Showing papers in "Energy & Fuels in 2019"
TL;DR: In this paper, the enforcement of a CO2 tax, stringent regulations, and investment in renewables are some of the mitigation strategies currently in place for reducing CO2 emissions in the world.
Abstract: Reducing CO2 emissions is an urgent global priority. The enforcement of a CO2 tax, stringent regulations, and investment in renewables are some of the mitigation strategies currently in place. For ...
262 citations
TL;DR: In this paper, fast pyrolysis of lignocellulosic materials is one of the most complex and inexpensive raw oils that can be produced today, although commercial or demonstration scale fast pyrol...
Abstract: Bio-oil derived from fast pyrolysis of lignocellulosic materials is among the most complex and inexpensive raw oils that can be produced today. Although commercial or demonstration scale fast pyrol...
197 citations
TL;DR: In this paper, the authors discuss the role of fossil fuels in an increasing generation of pollutants; many of these harmful products have been of serious environmental concern, and the authors propose a solution to the problem.
Abstract: Proliferating energy consumption, particularly of fossil fuels, has led to an increasing generation of pollutants; many of these harmful products have been of serious environmental concern. While e...
179 citations
TL;DR: The electrochemical upgrading of bio-oil is a potential renewable approach toward generating liquid biofuels or industrial chemicals under mild reaction conditions (≤80 °C and ambient pressure) as mentioned in this paper.
Abstract: The electrochemical upgrading of bio-oil is a potential renewable approach toward generating liquid biofuels or industrial chemicals under mild reaction conditions (≤80 °C and ambient pressure). Th...
139 citations
TL;DR: In this article, N-doped porous carbons were synthesized by a one-step sodium amide activation of carbonized lotus leaf at 450-500 °C.
Abstract: In this work, N-doped porous carbons were synthesized by a one-step sodium amide activation of carbonized lotus leaf at 450–500 °C. The CO2 adsorption properties of the as-synthesized carbonaceous ...
86 citations
TL;DR: In this paper, a low-salinity aqueous formulations have shown promising results for rock wettability modification and interfacial tension reduction, such as surfactant and nanoparticles.
Abstract: Advanced low-salinity aqueous formulations have shown promising results for rock wettability modification and interfacial tension reduction. Additives, such as surfactant and nanoparticles, can be ...
86 citations
TL;DR: In this paper, nitrogen-doped hierarchical porous biochar was prepared from corn kernels, which has aroused great interest in energy storage and adsorption applications, and it was shown that the biochar can be used in many applications.
Abstract: Nitrogen-doped hierarchical porous biochar has aroused great interest in energy storage and adsorption applications. In this study, nitrogen-doped hierarchical porous biochar was prepared from corn...
74 citations
TL;DR: In this paper, the main target of the research is the development of a novel nanocomposite consisting of copper(II) and titanium oxide nanoparticles and polyacrylamide (PAM) polymer for use as a hybrid agent.
Abstract: The main target of this research is the development of a novel nanocomposite consisting of copper(II) and titanium oxide nanoparticles and polyacrylamide (PAM) polymer for use as a hybrid agent bes...
66 citations
TL;DR: In this article, the authors show that Nanoparticles can improve the stability of CO2 foam and increase oil recovery during CO2 flooding in reservoirs, however, there are few reports in the literature concerning the synergistic effects of nanoparticles.
Abstract: Nanoparticles can improve the stability of CO2 foam and increase oil recovery during CO2 flooding in reservoirs. However, there are few reports in the literature concerning the synergistic effects ...
64 citations
TL;DR: Ni/La2O3-MgAl2O4 has been investigated for dry reforming of methane in a cold plasma dielectric barrier discharge (DBD) fixed-bed reactor.
Abstract: Ni/La2O3-MgAl2O4 has been investigated for dry reforming of methane (DRM) in a cold plasma dielectric barrier discharge (DBD) fixed-bed reactor. Ni/La2O3-MgAl2O4 was prepared according to the modif...
62 citations
TL;DR: Wettability of CO2/brine/clay is one of the most important parameters in assessing CO2 storage capacities and containment security as mentioned in this paper, despite its importance, the literature data in this context are v...
Abstract: Wettability of CO2/brine/clay is one of the most important parameters in assessing CO2 storage capacities and containment security. Despite its importance, the literature data in this context are v...
TL;DR: Using carbon dioxide as a displacing fluid to enhance shale gas recovery is a promising technique given its potential for significant contributions to both unconventional resource development and CCS as discussed by the authors, and it is shown that carbon dioxide can be used to enhance gas recovery.
Abstract: Using carbon dioxide as a displacing fluid to enhance shale gas recovery is a promising technique given its potential for significant contributions to both unconventional resource development and C...
TL;DR: In this paper, a hyper-cross-linked polymers (HCPs) with nanosized pores have attracted a lot of interest in carbon dioxide adsorption and storage.
Abstract: Hyper-cross-linked polymers (HCPs), as one of the variety of microporous polymers with nanosized pores, have attracted a lot of interest in carbon dioxide adsorption and storage. A HCP adsorbent ba...
TL;DR: In this paper, an improved mesoporous nanocomposite CO2 adsorbents IMSiNTs-PEI (IMP) were synthesized by improved pretreatment of natural halloysite nanotubes (HNTs) and impregnation of IMSiNTs with polyethylenimine (PEI).
Abstract: New improved mesoporous nanocomposite CO2 adsorbents IMSiNTs-PEI (IMP) were synthesized by improved pretreatment of natural halloysite nanotubes (HNTs) and impregnation of improved mesoporous silica nanotubes (IMSiNTs) with polyethylenimine (PEI). The new improved mesoporous morphology remained the same as the HNTs morphology, but the specific surface area (340.61 m2/g) and pore volume (0.499 m3/g) after treatment, respectively, were about 7 times and 2.5 times more than those values for HNTs. The results indicate that more active groups were created on the IMSiNTs surface compared with HNTs. Also, an adsorption apparatus was used for analyzing the impact of various ranges of pressure, temperature, and loaded PEI amount on adsorption capacity. The results showed an increase in uptake capacity with increasing pressure and also a decrease in uptake capacity with increasing temperature exhibiting that the nature of the processes is exothermic. On the other hand, the proper PEI dispersion inside the IMSiNTs c...
TL;DR: Refined coal pitch is a recognized precursor to produce high-quality needle coke with its higher aromaticity, lower ash content, and a relatively narrow distribution of molecular weight as discussed by the authors.
Abstract: Refined coal pitch is a recognized precursor to produce high-quality needle coke with its higher aromaticity, lower ash content, and a relatively narrow distribution of molecular weight. The aromat...
TL;DR: The wettability of shale is a key parameter which determines pore and reservoir-scale fluid distributions, CH4 reserves estimation, and ultimate recovery efficiency from shale gas reserves as mentioned in this paper.
Abstract: Methane (CH4) wettability of shale is a key parameter which determines pore and reservoir-scale fluid distributions, CH4 reserves estimation, and ultimate recovery efficiency from shale gas reservo...
TL;DR: In this paper, the pore structure of the Permian shales of Barakar formation in India was investigated to understand their potential for natural gas production and possible CO2 sequestration.
Abstract: Permian shales of Barakar formation in India were investigated to study their pore structure to understand their potential for natural gas production and possible CO2 sequestration. The studied sha...
TL;DR: In this article, heavy vacuum residue (VR) has been used to meet the increasing demand of high-value transportation fuels, such as gasoline and diesel fuel, in the US.
Abstract: Unconventional feedstocks, such as heavy vacuum residue (VR), have become potential candidates that could be positively exploited to meet the increasing demand of high-value transportation fuels, i...
TL;DR: The ultimate recovery of these reserves is very low because of higher wettability of the carbonate rock relative to cr... as discussed by the authors, which is a significant amount of oil and gas reserves.
Abstract: Carbonate reservoirs contain a significant amount of oil and gas reserves, but the ultimate recovery of these reserves is very low because of higher wettability of the carbonate rock relative to cr...
TL;DR: There is increasing interest in developing biobased alternative jet fuels to meet rising aviation demand and address environmental concerns as mentioned in this paper. But uncertainty of oil prices, issues of energy security, an...
Abstract: There is increasing interest in developing biobased alternative jet fuels to meet rising aviation demand and address environmental concerns. Uncertainty of oil prices, issues of energy security, an...
TL;DR: In this article, a novel cationic gemini surfactant was prepared by chlorination and quaternization, which was successfully synthesized and confirmed by infrared (IR) spectrometer.
Abstract: A novel cationic gemini surfactant was prepared by chlorination and quaternization in this paper. The target product was successfully synthesized, which was confirmed by infrared (IR) spectrometer ...
TL;DR: Carbon nitride nanosheet (CNNS) is facilely synthesized via a two-step thermal oxidative etching approach and then decorated with MnO2 nanoparticles via incipient wetness impregnation method for Hg... as mentioned in this paper.
Abstract: Carbon nitride nanosheet (CNNS) is facilely synthesized via a two-step thermal oxidative etching approach and then decorated with MnO2 nanoparticles via incipient wetness impregnation method for Hg...
TL;DR: In this paper, the authors found that high-temperature pretreatment of coal-based mineral matter in an oxidizing environment significantly enhances the leaching characteristics of rare earth elements (REEs).
Abstract: High-temperature pretreatment of coal-based mineral matter in an oxidizing environment significantly enhances the leaching characteristics of rare earth elements (REEs). A research study has found that the temperatures used in fluidized bed combustion (FBC) of coal to produce electricity are near optimum for pretreating the associated mineral matter prior to leaching to maximize the recovery of critical materials. Tests were performed on representative samples collected from preparation plants treating West Kentucky No. 13, Illinois No. 6, and Fire Clay coal seam sources as well as fly ash and bed ash samples from two FBC power plants. Acid leaching tests using 1.2 M HCl at 75 °C were performed on both the coal and the FBC ash samples. Prior to leaching, the coal samples were pretreated at temperatures of 600, 750, and 900 °C in an oxidizing environment to study the effect on leaching characteristics. The results showed that pretreatment at 600 °C for 2 h resulted in a significant increase in REE recovery...
TL;DR: In this paper, the performance of ionic/nonionic mixed surfactant systems as a promising chemical route toward enhanced oil recovery applications is investigated. And the critical micelle concentration of the (CTAB + Tween 60) surfactants was confirmed using conductivity studies and surface tensiometry.
Abstract: In this study, the efficacy of ionic/nonionic mixed surfactant systems as a promising chemical route toward enhanced oil recovery applications is investigated. The critical micelle concentration of the (CTAB + Tween 60) surfactant system was confirmed using conductivity studies and surface tensiometry. Thermodynamic analyses revealed that both adsorption and micellization processes in mixed surfactant compositions are more pronounced/effective as compared to pure surfactant solutions. Addition of polymer resulted in improved micellar stability in mixed surfactant systems by steric interactions. Ultralow interfacial tension values were obtained for mixed surfactant systems using a spinning drop technique. In the presence of carboxymethylcellulose (polymer), the viscosity of surfactant slugs are improved, leading to sweep efficiency during oil displacement process. Viscoelasticity investigations reveal that elastic modulus (G′) dominate over viscous modulus (G″) at an angular frequency of >1 rad/s, showing ...
TL;DR: In this paper, the potential of an extracted natural surfactant (Reetha) to recover heavy crude oil by examining various mechanisms accountable for improved oil recovery was examined, including the synergy of the natural surfactor, a polymer (xanthan gum), and silica nanoparticles toward the IFT behavior, emulsification, creaming index, rheology, wettability alteration, and core flooding experiments was investigated.
Abstract: The recovery of heavy crude oil is limited because of the high interfacial tension (IFT) between the crude oil and aqueous phase, which restricts the extent of emulsification and results in poor mobility. This study focuses on the potential of an extracted natural surfactant (Reetha) to recover heavy crude oil by examining various mechanisms accountable for improved oil recovery. The synergy of the natural surfactant, a polymer (xanthan gum), and silica nanoparticles toward the IFT behavior, emulsification, creaming index, rheology, wettability alteration, and core flooding experiments was investigated. The stability of the nanoparticles in the chemical solution was examined by the ζ potential values. Rheology studies were carried out to understand the complexities involved in the system. The core flooding experiments with natural surfactant–polymer chemical solutions resulted in an oil recovery of 18.5% which was enhanced to 27.3% for the nanofluid (natural surfactant–polymer–nanoparticles) system. Thus,...
TL;DR: In this article, low-salinity water injection emerges to be a cost-effective and environmentally friendly enhanced oil recovery technique and additives, such as the surfactant and nanoparticles in combina...
Abstract: Low-salinity water injection emerges to be a cost-effective and environmentally friendly enhanced oil recovery technique. Furthermore, additives, such as the surfactant and nanoparticles in combina...
TL;DR: In this article, the density functional theory was applied to investigate Hg0 adsorption over CuS(001) surface, and the results indicated that the chemisorption mechanism was responsible for the formation of Hg-S and Hg−Cu bonds.
Abstract: Copper sulfide (CuS) has been proved to be a potential alternative to traditional sorbents for control of elemental mercury (Hg0) emissions downstream of the wet flue gas desulfurization (WFGD) systems. However, the detailed reaction mechanisms involved in Hg0 adsorption over CuS surface are still unclear. The density functional theory was applied to investigate Hg0 adsorption over CuS(001) surface. The results indicated that the chemisorption mechanism was responsible for Hg0 adsorption over CuS(001) surface. The formation of Hg–S and Hg–Cu bonds was confirmed by depicting the projected densities of states profiles. The binding energies of Hg0 suggested that the crystal surface with two sulfur terminations [labeled CuS(001)–S-2] exhibited a better Hg0 adsorption activity than the crystal surface with copper and sulfur terminations [labeled CuS(001)–Cu/S]. Moreover, the adsorption of the flue gas components downstream of WFGD (oxygen, sulfur dioxide, and water vapor) was studied to understand the effect o...
TL;DR: In this article, amine-functionalized metal-organic frameworks (MOFs) are used as facile adsorbents for CO2 removal from enclosed environments, using polyethylenimine (PEI) and tetraethylenepentamine (TEN).
Abstract: Amine-functionalized metal–organic frameworks (MOFs) are facile adsorbents for CO2 removal from enclosed environments. In this study, we prepared polyethylenimine (PEI) and tetraethylenepentamine (...
TL;DR: Wax deposition in oil and gas pipelines is considered one of the most severe operational problems, and significant efforts have been made to prevent and remediate this flow assurance issue as discussed by the authors. But, it is difficult to quantify the extent of this problem.
Abstract: Wax deposition in oil and gas pipelines is considered one of the most severe operational problems, and significant efforts have been made to prevent and remediate this flow assurance issue. Chemica...
TL;DR: In the past, transportation of heavy and bitumen to downstream refineries has been accomplished by either adding a diluent or converting the vacuum residue to produce a synthetic crude oil.
Abstract: In the past, transportation of heavy and bitumen to downstream refineries has been accomplished by either adding a diluent or converting the vacuum residue to produce a synthetic crude oil. In Cana...