نتایج جستجو برای: deactivation modeling

تعداد نتایج: 396048  

Journal: :علوم دامی ایران 0
حامد خلیل وند بهروزیار دانشجوی دکتری پردیس کشاورزی و منابع طبیعی دانشگاه تهران مهدی دهقان بنادکی استادیار پردیس کشاورزی و منابع طبیعی دانشگاه تهران کامران رضایزدی دانشیار پردیس کشاورزی و منابع طبیعی دانشگاه تهران

effects of condensed tannins (ct) on crude protein availability in sainfoin hay was investigated according to most popular ruminant feeding systems. different treatments including polyethylene glycol (6000 mw), sodium hydroxide, sodium bicarbonate, potassium permanganate, wood ash, water and urea, were applied for deactivation of ct crude protein fractioning was determined using nylon bag techn...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2011
mariane trépanier ahmad tavasoli sanaz anahid ajay k. dalai

the effects of electronic properties of inner and outer surfaces of carbon nano tubes (cnts) on the deactivation of cobalt fischer-tropsch (ft) catalysts were studied. the comparative characterization of the fresh and used catalysts by tem, xrd, tpr, bet and h2 chemisorption showed that cobalt re-oxidation, cobalt-support interactions and sintering are the main sources of catalyst deactivation....

In the present study, tin-promoted Pd/MWNTs nanocatalystwas synthesized via polyol technique for application in hydrogenation of high-concentrated acetylene feedstocks. TEM images showed a restricted distribution of nanoparticles in the range of 3-5 nm. The results indicated that nanoparticles sizes were resistant to further catalyst deactivation. XRD patterns signified alloying between Pd and ...

2014
Giuseppe Trunfio

The deactivation pattern of a “model” Ni/MgO catalyst in the pre-reforming of n-hexane with steam (T, 450 °C; P, 5–15 bar) is reviewed. The influence of the steam-to-carbon ratio (S/C, 1.5–3.5) on the rate of catalyst fouling by coking is ascertained. Catalyst fouling leads to an exponential decay in activity, denoting 1-order dependence of the coking process on active sites availability. Hydro...

2017
Gary Peng Rene Barro-Soria Kevin J. Sampson H. Peter Larsson Robert S. Kass

KCNQ1 is a voltage-gated potassium channel that is modulated by the beta-subunit KCNE1 to generate IKs, the slow delayed rectifier current, which plays a critical role in repolarizing the cardiac action potential. Two KCNQ1 gain-of-function mutations that cause a genetic form of atrial fibrillation, S140G and V141M, drastically slow IKs deactivation. However, the underlying gating alterations r...

Ahmad Tavasoli, Ajay K. Dalai Mariane Trépanier Sanaz Anahid

The effects of electronic properties of inner and outer surfaces of Carbon Nano Tubes (CNTs) on the deactivation of cobalt Fischer-Tropsch (FT) catalysts were studied. The comparative characterization of the fresh and used catalysts by TEM, XRD, TPR, BET and H2 chemisorption showed that cobalt re-oxidation, cobalt-support interactions and sintering are the main sources o...

A. Moghadassi, M. Bahmani N. Amini O. Fadavi

A kinetic model of a fixed bed tubular reactor incorporating catalyst deactivation was developed for the ISOMAX unit of Arak refinery. The kinetic parameters for the hydrocracking reactions over the commercial catalyst were determined using initial activity plant data i.e. when the catalyst is fresh. Catalyst deactivation was then taken into account by means of deactivation function based on pl...

Journal: :Applied Catalysis B-environmental 2021

The deactivation of copper electrodes is a serious problem that can affect the scalability and deployment CO2 electrolyzers. effect generally attributed to cathodic deposition Fe Zn impurities from electrolyte. Herein, an experimental-theoretical study shows existence potential- facet-dependent pathways for reduction CH4 on Cu. small-overpotential pathway deactivates electrodes, while large-ove...

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