GIEC OpenIR中国科学院广州能源研究所http://ir.giec.ac.cn:802024-03-19T14:03:25Z2024-03-19T14:03:25ZHigh syngas selectivity and near pure hydrogen production in perovskite oxygen carriers for chemical looping steam methane reformingZhao, KunZhang, RongjiangGao, YunfeiLin, YanLiu, AnqiWang, XiaoboZheng, AnqingHuang, ZhenZhao, Zenglihttp://ir.giec.ac.cn:80/handle/344007/370762023-11-21T02:29:15Z2023-11-21T02:29:15Z题名: High syngas selectivity and near pure hydrogen production in perovskite oxygen carriers for chemical looping steam methane reforming
作者: Zhao, Kun; Zhang, Rongjiang; Gao, Yunfei; Lin, Yan; Liu, Anqi; Wang, Xiaobo; Zheng, Anqing; Huang, Zhen; Zhao, Zengli
摘要: Chemical looping steam methane reforming (CL-SMR) provides an attractive route for hydrogen and syngas co-production through two successive steps of methane oxidation and steam splitting. However, there is also carbon formation through CH4 cracking which hampers the production of syngas (H-2 and CO) and the following pro-duction of pure H-2. This work prepared the perovskites La(0.95)Ce(0.05)NixFe(1-x)O(3) (x = 0, 0.2, 0.5, 0.8, 1.0) as oxygen carriers for CL-SMR. The methane activation and steam splitting were investigated based on reactivity tests on a fixed-bed reactor and various characterizations. Results showed that La0.95Ce0.05Ni0.2Fe0.8O3 and La0.95Ce0.05-Ni0.5Fe0.5O3 reached a high syngas selectivity (94.8%, 89.0%) accompanied with good methane conversion (93.1% and 95.7%) for methane partial oxidation, and near 100% hydrogen concentrations (higher than 99.6% and 99.5%) for steam splitting, indicating that additional separation step for pure hydrogen acquisition can be omitted. The H-2/CO molar ratio was maintained at the optimal value of 2.0 throughout the methane partial oxidation process. Characterizations and density functional theory calculations demonstrated that methane partial oxidation was promoted via an oxygen vacancy-mediated Mars-van-Krevelen type mechanism and the partial oxidation ability of the oxygen carrier is restricted by its content of oxygen vacancy and lattice oxygen migration rate. The proper amount of Ni doping forming the Ni-Fe synergetic effects also contributed highly to methane partial oxidation. Afterward, the deeply reduced metals combined with the oxygen vacancies provided active sites for steam splitting, hence generating pure H-2.2023-11-21T02:29:15ZHeteroatom-doping regulated Mg6MnO8 for improving C-2(+) hydrocarbons during chemical looping oxidative coupling of methaneHuang, JuZhao, KunJiang, ShicanKang, ShunshunLin, YanHuang, ZhenZheng, AnqingZhao, Zenglihttp://ir.giec.ac.cn:80/handle/344007/370732023-11-21T02:29:14Z2023-11-21T02:29:14Z题名: Heteroatom-doping regulated Mg6MnO8 for improving C-2(+) hydrocarbons during chemical looping oxidative coupling of methane
作者: Huang, Ju; Zhao, Kun; Jiang, Shican; Kang, Shunshun; Lin, Yan; Huang, Zhen; Zheng, Anqing; Zhao, Zengli
摘要: Chemical looping oxidative coupling of methane (CLOCM) is a novel process for the selective oxidization of methane to produce C-2(+) hydrocarbons. However, the high activity of oxygen carriers usually promotes the undesired complete or partial oxidation of methane to form large amounts of COx. Herein, a series of novel composite oxide carriers of Mg 6 MnO 8 doped by hetematoms (Na, W, and P) are developed to achieve selective and stable production of C-2(+) hydrocarbons from CLOCM of methane. The redox performance of hetematom-doped Mg6MnO8 was evaluated in a U-tube reactor coupling with various analytical methods. It is found that Na doping can improve the content of surface O- and Mn2+/Mn3+ species of Mg6MnO8, thus improving the C-2(+) selectivity and yield. The highest C-2(+) selectivity of 82.9% and the highest C-2(+) yield of 23.2% are obtained on 4Na-Mg6MnO8 and 10Na-Mg6MnO8, respectively. The co-doping of W can stabilize the surface Na species via the formation of Na-O-W and Na-O-Mn bonds, thus resulting in the stable performance of NaW-Mg(6)MnO(8 )in 20 redox cycles. It is thus concluded that the key to achieving CLOCM with high C-2(+) selectivity and yield is the stable formation of surface O- and Mn2+/Mn3+ species of oxygen carriers regulated by doping of hetematoms.2023-11-21T02:29:14ZData-driven fault diagnosis of FW-UAVs with consideration of multiple operation conditionsShaojun, LiangShirong, ZhangYuping, HuangXing, ZhengJian, ChengSisi, Wuhttp://ir.giec.ac.cn:80/handle/344007/370702023-11-21T02:29:12Z2023-11-21T02:29:12Z题名: Data-driven fault diagnosis of FW-UAVs with consideration of multiple operation conditions
作者: Shaojun, Liang; Shirong, Zhang; Yuping, Huang; Xing, Zheng; Jian, Cheng; Sisi, Wu
摘要: Fixed-wing Unmanned Aerial Vehicles (FW-UAVs) are intelligent aircrafts. It is of significance to carry out fault diagnosis of FW-UAVs to improve reliability and safety. An entire mission of FW-UAVs contains couple of phases; correspondingly, this paper treats FW-UAVs as multiple operation condition processes. An innovative framework is then proposed for fault diagnosis of FW-UAVs, where the process dynamics, multiple operation conditions, variable data density, and process disturbance are considered. Firstly, augmented matrixes are constructed with the data samples to involve the dynamic characteristic of FW-UAVs. Secondly, a modified DBSCAN algorithm employing Shared Nearest Neighbor based Distance (SNND-DBSCAN) and a K Nearest Neighbor algorithm employing SNND (SNND-KNN) are proposed respectively. They cooperate with each other to realize offline operation condition classification and online recognition. Thirdly, Multiple condition oriented Dynamic KPCA (M-DKPCA) algorithms incorporated with Weighted sliding window denoising (WM-DKPCA) is proposed for fault diagnosis. Finally, the proposed algorithms are tested with real flight data sets in terms of linear and nonlinear faults; and the comparisons between KPCA, DKPCA, M-DKPCA and WM-DKPCA are presented. The results confirm that the multiple condition oriented M-DKPCA and WM-DKPA algorithms are more suitable for fault diagnosis of FW-UAVs; and WSW denoising can indeed improve the fault diagnosis performance. (C) 2021 ISA. Published by Elsevier Ltd. All rights reserved.2023-11-21T02:29:12ZEnhancement mechanisms of iron powder on co-digestion of kitchen waste and Pennisetum hybridWo, DefangLi, LianhuaXing, TaoSun, YongmingJiang, Enchenhttp://ir.giec.ac.cn:80/handle/344007/370672023-11-21T02:29:11Z2023-11-21T02:29:11Z题名: Enhancement mechanisms of iron powder on co-digestion of kitchen waste and Pennisetum hybrid
作者: Wo, Defang; Li, Lianhua; Xing, Tao; Sun, Yongming; Jiang, Enchen
摘要: To investigate iron enhanced anaerobic digestion performance, a survey was conducted to examine how iron powder (IP) affected the stability of a co-digestion reactor for kitchen waste and Pennisetum hybrid in a semicontinuous mode. In addition, the mechanisms underlying this process were analyzed according to various parameters and microbial communities. The results showed that the maximum stable operational organic loading rate (OLR) for the IP reactor increased by 50% compared to that of the control reactor, while the specific methane yields and volumetric methane yields increased by 4.8%-106.8% and 6.3%-105.9%, respectively, when OLRs were 1.0-3.0 g VS/(L.d). Meanwhile, selective enrichment of propionate-utilizing bacteria and hydrogenotrophic methanogens may have promoted the conversion of volatile fatty acids while increasing gene abundance via a methane-forming pathway. The addition of IP changed the dominant microorganisms related to the methanogenesis pathway. Additionally, the occurrence of interspecies formate transfer promoted anaerobic digestion stability in the IP reactor.2023-11-21T02:29:11ZHigh-efficiency separation of CO2 from CO2-CH4 gas mixtures via gas hydrates under static conditionsCheng, ZuchengLiu, WeiguoLi, ShaohuaWang, SijiaLiu, YingyingSun, XiangChen, CongJiang, LanlanSong, Yongchenhttp://ir.giec.ac.cn:80/handle/344007/370642023-11-21T02:29:10Z2023-11-21T02:29:10Z题名: High-efficiency separation of CO2 from CO2-CH4 gas mixtures via gas hydrates under static conditions
作者: Cheng, Zucheng; Liu, Weiguo; Li, Shaohua; Wang, Sijia; Liu, Yingying; Sun, Xiang; Chen, Cong; Jiang, Lanlan; Song, Yongchen
摘要: Hydrate technology with high gas storage capacity and excellent safety features has attracted much attention for capturing CO2 from biogas to produce purified CH4. When considering operational efficiency, it is desirable to overcome technical barriers such as slow hydrate generation and low separation efficiency. Therefore, based on the properties of surfactant-enhanced hydrate generation kinetics, this work first systematically evaluated the performance of 500 ppm SDS on the separation efficiency of 40 mol% CO2 and 60 mol% CH4 simulated biogas. The experimental results show a significant increase in gas capture at higher driving forces, with the rise being dominated by the CH4 component, indicating that larger driving forces reduce hydrate selectivity to CO2-CH4 and weaken gas separation efficiency, with a maximum CO2 recovery of 84.24 +/- 1.19% at 275.15 K and 8 MPa. Interestingly, hydrate growth mainly occurred in the liquid phase, leading to the separation factor being positively correlated with the induction time with sufficient CO2 dissolution. In comparison, the gas capture per unit volume of solution could be improved by more than a factor of 2 at higher gas-liquid ratios. The best separation factor of 7.84 +/- 0.73 was achieved, and separation factors in general gradually decreased with increasing gas-liquid ratio; however, there was high-pressure failure behavior. Furthermore, the impact of the defoamer on separation efficiency was deeply investigated for SDS decomposition foaming, with results showing that the defoamer would alleviate hydrate decomposition foaming behaviour while having no significant effect on hydrate generation kinetics and separation efficiency.2023-11-21T02:29:10ZPhase equilibrium characteristics of natural gas hydrate formation at the deep-water environment of "Haima" cold seepHuang, YanyanFeng, Jing-ChunXie, YanWang, YiLi, PianZhang, Mingruihttp://ir.giec.ac.cn:80/handle/344007/370612023-11-21T02:29:09Z2023-11-21T02:29:09Z题名: Phase equilibrium characteristics of natural gas hydrate formation at the deep-water environment of "Haima" cold seep
作者: Huang, Yanyan; Feng, Jing-Chun; Xie, Yan; Wang, Yi; Li, Pian; Zhang, Mingrui
摘要: Methane seeping induced by natural gas hydrate dissociation is ubiquitous in deep-sea environment, which influences the global methane and carbon budget. Nevertheless, the phase equilibrium char-acteristics that control the stability of hydrate formation during the bubble ebullition process in the in-situ multi-component environment remain unclear. "Haima"cold seep is a typical active methane seeping environment associated with abundant methane hydrate, which necessitates unveiling the potential and stability of methane hydrate formation. This work investigated the hydrate phase equi-librium conditions based on the in-situ water depth with practical ion categories and concentrations for the first time. Results show that Sr2+ is an important ion that governs the thermal stability of methane hydrate. Mechanism of different ions categories (Ca2+, Mg2+, and Sr2+) effect on hydrate equilibria can be elucidated by the difference of charge and radius of the ion. Slightly difference of in-situ ion concentrations within the same salinity exerts on unobvious effect on hydrate formation. Moreover, the hydrate stability with H2S-bearing environment coupled with the anaerobic oxidation of methane in the deep-sea floor was enhanced compared to the CO2-bearing environment associated with aerobic oxidation of methane. Furthermore, thermal dynamic conditions of hydrate formation were less rigorous than that in the single methane environment. The response law of hydrate phase transition enthalpy was almost consistent with the phase equilibrium change. This work can give important fundamentals for the estimation of hydrate resources in the practical environment, and have insights for methane capture and fixation in the methane seeps. (C) 2022 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).2023-11-21T02:29:09ZEnhanced chemical looping gasification of biomass coupled with CO2 splitting based on carbon negative emissionWei, GuoqiangDeng, LifangYuan, HaoranYang, XixianHuang, ZhenZheng, AnqingXu, Lihttp://ir.giec.ac.cn:80/handle/344007/370522023-11-21T02:28:19Z2023-11-21T02:28:19Z题名: Enhanced chemical looping gasification of biomass coupled with CO2 splitting based on carbon negative emission
作者: Wei, Guoqiang; Deng, Lifang; Yuan, Haoran; Yang, Xixian; Huang, Zhen; Zheng, Anqing; Xu, Li
摘要: Under the background of fossil fuel consumption and global climate change, an enhanced chemical looping gasification of biomass coupled with CO2 splitting (CLGCS) was proposed in this work to produce high-quality syngas from biomass and split CO2 into CO by using Fe-based mixed oxygen carriers (OCs) without extra catalyst and excessive energy consumption, which provided a carbon negative emission technology for the cascade conversion of biomass and resource utilization of greenhouse gas. The reaction equilibrium and regulation mechanism of CLGCS were analyzed in Ellingham diagrams via theoretical calculation. Variable conditions were designed and performed to investigate the reaction performance of OCs. The intermetallic synergy was analyzed, and the improvement order of heterologous metal on lattice oxygen transfer of OCs was Co2O3 > NiO > CeO2 > CaO. The NiO modified sample exhibited excellent reaction behavior in CLGCS, which provided active sites for catalytic cracking of tar in CLG stage and activating CO2 molecules in splitting stage. Syngas with heating value 13.32 MJ/m(3) and carbon conversion 74.18% were achieved in CLG stage, corresponding to CO2 conversion 64.09% and CO yield 23.59 mmol/g in splitting stage. High temperature enhanced the endothermic reactions in CLGCS process, and the biomass occurrence ratio indicated a positive correlation with CO2 splitting. Although some OC particles agglomerated in reaction process, the pore structure and reactivity remained stable. After 20 cyclic reaction tests, the carbon conversion in CLG stage and CO2 conversion in splitting stage were kept at 67.52% and 73.5%, respectively. The reaction path of CLGCS with NiO modified OC was summarized as: Fe2O3/NiFe2O4 -> Fe/FeO/Ni -> Fe3O4/Ni. Fe2O3/NiFe2O4.2023-11-21T02:28:19ZA gating ultramicroporous metal-organic framework showing high adsorption selectivity, capacity and rate for xylene separationYe, Zi-MingZhang, Xue-FengLiu, De-XuanXu, Yan-TongWang, ChaoZheng, KaiZhou, Dong-DongHe, Chun-TingZhang, Jie-Penghttp://ir.giec.ac.cn:80/handle/344007/370492023-11-21T02:28:18Z2023-11-21T02:28:18Z题名: A gating ultramicroporous metal-organic framework showing high adsorption selectivity, capacity and rate for xylene separation
作者: Ye, Zi-Ming; Zhang, Xue-Feng; Liu, De-Xuan; Xu, Yan-Tong; Wang, Chao; Zheng, Kai; Zhou, Dong-Dong; He, Chun-Ting; Zhang, Jie-Peng
摘要: Adsorptive separation of p-xylene (pX) from xylene isomers is a key process in chemical industry, but known adsorbents cannot simultaneously achieve high adsorption selectivity, capacity, and rate. Here, we demonstrate gating ultramicropore as a solution for this challenge. Slight modification of the synthetic condition gives rise to isomeric metal-organic frameworks alpha-[Zn(pba)] (MAF-88, H(2)pba = 4-(1H-pyrazol-4-yl)benzoic acid) and beta-[Zn(pba)] (MAF-89) possessing similar pillared-column structures, porosities, and high pX capacities of 2.0 mmol g(-1), but very different framework/pore topologies, pore sizes, and pX selectivities. For binary and ternary mixtures of liquid xylene isomers, MAF-88 with narrow one-dimensional (1D) channels shows pX selectivity of 11 and 1.6, while MAF-89 with 3D-connected quasi-discrete pores shows pX selectivity up to 221 and 46, respectively. Thermogravimetry, differential scanning calorimetry, and time-dependent separation experiments reveal that the kinetic effects of the gating pores play more important roles than the thermodynamic effects, which is further confirmed by single-crystal X-ray diffraction and computational simulations.2023-11-21T02:28:18ZKey Points and Current Studies on Seepage Theories of Marine Natural Gas Hydrate-Bearing Sediments: A Narrative ReviewPeng, HaoLi, XiaosenChen, ZhaoyangZhang, YuYou, Changyuhttp://ir.giec.ac.cn:80/handle/344007/370462023-11-21T02:28:17Z2023-11-21T02:28:17Z题名: Key Points and Current Studies on Seepage Theories of Marine Natural Gas Hydrate-Bearing Sediments: A Narrative Review
作者: Peng, Hao; Li, Xiaosen; Chen, Zhaoyang; Zhang, Yu; You, Changyu
摘要: The internal fluid flow capacity of hydrate-bearing sediment (HBS) is one of the important factors affecting the efficiency of natural gas exploitation. This paper focuses on seepage studies on gas hydrates with the following contents: scope of theories' application, normalized permeability (K-t) models, extension combined with new technology, and development. No review has elucidated the prediction of original permeability (K-0) of sediments without hydrates. Moreover, there are few studies on seepage theories with new technologies, such as Computed Tomography (CT), Nuclear Magnetic Resonance (NMR), Magnetic Resonance Imaging (MRI), and resistivity. However, this review summarizes the prospects, evolution, and application of HBS seepage theories from the perspectives of experiments, numerical simulation, and microscopic visualization. Finally, we discuss the current limitations and directions of the seepage theories of HBS.2023-11-21T02:28:17ZA review on the migration and transformation of heavy metals in the process of sludge pyrolysisLi, DanniShan, RuiJiang, LixiaGu, JingZhang, YuyuanYuan, HaoranChen, Yonghttp://ir.giec.ac.cn:80/handle/344007/370432023-11-21T02:28:16Z2023-11-21T02:28:16Z题名: A review on the migration and transformation of heavy metals in the process of sludge pyrolysis
作者: Li, Danni; Shan, Rui; Jiang, Lixia; Gu, Jing; Zhang, Yuyuan; Yuan, Haoran; Chen, Yong
摘要: With the substantial increase in sludge production, the disposal of sludge and the reduction of secondary pollution by heavy metals have become one of the hottest topics in the field of pollutant control. Pyrolysis technology, an effective means of sludge treatment, facilitates the reduction of sludge volume and effectively reduces the toxicity and bioavailability of heavy metals in sludge, which promotes the reuse of sludge. Therefore, this review focuses on the migration characteristics of heavy metals in biochar during sludge pyrolysis and highlights the effect of reaction parameters such as reaction temperature, additives, and biomass co-pyrolysis on the behavior of heavy metals. Meanwhile, the current advances and the future perspectives of sludge heavy metal behavior will be prospected. It is hoped that this review may shed light on the harmless treatment and resourceful disposal of heavy metal-rich biomass.2023-11-21T02:28:16Z