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CO_2/CH_4 and CH_4/N_2 separation on isomeric metal organic frameworks

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Chinese Journal of Chemical Engineering 2016年第12期24卷 1687-1694页

作者： Xiaoqing Wang libo li Jiangfeng Yang jinping li Research Institute of special Chemicals Taiyuan University of Technology Taiyuan 030024 China

Two isomeric metal-organic frameworks(MOFs) with 2-dimensional(2D) and 3-dimensional(3D) topologies both comprised of Cu(Ⅱ) and OTf(OTf = trifluoromethanesulfonate) ions were synthesized and *** CO_2,CH_4 and N_2 adsorption properties of the two isomeric MOFs were investigated from 263 K to 298 K at0.1 *** results showed that the 2D MOF exhibited a higher selectivity for CO_2 from CO_2/CH_4 and CH_4from CH_4/N_2 compared to the 3D MOF,even though it possessed a lower surface area and pore *** higher adsorption heats of gases on the 2D MOF inferred the strong adsorption potential energy in the layered *** separation experiments using CO_2/CH_4 and CH_4/N_2 mixtures on the two MOFs proved that the2 D MOF had a longer elution time than the 3D MOF as well as better separation abilities.

关键词： Metal–organic frameworks Isomeric frameworks Adsorption Separation

Bayesian parameter estimation of SST model for shock wave-boundary layer interaction flows with different strengths

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Chinese Journal of Aeronautics 2023年第4期36卷 217-236页

作者： Denggao TANG jinping li Fanzhi ZENG Yao li Chao YAN School of Aeronautic Science and Engineering Beihang UniversityBeijing 100191China

The Shock Wave-Boundary Layer Interaction(SWBli)flow generated by compression corner widely occurs in *** one of the primary methods in engineering,the Reynolds Averaged Navier-Stokes(RANS)methods usually cannot correctly predict strong SWBli *** addition to the defects of the eddy viscosity assumption,the uncertainty of the closure coeffi-cients in RANS models often significantly impacts the simulation *** study performs para-metric sensitivity analysis and Bayesian calibration on the closure coefficients of the Menter k-x Shear-Stress Transport(SST)model based on the SWBli with different ***,the para-metric sensitivity on prediction results is analyzed using the Sobol *** results indicate that the Sobol indices of wall pressure and skin friction exhibited opposite fluctuation trends with the increase of SWBli ***,the Bayesian uncertainty quantification method is adopted to obtain the posterior probability distributions and Maximum A Posteriori(MAP)estimates of the closure coefficients and the posterior uncertainty of the Quantities of Interests(QoIs).The results indicate that the prediction ability for strong SWBli of the SST model is significantly improved by using the MAP estimates,and the relative errors of QoIs are reduced dramatically.

关键词： Bayesian calibration Boundary layers Compression corner Sensitivity analysis Shear-stress transport turbu-lence model Shock waves

Selective adsorption of propene over propane on li-decorated poly(triazine imide)

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Green Energy & Environment 2022年第2期7卷 307-313页

作者： Yong Wang Xiaoxia Jia libo li Jiangfeng Yang jinping li College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan030024China Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization Taiyuan University of TechnologyTaiyuan030024China College of Chemistry and Chemical Engineering Taiyuan University of TechnologyTaiyuan030024China

Solid adsorbents that simultaneously have high selectivity and uptake capacity are highly promising as alternatives to conventional cryogenic distillation of propene/propane(C_(3)H_(6)/C_(3)H_(8)) *** unsaturated metal sites(CUS) plays a vital role in selective adsorption of olefins over *** poly(triazine imide)(PTI) nanosheets can reach rapid gas adsorption equilibrium,due to its large surface-tovolume *** this work,combining the advantages of the CUS and the PTI nanosheets,li CUSs were introduced into the PTI nanosheets for C_(3)H_(6)/C_(3)H_(8) *** functional theory(DFT) calculations demonstrated the thermodynamic feasibility of incorporating li CUSs into the PTI *** highly exposed li CUSs were predicted to have a higher adsorption affinity toward C_(3)H_(6) than C_(3)H_(8).Using the DFTderived force field parameters,we further performed grand canonical Monte Carlo(GCMC) simulations to investigate C_(3)H_(6)/C_(3)H_(8) adsorption on the li–PTI complexes slit pore model with different pore widths(H).We found that the li–PTI complexes display considerable C_(3)H_(6)/C_(3)H_(8) selectivity(4.2–7.9) under relevant ***,the li–PTI complexes slit pore have large C_(3)H_(6) working capacities(1.5–4.0 mmol g-1),superior to those calculated for the most of adsorbent materials that have been *** li–PTI complexes with slit pore architecture show potential as C_(3)H_(6)/C_(3)H_(8) separation materials.

关键词： materials adsorption complexes

Investigation of dual ignition for a detonation-driven shock tunnel in forward driving mode

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Chinese Journal of Aeronautics 2020年第5期33卷 1468-1475页

作者： Qiu WANG Kai LUO Jiwei li jinping li Wei ZHAO State Key Laboratory of High Temperature Gas Dynamics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

A detonation-driven shock tunnel is useful as a ground test facility for hypersonic flow *** forward detonation driving mode is usually used to achieve high-enthalpy flows due to its strong driving ***,the strong detonation wave front results in diaphragm fragments that disturb the test flow and scratch the nozzle or test *** this study,a dual ignition system was developed to burst a metal diaphragm without fragmentation in the forward driving mode.A series of experiments were conducted to validate the proposed *** influences of the delay time setting on the test conditions were investigated in *** simulations were also conducted to obtain a better understanding of the wave processes in the shock *** results showed that the dual ignition system solved the diaphragm issues in the forward driving *** test time was shortened due to the additional ignition close to the primary diaphragm;the smaller the delay time,the shorter the effective test ***,a small amount of time loss is considered worthwhile because the severe diaphragm problems have been solved.

关键词： Shock tunnel Detonation driver Diaphragm Dual ignition High-enthalpy flow

Nitrogen rejection from low quality natural gas by pressure swing adsorption experiments and simulation using dynamic adsorption isotherms

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Chinese Journal of Chemical Engineering 2022年第2期35卷 120-129页

作者： Xinran Zhang Hua Shang Jiangfeng Yang libo li jinping li Research Institute of Special Chemicals College of Chemistry and Chemical EngineeringTaiyuan University of TechnologyTaiyuan 030024China Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization Taiyuan 030024China

In order to remove N_(2) from low quality natural gas,a mathematical model has been established by Aspen adsorption,using the CH_(4)-selective sorbent silicalite-1 *** dynamic adsorption isotherm was first simulated by breakthrough simulation of a CH_(4)/N_(2) mixture at different adsorption pressures and feed flow rates based on breakthrough *** resulting simulated CH_(4) dynamic adsorption amounts were very close to the experimental data at three different adsorption pressures(100,200,and 300 kPa).Moreover,a single-bed,three-step pressure swing adsorption(PSA)experiment was performed,and the results were in good agreement with the simulated data,further corroborating the accuracy of the gas dynamic adsorption isotherm obtained by the simulation ***,based on the simulated dynamic adsorption isotherm of CH_(4) and N_(2),a four-bed,eight-step PSA process has been designed,which enriched 75%(vol)CH_(4) and 80%(vol)CH_(4) to 95%(vol)and 99%(vol),and provided 99%(vol)recovery.

关键词： Natural gas Silicalite-1 Simulation Dynamic adsorption Pressure swing adsorption process

Shaping of metal-organic frameworks through a calcium alginate method towards ethylene/ethane separation

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Chinese Journal of Chemical Engineering 2022年第2期35卷 17-24页

作者： Jinlong li Xiaoqing Wang Puxu liu Xiaohua liu libo li jinping li College of Chemistry and Chemical Engineering Shanxi Key Laboratory of Gas Energy Efficient and Clean UtilizationTaiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Coal Science and Technology Ministry of Education and Shanxi ProvinceTaiyuan University of TechnologyTaiyuan 030024China

The separation of ethylene and ethane is a crucial,challenging and cost-intensive process in chemical ***-organic frameworks(MOFs)are a class of novel porous adsorbents used for the separation of ethylene/ethane ***,MOFs are normally crystalline powders that cause multiple problems,such as dust,abrasion and heat/mass loss,as well as significant pressure drops on the adsorption bed resulting in a sudden stop in *** solve these issues,we have prepared four different sphere-shaped adsorbents,including Mg-gallate,Co-gallate,MUV-10(Mn)and MIL-53(Al)using a calcium alginate method to achieve excellent ethylene/ethane separation *** performance of the sphere-shaped adsorbents has been validated using mechanical strength measurements,powder X-ray diffraction,scanning electron microscopy,thermogravimetric analysis,gas adsorption isotherms and dynamic breakthrough *** excellent mechanical strength of these sphere-shaped adsorbents meets the criteria for industrial application in gas ***,the energy consumption and operating cost will be further reduced in the ethylene production *** believe that this shaping method will open a prosperous route to the development of MOFs toward higher technology levels and their commercial application.

关键词： Metal-organic frameworks Alginates Shaping Mechanical properties Adsorption Separation

Performance of Copper Calorimeter for Heat Transfer Measurement in High Enthalpy Shock Tunnel

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Journal of Thermal Science 2018年第4期27卷 373-381页

作者： WANG Qiu li Jiwei li jinping ZHAO Wei JIANG Zonglin State Key Laboratory of High Temperature Gas Dynamics Institute of Mechanics Chinese Academy of Sciences School of Engineering Science University of Chinese Academy of Sciences

Copper calorimeter, based on a calorimetric principle, offers a solution for heat transfer measurement in high enthalpy situation, especially in the erosive flow of high enthalpy shock tunnels. In this study, we numerically investigated the measuring performance of copper calorimeters. Non-ideal effects, such as heat loss to the insulator around and replacement of the average temperature of the copper element by the junction temperature, were discussed in detail. The influences of copper element thickness, copper/constantan wires thickness and sensor diameter were also estimated, with the aim to provide theoretical guidance for the design of copper calorimeter. In addition, corresponding experiments in JF10 high enthalpy shock tunnel were carried out against the data of coaxial thermocouples for verification. Results showed that the non-ideal thermal environment of a copper calorimeter(heat exchange with its surroundings) would result in a smaller measuring heat flux comparing to the one actually loaded; proper thickness of copper element matching the effective test time of shock tunnel was suggested. Besides, preliminary experimental results with corrections showed reasonable agreement with the heat flux of thermocouples, with an average deviation of 8%. Over all, this gauge developed extends and supplements the high enthalpy shock tunnel heat transfer measurements made by other techniques.

关键词： copper calorimeter high enthalpy shock tunnel heat transfer hypersonic

Enhanced properties of solid solution (CeZr)O_2 modified with metal oxides for catalytic oxidation of low-concentration methane

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Chinese Journal of Chemical Engineering 2017年第2期25卷 187-192页

作者： Tianyu Guo Jianping Du Jinting wu jinping li Research Institute of Special Chemicals Taiyuan University of Technology Taiyuan 030024China College of Chemistry and Chemical Engineering Taiyuan University of Technology Taiyuan 030024China

The solid solution （CeZr）02 catalyst was synthesized, and it was modified with metal oxides by incipient impreg- nation. Morphology and structure were characterized by X-ray diffraction, transmission electron microscope, ni- trogen ad/desorption and H2-temperature program reduction techniques. The catalytic properties of methane oxidation were also investigated. The results showed that solid solution possessed a mesoporous structure and exhibited excellent catalytic performance. The activity of solid solution was improved effectively by nickel dop- ing, and the optimal loading is 15 wt%. The stability of （CeZr）02 and modified （CeZr）02 indicated that the struc- ture of pristine solid solution played a key role in promoting molecules diffusion and spatial confining oxide particle sintering.

关键词： MethaneCatalystSolid solutionMetal doping

One-step synthesis of N,P co-doped porous carbon electrocatalyst for highly efficient nitrogen fixation

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Nano Research 2022年第3期15卷 1779-1785页

作者： Sijia Zhao Jin Wang Peng Wang Shuang Wang jinping li College of Environmental Science and Engineering Taiyuan University of TechnologyJinzhong 030600China Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization Taiyuan University of TechnologyTaiyuan 030024China

Heteroatom-doped porous carbon has attracted many researchers’interests owing to their hierarchical porous and more active sites for nitrogen reduction reaction(NRR).However,the development of simple synthesis strategies to fabricate efficient catalyst is still remaining a *** this work,a series of N,P co-doped porous carbon were prepared by one-step pyrolysis of zeolitic imidazolate framework(ZIF-8)and triphenylphosphine(TPP)under nitrogen *** obtained catalyst by calcinating ZIF-8 and TPP with the mass ratio of 1:5 for three hours was named as PN-C-ZIF-8,which exhibited a high yield rate of ammonia(43.39μg·h^(–1)·mg^(–1)cat.)and Faraday efficiency(16.67%)in 0.05 M H2SO4 at–0.3 *** importantly,the PN-C-ZIF-8 catalyst had superior selectivity that no hydrazine by-products were detected and long-term durability for 72 *** study provides an idea for the convenient design and preparation of heteroatom doped carbon materials.

关键词： N P co-doped carbon-based catalyst electrochemical ammonia synthesis metal organic framework pyrolysis