rutile Tio2 ◽  
H2o2 Direct Synthesis

Preparation of Ni–Cu Bimetallic Catalyst and its Properties for the Direct Synthesis of Acetic Acid from Methanol and Carbon Monoxide

2012 ◽  
Vol 608-609 ◽  
pp. 1383-1386
Author(s):  
Jun Feng Wen ◽  
Xia Liu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Carbon Monoxide ◽  
Acetic Acid ◽  
Bimetallic Catalysts ◽  
Bimetallic Catalyst ◽  
Direct Synthesis ◽  
Catalytic Activities ◽  
Supported Ni ◽  
Scanning Electron

Active carbon (AC) supported Ni–Cu bimetallic catalysts for the direct synthesis of acetic acid (AcOH) from CH3OH and CO were synthesized and investigated. The synthesized catalysts were fully characterized using surface comparator and scanning electron microscopy (SEM) techniques. The catalytic activities were investigated by the initial experiments. The experimental results showed that Ni–Cu /AC catalysts were efficient for the direct synthesis of AcOH. The conversion of CH3OH was higher than 15.7 % .

scholarly journals Catalytic CO Oxidation and H2O2 Direct Synthesis over Pd and Pt-Impregnated Titania Nanotubes

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 949
Author(s):  
Lucas Warmuth ◽  
Gülperi Nails ◽  
Maria Casapu ◽  
Sheng Wang ◽  
Silke Behrens ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Co Oxidation ◽  
Gas Phase ◽  
Surface Area ◽  
Heterogeneous Catalysts ◽  
Direct Synthesis ◽  
Pt Nanoparticles ◽  
Titania Nanotubes ◽  
Catalytic Co Oxidation ◽  
H2o2 Direct Synthesis

Titania nanotubes (TNTs) impregnated with Pd and Pt nanoparticles are evaluated as heterogeneous catalysts in different conditions in two reactions: catalytic CO oxidation (gas phase, up to 500 °C) and H2O2 direct synthesis (liquid phase, 30 °C). The TNTs are obtained via oxidation of titanium metal and the intermediate layer-type sodium titanate Na2Ti3O7. Thereafter, the titanate layers are exfoliated and show self-rolling to TNTs, which, finally, are impregnated with Pd or Pt nanoparticles at room temperature by using Pd(ac)2 and Pt(ac)2. The resulting crystalline Pd/TNTs and Pt/TNTs are realized with different lengths (long TNTs: 2.0–2.5 µm, short TNTs: 0.23–0.27 µm) and a specific surface area up to 390 m2/g. The deposited Pd and Pt particles are 2–5 nm in diameter. The TNT-derived catalysts show good thermal (up to 500 °C) and chemical stability (in liquid-phase and gas-phase reactions). The catalytic evaluation results in a low CO oxidation light-out temperature of 150 °C for Pt/TNTs (1 wt-%) and promising H2O2 generation with a productivity of 3240 molH2O2 kgPd−1 h−1 (Pd/TNTs, 5 wt-%, 30 °C). Despite their smaller surface area, long TNTs outperform short TNTs with regard to both CO oxidation and H2O2 formation.

Reactivity Aspects of SBA15-Based Doped Supported Catalysts: H2O2 Direct Synthesis and Disproportionation Reactions

2013 ◽  
Vol 56 (9-10) ◽  
pp. 540-549 ◽  
Author(s):  
Nicola Gemo ◽  
Pierdomenico Biasi ◽  
Paolo Canu ◽  
Federica Menegazzo ◽  
Francesco Pinna ◽  
...  
Keyword(s):  
Supported Catalysts ◽  
Direct Synthesis ◽  
H2o2 Direct Synthesis

scholarly journals Silver–palladium catalysts for the direct synthesis of hydrogen peroxide

2017 ◽  
Vol 376 (2110) ◽  
pp. 20170058 ◽  
Author(s):  
Zainab Khan ◽  
Nicholas F. Dummer ◽  
Jennifer K. Edwards
Keyword(s):  
Hydrogen Peroxide ◽  
Photoelectron Spectroscopy ◽  
Palladium Catalysts ◽  
Bimetallic Catalyst ◽  
Direct Synthesis ◽  
Side Reactions ◽  
X Ray ◽  
Temperature Programmed ◽  
Silver Palladium ◽  
Subsequent Decomposition

A series of bimetallic silver–palladium catalysts supported on titania were prepared by wet impregnation and assessed for the direct synthesis of hydrogen peroxide, and its subsequent side reactions. The addition of silver to a palladium catalyst was found to significantly decrease hydrogen peroxide productivity and hydrogenation, but crucially increase the rate of decomposition. The decomposition product, which is predominantly hydroxyl radicals, can be used to decrease bacterial colonies. The interaction between silver and palladium was characterized using scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy (XPS) and temperature programmed reduction (TPR). The results of the TPR and XPS indicated the formation of a silver–palladium alloy. The optimal 1% Ag–4% Pd/TiO 2 bimetallic catalyst was able to produce approximately 200 ppm of H 2 O 2 in 30 min. The findings demonstrate that AgPd/TiO 2 catalysts are active for the synthesis of hydrogen peroxide and its subsequent decomposition to reactive oxygen species. The catalysts are promising for use in wastewater treatment as they combine the disinfectant properties of silver, hydrogen peroxide production and subsequent decomposition. This article is part of a discussion meeting issue ‘Providing sustainable catalytic solutions for a rapidly changing world’.

scholarly journals A Study of Palladium-Nickel Catalyst for Direct Synthesis of Hydrogen Peroxide: A DFT Approach

2020 ◽  
Vol 5 (2) ◽  
pp. 46-55
Author(s):  
Mawan Nugraha ◽  
◽  
Susiani Pupon ◽  
Nofiandri Setyasmara ◽  
◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Density Functional ◽  
Catalyst Surface ◽  
Direct Synthesis ◽  
Direct Reaction ◽  
Theory Approach ◽  
Functional Theory ◽  
Current Production ◽  
The Stability ◽  
H2o2 Direct Synthesis

Hydrogen peroxide is an important material for bleaching agent in paper production related to the low price and environmentally friendly chemical. The current production of H2O2 is well-known as indirect synthesis, which uses danger anthraquinone. The synthesis was improved by using the direct reaction of H2 and O2 on Pd or PdAu alloy's catalyst surface and has been known as direct synthesis. The current catalyst used is Pd-Au, but it has limited availability in nature. Therefore we need the alternative of Pd-Au. We investigated Ni alloyed with Pd for the new H2O2 direct synthesis catalyst using a density functional theory approach. We selected the O adsorption to screen the catalysts and compared the species adsorption trend on the surfaces of PdNi and the proven catalysts such as Pd, PdAu, and PdHg. Since the trend of O adsorption on the PdAu and PdNi is similar, it can be concluded that the catalytic selectivity of PdNi equal with PdAu. Further, the stability of PdNi alloy was explored by calculating the binding and compared it with Pd, which leads to the conclusion that PdNi can be a good catalyst for H2O2 synthesis.

scholarly journals Continuous H2O2 direct synthesis over PdAu catalysts

2011 ◽  
Vol 176-177 ◽  
pp. 172-177 ◽  
Author(s):  
Pierdomenico Biasi ◽  
Federica Menegazzo ◽  
Francesco Pinna ◽  
Kari Eränen ◽  
Tapio O. Salmi ◽  
...  
Keyword(s):  
Direct Synthesis ◽  
H2o2 Direct Synthesis

Kinetics and Mechanism of H2O2 Direct Synthesis over a Pd/C Catalyst in a Batch Reactor

2012 ◽  
Vol 51 (26) ◽  
pp. 8903-8912 ◽  
Author(s):  
Pierdomenico Biasi ◽  
Nicola Gemo ◽  
José Rafael Hernández Carucci ◽  
Kari Eränen ◽  
Paolo Canu ◽  
...  
Keyword(s):  
Batch Reactor ◽  
Direct Synthesis ◽  
Kinetics And Mechanism ◽  
H2o2 Direct Synthesis

Direct Synthesis of Photocatalytically Active Rutile TiO2 Nanorods Partly Decorated with Anatase Nanoparticles

2010 ◽  
Vol 114 (11) ◽  
pp. 4909-4915 ◽  
Author(s):  
Tarek A. Kandiel ◽  
Ralf Dillert ◽  
Armin Feldhoff ◽  
Detlef W. Bahnemann
Keyword(s):  
Direct Synthesis ◽  
Tio2 Nanorods ◽  
Rutile Tio2 ◽  
Anatase Nanoparticles
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