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co2 adsorption in a confined fluidized bed of zeolite pellets: Influence of operating velocity

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Particuology 2019年第5期17卷 67-74页

作者： Rossella Girimonte Brunello Formisani Flaviano Testa Diparcimento di Ingegneria Informatica Modellistica Elettronica e Sistemistica Universita della Calabria 187030 Arcavacata di Rende Cosenza Italy

co2 adsorption is performed across a fluidized bed comprising a commercial pelletized 13X zeolite con-fined to the interstitial void network of a coarse glass sphere packed bed. compared with traditional fixed bed adsorption, the packed fluidized system allows operation across a wide-range of gas velocities without a substantial increase in pressure drop. Additionally, with respect to conventional fluidization regimes, the technique adopted herein prevents the formation of bubbles in favour of enhancing the bed expansion ability. Furthermore, for a given mass of sorbent, the C02 uptake capacity is observed to increase as a result of improved thermal conditions and in eliminating any by-pass effect at the gas-particle interface, which is associated to the suppression of bubbling.

关键词： co2 capture Adsorption Zeolite 13X confined fluidized beds Packed fluidized bed

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以co2为羧基源温和高效制水杨酸类化合物

低碳化学与化工 2025年第2期 53-60页

作者：郑修畅李国玲赵云倪中海陆诗建陆超中国矿业大学化工学院中国矿业大学碳中和研究院中电华创电力技术研究有限公司

水杨酸类化合物是一种广泛用于医药、香料、染料、农药和橡胶助剂等精细化学品的重要原料。然而基于Kolbe-Schmitt反应，由co2作为羧基源制备水杨酸类化合物时存在温度高、压力高、反应时间长和收率低等问题。提出了一种通过co2羧化苯酚... 详细信息

水杨酸类化合物是一种广泛用于医药、香料、染料、农药和橡胶助剂等精细化学品的重要原料。然而基于Kolbe-Schmitt反应，由co2作为羧基源制备水杨酸类化合物时存在温度高、压力高、反应时间长和收率低等问题。提出了一种通过co2羧化苯酚或4-取代基苯酚合成水杨酸类化合物的新方法。以KOH为脱质子碱，二甲苯为溶剂，Cs2co3、K2co3和2,4,6-三甲基苯酚钾盐（TMPK）为共催化剂，高效羧化苯酚和4-取代基苯酚制备水杨酸类化合物，并表征了各羧化产物的理化性质。系统考察了催化剂用量、co2压力、温度、助催化剂用量、反应时间和反应底物等对苯酚和4-取代基苯酚羧化反应的影响，提出了碳酸盐与TMPK共催化合成水杨酸和5-取代基水杨酸可能的反应机理。结果显示，Cs2co3+TMPK的催化剂组合有效优化了反应条件，实现了温和条件(温度为120℃、 co2压力为0.5 MPa、n（Cs2co3）:n（TMPK）:n（原料）为1:1:1和反应时间为4 h)下co2高效羧化苯酚（单程收率为60%）和4-取代基苯酚（单程收率为60%～90%）制备水杨酸类化合物。以该法合成的羧化产物邻位选择性高达100%。

关键词： Kolbe-Schmitt反应 co2 Cs2co3 2,4,6-三甲基苯酚 5-取代基水杨酸羧化

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A Molecular Foaming and Activation Strategy to Porous N-Doped Carbon Foams for Supercapacitors and co2 Capture

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Nano-Micro Letters 2020年第5期12卷 1-19页

作者： Mengyuan Zhou Yaqian Lin Huayao Xia Xiangru Wei Yan Yao Xiaoning Wang Zhangxiong Wu Particle Engineering Laboratory(CPCIA)and Suzhou Key Laboratory of Green Chemical Engineering School of Chemical and Environmental EngineeringCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 2151213JiangsuPeople’s Republic of China

Hierarchically porous carbon materials are promising for energy storage,separation and *** is desirable but fairly challenging to simultaneously create ultrahigh surface areas,large pore volumes and high N contents in these ***,we demonstrate a facile acid-base enabled in situ molecular foaming and activation strategy for the synthesis of hierarchically macro-/meso-/microporous N-doped carbon foams(HPNCFs).The key design for the synthesis is the selection of histidine(His)and potassium bicarbonate(PBC)to allow the formation of 3D foam structures by in situ foaming,the PBC/His acid-base reaction to enable a molecular mixing and subsequent a uniform chemical activation,and the stable imidazole moiety in His to sustain high N contents after *** formation mechanism of the HPNCFs is studied in *** prepared HPNCFs possess 3D macroporous frameworks with thin well-graphitized carbon walls,ultrahigh surface areas(up to 3200 m^2 g^-1),large pore volumes(up to 2.0 cm^3 g^-1),high micropore volumes(up to 0.67 cm^3 g^-1),narrowly distributed micropores and mesopores and high N contents(up to 14.6 wt%)with pyrrolic N as the predominant N *** HPNCFs are promising for supercapacitors with high specific capacitances(185-240 F g^-1),good rate capability and excellent *** are also excellent for co2 capture with a high adsorption capacity(~4.13 mmol g^-1),a large isosteric heat of adsorption(26.5 kJ mol^-1)and an excellent co2/N2 selectivity(~24).

关键词： Porous carbon foams Hierarchical pore structure Nitrogen doping Supercapacitors co2 capture

Thermal degradation of diethanolamine at stripper condition for co2 capture: Product types and reaction mechanisms

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Chinese Journal of Chemical Engineering 2019年第12期27卷 2900-2908页

作者： Idris Mohamed Saeed Brahim Si Ali Badrul Mohamed Jan Wan Jefrey Basirun Shaukat Ali Mazari Ibrahim Ali Obid Birima Department of Chemistry Faculty of ScienceUniversity of MalayaKuala Lumpur 50603Malaysia Department of Chemical Engineering Faculty of EngineeringUniversity of MalayaKuala Lumpur 50603Malaysia Department of Chemical Engineering Faculty of EngineeringDawood University of Engineering and TechnologyMA Jinnah RoadKarachi 74800Pakistan

Amine-based absorption/stripping is one of the promising technology for co2 capture from natural and industrial gas *** the process,amines and co2 undergo irreversible reactions to produce undesired compounds,which cause corrosion,foaming,increased viscosity and breakdown of equipment,ultimately contributing to the economic loss and environmental *** this study,the thermal degradation of aqueous diethanolamine in the presence and absence of dissolved co2 was *** experiments were performed in stainless steel *** results show that thermal degradation in the absence of co2 was a slow process;triethanolamine,and tris(2-aminoethyl)amine were only the degradation products identified in the mixture In addition,the rate of degradation was very low,only 3%degradation was observed after 4 *** in the presence of co2,sixteen degradation products were identified,nine of which were new degradation products reported for the first time in this *** 3-(2-hydroxyethyl)-2-oxazolidinone,1,4-bis(2-hydroxyethyl)piperazine and triethanolamine were the most abundant degradation *** remaining DEA concentration after 4 weeks was about 20%of the total amine *** most probable degradation reactions and their mechanisms are also proposed.

关键词： Diethanolamine co2 capture Degradation Mechanism

The impact of connate water saturation and salinity on oil recovery and co2 storage capacity during carbonated water injection in carbonate rock

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Chinese Journal of Chemical Engineering 2019年第7期27卷 1699-1707页

作者： Mahmood Shakiba Masoud Riazi Shahab Ayatollahi Mostafa Takband Department of Petroleum Engineering Amirkabir University of TechnologyTehranIran Enhanced Oil Recovery (EOR) Research Centre IOR/EOR Research InstituteShiraz UniversityShirazIran Petroleum Engineering Department School of Chemical and Petroleum Eng.Shiraz UniversityShirazIran School of Chemical and Petroleum Engineering Sharif University of TechnologyTehranIran

Carbonated water injection(CWI)is known as an efficient technique for both co2 storage and enhanced oil recovery(EOR).During CWI process,co2 moves from the water phase into the oil phase and results in oil *** mechanism is considered as a reason for *** fingering leading to early breakthrough and leaving a large proportion of reservoir un-swept is known as an unfavorable phenomenon during flooding ***,instability at the interface due to disturbances in porous medium promotes viscous fingering *** water makes viscous fingers longer and more irregular consisting of large number of tributaries leading to the ultimate oil recovery ***,higher in-situ water content can worsen this ***,this water can play as a barrier between oil and gas phases and adversely affect the gas diffusion,which results in EOR *** the other hand,from gas storage point of view,it should be noted that co2 solubility is not the same in the water and oil *** this study for a specified water salinity,the effects of different connate water saturations(Swc)on the ultimate oil recovery and co2 storage capacity during secondary CWI are being presented using carbonate rock samples from one of Iranian carbonate oil *** results showed higher oil recovery and co2 storage in the case of lower connate water saturation,as 14%reduction of Swc resulted in 20%and 16%higher oil recovery and co2 storage capacity,respectively.

关键词： Carbonated water connate water Carbonate reservoir Enhanced oil recovery Secondary recovery co2 storage

Single titanium-oxide species implanted in 2D g-CsN4 matrix as a highly efficient visible-light co2 reduction photocatalyst

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Nano Research 2019年第2期12卷 457-462页

作者： Shangfeng Tang Xuepeng Yin Guanyu Wang Xiuli Lu Tongbu Lu Institute for New Energy Materials & Low Carbon Technologies School of Materials Science and Engineering Tianjin University of Technology Tianjin 300384 China

A visible-light-response, efficie nt and robust photo-catalyst for co2 reduction is highly desirable. Herein, we demonstrate that single titanium-oxide species impla nted in two-dime nsion al (2D) graphitic carb on n itride (g-C3N4) matrix (2D TiO-CN) can efficie ntly photo-catalyze the reduction of co2 to co under the irradiation of visible light. The synergistic interaction between single titanium oxide species and g-C3N4 in 2D TiO-CN not only enhances the separation of photo-excited charges, but also results in visible light response of single titanium-oxide species, realizing high activity of co2 photo-reduction with extremely high co generation rate of 283.9 pmol·h^-1·g^-1, 5.7, 6.8 and 292.2 times larger than those of TQ2/CN hybrid material, CN and commercial TiO2, respectively. Time-resolved fluoresce nee and electron spin resonance spectroscopy revealed the catalytic mechanism of the fabricated 2D TiO-CN photocatalysts for co2 reduction.

关键词： single atom catalyst graphitic carbon nitride two-dimensional (2D) photocatalysts visible-light co2 reduction

In-situ incorporation of copper （Ⅱ） porphyrin functionalized zirconium MOF and TiO2 for efficient photocatalytic co2 reduction

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Science Bulletin 2019年第13期64卷 926-933页

作者： Lei Wang Pengxia Jin Shuhua Duan Houde She Jingwei Huang Qizhao Wang college of Chemistry and Chemical Engineering Key Laboratory of Eco-Environment-Related Polymer MaterialsMinistry of EducationNorthwest Normal UniversityLanzhou 730070China School of Environmental Science and Engineering Chang'an UniversityXi'an 710064China

As one of the highly effective methods to prepare catalysts for photocatalytic reduction of co2 into valueadded chemicals,using metalloporphyrin as light-harvesting mixed ligand to modify metal-organic framework(MOF)is very valuable since it can greatly improve the prophyrin dispersibility and consequently inhibit its potential ***,we employed a one-pot synthetic strategy to chemically immobilize Cu(II)tetra(4-carboxylphenyl)porphyrin(CuTCPP)into UiO-66 MOF structure through coordination ***,in-situ growth of TiO2 nanoparticles onto the MOF is actualized with the generation of CuTCPP c UiO-66/TiO2(CTU/TiO2)*** Xe lamp irradiation(λ>300 nm),the catalytic result presents that an optimal value of 31.32 μmol g^-1 h^-1 co evolution amount,about 7 times higher than that of pure TiO2 was obtained through the *** is supposed owning to a consistent augment of light absorption derived from chemically implanted porphyrin derivative,which is simultaneously functioning with an efficacious separation of photo-induced carries given by the newly engendered composites between MOF and TiO2,an effective catalytic activity and approving recyclability of CTU/TiO2 can be achieved in the photocatalytic reduction of co2 into co.

关键词： Cu (Ⅱ) tetra (4-carboxylphenyl) porphyrin (CuTCPP) Metal-organic frameworks Photocatalytic co2 reduction TiO2

Electrochemical co2 reduction over nitrogen-doped SnO2 crystal surfaces

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Journal of Energy Chemistry 2019年第6期28卷 22-30页

作者： Yuefeng Zhang Jianjun Liu Zengxi Wei Quanhui Liu Caiyun Wang Jianmin Ma School of Physics and Electronics Hunan UniversityChangsha 410082HunanChina ARC Centre of Excellence for Electromaterials Science. Intelligent Polymer Research Institute AIIM FacilityUniversity of WollongongNorth WollongongNSW 2500Australia

Crystal planes of a catalyst play crucial role in determining the electrocatalytic performance for co2 *** catalyst SnO2 can convert co2 molecules into valuable formic acid(HcoOH).Incorporating heteroatom N into SnO2 further improves its catalytic *** understand the mechanism and realize a highly efficient co2-to-HcoOH conversion,we used density functional theory(DFT)to calculate the free energy of co2 reduction reactions(co2RR)on different crystal planes of N-doped SnO2(N-SnO2).The results indicate that N-SnO2 lowered the activation energy of intermediates leading to a better catalytic performance than pure *** also discovered that the N-Sn O2 (211)plane possesses the most suitable free energy during the reduction process,exhibiting the best catalytic ability for the co2-to-HcoOH *** intermediate of co2RR on N-SnO2 is HcoO*or coOH* instead of OCHO*.These results may provide useful insights into the mechanism of co2RR,and promote the development of heteroatomdoped catalyst for efficient co2RR.

关键词： co2 reduction reaction SnO2 Crystal surface Electrocatalysis First principles

co2 Electroreduction in Ionic Liquids： A Review

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Chinese Journal of Chemistry 2018年第10期36卷 961-970页

作者： Jianpeng Feng Shaojuan Zeng Jiaqi Feng Haifeng Dong Xiangping Zhang Beijing Key Laboratory of Ionic Liquids Clean Process Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China college of Chemical and Engineering University of Chinese Academy of Sciences Beijing 100049 China

The increasing emission of carbon dioxide （co2） caused by the unrestrained consumption of fossil fuels in recent hundreds of years, has caused global environmental and social problems. Meanwhile, co2 is a cheap, abundant and renewable Cl-feedstock, which can be converted into alco- hols, ethers, acids and other value-added chemicals. compared with the thermal reactions, electrochemical reduction of co2 is more attractive because of its advantages by using the seasonal, geographical and intermittent energy （tide, wind and solar） under mild conditions. In recent years, taking ionic liquids （ILs） as electrolytes in the co2 electrochemical reduction reaction has been paid much more attention due to the advantages of lowering the overpotential of co2 electroreduction and improving the Faradaic efficiency. In this paper, we summarized the recent progresses of electrochemical re- duction of co2 in ILs electrolytes, and analyzed the reaction mechanism of co2 reaction in the electrode-electrolyte interface region by experimental and simulation methods. Finally, the research which needs to be highlighted in this area was proposed.

关键词： ionic liquids co2 reduction charge transfer electric double layer mechanism