Showing papers by "Francisco Rodríguez-Reinoso published in 1984"
TL;DR: In this paper, the porosity evolution of two series of samples prepared by the reaction of two activated carbons (from almond shells and olive stones) with air at 350°C has been followed by adsorption of CO2 (273 and 298 K) and n-butane (273 K).
48 citations
TL;DR: Several series of activated carbons have been prepared from almond shells by carbonization in nitrogen followed by activation in a flow of carbon dioxide, and the effect of preparation conditions on the adsorptive capacity of the carbons are also discussed as mentioned in this paper.
48 citations
TL;DR: In this paper, the results obtained in the hydrogenation of CO indicate that in the case of Fe catalysts the highest selectivity toward hydrocarbons was given by the catalyst supported on V3G, with large metal particle size.
41 citations
TL;DR: Olive stones and almond shells have been used as raw materials to prepare activated carbons following three different experimental methods: (a) carbonization in N2 followed by activation in CO2, (b) direct activation of CO2 and (c) treatment in dry air at 573 K followed by activating in CO 2 as mentioned in this paper.
Abstract: Olive stones and almond shells have been used as raw materials to prepare activated carbons following three different experimental methods: (a) carbonization in N2 followed by activation in CO2, (b) direct activation in CO2 and (c) treatment in dry air at 573 K followed by activation in CO2. The carbons have been characterized by the adsorption of paranitrophenol, methylene blue, orange II, crystal violet and victoria blue, all in aqueous solution. Methods (a) and (b) yield carbons with very similar adsorptive capacities and carbons prepared by method (c) have larger adsorptive capacities for similar overall yields. On the other hand, carbons from almond shells (more microporous) would be more suitable for adsorption of small solutes and carbons from olive stones (more macroporous and consequently, with larger rate of adsorption) for larger dimension molecules.
33 citations
TL;DR: In this article, three different methods for the preparation of activated carbons from almond shells and olive stones have been carried out in the temperature range 1073-1123 K: (a) carbonization in N2 followed by...
Abstract: Three different methods for the preparation of activated carbons from almond shells and olive stones have been carried out in the temperature range 1073–1123 K: (a) carbonization in N2 followed by ...
18 citations
TL;DR: In this article, the adsorption of several hydrocarbons (benzene, cyclohexane, n-butane and n-hexane) on a series of carbons resulting from the reaction of an activated carbon prepared from almond shells with air at 623 K is discussed.
Abstract: The adsorption of several hydrocarbons (benzene, cyclohexane, n-butane, n-hexane, 2,2-dimethylbutane and isooctane) on a series of carbons resulting from the reaction of an activated carbon prepared from almond shells with air at 623 K is discussed. The results are parallel to those obtained with N2 at 77 K (González-Vilchez et al. 1979) but very different to those of CO2 at 273 and 298 K (Rodríguez-Reinoso et al. 1984). A comparison of three different ways of expressing the adsorption data is used to discuss the possible molecular sieving effect of the carbons towards the hydrocarbons.
13 citations
TL;DR: In this article, the evolution of microporosity of activated carbons prepared from carbonized olive stones as a function of burn-off in carbon dioxide (activating agent) has been studied at high temperature using a gas chromatographic technique.
Abstract: The evolution of microporosity of activated carbons prepared from carbonized olive stones as a function of burn-off in carbon dioxide (activating agent) has been studied at high temperature using a gas chromatographic technique. The specific net retention volumes have been used to determine the possible molecular sieve properties of the carbons towards several hydra-carbons. This molecular sieving is thought to be due to the existence of slit-shaped pores in the carbons with well-defined dimensions. The retention data have also been used to calculate the heats of adsorption and their dependence on the porosity of the carbons.
12 citations
TL;DR: The adsorption-desorption isotherms of N2 at 77 K and hydrocarbons (benzene, cyclohexane, 2,2-dimethylbutane, n-hexane and iso-octane) at 298 K have been determined on a series of carbons prepared in this article.
Abstract: The adsorption-desorption isotherms of N2 at 77 K and hydrocarbons (benzene, cyclohexane, 2,2-dimethylbutane, n-hexane and iso-octane) at 298 K have been determined on a series of carbons prepared ...
10 citations
TL;DR: In this paper, the microporosity of two series of activated carbons (prepared from olive stones and almond shells) reacted with air at 623 K to different degrees of burn-off.
Abstract: The n-nonane preadsorption method has been applied to evaluate the microporosity of two series of activated carbons (prepared from olive stones and almond shells) reacted with air at 623 K to different degrees of burn-off. A detailed study of the experimental conditions needed for the successive removal of the n-nonane preadsorbed has been carried out, showing that the sample outgassed at 673 K is identical to the original. In general, the results obtained with the preadsorption of n-nonane are satisfactory only in carbons with a narrow microporosity. On the other hand, this method has been used to calculate the apparent surface area of the carbons from the n-nonane retained using an Am value of 0.844 nm2, the results being in good agreement with the N2 BET values. An analysis of the evolution with burn-off of the parameters C(BET) and D(DR) has also been carried out and their relationship calculated; both parameters describe reasonably well the evolution of the microporosity of the carbons.
7 citations
1 citations