Author
Leonila C. Abella
Other affiliations: University College of Engineering
Bio: Leonila C. Abella is an academic researcher from De La Salle University. The author has contributed to research in topics: Catalysis & Steam reforming. The author has an hindex of 7, co-authored 27 publications receiving 142 citations. Previous affiliations of Leonila C. Abella include University College of Engineering.
Papers
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TL;DR: In this paper, the effect of Ni loading on the catalytic activity of Ni/ZrO2 catalyst for methane steam reforming was investigated and the sample containing 15 wt.% Ni exhibited the highest activity as well as stability at 600°C.
Abstract: The effect of Ni loading on the catalytic activity of Ni/ZrO2 catalyst for methane steam reforming was investigated. The sample containing 15 wt.% Ni exhibited the highest activity as well as stability at 600°C.
23 citations
TL;DR: In this article, the reaction rate in the vapor phase was measured in a fixed-bed reactor filled with Ru-Pd/C catalyst which had high selectivity and activity for dehydrogenation.
Abstract: The system of 2-propanol-acetone-hydrogen can be effectively utilized as a chemical heat pump cycle. This research focuses on an important part of the cycle, specifically the liquid-phase dehydrogenation of 2-propanol to produce acetone and hydrogen at low temperatures under boiling conditions. As preliminary experiments, the reaction rate in the vapor phase was measured in a fixed-bed reactor filled with Ru-Pd/C catalyst which had high selectivity and activity for dehydrogenation. The conversion was limited by the equilibrium (0.108 at 90°C). Next, since the product acetone is known to be a strong inhibitor in the dehydrogenation, a reactive distillation column was used to separate acetone from the reaction field. Acetone (b.p. 56.3°C) is vaporized as the top product ahead of 2-propanol (b.p. 82.4°C). The hydrogen produced remains in the gas phase throughout the operation. The use of reactive distillation, which is a pioneering idea for this chemical heat pump, can facilitate complete conversion of the dehydrogenation. Pure acetone can be obtained for the specified conditions (less than 0.04 mmol/s of feed flow rate). The conversion was greatly affected by the feed flow rate, the temperature of the heat source, and the reflux ratio. The reaction rate is independent of the mole fraction of acetone in the feed. The proposed reactive distillation may be promising for a chemical heat pump.
20 citations
TL;DR: In this article, the authors focused on the removal of arsenic from simulated groundwater by batch adsorption using iron-modified rice husk carbon (RH-Fe) and showed that RH-Fe was very effective in removing arsenic not only at low and moderate initial concentrations of arsenic (1.42 and 2.77 mg/L) but also at very high initial concentrations (4.61 and 7.38mg/L).
Abstract: This study focused on the removal of arsenic from simulated groundwater by batch adsorption using iron-modified rice husk carbon (RH-Fe). The results showed that RH-Fe was very effective in the removal of arsenic not only at low and moderate initial concentrations of arsenic (1.42 and 2.77 mg/L) but also at very high initial concentrations of arsenic (4.61 and 7.38 mg/L). The arsenic adsorption by RH-Fe was dependent on pH and varied with arsenic initial concentration and adsorbent dose. Langmuir isotherm could describe the adsorption equilibrium and the adsorption capacity was found to be 2.24mg/g. The pseudo-second order kinetic model gave the best fit with the experimental data.
16 citations
TL;DR: In this article, the liquid-phase dehydration of tert-butyl alcohol to produce isobutene and water below 373 K was performed in a reactive distillation column with a catalyst-bed filled with Amberlyst 15 for various reduced pressures and feed flow rates.
Abstract: A system of tert-butyl alcohol can be effectively provided for a chemical heat pump cycle to upgrade low-temperature waste heat energy. This study focuses on an important part of the cycle, an endothermic reaction, specifically the liquid-phase dehydration of tert-butyl alcohol to produce isobutene and water below 373 K.Dehydration is carried out in a reactive distillation column with a catalyst-bed filled with Amberlyst 15 for various reduced pressures and feed flowrates. The use of reactive distillation facilitates complete conversion of the dehydration of tert-butyl alcohol by avoiding strong inhibition of water in this reaction.Experimental results are compared with the results simulated by using an ASPEN PLUS Process Simulator.
14 citations
TL;DR: In this article, a rate equation that considered the inhibition of water was formulated and experiments were carried out both in a semi-batch reactor and in a continuous stirred tank reactor (CSTR) with wet or dry resins.
Abstract: The dehydration of tert-butyl alcohol (TBA) in the liquid phase was studied by using an ion exchange resin, Amberlyst 15 (A15) in the H+ form. Experiments were carried out both in a semi-batch reactor and in a continuous stirred tank reactor (CSTR) with wet or dry resins. The results with the dry resin in the semi-batch reactor were different from those with the wet resin due to the swelling of resin in the presence of water. However, the results in CSTR agreed well with those in the semi-batch reactor using the wet resin. A rate equation that considered the inhibition of water was formulated. The experimental results agreed well with the calculated ones. © 1999 John Wiley & Sons, Inc. Int J Chem Kinet 31: 854–859, 1999
13 citations
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TL;DR: The design and operation issues for reactive distillation systems are considerably more complex than those involved for either conventional reactors or conventional distillation columns as discussed by the authors, and the introduction of an in situ separation function within the reaction zone leads to complex interactions between vapor-liquid equilibrium, vapor−liquid mass transfer, intra-catalyst diffusion, and chemical kinetics.
693 citations
TL;DR: A review of literature and studies on the biodegradation of PCBs is presented in this article, where the degradation route is dependent on the complexity of the PCB congener coupled with the type of microorganism employed and the interaction among the microorganisms.
458 citations
TL;DR: In this article, a review aims to introduce these hydrogen production processes, to present developments in these areas, and discusses recent improvements that have made noteworthy impacts, including increasing the stability of the catalysts, overall conversion of raw materials, and the hydrogen production selectivity.
446 citations
TL;DR: In this paper, an active catalyst which can provide high reforming reaction rates at low temperature was proposed for low-temperature MSR with coke resistant catalysts, which is the state-of-the-art in the world.
248 citations
TL;DR: In this paper, a short overview on catalysts utilization as well as on the fundamentals of membrane reactors is given, and a summary of the relevant advancements in this field is also presented, along with the recent progress on the methane steam reforming reaction, which is the most common industrial process used for almost 50% of the world's hydrogen production.
Abstract: Methane steam reforming is the most common industrial process used for almost the 50% of the world’s hydrogen production. Commonly, this reaction is performed in fixed bed reactors and several stages are needed for separating hydrogen with the desired purity. The membrane reactors represent a valid alternative to the fixed bed reactors, by combining the reforming reaction for producing hydrogen and its separation in only one stage. This article deals with the recent progress on methane steam reforming reaction, giving a short overview on catalysts utilization as well as on the fundamentals of membrane reactors, also summarizing the relevant advancements in this field.
246 citations