Influence of Reductants on the Catalytic Properties of Nano-Gold Supported on Mesoporous SBA-15 for Glucose Oxidation

2012 ◽  
Vol 550-553 ◽  
pp. 220-224
Author(s):  
Chao Xian Wang ◽  
Yong Xiu Li ◽  
Hui Liu ◽  
Long Wei Ye ◽  
Chang Yong Sun ◽  
...  
Keyword(s):  
Particle Size ◽  
Catalytic Activity ◽  
Glucose Oxidation ◽  
Au Nanoparticles ◽  
Catalytic Properties ◽  
Aerobic Oxidation ◽  
Au Nps ◽  
Nano Gold ◽  
Sem And Tem ◽  
Oxidation Of Glucose

Impregnation and deposition-precipitation (DP) methods were employed for the preparation of Au nanoparticles supported on SBA-15, and the influences of various reductants were systematically surveyed. The dispersion and particle size of gold loaded on SBA-15 were determined by XRD, SEM and TEM. It has been found that reductants have effect on the size and dispersion of Au NPs, resulting in different catalytic properties for aerobic oxidation of glucose. The Au NPs on SBA-15 using KBH4as reductant was approximately 5-6 nm, which exhibited excellent catalytic activity.

A facile construction of Au nanoparticles on a copolymer ligand brushes modified graphene oxide nanoplatform with excellent catalytic properties

RSC Advances ◽  
2016 ◽  
Vol 6 (69) ◽  
pp. 64937-64945 ◽  
Author(s):  
Yajiao Song ◽  
Jianhua Lü ◽  
Bingxin Liu ◽  
Changli Lü
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Au Nanoparticles ◽  
Catalytic Properties ◽  
High Catalytic Activity ◽  
Au Nps ◽  
Modified Graphene Oxide ◽  
Modified Graphene ◽  
Copolymer Brush

Au NPs were generated via in situ reduction on copolymer brush P(OEGMA-co-MQ) functionalized GO. MQ units in the brushes as capping agents could stabilize the Au NPs. The Au NPs–GO hybrid exhibited high catalytic activity for the reduction of 4-NP.

scholarly journals Catalytic activity of gold nanoparticles deposited on N-doped carbon-based supports in oxidation of glucose and arabinose mixtures

2021 ◽  
Author(s):  
Sebastian Franz ◽  
Nataliya D. Shcherban ◽  
Igor Bezverkhyy ◽  
Sergii A. Sergiienko ◽  
Irina L. Simakova ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Glucose Oxidation ◽  
Glucuronic Acid ◽  
Carbon Surface ◽  
Carbon Supports ◽  
Constant Ph ◽  
Oxidation Of Glucose ◽  
Mesoporous Structures ◽  
Carbon Based

AbstractOxidation of a mixture of glucose and arabinose over Au particles deposited on porous carbons, N-doped carbons and carbon nitrides was investigated at 70 °C, under constant pH of 8, and oxygen partial pressure 0.125 atm. In particular, Au deposited on nitrogen-containing carbon-based mesoporous structures demonstrated activity in the oxidation of the sugars to the corresponding aldonic acids higher than gold deposited on undoped carbon supports (conversion of glucose up to ca. 60%, arabinose–ca. 30% after 200 min). The results can be explained by the basic nature of the supports leading to an increase in the polarity of the carbon surface and the oxygen activation. Glucuronic acid (with selectivity ca. 10–93.5%) together with gluconic acid was formed as a result of glucose oxidation, while arabinose was selectively oxidized to arabinonic acid.

scholarly journals Size-Controlled Preparation of Gold Nanoparticles Deposited on Surface-Fibrillated Cellulose obtained by Citric Acid-Modification

2020 ◽  
Author(s):  
Chutimasakul Threeraphat ◽  
Yuta Uetake ◽  
Jonggol Tantirungrotechai ◽  
Taka-Aki Asoh ◽  
Hiroshi Uyama ◽  
...  
Keyword(s):  
Particle Size ◽  
Citric Acid ◽  
Aerobic Oxidation ◽  
Functional Materials ◽  
Deposition Efficiency ◽  
Acid Modification ◽  
Au Nps ◽  
Size Growth ◽  
Controlled Preparation ◽  
Hydroxy Groups

<p>Cellulose-based functional materials have gained immense interest due to its low density, hydrophilicity, chirality, and degradability. So far, a facile and scalable preparation of fibrillated cellulose by treating the hydroxy groups of cellulose with citric acid (F-CAC) have been developed, and applied as a reinforcing filler for polypropylene composite. Herein, a size-selective preparation of Au nanoparticles (NPs) stabilized by F-CAC is described. By modifying the conditions of trans-deposition method, established in our group previously, a transfer of Au NPs from poly(<i>N</i>-vinyl-2-pyrrolidone) (PVP) to F-CAC proceeded up to 96% transfer efficiency with retaining its cluster sizes in EtOH. Meanwhile, the deposition efficiency drastically decreased in the case of non-modified cellulose, showing the significance of citric acid-modification. A shift of binding energy at Au 4f core level X-ray photoelectron microscopy (XPS) from 82.0 eV to 83.3 eV indicated that the NPs were stabilized on a F-CAC surface rather than by PVP matrix. The reproducible particle size growth was observed when 2-propanol was used as a solvent instead of EtOH, expanding the range of the available particle size with simple manipulation. The thus-obtained Au:F-CAC nanocatalysts exhibited a catalytic activity toward an aerobic oxidation of 1-indonol in toluene to yield 1-indanone quantitatively, and were recyclable at least 6 times, illustrating high tolerance against organic solvents.</p>

Effect of CeO2 morphology on the catalytic properties of Au/CeO2 for base-free glucose oxidation

2022 ◽  
Author(s):  
Xing-Yue Qi ◽  
Yalin He ◽  
Yan Yao ◽  
Lu Zhang ◽  
Yiran Li ◽  
...  
Keyword(s):  
Selective Oxidation ◽  
Gluconic Acid ◽  
Glucose Oxidation ◽  
Catalytic Properties ◽  
Value Added ◽  
Biomass Utilization ◽  
Free Glucose ◽  
Oxidation Of Glucose ◽  
Catalytic Selective Oxidation

Catalytic selective oxidation of glucose into value-added gluconic acid is one of the sustainable routes for biomass utilization, for which the supported Au catalysts have been widely explored. Au/CeO2 was...

A hybrid composite of hydroxyapatite and Ca–Al layered double hydroxide supported Au nanoparticles for highly efficient base-free aerobic oxidation of glucose

2019 ◽  
Vol 48 (25) ◽  
pp. 9161-9172 ◽  
Author(s):  
Yunfeng Zhuge ◽  
Guoli Fan ◽  
Yanjun Lin ◽  
Lan Yang ◽  
Feng Li
Keyword(s):  
Layered Double Hydroxide ◽  
Hybrid Composite ◽  
Au Nanoparticles ◽  
Aerobic Oxidation ◽  
Catalytic Performance ◽  
Highly Efficient ◽  
Double Hydroxide ◽  
Oxidation Of Glucose

A novel hybrid composite of hydroxyapatite/Ca–Al layered double hydroxide supported Au nanoparticles exhibited robust catalytic performance in base-free aerobic oxidation of glucose.

scholarly journals Aerobic Oxidation of 5-Hydroxymethylfurfural over Ag Nanoparticle Catalysts Stabilized by Polyvinylpyrrolidone with Different Molecular Weights

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1624
Author(s):  
Haian Xia ◽  
Jiahuan An ◽  
Weizi Zhang
Keyword(s):  
Catalytic Activity ◽  
Photoelectron Spectroscopy ◽  
Catalytic Properties ◽  
Aerobic Oxidation ◽  
Ag Nps ◽  
Oxidation Activity ◽  
X Ray ◽  
Remarkable Effect ◽  
Molecular Weights ◽  
Metal Support Interaction

The metal–support interaction (MSI) has a remarkable effect on the catalytic properties, but how to precisely modulate its degree remains a huge challenge. Herein, polyvinylpyrrolidone (PVP) with three different molecular weights (MWs) (24, 58, and 130 kDa) was used as a capping agent to fabricate Ag nanoparticles (NPs) supported on ZrO2. The physiochemical properties of the catalysts were characterized by X-ray diffraction (XRD), Transmission Electron Microscope (TEM), X-ray Photoelectron Spectroscopy (XPS), and Fourier transform infrared (FT-IR) techniques. The impacts of MSI on the catalytic activity and reaction kinetics for aerobic oxidation of 5-hydroxymethylfurfural (HMF) were investigated. The results showed that the introduction of PVP with various MWs could efficiently tailor the interfacial interactions and charge transfers (CT) among PVP, the support, and Ag NPs, thereby affecting the oxidation activity of HMF. The turnover number (TON) for HMF oxidation decreases in the order of unsupported colloidal Ag clusters > Ag/ZrO2 (58,000) > Ag/ZrO2 (130,000) > Ag/ZrO2 (24,000) > Ag/ZrO2. The reason for this large difference in the catalytic activity for HMF oxidation is that various MWs of PVP result in a change of MSI, thereby facilitating CT from PVP to Ag metal sites. This study offers a new strategy for modulating MSI by varying the MW of capping agents, thereby tuning the catalytic properties in the oxidation of HMF.

Fabrication of Highly Ordered Carbon Networks as Catalyst Supports for Aerobic Oxidation of Glucose

2012 ◽  
Vol 476-478 ◽  
pp. 1186-1192 ◽  
Author(s):  
Chao Xian Wang ◽  
Chang Yong Sun ◽  
Chang Jiang Yu ◽  
Yong Xiu Li ◽  
Jian Zhao ◽  
...  
Keyword(s):  
Mesoporous Carbon ◽  
Carbon Materials ◽  
Aerobic Oxidation ◽  
Specific Area ◽  
High Catalytic Activity ◽  
Au Nps ◽  
Carbon Networks ◽  
High Specific Area ◽  
Oxidation Of Glucose ◽  
Uniform Pore Size

Highly ordered macro- and meso- porous carbon materials were prepared in a facile nanocasting approach using colloidal crystals silica and SBA-15 as starting template, respectively. The synthesized macroporous carbon templated from colloidal silica shows a honeycomb-like morphology and three-dimensionally interconnected networks of macrospores of about 400 nm in diameter. The resulting mesoporous carbon derived from SBA-15 templates exhibits high specific area (1206m2/g), large pore volume (1.097cc/g) and uniform pore size distribution (3.64 nm). These carbon materials were employed to aerobic oxidation of glucose as support of Au NPs catalyst. 2wt% Au NPs/mesoporous carbon shows high catalytic activity due to highly dispersion of Au NPs resulting from the confinement effects of mesoporous carbon.

scholarly journals Catalytic Activity of Atomic Gold-Decorated Polyaniline Support in Glucose Oxidation

Electrochem ◽  
2020 ◽  
Vol 1 (4) ◽  
pp. 394-399
Author(s):  
Yuki Ito ◽  
Tso-Fu Mark Chang ◽  
Yu-An Chien ◽  
Chun-Yi Chen ◽  
Parthojit Chakraborty ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Glucose Oxidation ◽  
Gold Clusters ◽  
Atomic Level ◽  
Atomic Size ◽  
Electrodeposition Process ◽  
Oxidation Current ◽  
Au Cluster ◽  
Phosphate Buffered Saline ◽  
Oxidation Of Glucose

Atomic-level gold clusters are decorated on a polyaniline (PANI) support by a cyclic atomic electrodeposition process, and the catalytic activity in the oxidation of glucose is studied. The evaluation is conducted by cyclic voltammetry using atomic-level gold clusters-decorated PANI (PANI/AuN, where N indicates the atomic size of the Au cluster and N = 1~3 in this study) as the working electrode and a solution containing 0 to 50.0 mM of glucose in phosphate-buffered saline. The catalytic activity is determined from the oxidation current observed at around +0.6 V vs. Ag/AgCl. The catalytic activity is found to be affected by the size of gold clusters decorated on the PANI/AuN, whereby the catalytic activity is low when N is 1 or 3. On the other hand, an obvious enhancement in the catalytic activity is observed for the PANI/Au2 electrode.

Direct observation of enhanced plasmon-driven catalytic reaction activity of Au nanoparticles supported on reduced graphene oxides by SERS

2015 ◽  
Vol 17 (15) ◽  
pp. 10176-10181 ◽  
Author(s):  
Xiu Liang ◽  
Tingting You ◽  
Dapeng Liu ◽  
Xiufeng Lang ◽  
Enzhong Tan ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Direct Observation ◽  
Catalytic Reaction ◽  
Au Nanoparticles ◽  
Graphene Oxides ◽  
Au Nps ◽  
Reduced Graphene ◽  
Reduced Graphene Oxides

Compared with Au NPs, Au/rGO exhibited an enhanced catalytic activity in the reduction from 4-nitrobenzenethiol (4-NBT) to p,p′-dimercaptoazobenzene (DMAB) during systematic SERS experiments.

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