scholarly journals Selected Aspects of Hydrogen Production via Catalytic Decomposition of Hydrocarbons

Hydrogen ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 122-133
Author(s):  
Aleksey A. Vedyagin ◽  
Ilya V. Mishakov ◽  
Denis V. Korneev ◽  
Yury I. Bauman ◽  
Anton Yu. Nalivaiko ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Production Efficiency ◽  
Catalytic Decomposition ◽  
Nitrogen Adsorption ◽  
Methane Formation ◽  
Hydrogen Energy ◽  
Alternative Source ◽  
High Hydrogen ◽  
Carbon Deposits ◽  
Decomposition Of Hydrocarbons

Owing to the high hydrogen content, hydrocarbons are considered as an alternative source for hydrogen energy purposes. Complete decomposition of hydrocarbons results in the formation of gaseous hydrogen and solid carbonaceous by-product. The process is complicated by the methane formation reaction when the released hydrogen interacts with the formed carbon deposits. The present study is focused on the effects of the reaction mixture composition. Variations in the inlet hydrogen and methane concentrations were found to influence the carbon product’s morphology and the hydrogen production efficiency. The catalyst containing NiO (82 wt%), CuO (13 wt%), and Al2O3 (5 wt%) was prepared via a mechanochemical activating procedure. Kinetics of the catalytic process of hydrocarbons decomposition was studied using a reactor equipped with McBain balances. The effects of the process parameters were explored in a tubular quartz reactor with chromatographic analysis of the outlet gaseous products. In the latter case, the catalyst was loaded piecemeal. The texture and morphology of the produced carbon deposits were investigated by nitrogen adsorption and electron microscopy techniques.

scholarly journals Experimental Study on Water Electrolysis Using Cellulose Nanofluid

Fluids ◽  
2020 ◽  
Vol 5 (4) ◽  
pp. 166
Author(s):  
Dongnyeok Choi ◽  
Kwon-Yeong Lee
Keyword(s):  
Energy Source ◽  
Experimental Study ◽  
Hydrogen Production ◽  
Production Efficiency ◽  
Initial Temperature ◽  
Water Electrolysis ◽  
Metal Corrosion ◽  
Hydrogen Energy ◽  
High Hydrogen ◽  
Long Period

Hydrogen energy is considered to be a future energy source due to its higher energy density as compared to renewable energy and ease of storage and transport. Water electrolysis is one of the most basic methods for producing hydrogen. KOH and NaOH, which are currently used as electrolytes for water electrolysis, have strong alkalinity. So, it cause metal corrosion and can be serious damage when it is exposed to human body. Hence, experiments using cellulose nanofluid (CNF, C6H10O5) as an electrolyte were carried out to overcome the disadvantages of existing electrolytes and increase the efficiency of hydrogen production. The variables of the experiment were CNF concentration, anode material, voltage applied to the electrode, and initial temperature of the electrolyte. The conditions showing the optimal hydrogen production efficiency (99.4%) within the set variables range were found. CNF, which is not corrosive and has high safety, can be used for electrolysis for a long period of time because it does not coagulate and settle over a long period of time unlike other inorganic nanofluids. In addition, it shows high hydrogen production efficiency. So, it is expected to be used as a next-generation water electrolysis electrolyte.

scholarly journals Synthesis of narrow-band curled carbon nitride nanosheets with high specific surface area for hydrogen evolution from water splitting by low-temperature aqueous copolymerization to form copolymers

RSC Advances ◽  
2020 ◽  
Vol 10 (48) ◽  
pp. 28848-28855 ◽  
Author(s):  
Wenbo Liu ◽  
Zhendong Zhang ◽  
Deguang Zhang ◽  
Runwei Wang ◽  
Zongtao Zhang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Hydrogen Production ◽  
Specific Surface ◽  
Water Splitting ◽  
Carbon Nitride ◽  
Production Efficiency ◽  
Narrow Band ◽  
High Specific Surface Area ◽  
High Hydrogen ◽  
Carbon Nitride Nanosheets

Curled carbon nitride nanosheets with narrow-band gap for ultra-high hydrogen production efficiency.

scholarly journals A Process for Hydrogen Production from the Catalytic Decomposition of Formic Acid over Iridium—Palladium Nanoparticles

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3258
Author(s):  
Hamed M. Alshammari ◽  
Mohammad Hayal Alotaibi ◽  
Obaid F. Aldosari ◽  
Abdulellah S. Alsolami ◽  
Nuha A. Alotaibi ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Formic Acid ◽  
Activated Charcoal ◽  
Palladium Nanoparticles ◽  
Room Temperature ◽  
Catalytic Decomposition ◽  
Conversion Yield ◽  
Production Of Hydrogen ◽  
Commercial Applications

The present study investigates a process for the selective production of hydrogen from the catalytic decomposition of formic acid in the presence of iridium and iridium–palladium nanoparticles under various conditions. It was found that a loading of 1 wt.% of 2% palladium in the presence of 1% iridium over activated charcoal led to a 43% conversion of formic acid to hydrogen at room temperature after 4 h. Increasing the temperature to 60 °C led to further decomposition and an improvement in conversion yield to 63%. Dilution of formic acid from 0.5 to 0.2 M improved the decomposition, reaching conversion to 81%. The reported process could potentially be used in commercial applications.

Physical-Chemical and Thermodynamic Analyses of Ethanol Steam Reforming for Hydrogen Production

2006 ◽  
Vol 3 (3) ◽  
pp. 346-350 ◽  
Author(s):  
Antonio Carlos Caetano de Souza ◽  
José Luz-Silveira ◽  
Maria Isabel Sosa
Keyword(s):  
Hydrogen Production ◽  
Steam Reforming ◽  
Production Efficiency ◽  
Physical Chemical ◽  
Steam Reforming Of Ethanol ◽  
Thermodynamic Conditions ◽  
High Production ◽  
Exergetic Analysis ◽  
Global Reaction ◽  
Technical Features

Steam reforming is the most usual method of hydrogen production due to its high production efficiency and technological maturity. The use of ethanol for this purpose is an interesting option because it is a renewable and environmentally friendly fuel. The objective of this article is to present the physical-chemical, thermodynamic, and exergetic analysis of a steam reformer of ethanol, in order to produce 0.7Nm3∕h of hydrogen as feedstock of a 1kW PEMFC. The global reaction of ethanol is considered. Superheated ethanol reacts with steam at high temperatures producing hydrogen and carbon dioxide, depending strongly on the thermodynamic conditions of reforming, as well as on the technical features of the reformer system and catalysts. The thermodynamic analysis shows the feasibility of this reaction in temperatures about 206°C. Below this temperature, the reaction trends to the reactants. The advance degree increases with temperature and decreases with pressure. Optimal temperatures range between 600 and 700°C. However, when the temperature attains 700°C, the reaction stability occurs, that is, the hydrogen production attains the limit. For temperatures above 700°C, the heat use is very high, involving high costs of production due to the higher volume of fuel or electricity used. The optimal pressure is 1atm., e.g., at atmospheric pressure. The exergetic analysis shows that the lower irreversibility is attained for lower pressures. However, the temperature changes do not affect significantly the irreversibilities. This analysis shows that the best thermodynamic conditions for steam reforming of ethanol are the same conditions suggested in the physical-chemical analysis.

A newly isolated Rhodobacter sphaeroides HY01 with high hydrogen production performance

2014 ◽  
Vol 39 (19) ◽  
pp. 10051-10060 ◽  
Author(s):  
Honghui Yang ◽  
Jing Zhang ◽  
Xueqing Wang ◽  
Feng Jiangtao ◽  
Wei Yan ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Rhodobacter Sphaeroides ◽  
Production Performance ◽  
High Hydrogen

Control of the outer diameter of thin carbon nanotubes synthesized by catalytic decomposition of hydrocarbons

2000 ◽  
Vol 317 (1-2) ◽  
pp. 71-76 ◽  
Author(s):  
I Willems ◽  
Z Kónya ◽  
J.-F Colomer ◽  
G Van Tendeloo ◽  
N Nagaraju ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Catalytic Decomposition ◽  
Outer Diameter ◽  
Thin Carbon ◽  
Decomposition Of Hydrocarbons

scholarly journals Geometrical flexibility of platinum nanoclusters: impacts on catalytic decomposition of ethylene glycol

2017 ◽  
Vol 19 (42) ◽  
pp. 28596-28603 ◽  
Author(s):  
Mehdi Mahmoodinia ◽  
Thuat T. Trinh ◽  
Per-Olof Åstrand ◽  
Khanh-Quang Tran
Keyword(s):  
Hydrogen Production ◽  
Ethylene Glycol ◽  
Catalytic Decomposition ◽  
Structural Flexibility ◽  
Biomass Materials ◽  
Coordinative Unsaturation ◽  
Platinum Nanoclusters

The structural flexibility and the coordinative unsaturation of Pt13clusters make them a better catalyst than a Pt surface for hydrogen production from biomass materials.

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