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

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

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

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

Synthesis of Dimethyl Carbonate from Methanol and Carbon Dioxide by Heteropolyacid/Metal Oxide Catalysts

2007 ◽  
Vol 119 ◽  
pp. 287-290 ◽  
Author(s):  
Kyung Won La ◽  
Min Hye Youn ◽  
Jin Suk Chung ◽  
Sung Hyeon Baeck ◽  
In Kyu Song
Keyword(s):  
Carbon Dioxide ◽  
Metal Oxide ◽  
Dimethyl Carbonate ◽  
Batch Reactor ◽  
Direct Synthesis ◽  
Sol Gel ◽  
Catalytic Performance ◽  
Acid Sites ◽  
Pure Ceo2 ◽  
Autoclave Reactor

CexTi1-xO2 and H3PW12O40/CexTi1-xO2 catalysts were prepared by sol-gel method, and they were applied to the direct synthesis of dimethyl carbonate (DMC) from methanol and carbon dioxide in a batch reactor. The reaction was carried out in an autoclave reactor at 170oC and 5 MPa. It was found that CexTi1-xO2 exhibited a higher catalytic performance than pure CeO2 and TiO2. The catalytic performance of CexTi1-xO2 was the maximum when x=0.1. It was also revealed that H3PW12O40/CexTi1-xO2 catalysts showed a remarkably enhanced catalytic performance than the corresponding CexTi1-xO2 catalysts. The amount of DMC produced by 15 wt% H3PW12O40/ Ce0.1Ti0.9O2 catalyst was six times higher than that produced by Ce0.1Ti0.9O2 catalyst. It is concluded that both Brönsted acid sites provided by H3PW12O40 and base sites in CexTi1-xO2 played an important role in improving the catalytic performance of H3PW12O40/CexTi1-xO2.

Product distribution analysis of the hydrogen peroxide direct synthesis in an isothermal batch reactor

2015 ◽  
Vol 248 ◽  
pp. 108-114 ◽  
Author(s):  
Tapio Salmi ◽  
Nicola Gemo ◽  
Pierdomenico Biasi ◽  
Juan Garcia Serna
Keyword(s):  
Hydrogen Peroxide ◽  
Batch Reactor ◽  
Direct Synthesis ◽  
Product Distribution ◽  
Distribution Analysis

In vitro Inhibition of Cholinesterases by Carbamates - A Kinetic Study

2007 ◽  
Vol 62 (3-4) ◽  
pp. 305-307 ◽  
Author(s):  
Alena Komersová ◽  
Markéta Masopustová ◽  
Karel Komers ◽  
Šárka Štěpánková ◽  
Alexandr Čegan
Keyword(s):  
Ionic Strength ◽  
Kinetic Study ◽  
Rate Constants ◽  
Competitive Inhibition ◽  
Batch Reactor ◽  
Kinetics And Mechanism ◽  
In Vitro Inhibition

Abstract Kinetics and mechanism of in vitro hydrolyses of acetylcholine and acetylthiocholine by carbamates were studied in a batch reactor at 25 °C, pH 8, and ionic strength of 0.11 m. Every hydrolysis was monitored by 3-4 independent methods. All studied hydrolyses can be described by the model of competitive inhibition with an irreversible step (k3). A table of obtained average values of rate constants and discussion of the resultes are given.

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