Cr- and Ti-Based Spinels as Materials for Anodic Catalyst Support in PEM Electrolysis Cells: Assessing Corrosion Stability and Support Role in Catalyst Activity of Corrosion Stable Ceramics

Decomposition of methane into carbon and hydrogen over Cu/Ni supported catalysts was investigated. The catalytic activities and the lifetimes of the catalysts were studied. Cu/Ni supported on TiO2 showed high activity and long lifetime for the reaction. Transmission electron microscopy (TEM) studies revealed the relationship between the catalyst activity and the formation of the filamentous carbon over the catalyst after methane decomposition. While different types of filamentous carbon formed on the various Cu/Ni supported catalysts, an attractive carbon nanotubes was observed in the Cu/Ni supported on TiO2. Key Words: Methane decomposition, carbon nanotube, Cu/Ni supported catalysts.

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Low-Temperature Oxidation of CO in Smoke: A Review

Beiträge zur Tabakforschung International/Contributions to Tobacco Research ◽

10.2478/cttr-2013-0820 ◽

2006 ◽

Vol 22 (2) ◽

pp. 89-106 ◽

Cited By ~ 1

Author(s):

AJ Dyakonov ◽

EA Robinson

Keyword(s):

Low Temperature ◽

Co Oxidation ◽

Diffusion Processes ◽

Catalyst Activity ◽

Catalyst Support ◽

Catalyst Preparation ◽

Fast Diffusion ◽

Oxidation Of Co ◽

Oxidation Activity ◽

Temperature Oxidation

AbstractThe low-temperature catalytic oxidation of CO has been reviewed, targeting its possible application to cigarette smoke. The treatment of CO in smoke by using a filter-packed catalyst is extremely complicated by the presence of a variety of chemically active gaseous compounds, a particulate phase, the high velocity of pulsing smoke flow, and ambient temperature. The relevant mechanisms of catalysis and the catalyst preparation variables that could help to overcome these problems are considered. Possible contributors to the overall kinetics that must include variety of diffusion processes were briefly discussed. The chemisorption of O2, CO and CO2 on Pd, Pt and Au and on partially reducible supports, surface reactions and oscillations of the CO oxidation rate were analyzed. The effects of the surface structure and electronic properties of the catalyst support, preparation conditions and presence of a second transition metal on the projected CO oxidation activity of the catalysts in smoke are also discussed. The reviewed catalyst preparation approaches can solve the low-temperature catalyst activity problem. However, more work is required to stabilize this activity of an air-exposed catalyst to provide a necessary shelf life for a cigarette. The greatest challenge seems to be a particular phase - exclusive selectivity that would not contradict with the necessary fast diffusion of gases through the catalyst pores.

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Highly Efficient Solar Hydrogen Generation-An Integrated Concept Joining III-V Solar Cells with PEM Electrolysis Cells

Energy Technology ◽

10.1002/ente.201300116 ◽

2014 ◽

Vol 2 (1) ◽

pp. 43-53 ◽

Cited By ~ 33

Author(s):

Sebastian Rau ◽

Severin Vierrath ◽

Jens Ohlmann ◽

Arne Fallisch ◽

David Lackner ◽

...

Keyword(s):

Solar Cells ◽

Hydrogen Generation ◽

Solar Hydrogen ◽

Highly Efficient ◽

Electrolysis Cells ◽

Pem Electrolysis ◽

Integrated Concept

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Role of catalyst support over PdO–NiO catalysts on catalyst activity and stability for oxy-CO2 reforming of methane

Applied Catalysis A General ◽

10.1016/j.apcata.2011.06.002 ◽

2011 ◽

Vol 402 (1-2) ◽

pp. 176-187 ◽

Cited By ~ 61

Author(s):

U. Oemar ◽

K. Hidajat ◽

S. Kawi

Keyword(s):

Catalyst Activity ◽

Catalyst Support ◽

Co2 Reforming ◽

Co2 Reforming Of Methane

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Oxygen‐Deficient Ti 0.9 Nb 0.1 O 2‐x as an Efficient Anodic Catalyst Support for PEM Water Electrolyzer

ChemCatChem ◽

10.1002/cctc.201900090 ◽

2019 ◽

Vol 11 (10) ◽

pp. 2511-2519 ◽

Cited By ~ 3

Author(s):

Hong Lv ◽

Sen Wang ◽

Chuanpu Hao ◽

Wei Zhou ◽

Jiakun Li ◽

...

Keyword(s):

Catalyst Support ◽

Anodic Catalyst ◽

Pem Water Electrolyzer

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A Review on the Hydroisomerisasion of n-Parafins over Supported Metal Catalysts

Jurnal Rekayasa Proses ◽

10.22146/jrekpros.67587 ◽

2021 ◽

Vol 15 (2) ◽

pp. 141

Author(s):

Muhammad Safaat ◽

Indri Badria Adilina ◽

Silvester Tursiloadi

Keyword(s):

Active Sites ◽

Noble Metals ◽

Catalyst Activity ◽

Catalyst Support ◽

Metal Catalyst ◽

Supported Metal Catalysts ◽

Reaction Conditions ◽

High Level ◽

Long Chain ◽

Supported Metal

Catalytic hydroisomerization of n-paraffin aims to produce branched paraffin isomers and suppress cracking reactions in the production of the low cloud point of biodiesel. The development of the type of metal and catalyst support, amount of metal loading, and reaction conditions are important to increase the catalyst activity. A high performace catalyst for hydroisomerization bears bifunctional characteristics with a high level of hydrogenation active sites and low acidity, maximizing the progress of hydroisomerization compared to the competitive cracking reaction. In addition, a catalyst support with smaller pore size can hinder large molecular structure isoparaffins to react on the acid site in the pore thus providing good selectivity for converting n-paraffin. Catalysts loaded with noble metals (Pt or Pd) showed significantly higher selectivity for hydroisomerization than non-noble transition metals such as Ni, Co, Mo and W. The reaction temperature and contact time are also important parameters in hydroisomerization of long chain paraffin, because long contact times and high temperatures tend to produce undesired byproducts of cracking. This review reports several examples of supported metal catalyst used in the hydroisomerization of long chain hydrocarbon n-paraffins under optimized reaction conditions, providing the best isomerization selectivity results with the lowest amount of byproducts. The role of various metals and their supports will be explained mainly for bifunctional catalysts.

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Catalytic Pyrolysis of Municipal Solid Waste: Effects of Pyrolysis Parameters

BULLETIN OF CHEMICAL REACTION ENGINEERING AND CATALYSIS ◽

10.9767/bcrec.16.2.10499.342-352 ◽

2021 ◽

Vol 16 (2) ◽

pp. 342-352

Author(s):

Hamad AlMohamadi ◽

Abdulrahman Aljabri ◽

Essam R.I. Mahmoud ◽

Sohaib Z. Khan ◽

Meshal S. Aljohani ◽

...

Keyword(s):

Municipal Solid Waste ◽

Solid Waste ◽

Catalyst Activity ◽

Catalyst Support ◽

Relative Yield ◽

Catalyst Loading ◽

Pyrolysis Oil ◽

So2 Emissions ◽

Experimental Conditions ◽

Liquid Yield

Burning municipal solid waste (MSW) increases CO2, CH4, and SO2 emissions, leading to an increase in global warming, encouraging governments and researchers to search for alternatives. The pyrolysis process converts MSW to oil, gas, and char. This study investigated catalytic and noncatalytic pyrolysis of MSW to produce oil using MgO-based catalysts. The reaction temperature, catalyst loading, and catalyst support were evaluated. Magnesium oxide was supported on active carbon (AC) and Al2O3 to assess the role of support in MgO catalyst activity. The liquid yields varied from 30 to 54 wt% based on the experimental conditions. For the noncatalytic pyrolysis experiment, the highest liquid yield was 54 wt% at 500 °C. The results revealed that adding MgO, MgO/Al2O3, and MgO/AC declines the liquid yield and increases the gas yield. The catalysts exhibited significant deoxygenation activity, which enhances the quality of the pyrolysis oil and increases the heating value of the bio-oil. Of the catalysts that had high deoxygenation activity, MgO/AC had the highest relative yield. The loading of MgO/AC varied from 5 to 30 wt% of feed to the pyrolysis reactor. As the catalyst load increases, the liquid yield declines, while the gas and char yields increase. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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