CO, N, and CO/N mixed gas injection for enhanced shale gas recovery and CO geological storage
《能源前沿(英文)》
2023年
第17卷
第3期
页码 428-445
doi:
10.1007/s11708-023-0865-9
摘要:
In this work, using fractured shale cores, isothermal adsorption experiments and core flooding tests were conducted to investigate the performance of injecting different gases to enhance shale gas recovery and CO2 geological storage efficiency under real reservoir conditions. The adsorption process of shale to different gases was in agreement with the extended-Langmuir model, and the adsorption capacity of CO2 was the largest, followed by CH4, and that of N2 was the smallest of the three pure gases. In addition, when the CO2 concentration in the mixed gas exceeded 50%, the adsorption capacity of the mixed gas was greater than that of CH4, and had a strong competitive adsorption effect. For the core flooding tests, pure gas injection showed that the breakthrough time of CO2 was longer than that of N2, and the CH4 recovery factor at the breakthrough time () was also higher than that of N2. The of CO2 gas injection was approximately 44.09%, while the of N2 was only 31.63%. For CO2/N2 mixed gas injection, with the increase of CO2 concentration, the increased, and the for mixed gas CO2/N2 = 8:2 was close to that of pure CO2, about 40.24%. Moreover, the breakthrough time of N2 in mixed gas was not much different from that when pure N2 was injected, while the breakthrough time of CO2 was prolonged, which indicated that with the increase of N2 concentration in the mixed gas, the breakthrough time of CO2 could be extended. Furthermore, an abnormal surge of N2 concentration in the produced gas was observed after N2 breakthrough. In regards to CO2 storage efficiency (), as the CO2 concentration increased, also increased. The of the pure CO2 gas injection was about 35.96%, while for mixed gas CO2/N2 = 8:2, was about 32.28%.
关键词:
shale gas
gas injection
competitive adsorption
enhanced shale gas recovery
CO2 geological storage
CO2 methanation and co-methanation of CO and CO2 over Mn-promoted Ni/Al2
Kechao Zhao,Zhenhua Li,Li Bian
《化学科学与工程前沿(英文)》
2016年
第10卷
第2期
页码 273-280
doi:
10.1007/s11705-016-1563-5
摘要:
A series of Mn-promoted 15 wt-% Ni/Al O catalysts were prepared by an incipient wetness impregnation method. The effect of the Mn content on the activity of the Ni/Al O catalysts for CO methanation and the co-methanation of CO and CO in a fixed-bed reactor was investigated. The catalysts were characterized by N physisorption, hydrogen temperature-programmed reduction and desorption, carbon dioxide temperature-programmed desorption, X-ray diffraction and high-resolution transmission electron microscopy. The presence of Mn increased the number of CO adsorption sites and inhibited Ni particle agglomeration due to improved Ni dispersion and weakened interactions between the nickel species and the support. The Mn-promoted 15 wt-% Ni/Al O catalysts had improved CO methanation activity especially at low temperatures (250 to 400 °C). The Mn content was varied from 0.86% to 2.54% and the best CO conversion was achieved with the 1.71Mn-Ni/Al O catalyst. The co-methanation tests on the 1.71Mn-Ni/Al O catalyst indicated that adding Mn markedly enhanced the CO methanation activity especially at low temperatures but it had little influence on the CO methanation performance. CO methanation was more sensitive to the reaction temperature and the space velocity than the CO methanation in the co-methanation process.
关键词:
Mn promotion
nickel catalysts
CO2 methanation
co-methanation of CO and CO2
An investigation of the CHOH and CO selectivity of CO hydrogenation over Cu–Ce–Zr catalysts
《化学科学与工程前沿(英文)》
2022年
第16卷
第6期
页码 950-962
doi:
10.1007/s11705-022-2162-2
摘要:
A series of Cu–Ce–Zr catalysts with different Ce contents are applied to the hydrogenation of CO2 to CO/CH3OH products. The Cu–Ce–Zr catalyst with 2 wt% Ce loading shows higher CO selectivity (SCO = 0.0%–87.8%) from 200–300 °C, while the Cu–Ce–Zr catalyst with 8 wt% Ce loading presents higher CO2 conversion ( = 5.4%–15.6%) and CH3OH selectivity ( = 97.8%–40.6%). The number of hydroxyl groups and solid solution nature play a significant role in changing the reaction pathway. The solid solution enhances the CO2 adsorption ability. At the CO2 adsorption step, a larger number of hydroxyl groups over the Cu–Ce–Zr catalyst with 8 wt% Ce loading leads to the production of H-containing adsorption species. At the CO2 hydrogenation step, a larger number of hydroxyl groups assists in encouraging the further hydrogenation of intermediate species to CH3OH and improving the hydrogenation rate. Hence, the Cu–Ce–Zr catalyst with 8 wt% Ce loading favors CH3OH selectivity and CO2 activation, while CO is preferred on the Cu–Ce–Zr catalyst with 2 wt% Ce loading, a smaller number of hydroxyl groups and a solid solution nature. Additionally, high-pressure in situ diffuse reflectance infrared Fourier transform spectroscopy shows that CO is produced from formate decomposition and that both monodentate formate and bidentate formate are active intermediate species of CO2 hydrogenation to CH3OH.
关键词:
CO2 hydrogenation
Cu–Ce–Zr
hydroxyls
CO/CH3OH selectivity
Conversion of CO into CO by high active and stable PdNi nanoparticles supported on a metal-organic framework
《化学科学与工程前沿(英文)》
2022年
第16卷
第7期
页码 1139-1148
doi:
10.1007/s11705-021-2111-5
摘要:
The solubility of Pd(NO3)2 in water is moderate whereas it is completely soluble in diluted HNO3 solution. Pd/MIL-101(Cr) and Pd/MIL-101-NH2(Cr) were synthesized by aqueous solution of Pd(NO3)2 and Pd(NO3)2 solution in dilute HNO3 and used for CO oxidation reaction. The catalysts synthesized with Pd(NO3)2 solution in dilute HNO3 showed lower activity. The aqueous solution of Pd(NO3)2 was used for synthesis of mono-metal Ni, Pd and bimetallic PdNi nanoparticles with various molar ratios supported on MOF. Pd70Ni30/MIL-101(Cr) catalyst showed higher activity than monometallic counterparts and Pd+ Ni physical mixture due to the strong synergistic effect of PdNi nanoparticles, high distribution of PdNi nanoparticles, and lower dissociation and desorption barriers. Comparison of the catalysts synthesized by MIL-101(Cr) and MIL-101-NH2(Cr) as the supports of metals showed that Pd/MIL-101-NH2(Cr) outperforms Pd/MIL-101-(Cr) because of the higher electron density of Pd resulting from the electron donor ability of the NH2 functional group. However, the same activities were observed for Pd70Ni30/MIL-101(Cr) and Pd70Ni30/MIL-101-NH2(Cr), which is due to a less uniform distribution of Pd nanoparticles in Pd70Ni30/MIL-101-NH2(Cr) originated from amorphization of MIL-101-NH2(Cr) structure during the reduction process. In contrast, Pd70Ni30/MIL-101(Cr) revealed the stable structure and activity during reduction and CO oxidation for a long time.
关键词:
CO oxidation
heterogeneous catalysis
metal-organic framework
NH2 functional group
PdNi
Reduction potential of the energy penalty for CO capture in CCS
《能源前沿(英文)》
2023年
第17卷
第3期
页码 390-399
doi:
10.1007/s11708-023-0864-x
摘要:
CO2 capture and storage (CCS) has been acknowledged as an essential part of a portfolio of technologies that are required to achieve cost-effective long-term CO2 mitigation. However, the development progress of CCS technologies is far behind the targets set by roadmaps, and engineering practices do not lead to commercial deployment. One of the crucial reasons for this delay lies in the unaffordable penalty caused by CO2 capture, even though the technology has been commonly recognized as achievable. From the aspects of separation and capture technology innovation, the potential and promising direction for solving this problem were analyzed, and correspondingly, the possible path for deployment of CCS in China was discussed. Under the carbon neutral target recently proposed by the Chinese government, the role of CCS and the key milestones for deployment were indicated.
关键词:
CO2 capture and storage (CCS)
CO2 separation
energy penalty
A coal-fired power plant integrated with biomass co-firing and CO capture for zero carbon emission
《能源前沿(英文)》
2022年
第16卷
第2期
页码 307-320
doi:
10.1007/s11708-021-0790-8
摘要:
A promising scheme for coal-fired power plants in which biomass co-firing and carbon dioxide capture technologies are adopted and the low-temperature waste heat from the CO2 capture process is recycled to heat the condensed water to achieve zero carbon emission is proposed in this paper. Based on a 660 MW supercritical coal-fired power plant, the thermal performance, emission performance, and economic performance of the proposed scheme are evaluated. In addition, a sensitivity analysis is conducted to show the effects of several key parameters on the performance of the proposed system. The results show that when the biomass mass mixing ratio is 15.40% and the CO2 capture rate is 90%, the CO2 emission of the coal-fired power plant can reach zero, indicating that the technical route proposed in this paper can indeed achieve zero carbon emission in coal-fired power plants. The net thermal efficiency decreases by 10.31%, due to the huge energy consumption of the CO2 capture unit. Besides, the cost of electricity (COE) and the cost of CO2 avoided (COA) of the proposed system are 80.37 $/MWh and 41.63 $/tCO2, respectively. The sensitivity analysis demonstrates that with the energy consumption of the reboiler decreasing from 3.22 GJ/tCO2 to 2.40 GJ/ tCO2, the efficiency penalty is reduced to 8.67%. This paper may provide reference for promoting the early realization of carbon neutrality in the power generation industry.
关键词:
coal-fired power plant
biomass co-firing
CO2 capture
zero carbon emission
performance evaluation
Ni-Co bimetallic catalyst for CH
Xiaohong LI, Jun AI, Wenying LI, Dongxiong LI
《化学科学与工程前沿(英文)》
2010年
第4卷
第4期
页码 476-480
doi:
10.1007/s11705-010-0512-y
摘要:
A co-precipitation method was employed to prepare Ni/Al O -ZrO , Co/Al O -ZrO and Ni-Co/Al O -ZrO catalysts. Their properties were characterized by N adsorption (BET), thermogravimetric analysis TGA , temperature-programmed reduction (TPR), temperature-programmed desorption (CO -TPD), and temperature-programmed surface reaction (CH -TPSR and CO -TPSR). Ni-Co/Al O -ZrO bimetallic catalyst has good performance in the reduction of active components Ni, Co and CO adsorption. Compared with mono-metallic catalyst, bimetallic catalyst could provide more active sites and CO adsorption sites (C+ CO = 2CO) for the methane-reforming reaction, and a more appropriate force formed between active components and composite support (SMSI) for the catalytic reaction. According to the CH -CO -TPSR, there were 80.9% and 81.5% higher CH and CO conversion over Ni-Co/Al O -ZrO catalyst, and its better resistance to carbon deposition, less than 0.5% of coke after 4 h reaction, was found by TGA. The high activity and excellent anti-coking of the Ni-Co/Al O -ZrO catalyst were closely related to the synergy between Ni and Co active metal, the strong metal-support interaction and the use of composite support.
关键词:
Ni-Co bimetallic catalyst
composite support
CH4 reforming with CO2
Bamboo-like -doped carbon nanotubes encapsulating M(Co, Fe)-Ni alloy for electrochemical production ofsyngas with potential-independent CO/H ratios
《化学科学与工程前沿(英文)》
2022年
第16卷
第4期
页码 498-510
doi:
10.1007/s11705-021-2082-6
摘要:
The electrochemical conversion of CO2-H2O into CO-H2 using renewable energy is a promising technique for clean syngas production. Low-cost electrocatalysts to produce tunable syngas with a potential-independent CO/H2 ratio are highly desired. Herein, a series of N-doped carbon nanotubes encapsulating binary alloy nanoparticles (MxNi-NCNT, M= Fe, Co) were successfully fabricated through the co-pyrolysis of melamine and metal precursors. The MxNi-NCNT samples exhibited bamboo-like nanotubular structures with a large specific surface area and high degree of graphitization. Their electrocatalytic performance for syngas production can be tuned by changing the alloy compositions and modifying the electronic structure of the carbon nanotube through the encapsulated metal nanoparticles. Consequently, syngas with a wide range of CO/H2 ratios, from 0.5:1 to 3.4:1, can be produced on MxNi-NCNT. More importantly, stable CO/H2 ratios of 2:1 and 1.5:1, corresponding to the ratio to produce biofuels by syngas fermentation, could be realized on Co1Ni-NCNT and Co2Ni-NCNT, respectively, over a potential window of –0.8 to –1.2 V versus the reversible hydrogen electrode. Our work provides an approach to develop low-cost and potential-independent electrocatalysts to effectively produce syngas with an adjustable CO/H2 ratio from electrochemical CO2 reduction.
关键词:
electrochemical reduction of CO2
syngas
N-doped carbon nanotubes
encapsulated alloy nanoparticles
CO/H2 ratio
Review on cryogenic technologies for CO removal from natural gas
Yujing BI, Yonglin JU
《能源前沿(英文)》
2022年
第16卷
第5期
页码 793-811
doi:
10.1007/s11708-022-0821-0
摘要:
CO2 in natural gas (NG) is prone to condense directly from gas to solid or solidify from liquid to solid at low temperatures due to its high triple point and boiling temperature, which can cause a block of equipment. Meanwhile, CO2 will also affect the calorific value of NG. Based on the above reasons, CO2 must be removed during the NG liquefaction process. Compared with conventional methods, cryogenic technologies for CO2 removal from NG have attracted wide attention due to their non-polluting and low-cost advantages. Its integration with NG liquefaction can make rational use of the cold energy and realize the purification of NG and the production of by-product liquid CO2. In this paper, the phase behavior of the CH4-CO2 binary mixture is summarized, which provides a basis for the process design of cryogenic CO2 removal from NG. Then, the detailed techniques of design and optimization for cryogenic CO2 removal in recent years are summarized, including the gas-liquid phase change technique and the gas-solid phase change technique. Finally, several improvements for further development of the cryogenic CO2 removal process are proposed. The removal process in combination with the phase change and the traditional techniques with renewable energy will be the broad prospect for future development.
关键词:
cryogenic CO2 removal
purification of natural gas (NG)
biogas upgrading
CH4-CO2 binary system
A CO and CO
Guoxing Chen, Marc Widenmeyer, Binjie Tang, Louise Kaeswurm, Ling Wang, Armin Feldhoff, Anke Weidenkaff
《化学科学与工程前沿(英文)》
2020年
第14卷
第3期
页码 405-414
doi:
10.1007/s11705-019-1886-0
摘要:
A series of novel dense mixed conducting ceramic membranes based on K NiF -type (La Ca ) (Ni Cu )O was successfully prepared through a sol-gel route. Their chemical compatibility, oxygen permeability, CO and CO tolerance, and long-term CO resistance regarding phase composition and crystal structure at different atmospheres were studied. The results show that higher Ca contents in the material lead to the formation of CaCO . A constant oxygen permeation flux of about 0.63 mL·min ·cm at 1173 K through a 0.65 mm thick membrane was measured for (La Ca ) (Ni Cu )O , using either helium or pure CO as sweep gas. Steady oxygen fluxes with no sign of deterioration of this membrane were observed with increasing CO concentration. The membrane showed excellent chemical stability towards CO for more than 1360 h and phase stability in presence of CO for 4 h at high temperature. In addition, this membrane did not deteriorate in a high-energy CO plasma. The present work demonstrates that this (La Ca ) (Ni Cu )O membrane is a promising chemically robust candidate for oxygen separation applications.
关键词:
K2NiF4 structure
oxygen permeation membrane
CO2 and CO resistances
CO2 plasma resistance
long-term robustness
标题
作者
时间
类型
操作
CO, N, and CO/N mixed gas injection for enhanced shale gas recovery and CO geological storage
期刊论文
CO2 methanation and co-methanation of CO and CO2 over Mn-promoted Ni/Al2
Kechao Zhao,Zhenhua Li,Li Bian
期刊论文
An investigation of the CHOH and CO selectivity of CO hydrogenation over Cu–Ce–Zr catalysts
期刊论文
Conversion of CO into CO by high active and stable PdNi nanoparticles supported on a metal-organic framework
期刊论文
Reduction potential of the energy penalty for CO capture in CCS
期刊论文
A coal-fired power plant integrated with biomass co-firing and CO capture for zero carbon emission
期刊论文
以净零排放为目标的封存驱动型CO2提高采收率方法
刘月亮, 芮振华
期刊论文
离岸碳捕集利用与封存技术体系研究
李姜辉,李鹏春,李彦尊,童峰
期刊论文
Ni-Co bimetallic catalyst for CH
Xiaohong LI, Jun AI, Wenying LI, Dongxiong LI
期刊论文
Bamboo-like -doped carbon nanotubes encapsulating M(Co, Fe)-Ni alloy for electrochemical production ofsyngas with potential-independent CO/H ratios
期刊论文
Frontier science and challenges on offshore carbon storage
期刊论文
Review on cryogenic technologies for CO removal from natural gas
Yujing BI, Yonglin JU
期刊论文
A CO and CO
Guoxing Chen, Marc Widenmeyer, Binjie Tang, Louise Kaeswurm, Ling Wang, Armin Feldhoff, Anke Weidenkaff
期刊论文
太阳能技术对我国未来减排CO2 的贡献
赵玉文
期刊论文
Co anchored on porphyrinic triazine-based frameworks with excellent biocompatibility for conversion ofCO in H-mediated microbial electrosynthesis
期刊论文