catalytic activity


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catalytic activity

[¦kad·əl¦id·ik ak′tiv·əd·ē]
(chemical engineering)
The ratio of the space velocity of a catalyst being tested, to the space velocity required for a standard catalyst to give the same conversion as the catalyst under test.
References in periodicals archive ?
In addition to this wide array of functions, antibodies under certain conditions also exhibit an enzymatic or catalytic activity and are called "abzymes" (antibody enzymes).
These low-coordinated active atoms and contiguous oxygen ions may play the role of heterojunctions that synergistically facilitate the Volmer process and thus render stimulated HER catalytic activity, corresponding to a faster electron transfer and more facile HER kinetics at the electrode/electrolyte interface.
Catalytic Activity. The catalytic performance of the bifunctional catalyst was investigated by hydrotreating Jatropha curcas seed oil in a continuous flow tubular reactor of 9 mm internal diameter and 300 mm in length vertically within the tubular programmable temperature.
Catalytic Activity. Esterification of acetic acid with 1-heptanol was performed using a three-neck flask under atmospheric pressure at 90[degrees]C.
Compared with N/S/F-CNTs, the other two catalysts exhibited evidently worse catalytic activity. The value of electron transfer number for N/S/F-CNTs was close to 4.0, which was calculated from Koutecky-Levich curves with a potential range of -0.4 V to -0.50 V [25-27].
Compared with [Fe.sub3][O.sub.4], [Co.sub3][O.sub.4] microspheres, [V.sub6][O.sub.13] nanobelts, and [alpha]-[Fe.sub.2][O.sub.3]/C, the [M.sub.2][O.sub.3]/CNTs showed better catalytic activity in the thermal decomposition of AP.
It appears that particle size and the mechanism of reaction including the base employed, influences on the catalytic activity. A higher particle size favors the oxidation at intermediates, and distinct mechanisms of reaction with NaOH or CaC[O.sub.3] are followed.
Previous research found that the catalytic activity increases as the while line intensity decreases [17].
The effect of variation EDA concentration on the catalytic activity was investigated (Figure 1).
Those carbonaceous materials that have a high specific surface area show higher catalytic activity [7].
On the other hand, ionic compounds are constituted in an ion-pair configuration, where the cationic species (commonly anilinium or carbonium) takes the function of activating the alkylated active sites, while the anionic species (tetra(pentafluorophenyl)borate) prevent the interaction between the abstracted methyl and the Zr center (1), therefore the catalytic activity is better.
The types of stabilizers and concentration, the solvent polarity [10], and the aging time of colloidal suspensions [11] can have an effect on the size, shape and catalytic activity of palladium nanoparticles.