1,720,981 research outputs found
Potentialities and limitations of lean de-NOx catalysts in reducing automotive exhaust emissions
No full textExperimental comparison between external and internal humidification in proton exchange membrane fuel cells for road vehicles
No full textXanthan and κ-carrageenan based alkaline hydrogels as electrolytes for Al/air batteries
No full textXanthan and κ-carrageenan were used to prepare alkaline hydrogels to be used as electrolytes in aluminium air primary batteries. Two pasty gels were obtained starting from xanthan and KOH solutions (1 M and 8 M), while only the 8 M KOH solution permitted the formation of a stable, elastic and gumminess hydrogel with κ-carrageenan. Discharge tests, performed on three Al/air cells assembled with Al anodes, electrolyte gels and Pt based cathodes, evidenced that all hydrogels exhibited appreciable properties of Al ion conductivities, according to the following performance order: xanthan with KOH 1 M < xanthan with KOH 8 M < κ-carrageenan KOH 8 M. Characterization measurements (XRD, Ionic conductivity by EIS, SEM-EDS) were effected on hydrogels and galvanic cells to explain the behaviour differences detected between the hydrogels
Hydrocarbon adsorbers for reducing cold start emissions
No full textSAE Technical Paper Series No. 2000-01-3094 (9 pp.
Investigation of Co-based DeNOx catalysts for the treatment of natural gas lean-burn engine exhaust.
No full textEnhanced activity of bimetallic Fe-Cu catalysts supported on ceria toward water gas shift reaction: synergistic effect
No full textWithin the “hydrogen chain”, the hight-emperature water gas shift reaction represents a key step to improve the H2 yield and adjust the H2/CO x ratio to fit the constraints of downstream processes. Despite the commercial application of the high-temperature water gas shift, novel catalysts characterized by higher intrinsic activity (especially at low temperatures), good thermal stability, and no chromium content are needed. In this work, we propose bimetallic iron-copper catalysts supported on ceria, characterized by low active phase content (iron oxide + copper oxide < 5 wt %). Fresh and used samples were characterized by inductively coupled plasma mass spectrometry, X-ray diffraction, nitrogen physisorption, scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy, and temperature programmed reduction in hydrogen to relate physicochemical features and catalytic activity. The sample with iron/copper ≈ 1 and 4 wt % active phase content showed the best catalytic properties in terms of turnover frequency, no methane formation, and stability. Its unique properties were due to both strong iron-copper interaction and strong metal-support interaction, leading to outstanding redox behavior.[Figure not available: see fulltext.]
Carbon dioxide capture by adsorption on amine incorporated hexagonal mesoporous silica
No full textPost combustion carbon capture technologies could benefit by the utilization of cost-effective solid sorbents. Amine incorporated hexagonal mesoporous silica (HMS) materials have been recently proposed in order to overcome the limitations of the commercial liquid phase amine-based adsorption. In this paper the properties of as-synthesized HMS were studied in order to verify the effectiveness of the templating amine and establish a strategy for the optimization of this contribution
- …
