A energia do hidrogênio

Miranda, Paulo Emílio V. de

doi:10.1590/s1517-70762012000100001

Cited by 3 publications

(4 citation statements)

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“…[2,23,24] Comparing the results of table 4 with the results obtained in the present work, it can be seen that the production of biohydrogen by the method presented here, had its production in% v / v ranging from 36-94%, its greatest advantages are in the reuse of carbohydrate-rich agro-industry residues such as glucose, the raw material of the fermentation process and the use of a new hydrogen production technology involving the use of carbon nanotubes that have been shown to be efficient as a working electrode in hydrogen electrosynthesis. As a disadvantage one can mention the high cost of the electrolysis process, according to Levene [21] and Miranda [25].…”

Section: Comparison Of Biohydrogen Production Processesmentioning

confidence: 99%

Utilization of carbon nanotubes in hydrogen electrosynthesis from tropical fruit fermentation

Lopes¹,

Abreu²

2020

Matéria (Rio J.)

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The use of fossil fuels, especially oil and gas, has accelerated in recent years, resulting in the global energy crisis. The fermentative biological process is a sustainable way to produce hydrogen, as it can use as a substrate various types of carbohydrate-rich industrial and household waste such as fruit, minimizing but not completely eliminating the problems caused by improper disposal of this material. From a perspective of energy conservation and use of renewable sources for energy generation, this work aims to contribute to the identification of the use of a currently unused portion of energy, optimizing hydrogen production from a fuel cell. microbial. The main nanomaterial used in electrolysis was carbon nanotubes (CNT) incorporated into carbon felt (CF). Cyclic voltammetry studies were also performed on three electrode systems: vitreous carbon electrode as working electrode, platinum electrode as auxiliary electrode and Ag / AgCl / Cl- as reference electrode. An electrochemical cell formed by two separate compartments was constructed. Before starting the electrolysis experiment, an experimental design was performed using the complete factorial design technique to analyze the influence of the variables selected for this study. The independent variables selected were: Tropical fruit liquor concentration in %v/v, type of working electrode, electrolysis time and pH of the electrolyte medium. The observed variable was the concentration in% v / v of the hydrogen gas obtained in the electrolysis. After the results of the tests, it was concluded that carbon nanotubes can be used as working electrode, presenting success in the hydrogen production process and that the pH of the electrolytic medium has a strong influence on this process. The present work was concluded presenting an alternative way in the production of a renewable energy source.

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Section: Comparison Of Biohydrogen Production Processesmentioning

confidence: 99%

Utilization of carbon nanotubes in hydrogen electrosynthesis from tropical fruit fermentation

Lopes¹,

Abreu²

2020

Matéria (Rio J.)

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“…Hydrogen is a pure and non-polluting element, can be applied in many sectors of the industry, among them, electric power generation, raw materials to heat generation, are also used in the chemical, petrochemical, steel companies and food sectors. There are several ways to obtain hydrogen through electrolysis, solar panels, wind energy and biomass generation [14].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen generator, an application with internal combustion engines

Campos¹,

Pinto²,

Alves³

2019

IJAERS

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This Paper present the steps to build an hydrogen cell emphasizing the need to use as a renewable energy source, being applied with internal combustion engines, as an efficient result obtained through electrolysis. Data presented in tables and graphs were collected and analyzed, both for urban streets and for highways. The tests in urban streets the vehicle presented 15.5 kilometers per liter of fuel (km/l), with efficiency of 38% compared to ordinary fuel, as well as on highways, made 18.9 km/l, with 33%, respectively acting at 60.5 kilometers per hour (km/h), the gain is due the fact that the system, which is directly linked to the generator currents and voltages consumption, implying that the higher current consumption, greater will be the gas generation. The results of the project show the veracity of achieving economy, yield and efficiency through hydrogen, allowing the possibility of implementation not only in vehicles but, in all varieties of engines available on the market today, and the substitution for other sources.

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“…Nowadays, one of the most important environmental issues is to replace finite, polluting fossil fuels with sustainable fuels [1,2]. In this context, hydrogen (H 2 ) is an alternative fuel to the traditional ones: H 2 combustion produces water only, and this fuel has three times higher energy potential than gasoline (142 kJ.g -1 ) [1,3,4,5]. However, physical-chemical methods, which also depend on fossil fuels or require a large amount of energy, are mainly employed to obtain H 2 [4].…”

Section: Introductionmentioning

confidence: 99%

“…However, physical-chemical methods, which also depend on fossil fuels or require a large amount of energy, are mainly employed to obtain H 2 [4]. Alternatively, biological routes, such as fermentation, can be used to obtain H 2 [1,3]. The fermentative route is promising in terms of cost and sustainability because it employs renewable raw materials, including carbohydrate-rich biomasses, at ambient temperature and pressure [6,7].…”

Section: Introductionmentioning

confidence: 99%

Enzymatically and/or thermally treated Macroalgae biomass as feedstock for fermentative H2 production

et al. 2019

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Due to its high carbohydrate content, algae biomass can be employed as feedstock to produce hydrogen (H2) by fermentation. However, to make the carbohydrates entrapped within the cell wall more bioavailable, algae biomass must be treated before fermentation. We submitted Kappaphyccus alvarezzi macroalgae biomass to autoclave (at 120 °C and 1 atm for 6 h) treatment and/or enzymatic (Celluclast® and/or a recombinant βglucosidase) hydrolysis, to break down complex carbohydrates into available sugars that were used to produce H2 by fermentation. Macroalgae biomass treated with Celluclast®+β-glucosidase and with combined thermal treatment and enzymatic hydrolysis reached very similar TRS productivities, 0.24 and 0.22 g of TRS/L.h, respectively. The enzymatically treated biomass was employed as feedstock to produce H2 by Clostridium beijerinckii Br21, which afforded high yield: 21.3 mmol of H2/g of dry algae biomass. Hence, treatment with Celluclast® and recombinant β-glucosidase provided macroalgae biomass for enhanced bioconversion to H2 by C. beijerinckii Br21.

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A energia do hidrogênio

Cited by 3 publications

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Utilization of carbon nanotubes in hydrogen electrosynthesis from tropical fruit fermentation

Utilization of carbon nanotubes in hydrogen electrosynthesis from tropical fruit fermentation

Hydrogen generator, an application with internal combustion engines

Enzymatically and/or thermally treated Macroalgae biomass as feedstock for fermentative H2 production

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