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In situ carbon nanotube synthesis by the reduction of NiO/γ-Al_2O_3 catalyst in methane

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Journal of Natural Gas Chemistry 2010年第6期19卷 617-621页

作者： Dongyan Xu Haizhen Wang qingjie guo College of Chemical Engineering Qingdao University of Science and Technology Qingdao 266042 Shandong China

The synthesis of carbon nanotubes （CNTs） via chemical vapour deposition of methane on NiO/γ-Al2O3 catalyst has been *** reduction behavior of NiO/γ-Al2O3 by methane was studied using thermogravimetric （TG） and X-ray diffraction （XRD） *** was found that the NiO supported on γ-Al2O3,was reduced to Ni0 in methane atmosphere in the temperature range of 710-770℃.The catalytic activity of NiO/γ-Al2O3 for CNTs synthesis by in situ chemical vapour deposition of methane during the reduction was also *** electron microscopy （SEM） and transmission electron microscopy （TEM） were used to observe the CNTs produced at various reduction *** results indicated that the reduction temperature exhibits obvious influence on the morphology and the yield of *** with the diameter of about 20 nm were obtained at reduction temperature of 750℃,and higher reduction temperature （such as 800 and 850℃） led to an increase in CNTs diameter and a decrease in CNTs yield.

关键词： chemical vapour deposition carbon nanotubes NiO/γ-Al2O3 catalyst reduction temperature

Facile preparation of coal-based ultramicroporous carbon microspheres for selective CO_(2)capture

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Carbon Resources Conversion 2024年第3期7卷 97-105页

作者： Mei An Tuo guo qingjie guo Jiangmen Laboratory of Carbon Science and Technology the Hong Kong University of Science and Technology(Guangzhou)JiangmenGuangzhou 529000China State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering School of Chemistry and Chemical EngineeringNingxia UniversityYinchuanNingxia 750021China Key Laboratory of Clean Chemical Engineering in Universities of Shandong College of Chemical EngineeringQingdao University of Science&TechnologyQingdao 266042China

The basic structure of aromatic compounds that are abundant in coal is the carbonaceous precursor derived from carbon ***,it remains to be a huge challenge to prepare carbon microspheres using coal due to the complex construction and composition of ***,a simple and viable way to obtain coal-based microporous carbon microspheres was developed by means of ethanol pyrolysis and a sequential extraction *** as-prepared carbon microsphere featured aspherical micron particles of a uniform size(0.6-1.6㎛),abundant O-functional groups,excellent thermal stability,high SBET(415.5-983.2 m^(2)/g),and plentiful ultra-micropores(63.15-72.72%).The coal-based carbon microsphere exhibited a noteworthy CO_(2)uptake(3.19-4.97 mmol/g at 273 K and 1.0 bar),acceptable CO_(2)/N_(2)selectivity(IAST:23-46)and moderate isosteric heats(20-32 kJ/mol).This synthetic strategy is important for the preparation of ultramicroporous carbon microspheres using coal,and the synthetic carbon microspheres have promising prospects for highly efficient CO_(2)capture.

关键词： Coal Ultramicroporous Carbon microspheres Ethanolysis Sequential extraction CO_(2)capture

Energy and economic analysis of a hydrogen and ammonia co-generation system based on double chemical looping

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Chinese Journal of Chemical Engineering 2021年第8期34卷 190-198页

作者： Xin Pan Jingjing Ma Xiude Hu qingjie guo State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering Ningxia UniversityYinchuan 750021China

In this work,a model of hydrogen production by double chemical looping is *** efficiency benefit obtained was *** chemical looping hydrogen generation unit is connected in series to the downstream of a chemical looping gasification unit as an additional system for 100 MWh coal gasification,with the function of supplementary combustion to produce *** Aspen Plus software for process simulation,the production of H_(2) and N_(2) in the series system is higher than that in the independent Chemical looping gasification and Chemical looping hydrogen generation systems,and the production of hydrogen is approximately 25.63%and 12.90%higher,respectively;The study found that when the gasification temperature is 900C,steam-carbon ratio is 0.84 and oxygen-carbon ratio is 1.5,the hydrogen production rate of the system was the *** the same time,through heat exchange between logistics,high-pressure steam at 8.010×10^(4) kg·h^(-1) and medium-pressure steam at 1.101×10^(4) kg·h^(-1) are generated,and utility consumption is reduced by 61.58%,with utility costs decreasing by 48.69%.An economic estimation study found that the production cost of ammonia is 108.66 USD(t NH_(3))^(-1).Finally,cost of equipment is the main factors influencing ammonia production cost were proposed by sensitivity analysis.

关键词： Chemical looping Hydrogen Ammonia Energy evaluation Economic evaluation

Performance of anaerobic fluidized bed microbial fuel cell with different porous anodes

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Chinese Journal of Chemical Engineering 2020年第3期28卷 846-853页

作者： Xiuli Zhang Chunhu Li qingjie guo Kelei Huang Key Laboratory of Marine Chemistry Theory and Engineering Technology of Ministry of Education College of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100China Key Laboratory of Clean Chemical Processing of Shandong Province College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042China

Anode materials were used to construct microbial fuel cells(MFCs),and the characteristics of the anodes were important for successful applied performance of the *** the cyclic voltammetry(CV)method,the experiments showed that 5 wt%multiwalled carbon nanotubes(MWNTs)were optimal for the PANI/MWNT film anodes prepared using 24 polymerization *** maximum output voltage of the PANI/MWNT film anodes reached 967.7 mV with a power density of 286.63 mW·*** output voltages of 860 mV,850 mV,and870 mV were achieved when the anaerobic fluidized bed microbial fuel cell(AFBMFC)anodes consisted of carbon cloth with carbon black on one side,copper foam and carbon brushes,*** of the anodes before starting the AFBMFC by immersion in a stirred bacterial fluid significantly shortened the AFBMFC startup *** the AFBMFC was continuously run,the anode surfaces generated active microbial catalytic material.

关键词： Circulating fluidized bed Multiphase flow Porous anodes Anode modification Electrochemistry

Thermogravimetric characteristics of corn straw and bituminous coal copyrolysis based the ilmenite oxygen carriers

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Chinese Journal of Chemical Engineering 2024年第4期68卷 8-15页

作者： Pengxing Yuan Xiude Hu Jingjing Ma Tuo guo qingjie guo College of Chemical Engineering Qingdao University of Science&TechnologyQingdao 266042China State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering Ningxia UniversityYinchuan 750021China

Herein,the co-pyrolysis reaction characteristics of corn straw(CS)and bituminous coal in the presence of ilmenite oxygen carriers(OCs)are investigated via thermogravimetry coupled with mass *** results reveal that the participation of OCs weakens the devolatilization intensity of *** the CS blending ratio is<50%,the mixed fuel exhibits positive synergistic *** fitting results according to the Coats-Redfern integral method show that the solid-solid interaction between OCs and coke changes the reaction kinetics,enhancing the co-pyrolysis reactivity at the high-temperature zone(750-950C).The synergistic effect is most prominent at a 30%CS blending ratio,with copyrolysis activation energy in the range of 26.35-40.57 kJ·mol^(-1).

关键词： Oxygen carrier Co-pyrolysis Biomass Coal

Efficient CO_(2) adsorption and mechanism on nitrogen-doped porous carbons

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Frontiers of Chemical Science and Engineering 2021年第3期15卷 493-504页

作者： Yanxia Wang Xiude Hu Tuo guo Jian Hao Chongdian Si qingjie guo State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering Ningxia UniversityYinchuan 750021China College of Arts and Sciences Ferris State UniversityBig RapidsMI 49307USA

In this work,nitrogen-doped porous carbons(NACs)were fabricated as an adsorbent by urea modification and KOH *** CO_(2) adsorption mechanism for the NACs was then *** NACs are found to present a large specific surface area(1920.72-3078.99 m2·g^(-1))and high micropore percentage(61.60%-76.23%).Under a pressure of 1 bar,sample NAC-650-650 shows the highest CO_(2) adsorption capacity up to 5.96 and 3.92 mmol·g^(-1) at 0 and 25℃,*** addition,the CO_(2)/N_(2) selectivity of NAC-650-650 is 79.93,much higher than the value of 49.77 obtained for the nonnitrogen-doped carbon *** CO_(2) adsorption capacity of the NAC-650-650 sample maintains over 97% after ten *** of the results show that the CO_(2) capacity of the NACs has a linear correlation(R^(2)=0.9633)with the cumulative pore volume for a pore size less than 1.02 *** presence of nitrogen and oxygen enhances the CO_(2)/N_(2) selectivity,and pyrrole-N and hydroxy groups contribute more to the CO_(2) *** situ Fourier transform infrared spectra analysis indicates that CO_(2) is adsorbed onto the NACs as a ***,the physical adsorption mechanism is confirmed by adsorption kinetic models and the isosteric heat,and it is found to be controlled by CO_(2) *** CO_(2) adsorption kinetics for NACs at room temperature and in pure CO_(2) is in accordance with the pseudo-first-order model and Avramís fractional-order kinetic model.

关键词： porous carbon CO_(2)adsorption nitrogendoped adsorption mechanism kinetics

Retention mechanism of calcium ferrite and compositions of ash on selenium during chemical looping gasification

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Particuology 2023年第8期79卷 143-152页

作者： Ziheng Han Huifen Kang Nini Yuan Xintong guo Jingjing Ma qingjie guo State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuan750021China Key Laboratory of Clean Chemical Engineering in Universities of Shandong College of Chemical EngineeringQingdao University of Science&TechnologyQingdao266042China

Selenium pollution by coal utilization is of increasing ***-iron(Ca-Fe)oxygen carriers(OCs)and alkali metal ions have strong inhibitory effects on selenium,which can reduce the emissions of selenium *** retention mechanisms of selenium by Fe_(2)O_(3),CaFe_(2)O_(4),Ca_(2)Fe_(2)O_(5) and bottom ash are investigated during chemical looping gasification(CLG).Iron-based OC can oxidize H_(2)Se(g)to SeO_(2)(g);furthermore,lattice oxygen is released by Fe_(2)O_(3),contributing to the formation of an Fe-O-Se structure to retain selenium and form *** calcium ferrite is poorly oxidizing,it cannot oxidize H_(2)Se(g),but the CaO produced when OCs are reduced can react with H_(2)Se(g)to form CaSe(s),and this process can be promoted by H_(2)S(g).The best retention rates reached 32.301%when Ca_(2)Fe_(2)O_(5) was *** the cyclic experiment,the selenium retention of the bottom ash gradually *** metal ions in bottom ash are the main factor in retaining ***^(2+) and Mg^(2+) do not easily vaporize due to their high melting points;therefore,their selenium retention is significantly better than that of K^(+) and Na^(+).This research provided a new idea for the removal of selenium by using OCs and bottom ash par-ticles during CLG.

关键词： Selenium Chemical looping gasification Oxygen carrier Retention mechanism Ashcomposition

Simulation study on the gasification process of Ningdong coal with iron-based oxygen carrier

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Chinese Journal of Chemical Engineering 2021年第1期34卷 326-334页

作者： Fei Xie Mei An Ping Li Xiude Hu Hongcun Bai qingjie guo State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021China

Chemical looping gasification(CLG) of Ningdong coal by using Fe_(2) O_(3) as the oxygen carriers(OCs) was studied,and the gasification characteristics were obtained.A computation fluid dynamics(CFD) model based on Eulerian--Lagrangian multiphase framework was established,and a numerical simulation the coal chemical looping gasification processes in fuel reactor(FR) was *** addition,the heterogeneous reactions,homogeneous reactions and Fe_(2) O_(3) oxygen carriers' reduction reactions were considered in the gasification *** characteristics of gas flow and gasification in the FR were analyzed and it was found that the experiment results were consistent with the simulation *** results show that when the O/C mole rate was 0.5:1,the gasification temperature was 900℃ and the water vapor volume flow rate was 2.2 ml·min^(-1),the mole fraction of syngas reached a maximum value of the experimental result and simulation value were 71.5% and 70.2%,*** the O/C mole rate was 0.5:1,the gasification temperature was 900℃,and the water vapor volume flow was 1.8 ml·min^(-1);the gasification efficiency reached the maximum value was 62.2%,and the maximum carbon conversion rate was 84.0%.

关键词： Chemical looping gasification Fuel reactor Gasification characteristics Fe_(2)O_(3)oxygen carrier

Characteristics of reactivity and structures of palm kernel shell (PKS) biochar during CO_2/H_2O mixture gasification

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Chinese Journal of Chemical Engineering 2018年第10期26卷 2153-2161页

作者： guozhang Chang Ximin Yan Pengyu Qi Mei An Xiude Hu qingjie guo State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering College of Chemistry and Chemical Engineering Ningxia University Key Laboratory of Clean Chemical Processing of Shandong Province College of Chemical Engineering Qingdao University of Science and Technology

Palm kernel shell(PKS)biochars with different levels of carbon conversion were initially prepared using a tube furnace,after which the reactivity of each sample was assessed with a thermogravimetric analyzer under a CO_2 *** pore structure and carbon ordering of each biochar also examined,employing a surface area analyzer and a Raman *** results showed that the gasification index R_sof the PKS biochar decreased from 0.0305 min^(-1) at carbon conversion(x)=20% to 0.0278 min^(-1)at x=40%.The expansion of micropores was the dominant process during the pore structure evolution,ad mesopores with sizes ranging from 6 to 20,48 to 50 nm were primarily generated during gasification under a CO_2/H_2O *** proportion of amorphous carbon in the PKS biochar decreased significantly as x increased,suggesting that the proportion of ordered carbon was increased during the CO_2/H_2O mixed gasification.A significantly reduced total reaction time was observed when employing a CO_2/intermittent H_2O process along with an 83.46% reduction in the steam feed,compared with the amount required using a CO_2/H_2O atmosphere.

关键词： Palm kernel shell Reactivity Pore structure Carbon ordering degree CO2/intermittent H2O gasification