Ecological Aspects of Methane Oxidation, a Key Determinant of Global Methane Dynamics

1992 ◽  
pp. 431-468 ◽  
Author(s):  
Gary M. King
Keyword(s):  
Methane Oxidation ◽  
Ecological Aspects ◽  
Methane Dynamics

Effect of temperature on methane dynamics and evaluation of methane oxidation kinetics in shallow Arctic Alaskan lakes

Hydrobiologia ◽  
2013 ◽  
Vol 721 (1) ◽  
pp. 209-222 ◽  
Author(s):  
Dendy D. Lofton ◽  
Stephen C. Whalen ◽  
Anne E. Hershey
Keyword(s):  
Methane Oxidation ◽  
Oxidation Kinetics ◽  
Effect Of Temperature ◽  
Methane Dynamics

Methane Oxidation on a Coverage Layer Study

2008 ◽  
Author(s):  
Juliana L. Rose ◽  
Pedro Paulo F. Gouvêa ◽  
Cláudio F. Mahler
Keyword(s):  
Methane Oxidation

ECOLOGICAL ASPECTS OF DAGESTAN NATURAL WATER PROTECTION

2019 ◽  
Vol 77 (2) ◽  
pp. 55-59
Author(s):  
T.I., Abdulganieva ◽  
◽  
Sh.G. Samedov ◽  
S.A., Mamaev ◽  
A.S. Kurbanismailova ◽  
...  
Keyword(s):  
Natural Water ◽  
Water Protection ◽  
Ecological Aspects

MEDICAL-ECOLOGICAL ASPECTS OF RESISTANCE MICROFLORA IN CHILDREN WITH ACUTE INFLAMMATORY DISEASES OF THE UPPER RESPIRATORY TRACT

2017 ◽  
Vol 212 (12) ◽  
pp. 117-119
Author(s):  
M.V. Fomina ◽  
◽  
E.A. Mikhailova ◽  
N.P. Kuznetsova ◽  
A.I. Morozovа ◽  
...  
Keyword(s):  
Respiratory Tract ◽  
Inflammatory Diseases ◽  
Upper Respiratory Tract ◽  
Ecological Aspects ◽  
Upper Respiratory

Ultra-Low Amounts of Palladium (0.005-0.05 Wt% Pd) Supported on Titania: Remarkable Low-Temperature Activity for NO Reduction with CO and Structure-Function Property Relationships in Methane Oxidation

2020 ◽  
Author(s):  
Konstantin Khivantsev ◽  
Libor Kovarik ◽  
Nicholas R. Jaegers ◽  
János Szanyi ◽  
Yong Wang
Keyword(s):  
Nitric Oxide ◽  
Carbon Monoxide ◽  
Methane Oxidation ◽  
Steam Reforming ◽  
Methane Steam Reforming ◽  
Oxide Reduction ◽  
Water Steam ◽  
Methane Steam ◽  
Anatase Titania ◽  
Nitric Oxide Reduction

<p>Atomically dispersed Pd +2 cations with ultra-dilute loading of palladium (0.005-0.05 wt%) were anchored on anatase titania and characterized with FTIR, microscopy and catalytic tests. CO infrared adsorption produces a sharp, narrow mono-carbonyl Pd(II)-CO band at ~2,130 cm<sup>-1</sup> indicating formation of highly uniform and stable Pd+2 ions on anatase titania. The 0.05 wt% Pd/TiO<sub>2</sub> sample was evaluated for methane combustion under dry and wet (industrially relevant) conditions in the presence and absence of carbon monoxide. Notably, we find the isolated palladium atoms respond dynamically upon oxygen concentration modulation (switching-on and switching off). When oxygen is removed from the wet methane stream, palladium ions are reduced to metallic state by methane and catalyze methane steam reforming instead of complete methane oxidation. Re-admission of oxygen restores Pd<sup>+2</sup> cations and switches off methane steam reforming activity. Moreover, 0.05 wt% Pd/TiO<sub>2</sub> is a competent CO oxidation catalyst in the presence of water steam with 90% CO conversion and TOF ~ 4,000 hr<sup>-1</sup> at 260 ⁰C. </p><p>More importantly, we find that diluting 0.05 wt% Pd/titania sample with titania to ultra-low 0.005 wt% palladium loading produces a remarkably active material for nitric oxide reduction with carbon monoxide under industrially relevant conditions with >90% conversion of nitric oxide at 180 ⁰C (~460 ppm NO and 150 L/g*hr flow rate in the presence of >2% water steam) and TOF ~6,000 hr<sup>-1</sup>. Pd thus outperforms state-of-the-art rhodium containing catalysts with (15-20 times higher rhodium loading; rhodium is ~ 3 times more expensive than palladium). Furthermore, palladium catalysts are more selective towards nitrogen and produce significantly less ammonia relative to the more traditional rhodium catalysts due to lower Pd amount nd lower water-gas-shift activity. Our study is the first example of utilizing ultra-low (0.05 wt% and less) noble metal (Pd) amounts to produce heterogeneous catalysts with extraordinary activity for nitric oxide reduction. This opens up a pathway to study other Pd, Pt and Rh containing materials with ultra-low loadings of expensive noble metals dispersed on titania or titania-coated oxides for industrially relevant nitric oxide abatement.</p>

Ecological aspects of electrolytic hydrogen: comparing renewable and non-renewable sources

2018 ◽  
Author(s):  
Luigi Viola ◽  
Regina Franciélle Silva Paulino ◽  
José Luz Silveira
Keyword(s):  
Renewable Sources ◽  
Electrolytic Hydrogen ◽  
Ecological Aspects

TECHNICAL AND ECOLOGICAL ASPECTS OF SHALE OIL AND POWER COGENERATION

Oil Shale ◽  
2011 ◽  
Vol 28 (1S) ◽  
pp. 101 ◽  
Author(s):  
A OTS ◽  
A POOBUS ◽  
T LAUSMAA
Keyword(s):  
Shale Oil ◽  
Ecological Aspects

Eichen im Aargau – eine besondere Verantwortung für das Fricktal | Oak in the canton of Argovia – a special responsibility for the Fricktal

2003 ◽  
Vol 154 (7) ◽  
pp. 281-288
Author(s):  
Kurt Steck
Keyword(s):  
Simple Model ◽  
Genetic Resources ◽  
Forest Stands ◽  
Site Factor ◽  
Naturally Occurring ◽  
Ecological Aspects ◽  
Endangered Population ◽  
Middle Spotted Woodpecker ◽  
Special Responsibility ◽  
Important Site

A targeted nurturing of oak in the canton of Argovia goes against the natural development of forest stands where the dominant, naturally occurring species is beech. Because of this,afforestation with oak is both work intensive and costly and is therefore concentrated on sites where silvicultural, economical and ecological aspects have been taken into account. With the help of a simple model showing areas where, above all,oak is nurtured, comprehensively mapped forest stands were classed according to competitiveness and correlated to thermal levels, that represent an important site factor for oak. One important aspect surrounding the issue is the preservation of genetic resources and an adequate supply of appropriate seed from chosen autochthonal, indigenous oak stands. In addition,the endangered population of middle spotted woodpecker,which is tied to widespread sites of aged oak-rich deciduous stands, should be fostered. Taking ecological priorities into account a possible area to nurture oak has been demarcated in the Fricktal.

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