scholarly journals Inside Cover: Directing the Cleavage of Ester C−O Bonds by Controlling the Hydrogen Availability on the Surface of Coprecipitated Pd/Fe3 O4 (ChemCatChem 8/2016)

ChemCatChem ◽  
2016 ◽  
Vol 8 (8) ◽  
pp. 1419-1419
Author(s):  
Daniela Cozzula ◽  
Alessandro Vinci ◽  
Francesco Mauriello ◽  
Rosario Pietropaolo ◽  
Thomas E. Müller
Keyword(s):  
Hydrogen Availability

Liquefaction behaviour of a Spanish subbituminous A coal under different conditions of hydrogen availability

1998 ◽  
Vol 58 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Isabel de Marco Rodriguez ◽  
M.J. Chomón ◽  
B. Caballero ◽  
P.L. Arias ◽  
J.A. Legarreta
Keyword(s):  
Hydrogen Availability

scholarly journals Demonstration and analysis of a steam reforming process driven with solar heat using molten salts as heat transfer fluid

2022 ◽  
Vol 334 ◽  
pp. 01004
Author(s):  
Alberto Giaconia ◽  
Giampaolo Caputo ◽  
Primo Di Ascenzi ◽  
Giulia Monteleone ◽  
Luca Turchetti
Keyword(s):  
Heat Transfer ◽  
Molten Salt ◽  
Steam Reforming ◽  
Molten Salts ◽  
Experimental Validation ◽  
Low Cost ◽  
Water Electrolysis ◽  
Pilot Scale ◽  
Heat Transfer Fluid ◽  
Hydrogen Availability

Solar reforming of biogas or biomethane represents an example hydrogen production from the combination of renewable sources such as biomass and solar energy. Thanks to its relatively low-cost and flexibility, solar-reforming can represent a complementary source of hydrogen where/when the demand exceeds the green hydrogen availability from water electrolysis powered by PV or wind. Molten salts can be used as heat transfer fluid and heat storage medium in solar-driven steam reforming. The main units of the process have been developed at the pilot scale and experimentally tested in a molten salt experimental loop at ENEA-Casaccia research center: a molten salt heater and a molten salt membrane reformer. After experimental validation, techno-economic studies have been carried out to assess the solar reforming technology on commercial scale and exploitation opportunities have been analysed.

scholarly journals The Effect of Different Concentrations of Total Polyphenols from Paulownia Hybrid Leaves on Ruminal Fermentation, Methane Production and Microorganisms

Animals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2843
Author(s):  
Julia Puchalska ◽  
Małgorzata Szumacher-Strabel ◽  
Amlan Kumar Patra ◽  
Sylwester Ślusarczyk ◽  
Min Gao ◽  
...  
Keyword(s):  
Methane Production ◽  
Crude Protein ◽  
Dry Matter ◽  
Protein Concentration ◽  
Microbial Population ◽  
Ruminal Fermentation ◽  
Total Polyphenols ◽  
Methanogen Population ◽  
Hydrogen Availability

This experiment was conducted to study the effects of different concentrations of polyphenols of Paulownia Clon In Vitro 112® leaves or their particular parts on in vitro ruminal fermentation, methane production and microbial population. Paulownia leaves with high (PLH; 31.35 mg/g dry matter (DM)), medium (PLM; 26.94 mg/g DM), and low level of polyphenols (PLL; 11.90 mg/g DM) were used from three plantation areas. Lamina (PLLA; 33.63 mg/g DM) and twigs (PLT; 2.53 mg/g DM) of leaves were also collected from the PLM plantation. The chemical analyses of Paulownia leaves indicated that the content of the most basic nutrients (e.g., crude protein concentration of 185 g/kg of DM) were similar to dehydrated alfalfa. The in vitro results showed that the use of Paulownia leaves with the highest content of total polyphenols (PLH and PLLA) decreased methane production, methanogens numbers, and acetate to propionate ratio. In PLT, lowered methane production was followed by reduced substrate degradability and volatile fatty acid (VFA) concentration along with higher acetate to propionate ratio. Therefore, reduction of methane production in PLH and PLLA was attributed to the lowered methanogen population, whereas in PLT it was caused by decreased substrate degradability with the resultant of limited hydrogen availability to the methanogens.

Directing the Cleavage of Ester C−O Bonds by Controlling the Hydrogen Availability on the Surface of Coprecipitated Pd/Fe3 O4

ChemCatChem ◽  
2016 ◽  
Vol 8 (8) ◽  
pp. 1515-1522 ◽  
Author(s):  
Daniela Cozzula ◽  
Alessandro Vinci ◽  
Francesco Mauriello ◽  
Rosario Pietropaolo ◽  
Thomas E. Müller
Keyword(s):  
Hydrogen Availability

Reducing rumen methane emissions through elimination of rumen protozoa

1999 ◽  
Vol 50 (8) ◽  
pp. 1321 ◽  
Author(s):  
R. S. Hegarty
Keyword(s):  
Dry Matter ◽  
Methane Emissions ◽  
Commercial Application ◽  
Partial Pressure Of Oxygen ◽  
Host Animal ◽  
Fatty Acid Production ◽  
Fermenting Bacteria ◽  
Methanogen Population ◽  
Hydrogen Availability ◽  
Ciliate Protozoa

Methanogens living on and within rumen ciliate protozoa may be responsible for up to 37% of the rumen methane emissions. In the absence of protozoa, rumen methane emissions are reduced by an average of 13% but this varies with diet. Decreased methane emissions from the protozoa-free rumen may be a consequence of: (1) reduced ruminal dry matter digestion; (2) a decreased methanogen population; (3) an altered pattern of volatile fatty acid production and hydrogen availability; or (4) increased partial pressure of oxygen in the rumen. The decline in methanogenesis associated with removal of protozoa is greatest on high concentrate diets and this is in keeping with protozoa being relatively more important sources of hydrogen on starch diets, because many starch-fermenting bacteria do not produce H2. Because protozoa also decrease the supply of protein available to the host animal, their elimination offers benefits in both decreasing greenhouse gas emissions and potentially increasing livestock production. Strategies for eliminating protozoa are reviewed. None of the available techniques is considered practical for commercial application and this should be addressed.

scholarly journals Active Power Control based on Hydrogen Availability in a Storage Power Plant

2020 ◽  
Vol 53 (2) ◽  
pp. 12708-12713
Author(s):  
Nayeemuddin Ahmed ◽  
Paul Gerdun ◽  
Harald Weber
Keyword(s):  
Power Plant ◽  
Power Control ◽  
Active Power ◽  
Active Power Control ◽  
Hydrogen Availability
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