JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
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2021
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IF 4.346
Azizullah Shaikh,Caili Dai,Yongpeng Sun,Qing You,Abdul Sami Qureshi,Guang Zhao,Varel Foutou,Allah Bakhsh,Nasir Khan,Zafarullah Abro,Mingwei Zhao
After the limitations of polymer-based fracturing due to poor clean-up property during flowback after fracturing treatment, viscoelastic surfactant (VES) received very huge attention in the last three decades, especially in low permeability reservoirs. In this study, a Novel CO 2 -induced clean fracturing fluid (SDS-TMTAD-CO 2 ) is formulated with simulated formation water (23,003 mg L −1 ) after optimization experiments according to the proposed parameters (i.e., 70 °C, economical, easily preparation, and environment-friendly). The results of rheological experiments show that the apparent viscosity of the fracturing fluid system increases to a certain extent under high salt conditions and possesses sufficient self-healing property against high shear tolerance. At different temperatures (25, 50, and 70 °C), the thermodynamic properties, fluid viscoelasticity, and proppant carrying capacity meet the requirements of the fracturing fluid industry standards. After adding kerosene (0.02 mol L −1 ); the gel breaking fluid viscosity (3.2 mPa s), anti-swelling rate (91.3%), and interfacial tension (2.3 × 10 −2 mN m −1 ) are holding promising conditions during the flowback period, clay swelling, and residual oil saturation, respectively. The filtration and core damage experimental results meet the national industry standard for fracturing fluids. The SEM results show that the fluid system after reaction forms a unified adsorption film on the core surface. Hopefully, this fluid system will be proved as a good candidate by means of excellent proppant transportation ability, anti-swelling, easy gel structure breaking, low filtration, and less formation damage in low permeable formations with an increase in productivity.
研究领域:
石油工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Catalysis
·
2021
·Vol. 4
·期 5
·418-424
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IF 41.813
Wang Hai,Wang Liang,Lin Dong,Feng Xiang,Niu Yiming,Zhang Bingsen,Xiao Feng-Shou
Strong metal–support interactions (SMSIs) are crucial for the preparation of supported metal catalysts. A prevailing view is that the redox feature of the metal oxide support is the driving force behind SMSI construction. Herein we demonstrate CO 2 -induced SMSIs between irreducible oxide MgO and noble gold nanoparticles, presenting electronic and geometric features that are similar to those of classical SMSIs. The key to these interactions is activating the oxide surface by a reversible reaction, MgO + CO 2 ⇆ MgCO 3 , which leads to migration of the support onto the gold nanoparticles to form thin overlayers. The overlayer is permeable to the reactant molecules, stable under the oxidation conditions and even water tolerant, resulting in sinter-resistant gold nanoparticle catalysts. This investigation provides an approach for the rational design and optimization of supported metal catalysts based on irreducible oxides, and deepens our understanding of the mechanism of SMSI formation.
研究领域:
催化
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Dongliang Liu,Wanqing Chen,Chuan Zhou,Meijuan Fei,Fengli Liang,Yuxing Gu,Meigui Xu,Ran Ran,Wei Zhou
For solid oxide fuel cells, it is an effective strategy to enhance the oxygen reduction reaction activity of cathode through introducing active nanoparticles on electrode surface. In this study, we developed a novel cathode SrY 0.05 W 0.05 Co 0.9 O 3-δ and optimizing strategy of CO 2 -induced surface in-situ reconfiguration. The nanoscale SrCO 3 particles and the oxide nanoparticles could be produced after the treating atmosphere was switched from CO 2 to air. Both SrCO 3 nanoparticles and nano-oxides are beneficial to the oxygen reduction reaction kinetics of surface process and the area specific resistance of symmetric cell with SrY 0.05 W 0.05 Co 0.9 O 3-δ electrode decreased from 0.085 to 0.054 Ω cm 2 at 600 ℃. Although the nano-sized SrCO 3 was degraded in air over time, the oxide nanoparticles held a stable state for a long time and the resistance finally stabilized at ∼0.068 Ω cm 2 . However, for classic cathode Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ , it possesses a strong interaction with CO 2 so that the produced large-sized BaCO 3 failed to transform into nanoparticles and totally decompose. Therefore, designing the suitable cathode and tailoring the interaction between CO 2 and electrode materials are significant to realize the CO 2 -induced surface in-situ reconfiguration.
研究领域:
材料科学
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电化学
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能源材料
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催化
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Zanru Guo,Qiang Chen,Hongjian Gu,Zhanfeng He,Wenyuan Xu,Jiali Zhang,Yongxin Liu,Leyan Xiong,Longzhen Zheng,Yujun Feng
Adsorbents that are capable of controllable pollutants adsorption and release without secondary pollution are attractive in water treatment. Here, we propose eco-friendly CO2 as a trigger to switch the charge states and collapse–expansion transition of giant microgels consisting of hydrophilic acrylamide and hydrophobic 2-(diethylamino)ethyl methacrylate and demonstrated the on–off, selective, and recyclable adsorption of anionic dyes on microgels under CO2 stimulation. Apart from easy-handling separation from the water by a simple filtration process, the maximum adsorption capacity is as high as 821 mg g–1, and the adsorption isotherms and kinetics obeyed Langmuir isotherm and the pseudo-second-order kinetics models, respectively. The anionic dye can also be separated from the mixture solution using CO2-treated microgels. Moreover, a wastewater treatment prototype with microgel-packed column was fabricated. Under continuous flow condition, the dye was removed and recovered by alternative bubbling CO2 and flushing with aqueous alkali (pH 12). Thus, this type of microgels with CO2-induced protonation–deprotonation transition can serve as a cost-effective, environmentally friendly, and efficient adsorbent for water purification applications.
研究领域:
环境科学
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化学工程
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材料科学
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水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）