scholarly journals Enhanced Catalytic Activity of Supported Gold Catalysts for Oxidation of Noxious Environmental Pollutant CO

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Pranjal Saikia ◽  
Abu Taleb Miah ◽  
Banajit Malakar ◽  
Ankur Bordoloi
Keyword(s):  
Catalytic Activity ◽  
Physicochemical Characterization ◽  
Catalytic Performance ◽  
Environmental Pollutant ◽  
Bet Surface Area ◽  
Research Attention ◽  
Supported Gold Catalysts ◽  
Co Conversion ◽  
Ft Ir ◽  
Supported Gold

Noble metal nanomaterials have attracted mounting research attention for applications in diverse fields of catalysis, biology, and nanotechnology. In the present study, we have undertaken a detailed investigation on synthesis, characterization, and catalytic activity studies for CO oxidation by nanogold catalysts supported over CeO2 and CeO2-ZrO2 (1 : 1 mole ratio). The support systems were prepared by modified, simple precipitation technique and the Au supported samples were synthesized using deposition-precipitation with urea method. The physicochemical characterization was performed by XRD, ICP-AES, BET surface area, FT-IR, UV-Vis DRS, Raman Spectroscopy, TEM, and XPS techniques. Au/CeO2 catalyst showed more than 80% CO conversions at 30°C, whereas Au/CeO2-ZrO2 exhibited ~100% CO conversion at that temperature. The catalytic performance of Au catalysts is highly dependent on the nature of the support.

scholarly journals A diffusion anisotropy descriptor links morphology effects of H-ZSM-5 zeolites to their catalytic cracking performance

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Xiaoliang Liu ◽  
Jing Shi ◽  
Guang Yang ◽  
Jian Zhou ◽  
Chuanming Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Catalytic Cracking ◽  
Catalytic Performance ◽  
Zeolite Catalysts ◽  
Time Resolved ◽  
Cracking Performance ◽  
Morphology Effect ◽  
Ft Ir ◽  
The Difference ◽  
Dynamics Simulations

AbstractZeolite morphology is crucial in determining their catalytic activity, selectivity and stability, but quantitative descriptors of such a morphology effect are challenging to define. Here we introduce a descriptor that accounts for the morphology effect in the catalytic performances of H-ZSM-5 zeolite for C4 olefin catalytic cracking. A series of H-ZSM-5 zeolites with similar sheet-like morphology but different c-axis lengths were synthesized. We found that the catalytic activity and stability is improved in samples with longer c-axis. Combining time-resolved in-situ FT-IR spectroscopy with molecular dynamics simulations, we show that the difference in catalytic performance can be attributed to the anisotropy of the intracrystalline diffusive propensity of the olefins in different channels. Our descriptor offers mechanistic insight for the design of highly effective zeolite catalysts for olefin cracking.

The interplay between ceria particle size, reducibility, and ethanol oxidation activity of ceria-supported gold catalysts

2018 ◽  
Vol 3 (1) ◽  
pp. 75-85 ◽  
Author(s):  
Gregory M. Mullen ◽  
Edward J. Evans ◽  
Benjamin C. Siegert ◽  
Nathan R. Miller ◽  
Benjamin K. Rosselet ◽  
...  
Keyword(s):  
Particle Size ◽  
Catalytic Activity ◽  
Ethanol Oxidation ◽  
Storage Capacity ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage ◽  
Oxidation Activity ◽  
Supported Gold Catalysts ◽  
Supported Gold ◽  
Ceria Particle

The size of ceria particles influenced the activity of Au/CeO2 catalysts for ethanol oxidation, demonstrating a linear correlation between oxygen storage capacity and catalytic activity.

Carbon-Supported Gold Catalyst Modified by Doping with Ag for Cyclohexene Oxidation

2011 ◽  
Vol 236-238 ◽  
pp. 3046-3050
Author(s):  
Zhen Yu Cai ◽  
Ming Qiao Zhu ◽  
Yue Tang ◽  
Yi Liu ◽  
Huan Dai ◽  
...  
Keyword(s):  
Gold Catalyst ◽  
Catalytic Performance ◽  
Cyclohexene Oxide ◽  
Cyclohexene Oxidation ◽  
X Ray Diffraction ◽  
Efficient Catalyst ◽  
X Ray ◽  
Supported Gold Catalysts ◽  
Transmission Electron ◽  
Supported Gold

Carbon-supported gold catalysts Au/C were prepared by an impregnation-reduction method and modified by AgNO3to obtain bi-metallic catalysts Au-Ag/C, which were characterized by X-ray-diffraction (XRD) and Transmission Electron Microscope (TEM). Their catalytic performance was tested in the oxidation of cyclohexene in an autoclave without any solvent. The results showed that Ag doping can significantly enhance the catalytic performance of carbon-supported gold catalyst. Au(1.0 wt.%)-Ag(1.0 wt.%)/C has been found to be an efficient catalyst for the cyclohexene oxidation with a conversion of 27.6% at 80 °C and 0.4 MPa for 12 h while selectivity for ∑C6products (including cyclohexene oxide, 2-cyclohexene-1-ol, 2-cyclohexene-1-one and cyclohexane-1,2-diol) exceeding 88.9%, especially the selectivity of cyclohexane-1,2-diol up to 47.6%. Moreover, the effects of Au, Ag content on catalytic performance were also reported.

The Preparation of Stable TiO2 Nanotubes Supported Gold Catalysts and Their Catalytic Performance for CO Oxidation

2012 ◽  
Vol 4 (2) ◽  
pp. 118-122
Author(s):  
B.L. Zhu ◽  
W.L. Zhao ◽  
Q.W. Han ◽  
J. Chen ◽  
S.R. Wang ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Tio2 Nanotubes ◽  
Gold Catalysts ◽  
Catalytic Performance ◽  
Supported Gold Catalysts ◽  
Supported Gold

Synthesis of Al-Containing Mesoporous Molecular Sieves and their Catalytic Performance to Isomerization Reaction of Endo-Tetrahydrodicyclo-Pentadiene

2011 ◽  
Vol 233-235 ◽  
pp. 234-237 ◽  
Author(s):  
Sa Liu ◽  
Jian Wei Guo ◽  
Chu Fen Yang ◽  
Long Huan Li ◽  
Yi Hua Cui
Keyword(s):  
Catalytic Activity ◽  
Molecular Sieves ◽  
Catalytic Performance ◽  
Mesoporous Molecular Sieves ◽  
Isomerization Reaction ◽  
Inorganic Acid ◽  
Ft Ir ◽  
Desorption Isotherms ◽  
Adsorption Desorption ◽  
Mcm 41

Al-containing mesoporous molecular sieves(Al-MCM-41) were synthesized at ambient temperature. The structures of samples were characterized by XRD, N2-adsorption/desorption isotherms and FT-IR, etc. The evaluation results showed that Al-MCM-41 had higher catalytic activity for isomerization conversion of endo-tetrahydrodicyclo-pentadiene (endo-TCD) into exo-tetrahydrodicyclo-pentadiene (exo-TCD) and adamantane (AdH). Loading inorganic acid on the surface of Al-MCM-41 led increase of its catalytic activity and the yield of adamantane.

Preparation, Characterization and Catalytic Activity of Highly Dispersed Gold Catalyst

2014 ◽  
Vol 875-877 ◽  
pp. 304-307 ◽  
Author(s):  
Chun Xiu Liu ◽  
Mei Lin Jia ◽  
Yu Hong Bao ◽  
Jiang Wang ◽  
Sagala ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Gluconic Acid ◽  
Reduction Method ◽  
Gold Catalyst ◽  
Buffer Solution ◽  
Supported Gold Catalysts ◽  
Highly Dispersed ◽  
Supported Gold ◽  
Oxidation Of Glucose ◽  
Dispersed Gold

Highly dispersed supported gold catalysts have been prepared by solution reduction method using L-lysine as protection agents, and their catalytic activity was evaluated by the liquid phase catalytic oxidation reaction of glucose to gluconic acid. The results suggested that the Au/ZrO2 catalyst, exhibited high activity for the selective oxidation of glucose. At the reaction temperature of 323K, reaction time of 1h, with the NaCO3-NaHCO3 as buffer solution, the yield of gluconic acid was 100%.

Enhance catalytic activity for CO oxidation over titania supported gold catalysts that dispersed on SiO2

2011 ◽  
Vol 160 (1) ◽  
pp. 144-152 ◽  
Author(s):  
Zhao-Wen Wang ◽  
Xin V. Wang ◽  
D. Ying Zeng ◽  
Ming-Shu Chen ◽  
Hui-Lin Wan
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Gold Catalysts ◽  
Supported Gold Catalysts ◽  
Supported Gold
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