EFFECTS OF CATALYST PREPARATION CONDITIONS ON NANO-GOLD DEPOSITED ON ZSM-5 FOR CO OXIDATION

2008 ◽  
Vol 22 (18n19) ◽  
pp. 3278-3288 ◽  
Author(s):  
A. H. SHAHBAZI KOOTENAEI ◽  
M. KAZEMEINI ◽  
H. KAZEMIAN
Keyword(s):  
Catalytic Activity ◽  
Acid Solution ◽  
Co Oxidation ◽  
Catalyst Preparation ◽  
Effect Of Temperature ◽  
Chloroauric Acid ◽  
Preparation Conditions ◽  
Activity Effect ◽  
Nano Gold ◽  
Co Conversion

Calcined Na - ZSM -5 zeolite was directly reacted with the chloroauric acid solution in different concentrations and pH for gold loading process. The synthesized Au / ZSM -5 catalyst was then characterized using XRD, BET, SEM, TEM and EDS techniques. In order to evaluate its catalytic activity, effect of temperature on CO conversion was investigated.

Highly active and stable Au@CuxO core–shell nanoparticles supported on alumina for carbon monoxide oxidation at low temperature

RSC Advances ◽  
2016 ◽  
Vol 6 (79) ◽  
pp. 75126-75132 ◽  
Author(s):  
Weining Zhang ◽  
Qingguo Zhao ◽  
Xiaohong Wang ◽  
Xiaoxia Yan ◽  
Sheng Han ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Low Temperature ◽  
Co Oxidation ◽  
Room Temperature ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Highly Active ◽  
Co Conversion ◽  
Core Shell Nanoparticles

Au@CuxO core–shell nanoparticles and Au@CuxO/Al2O3 used for CO oxidation at low temperature are prepared. CO conversion on Au@CuxO/Al2O3 can reach to 38% at room temperature and the catalytic activity remains unchanged after 108 hours reaction.

scholarly journals Synthesis and characterization of perovskite-supported CoNi catalyst for CO oxidation via exsolution

2021 ◽  
Vol 1195 (1) ◽  
pp. 012029
Author(s):  
G L Lew ◽  
N Ibrahim ◽  
S Abdullah ◽  
W R W Daud ◽  
W K W Ramli
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Production Rate ◽  
Perovskite Oxide ◽  
Metal Catalyst ◽  
Solid State Method ◽  
Cobalt Nickel ◽  
Co Conversion ◽  
Parameter Modification ◽  
Lower Temperature

Abstract The introduction of perovskite oxide as catalysts alternative has increased the worldwide interest due to its advantages such as its versatility to accommodate different transition metals. This study set out to evaluate the catalytic activity of CO oxidative perovskite catalysts (LCCNTO), fabricated via solid-state method and reduced under various reducing condition for the exsolution of the active metals, Cobalt-Nickel (CoNi) from the perovskite lattice. The effect of reducing parameter modification towards the catalytic activity of the fabricated LCCNTO was discussed in terms of CO conversion and CO2 production rate. Through the light-off test, the sample that reduced with the longest deration (S2T10H6-R5H5) showed the highest CO conversion of 45.45% and CO2 production rate of 0.1409 × 10−4 mol s− 1g−1 at the reaction temperature of 500 °C. Not only that, it was discovered that by controlling the reducing duration, the initiate temperature for the reaction to occur was lowered from 360 °C (S2T10H6-R5H3) enabling the reaction to occur at lower temperature at 280 °C in S2T10H6-R5H5. Under the same reducing temperature, the CO2 production of sample reduced for 200 minutes (S2T10H6-R5H3) started at 360 °C but as the reducing duration increased to 300 minutes (S2T10H6-R5H5), the CO oxidation initiated at a much lower temperature of 280 °C. Although LCCNTO catalyst still suffer from similar deterioration as the other reported base metal catalyst, but tuning the reducing duration given to a sample, it greatly affects the initiation temperature for the reaction to occur.

Charaterization and Catalytic Activity of CuO and NiO Supported on ZrO2 for CO Low Temperature Oxidation

2013 ◽  
Vol 842 ◽  
pp. 237-241 ◽  
Author(s):  
Zhi Chen ◽  
Yi Long Xie ◽  
Jin Xing Qiu ◽  
Zhong He Chen
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Co Oxidation ◽  
High Activity ◽  
Conversion Efficiency ◽  
Sol Gel ◽  
Coprecipitation Method ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Co Conversion

ZrO2 support has been prepared by sol-gel and coprecipitation method. CuO and NiO were supported on the supports and they were the activity metals for the catalysts. The CO conversion was tested. The light-off temperature of CO oxidation was 22°C and CO conversion efficiency was up to 50% at 169°C. The prepared catalysts of Cu, Ni supported on ZrO2-A had a high activity for CO oxidation at low temperature.

Composition, Structure, and Catalytic Activity of SiO2+TiO2/Ti and MnOx+SiO2+TiO2/Ti Composites Formed by Combination of the Methods of Plasma Electrolytic Oxidation, Impregnation and Annealing

2015 ◽  
Vol 245 ◽  
pp. 238-242 ◽  
Author(s):  
Marina S. Vasilyeva ◽  
V.S. Rudnev ◽  
Alexander Yu. Ustinov
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Plasma Electrolytic Oxidation ◽  
Manganese Oxides ◽  
Outer Part ◽  
Oxide Layers ◽  
Co Conversion ◽  
Electrolytic Oxidation ◽  
Composition Structure ◽  
Plasma Electrolytic

New data on the structure of silicon-containing oxide layers SiO2+TiO2 on titanium formed by the method of plasma electrolytic oxidation (PEO) as well as on the structure and catalytic activity in CO oxidation of MnOx+SiO2+TiO2/Ti composites formed on their basis using impregnation and annealing methods have been obtained. It has been demonstrated that silicon and titanium are rather homogeneously distributed over the SiO2+TiO2 coating bulk. The coating outer part is silicon-enriched titanium-depleted. The MnOx+SiO2+TiO2/Ti composites catalyze the CO conversion at temperatures above 100°C. Nanowhiskers consisting predominantly of manganese oxides have been found on the surface of the MnOx+SiO2+TiO2/Ti composites.

CO-OXIDATION CATALYZED BY NANOCRYSTALLINE CeO2 PARTICLES WITH DIFFERENT MORPHOLOGIES

2008 ◽  
Vol 15 (01n02) ◽  
pp. 123-131 ◽  
Author(s):  
W. Y. PONG ◽  
H. Y. CHANG ◽  
H. I. CHEN ◽  
J. R. CHANG
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Oxidation Reaction ◽  
Degree Of Crystallinity ◽  
Precipitation Method ◽  
The Novel ◽  
Morphological Effect ◽  
Co Oxidation Reaction ◽  
Co Conversion ◽  
Structure Morphology

Nanocrystalline cerium oxide ( CeO 2) particles prepared by the novel two-stage precipitation method were used for the catalysis of CO oxidation. Firstly, two shapes, i.e. particulate (P-) and needle-like (N-), CeO 2 nanoparticles were formed via proposed temperature-arranged routes. The crystalline structure, morphology, particle size, and surface area of samples were characterized by using XRD, TEM, HRTEM, and BET techniques. Furthermore, the morphological effect of the CeO 2 samples on the catalytic activity of CO oxidation was investigated. From the experimental results, it indicated that the prepared samples were all nonporous and fcc-structured CeO 2. The CeO 2 particles, as precipitating at 90°C for 5 min and then aging at 90°C, were particulate, whereas they were needle-like by aging at 0°C. The CO oxidation reaction showed that the catalytic activity of N- CeO 2 nanoparticles was higher than that of P- CeO 2, attributing from the exposed higher-energy {100} and {110} facets for N- CeO 2 nanoparticles. Moreover, the calcined samples with higher degree of crystallinity showed further promotion in catalytic activity. It was also worthy to note, that by replacing the CeO 2 catalyst by Pd / CeO 2, a large increase in the CO conversion was found, especially catalyzed by Pd /N- CeO 2.

Catalytic Decomposition of CCl2F2 over Solid Base Na2O/ZrO2

2013 ◽  
Vol 634-638 ◽  
pp. 494-499
Author(s):  
Tian Cheng Liu ◽  
Ping Ning ◽  
Hong Bin Wang ◽  
Lin Zhuan Ma ◽  
Bin Li
Keyword(s):  
Catalytic Activity ◽  
Water Vapor ◽  
Fixed Bed ◽  
Catalytic Decomposition ◽  
Catalyst Preparation ◽  
Fixed Bed Reactor ◽  
Solid Base ◽  
High Concentration ◽  
Zro2 Content ◽  
Preparation Conditions

Catalytic decomposition of dichlorodifluoromethane (CCl2F2) in the presence of water vapor and oxygen was studied over a series of solid base that have different ZrO2 content using a fixed-bed reactor. CO2 and CClF3 were the main-products and no CO was detected as by-product. The decomposition activity depended on the calcination temperature and the Zr:Na. Calcined at 600 °C and Zr:Na=1:0.35 were the best catalyst preparation conditions. Adopting low concentration of oxygen and CCl2F2 and high concentration of water vapor is preferable to the achievement of high conversion of CCl2F2 and selectivity for CO2. The catalytic activity of Na2O/ZrO2 remained steady for 120 h on stream.

scholarly journals Influence of Preparation Conditions of Mixed-valence Con+/ZSM-5 Zeolites on Their Adsorption and Catalytic Properties in CO Oxidation

2002 ◽  
Vol 20 (4) ◽  
pp. 371-379 ◽  
Author(s):  
Ludmila P. Oleksenko ◽  
Vitaly K. Yatsimirsky ◽  
Larisa V. Lutsenko
Keyword(s):  
Thermal Stability ◽  
Catalytic Activity ◽  
Co Oxidation ◽  
Catalytic Properties ◽  
Mixed Valence ◽  
Adsorption Properties ◽  
Oxidation Of Co ◽  
Coordination State ◽  
Zeolite Framework ◽  
Preparation Conditions

The adsorption properties, thermal stability and catalytic activity in CO oxidation of Co2+, Co3+-containing ZSM-5 zeolite systems with different metal loadings were studied. Treatment in H2 caused an increase in the activity of Co2+/ZSM-5 and Co2+–Co3+/ZSM-5 systems, but the activity of the Co3+/ZSM-5 system remained unchanged, demonstrating the very low reducibility of the [Co(NH3)6]3+ ion when embedded in the zeolite framework. The catalytic activity changed in the order: Co3+/ZSM-5 < Co2+–Co3+/ZSM-5 < Co2+/ZSM-5. A correlation was established between the temperature necessary for the total decomposition of the cobalt salts introduced into the zeolite, the acidity, the coordination state of the Co ions and the catalytic activity of the cobalt-containing zeolites.

scholarly journals Fabrication of CeO2–MO x (M = Cu, Co, Ni) composite yolk–shell nanospheres with enhanced catalytic properties for CO oxidation

2017 ◽  
Vol 8 ◽  
pp. 2425-2437 ◽  
Author(s):  
Ling Liu ◽  
Jingjing Shi ◽  
Hongxia Cao ◽  
Ruiyu Wang ◽  
Ziwu Liu
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Catalytic Performance ◽  
Ethanol Solution ◽  
Oxidation Catalyst ◽  
Synthesis Process ◽  
Oxide Systems ◽  
Uniform Size ◽  
Colloidal Spheres ◽  
Co Conversion

CeO2–MO x (M = Cu, Co, Ni) composite yolk–shell nanospheres with uniform size were fabricated by a general wet-chemical approach. It involved a non-equilibrium heat-treatment of Ce coordination polymer colloidal spheres (Ce-CPCSs) with a proper heating rate to produce CeO2 yolk–shell nanospheres, followed by a solvothermal treatment of as-synthesized CeO2 with M(CH3COO)2 in ethanol solution. During the solvothermal process, highly dispersed MO x species were decorated on the surface of CeO2 yolk–shell nanospheres to form CeO2–MO x composites. As a CO oxidation catalyst, the CeO2–MO x composite yolk–shell nanospheres showed strikingly higher catalytic activity than naked CeO2 due to the strong synergistic interaction at the interface sites between MO x and CeO2. Cycling tests demonstrate the good cycle stability of these yolk–shell nanospheres. The initial concentration of M(CH3COO)2·xH2O in the synthesis process played a significant role in catalytic performance for CO oxidation. Impressively, complete CO conversion as reached at a relatively low temperature of 145 °C over the CeO2–CuO x -2 sample. Furthermore, the CeO2–CuO x catalyst is more active than the CeO2–CoO x and CeO2–NiO catalysts, indicating that the catalytic activity is correlates with the metal oxide. Additionally, this versatile synthesis approach can be expected to create other ceria-based composite oxide systems with various structures for a broad range of technical applications.

A mullite oxide catalyst of SmMn2O5 for three-way catalysis: synthesis, characterization, and catalytic activity evaluation

RSC Advances ◽  
2016 ◽  
Vol 6 (70) ◽  
pp. 65950-65959 ◽  
Author(s):  
Pengfei Zhao ◽  
Pengfei Yu ◽  
Zijian Feng ◽  
Rong Chen ◽  
Liwei Jia ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Oxide Catalyst ◽  
Oxidation Activity ◽  
Activity Evaluation ◽  
Co Conversion ◽  
Three Way Catalysis

CO conversion as a function of temperature for SMO and LCO is shown in the graphical abstract image. SMO reached 95% conversion at 150 °C and showed a better CO oxidation activity than LCO.

scholarly journals Effect of Preparation Conditions on the Catalytic Activity of CuMnOx Catalysts for CO Oxidation

2017 ◽  
Vol 12 (3) ◽  
pp. 437 ◽  
Author(s):  
Subhashish Dey ◽  
Ganesh Chandra Dhal ◽  
Devendra Mohan ◽  
Ram Prasad
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Precipitation Method ◽  
Oxidation Of Co ◽  
Calcination Time ◽  
Drying Time ◽  
Molar Ratios ◽  
Preparation Conditions ◽  
Copper Manganese ◽  
Co Precipitation

The hopcalite (CuMnOx) catalyst is a well-known catalyst for oxidation of CO at ambient temperature. It has prepared by co-precipitation method and the preparation parameters were like Copper/Manganese (Cu:Mn) molar ratios, drying temperature, drying time, calcination temperature and calcination time has an influence on activity of the resultant catalyst. The activity of the catalyst was measured in flowing air calcinations (FAC) conditions. The reaction temperature was increased from ambient to a higher value at which complete oxidation of CO was achieved. The particle size, weight of catalyst and CO flow rate in the air were also influenced by the activity of the catalyst for CO oxidation. The characterizations of the catalysts were done by several techniques like XRD, FTIR, BET, SEM-EDX and XPS. These results were interpreted in terms of the structure of the active catalyst. The main aim of this paper was to identify the optimum preparation conditions of CuMnOx catalyst with respect to the performance of catalyst for CO oxidation. Copyright © 2017 BCREC Group. All rights reservedReceived: 9th January 2017; Revised: 24th May 2017; Accepted: 25th May 2017; Available online: 27th October 2017; Published regularly: December 2017How to Cite: Dey, S., Dhal, G.C., Mohan, D., Prasad, R. (2017). Effect of Preparation Conditions on the Catalytic Activity of CuMnOx Catalysts for CO Oxidation. Bulletin of Chemical Reaction Engineering & Catalysis, 12 (3): 431-451 (doi:10.9767/bcrec.12.3.900.437-451) 

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