Article
Engineering, Environmental
Chao Li, Yong Qin, Tao Guo, Jian Shen, Yi Yang
Summary: This study measured the high-pressure adsorption isotherms of two coal samples to investigate the methane adsorption process and mechanisms in coal. The results showed that micropore filling and surface adsorption are the primary adsorption mechanisms for supercritical methane in coal, with micropore filling occurring in pores smaller than 1.1 nm and surface adsorption occurring in 1-2 nm pores. Micropore filling adsorption plays a significant role in the overall methane adsorption, and the nano-confined effect and low water saturation contribute to the enrichment of free gas in deep coalbed methane (CBM). These findings provide insights into the occurrence behavior of unconventional natural gas in reservoirs.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Shuang Ju, Qiming Huang, Gang Wang, Jian Qiao, Shibin Wang, Cunli Qin
Summary: This study investigated the synergistic stabilization mechanism of SiO2 nanoparticles and SDS during foam fracturing. The results showed that an appropriate concentration of SDS can enhance the adsorption of SiO2 nanoparticles at the gas-liquid interface, thereby improving foam stability.
Article
Engineering, Environmental
Yong Li, Zhuangsen Wang, Shuheng Tang, Derek Elsworth
Summary: Differentiating between adsorbed and free methane in coal and shale is essential for gas recovery strategies and greenhouse gas control. The proposed method using nuclear magnetic resonance spectroscopy successfully determines adsorbed/free methane ratios and compares favorably with standard isothermal adsorption measurements.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Jinglei Cui, Qian Wang, Jianming Gao, Yanxia Guo, Fangqin Cheng
Summary: In this study, DTPADA-SBA-15 adsorbent was successfully prepared through modification of SBA-15, achieving selective adsorption of various REE in acidic solution. The results showed that at lower pH value, the chemical adsorption of REE by DTPADA-SBA-15 played a dominant role in selective adsorption.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Hao Wu, Yanbin Yao, Dameng Liu
Summary: This study investigated the water vapor sorption behavior in different maturity coal samples and identified two types of water adsorption mechanisms: attachment to oxygen functional groups and pore filling in hydrophilic and hydrophobic pores, respectively. The differences in water adsorption characteristics were found to be influenced by pore volume and the proportion of hydrophilic pores. The results also showed that water adsorption on methane adsorption in coal was attributed to the amount and proportion of hydrophilic pores.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Wenyong Wang, Guohao Wu, Tao Zhu, Yin Yang, Yuanyuan Zhang
Summary: The selective removal of Pb(II) ions was achieved by modifying mesoporous silica materials, SBA-NS and SBA-ENS, which showed improved adsorption performance and selectivity for Pb(II) in binary metal ion systems. The experimental results indicated that the imine N atoms on the two adsorbents played a dominant role during the Pb(II) sorption process, providing a potential solution for waste water treatment and lead recycling.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Environmental Sciences
Zeinab Ezzeddine, Isabelle Batonneau-Gener, Yannick Pouilloux
Summary: The removal of zinc ions from water was studied using two types of ordered mesoporous silica (SBA-15 and SBA-16). Both materials were modified with APTES and EDTA through post grafting methods. The modified adsorbents were characterized by various analytical techniques, and the structural integrity was maintained. Optimal adsorption conditions and maximum adsorption capacity were determined through experimental tests, and the regenerated adsorbent showed no significant decline in adsorption efficiency.
Review
Engineering, Environmental
Xiaoxi Cheng, Yuanping Cheng, Chenghao Wang, Biao Hu, Jia Wang
Summary: This paper systematically reviews and summarizes the calculation methods of adsorption phase density, including empirical methods, indirect methods, and direct methods. The accuracy of the calculation results is influenced by data processing, measurement method, and theoretical model selection. Considering the complexity of the pore system in coal, a direct calculation method for adsorption phase density taking into account multistage adsorption behavior is proposed.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Benny Kunkel, Sebastian Wohlrab
Summary: The study revealed that adding water and controlling residence time can increase the formation rate and selectivity of formaldehyde. Both the formation of formaldehyde on VOx species and its decomposition in the gas phase depend equally on the partial pressure of added water.
CATALYSIS COMMUNICATIONS
(2021)
Article
Engineering, Environmental
Dameng Liu, Yanbin Yao, Yanhai Chang
Summary: Evaluation of free and adsorption gas in the in-situ reservoir is important for coalbed methane exploration and production. Current methods for estimating the adsorbed gas content have limitations due to unreasonable or questionable mathematical assumptions. This study proposes a method using NMR and excess isothermal adsorption experiments to accurately quantify free and adsorbed methane in the reservoir.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Ming-yi Chen, Xiao-yun Chen, Liang Wang, Fu-chao Tian, Yu-meng Yang, Xue-jie Zhang, Ya-pu Yang
Summary: Coalbed methane is a new clean energy source with potential ecological damage. This study investigates the adsorption characteristics of water on coal and its impact on pore structure and methane adsorption, providing important insights for evaluating coalbed methane reserves and productivity.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Energy & Fuels
Qiming Huang, Bing Wu, Yu Liu, Zhiguo Guo, Gang Wang, Lulu Sun
Summary: The study found that there was no significant chemical reaction between the coal component and polyacrylamide. Due to the porosity of the polyacrylamide coating adhered onto the surface of the pore, it has a significant sorption capacity for methane. However, as the amount of residue entering the pores increases, the porous structure of the polyacrylamide coating becomes denser, leading to a decrease in the overall sorption capacity of the "coal-polyacrylamide" system.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Applied
Chi Hieu Nguyen, Chun-Chieh Fu, Ze-Han Chen, Thi Tuong Van Tran, Shou-Hsuan Liu, Ruey-Shin Juang
Summary: The study modified SBA-15 particles with APTES, increasing the adsorption capacity for urea and creatinine. Competitive hydrogen bonding promoted the preferential adsorption of urea over hippuric acid in binary mixtures on the APTES-modified SBA-15 adsorbents.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Hoang Trung Trinh, Thi Kim Anh Tran, Shuchi Arora, Suchi Mercy George, Jolitta Sheri, Zhixuan Li, Jae-Hun Yang, Parichart Naruphontjirakul, Kantesh Balani, Ajay Karakoti, Ajayan Vinu
Summary: Mesoporous silica-based materials are being studied as bioscaffolds for bone regeneration. Zinc ion incorporation is important for bone regeneration and antimicrobial activity. This study compares the effect of pore size, geometry, and structure on the zinc loading and release of two different mesoporous silica materials. The results show that a 5 wt% zinc loading is sufficient for antibacterial effects and osteogenic differentiation of bone marrow-derived stromal cells.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Engineering, Chemical
Haijian Li, Shengcheng Wang, Qiang Zeng, Jianhong Kang, Weiming Guan, Wentao Li
Summary: The study explores the impact of coal pore characteristics on methane adsorption heat, emphasizing the significant role of micropores in determining the methane adsorption heat. Results suggest that mesopores contribute the most to the specific surface area and pore volume of the five coal samples.