Reaction pathways and kinetics for hydrogen production by oilfield wastewater gasification in supercritical water

Peng, Z.K.; Rong, Siqi; Xu, Jialing; Jin, Hui; Zhang, Jiawei; Shang, Fei

doi:10.1016/j.fuel.2022.123135

Cited by 30 publications

(7 citation statements)

References 57 publications

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“…Peng et al produced hydrogen from oilfield effluent using gasification of supercritical water in a continuous system (Peng Z et al, 2023). The thermodynamic investigation demonstrated that supercritical water (SCW) can gasify oilfield wastewater effectively due to coke inhibition.…”

Section: Hho Gas Production Methodsmentioning

confidence: 99%

Bibliometric Analysis of HHO Gas Production by Electrolysis from 2013 to 2023

Purwono,

Hadiyanto,

Arief Budihardjo

et al. 2023

J. Presipitasi

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HHO gas is one promising alternative as an alternative for fossil fuels, nevertheless, several challenges need to be overcome in order for HHO gas to become a viable option for global use. This paper presentsbibliometric analysis, HHO gases production methods, and challenges of using HHO gas. The primary objective of this review paper is to provide views, assessments, and evaluations of the published literature on HHO gas, both the production and use challenges of HHO gas. This review article uses several software programs including origin for graph visualization, Microsoft excel for processing data, and VOSviewer for analyzing bibliographic mappings. HHO production can be done by adding KOH electrolyte solution. Factors that affect the production of HHO gas include electrolyte properties, electrolyte concentration, and distance between electrodes. An increase in the concentration of the electrolysis solution leads to an increase in the production of HHO gas. The production of HHO gas can also be done with the addition of Na2CO3 or K2CO3 which can produce high H2 gas. The pre-combustion mercury removal technique using coal electrolysis produces hydrogen byproducts with 50% less energy than water electrolysis. A single Pt circuit at TiO2 support (Pt1/def-TiO2) forms a highly efficient photocatalyst for hydrogen production. The main challenges of HHO gas in terms of production, storage, distribution, safety, cost of HHO gas production.

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Section: Hho Gas Production Methodsmentioning

confidence: 99%

Bibliometric Analysis of HHO Gas Production by Electrolysis from 2013 to 2023

Purwono,

Hadiyanto,

Arief Budihardjo

et al. 2023

J. Presipitasi

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“…It was proven that plastics could be gasified in supercritical water and the gas products were made up of CO 2 and flammable gas, such as H 2 , CH 4 , and CO. − As a result, products in gas phase after the gasification consisted of H 2 , CH 4 , CO, CO 2 , and H 2 O. And the physical energy and chemical energy of these products could be recycled and stored in the form of electricity, heat, and fuel gas.…”

Section: Methodsmentioning

confidence: 99%

Heat, Electricity, and Fuel Gas Ploy-Generation System on an Island based on Plastic Waste Gasification in Supercritical Water

Wang

Huo

et al. 2022

ACS Sustainable Chem. Eng.

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Plastic pollution in the ocean has become a serious threat to the health of marine life and even terrestrial life. It is also a challenge to transport it landside for recycling. A system to recycle the plastics in situ on an island was proposed with the aim to convert the plastics to fuel gases, such as H2, CH4, and CO. As one of the most abundant thermoset plastics in the ocean, epoxy plastics were recycled in this system. They were gasified in supercritical water driven by concentrated solar energy. A heat exchanger and turbine were used for electricity. The fuel gas could be stored in the gas tank at 4 MPa. The energy and exergy efficiency in this system were analyzed, and the effects of temperature, pressure, and feedstock concentration were discussed. The typical conditions were as follows: temperature 600 °C; pressure 25 MPa, and feedstock concentration 5 wt %. The mole fractions of these products were 48.13%, 22.97%, 0.84%, and 28.06%, respectively. Additionally, the energy and exergy efficiency were 51.75% and 45.22%, respectively.

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“…The steam-reforming reaction, water-gas shift reaction, and methanation reaction during the SCWG of organics are accepted by researchers [39][40][41] as the main reactions, as shown in Equations ( 11)- (13). Gas molar fraction (14) and gas yield (15) Gas molar fraction = the mole of gaseous product the molar number of all the gaseous × 100%…”

Section: Effects Of Operating Conditions On Scwg Of Rice Strawmentioning

confidence: 99%

“…Supercritical water has a low viscosity and dielectric constant, and its solubility tends to be similar to that of organic solvents while its diffusion coefficient tends to be similar to that of gases [ 13 , 14 ]. The ability of supercritical water to be miscible with organics and gases in any ratio allows reactions to be conducted under homogeneous conditions, greatly facilitating reaction rates [ 15 , 16 ]. Supercritical water gasification biomass technology converts biomass into a highly concentrated hydrogen-rich gas mixture at lower temperatures and reducing conditions, and also avoids the generation of pollutants such as nitrogen compounds, sulfides, and suspended particles during combustion and conventional gasification processes [ 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Model for Hydrogen Production from Rice Straw Supercritical Water Gasification

Liu,

Peng,

et al. 2024

Materials

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Supercritical water gasification (SCWG) technology is highly promising for its ability to cleanly and efficiently convert biomass to hydrogen. This paper developed a model for the gasification of rice straw in supercritical water (SCW) to predict the direction and limit of the reaction based on the Gibbs free energy minimization principle. The equilibrium distribution of rice straw gasification products was analyzed under a wide range of parameters including temperatures of 400–1200 °C, pressures of 20–50 MPa, and rice straw concentrations of 5–40 wt%. Coke may not be produced due to the excellent properties of supercritical water under thermodynamic constraints. Higher temperatures, lower pressures, and biomass concentrations facilitated the movement of the chemical equilibrium towards hydrogen production. The hydrogen yield was 47.17 mol/kg at a temperature of 650 °C, a pressure of 25 MPa, and a rice straw concentration of 5 wt%. Meanwhile, there is an absorptive process in the rice straw SCWG process for high-calorific value hydrogen production. Energy self-sufficiency of the SCWG process can be maintained by adding small amounts of oxygen (ER < 0.2). This work would be of great value in guiding rice straw SCWG experiments.

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Reaction pathways and kinetics for hydrogen production by oilfield wastewater gasification in supercritical water

Cited by 30 publications

References 57 publications

Bibliometric Analysis of HHO Gas Production by Electrolysis from 2013 to 2023

Bibliometric Analysis of HHO Gas Production by Electrolysis from 2013 to 2023

Heat, Electricity, and Fuel Gas Ploy-Generation System on an Island based on Plastic Waste Gasification in Supercritical Water

Thermodynamic Model for Hydrogen Production from Rice Straw Supercritical Water Gasification

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