New idea with Plant Tannin
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A Research team of Lithium Battery, Fuel Cell & Solar Cell Student : Hakun Wirawasista Apara marta Advisor : Bing Joe Hwang March 2, 2012 New Idea Bimetallic Nanocatalysts with Plant Tannin Based Green Process for Production of Hydrogen Peroxide
Transcript of New idea with Plant Tannin
A Research team of Lithium Battery, Fuel Cell & Solar Cell
Student : Hakun Wirawasista Apara martaAdvisor : Bing Joe Hwang
March 2, 2012
New Idea
Bimetallic Nanocatalysts with Plant Tannin Based Green Process
for Production of Hydrogen Peroxide
Motivation of this paper1. What are the existing issues?2. Why are the authors interested in
this topics?
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Graphene has remarkable properties and enormous potential applications.
Therefore, it is essential to have a simple, reproducible, and controlable technique to produce large area graphene sheets, on large scale.
Micromechanical cleaving, exfoliation via sonication in solvent, growth of graphene on SiC or Ni substrates have been reported.
However reduction of graphene from XGO is promising for large scale production.
Many reports: employ hydrazine, or rapid heating to high temp (~1000 ⁰C).
Thus, it is desirable to seek other reduction methods.They reported new hydrazine free and aqueous only route towards graphene at
moderate temperature.
INTRODUCTIONGeneral problems of syntesis H2O2: Auto-oxidation (AO) of
alkylated anthraquinone: 95% of the world production is not green process (formation of hydroxyanthrones, anthrones, anthracenes, and epoxide) bad impact to the environment
H2/O2 mixture is explosive (4–94 %vol)
Direct catalytic combination of H2 with O2 prefers to give H2O rather than H2O2 and catalyst is also active for the H2O2 decomposition (selectivity & productivity)
Large scale productions, low efficiency, high energy consumption & risks of transport & explosion
The synthesize of catalyst always use high temperature very expensive reductant & need add stabilizer.
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How to overcome these drawbacks?propose a green strategy for the synthesis of core–shell Au@Pd bimetallic NPs by using plant tannins (plant polyphenols) as a reductant and stabilizer can use at room temperature & can synthesize coreshell only at 1 step.
INTRODUCTION
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DESCRIPTION OF PLANT TANNINS extracted from plants, are soluble polyphenols with multifunctional groups, which are generally classified into condensed tannins and hydrolysable tannins.
The molecular structure of condensed tannins mainly consists of polymerized flavan-3-ols.
The unique electronic properties of condensed tannins are able to gradually donate the electrons of ortho-phenolic hydroxyls, thus exhibiting mild and stepwise reduction ability.
the molecular backbone of condensed tannins consists of aromatic rings, which can provide steric hindrance to prevent the aggregation of metal particles effective as stabilizer
DESIGN of EXPERIMENTSol HAuCl4 Sol Na2PdCl4
Adding 40.0 mL of BT solution
(0.02 g)
shaken at 30 C◦under ambient atmosphere for
24 h
Mix the both solution with different molar ratio (exp: 0.025 mmol Au3+/0.0005 mmol Pd2+)
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1. Bayberry Tannin (BT) as reducing agent & Stabilizer
2. The particle size is determined by the rate of reduction of the metal precursor
Put in microwave at 100 W & 30 oC for
1 hr
Green Chem., 2011
A Research team of Lithium Battery, Fuel Cell & Solar Cell
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