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Removal of Vand Fe from spent denitrification catalyst by using oxalic acid:Study of dissolution kinetics and toxicity

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Green Energy & Environment 2021年第5期6卷 660-669页

作者： Wenfen Wu Chenye Wang Xingrui Wang huiquan li CAS Key Laboratory of Green Process and Engineering National Engineering Laboratory for Hydrometallurgical Cleaner Production TechnologyInstitute of Process EngineeringChinese Academy of SciencesBeijing100190China College of Chemical and Engineering University of Chinese Academy of SciencesBeijing100049China

The selective dissolution of V and Fe from spent denitrification catalyst(SDC)with oxalic acid was investigated to minimise their environmental *** dissolution kinetics of different elements from SDC by using 0.1–1.5 mol L^(-1) oxalic acid concentration was studied at 60℃–90℃.V and Fe were preferentially released(65%and 81%)compared with Al,Ti and W within 5 min due to the redox reactions of oxalic *** dissolved fractions of Fe,V,Al,Wand Ti increased with the increase of oxalic acid concentration and reaction *** dissolution kinetic experiments were analysed and controlled diffusion with n0.92).The Arrhenius parameters of the Ea values of Ti,W,V,Fe and Al from SDC with oxalic acid were 30,26,20,19 and 11 kJ mol^(-1),*** obtained Avrami equation of V and Fe was successfully used to predict their leaching behaviour in oxalic *** characteristic leaching procedure revealed that the toxicity risk of Vand Fe metals from SDC after leaching with oxalic acid decreased to below 5 mg kg^(-1) ***,the leaching residua by oxalic acid indicated its safety for the environment.

关键词： Spent denitrification catalyst Oxalic acid Dissolution kinetic Avrami model

Incentive equilibrium strategies of transboundary industrial pollution control under emission permit trading

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Journal of Management Analytics 2019年第2期6卷 107-134页

作者： huiquan li Shiping Mao Institute of Agricultural Economics and Development Chinese Academy of Agricultural SciencesBeijingPeople’s Republic of China

In this paper,we investigate the incentive equilibrium strategies of two neighboring regions facing transboundary industrial pollution under abatement investment and emission permits trading in a differential game *** paper can be viewed as an extension of the work of Yeung[*** consistent cooperative solution in a differential game of transboundary industrial *** of Optimization Theory and Applications,134,143-160]in the context of the transboundary industrial *** with the work of Yeung[*** consistent cooperative solution in a differential game of transboundary industrial *** of Optimization Theory and Applications,134,143-160],our research significant features(i)introduce the emission permits trading into the transboundary industrial pollution control;(ii)take into account the pollution abatement investment;(iii)examine the incentive equilibrium strategies of transboundary industrial pollution control;and(iv)design an allocation mechanism for regions’cooperative ***,we illustrate the results of the paper with a numerical *** utility of this paper is how to make incentive equilibrium strategies in a situation where the neighboring regions facing transboundary industrial pollution under abatement investment and emission permits trading in a differential game setting.

关键词： incentive equilibrium transboundary pollution pollution abatement investment emission permit trading

Crystallization of calcium silicate at elevated temperatures in highly alkaline system of Na_2O–CaO–SiO_2–H_2O

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Chinese Journal of Chemical Engineering 2017年第10期25卷 1539-1544页

作者： Ganyu Zhu huiquan li Shaopeng li Xinjuan Hou Xingrui Wang Key Laboratory of Green Process and Engineering National Engineering Laboratory for Hydrometallurgical Cleaner Production TechnologyInstitute of Process EngineeringChinese Academy of Sciences School of Chemistry and Chemical Engineering University of Chinese Academy of Sciences

In Na_2O–CaO–SiO_2–H_2O system,systematic investigations of phase and morphology of calcium silicate in hydrothermal conditions were concisely conducted for high-value utilization of silicon resource in high-alumina fly ash(HAFA).The results show that crystal composition and phase may be affected by relatively low concentration of NaOH,and sodium ions are rearranged into the structure to form NaCaHSiO_4 and Na_2Ca_3H_8Si_2O_(12) with different C/S ratio at high concentration of Na *** addition,phases in wollastonite group possess the morphology of nano *** of nano fiber is attributed to the difference of surface energies between axial and radial direction,and higher temperatures lead to easier growth along radial *** preparation of C–S–H with different phases and morphologies can guide for the application of silicate solution with high alkalinity with different purposes.

关键词： Crystallization Hydrothermal Calcium silicate Nanofiber

Kinetics of the decomposition of dimethylhexane-1,6-dicarbamate to1,6-hexamethylene diisocyanate

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Chinese Journal of Chemical Engineering 2015年第5期23卷 775-779页

作者： Yan Cao huiquan li Ningbo Qin Ganyu Zhu National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process Engineering Chinese Academy of Sciences

The kinetics of the decomposition of dimethylhexane-1,6-dicarbamate to 1,6-hexamethylene diisocyanate was studied. A consecutive reaction model was established and the reaction orders for the two steps were confirmed to be 1 and 1.3 by the integral test method and the numerical differential method, respectively. The activation energies of the two steps were （56.94 4±5.90） kJ·mol^-1 and （72.07±3.47） kJ·mol^-1 with the frequency factors exp（ 12.53±1.42） min^- 1 and （ 14.254±0.84） tool^-0.33. L^0.33·min^-1, respectively. Based on the kinetic model obtained, the progress of the reaction can be calculated under given conditions.

关键词： Kinetics 1 6-Hexamethylene diisocyanate Decomposition Dimethylhexane-1 6-dicarbamate

Recent advances on the reduction of CO2 to important C2+ oxygenated chemicals and fuels

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Chinese Journal of Chemical Engineering 2018年第11期26卷 2266-2279页

作者： Jiachen li liguo Wang Yan Cao Chanjuan Zhang PengHe huiquan li CAS Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China Chemical and Biochemical Engineering Technical University of Denmark DK-2800 Lyngby Denmark Sino-Danish College University of Chinese Academy of Sciences Beijing 100049 China Sino-Danish Center for Education and Research University of Chinese Academy of Sciences Beijing 100049 Chin

The chemical utilization of CO_2 is a crucial step for the recycling of carbon resource. In recent years, the study on the conversion of CO_2 into a wide variety of C_(2+) important chemicals and fuels has received considerable attention as an emerging technology. Since CO_2 is thermodynamically stable and kinetically inert, the effective activation of CO_2 molecule for the selective transformation to target products still remains a challenge. The welldesigned CO_2 reduction route and efficient catalyst system has imposed the feasibility of CO_2 conversion into C_(2+) chemicals and fuels. In this paper, we have reviewed the recent advances on chemical conversion of CO_2 into C_(2+) chemicals and fuels with wide practical applications, including important alcohols, acetic acid, dimethyl ether, olefins and gasoline. In particular, the synthetic routes for C\\C coupling and carbon chain growth, multifunctional catalyst design and reaction mechanisms are exclusively emphasized.

关键词： CO2 Reduction C2+ Chemicals Fuels Catalysis

Enhancement of the degradation ability for organic pollutants via the synergistic effect of photoelectrocatalysis on a self-assembled perylene diimide (SA-PDI) thin film

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Science Bulletin 2019年第13期64卷 896-903页

作者： Hong Miao Jun Yang Guilong Peng huiquan li Yongfa Zhu Department of Chemistry Tsinghua UniversityBeijing 100084China School of Environment Beijing Key Laboratory for Emerging Organic Contaminants ControlState Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC)Tsinghua UniversityBeijing 100084China Anhui Provincical Key Laboratory for Degradation and Monitoring of Pollution of the Environment School of Chemistry and Materials EngineeringFuyang Normal UniversityFuyang 236037China

A self-assembled perylene diimide(SA-PDI)film was prepared on an indium-tin-oxide(ITO)substrate and acted as a photoanode for the photoelectrocatalytic(PEC)degradation of some emerging contaminants under visible light irradiation(λ>420 nm)and applied *** to the synergistic effect,the photocatalytic degradation rate by the SA-PDI film under visible light irradiation and an applied voltage of 2.1 V was 2.72 times and 14.5 times those of the PC and EC processes,*** visible light irradiation not only generated a promoting effect on electrocatalytic(EC)oxidation at potentials above1.2 V but also generated many more h+ for promoting the electrocatalytic oxidation of ***,an applied voltage above 1.2 V could effectively improve the separation rate of electrons from the SA-PDI electrodes to the Pt electrodes,and then,much more ·O2-and ·OH could be generated for improving the photocatalytic(PC)oxidation ***,the h+,·OH and ·O2-could improve the synergistic effect of phenol oxidation during the PEC ***,the SA-PDI film appeared to have satisfactory stability in the PEC *** SA-PDI film was also proven to be effective for two other contaminants,namely,2,4-dichlorophenol,and ciprofloxacin.

关键词： Photoelectrocatalytic oxidation PDI electrode Phenol Degradation

Isobaric vapor–liquid equilibrium for binary system of aniline+methyl-N-phenyl carbamate

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Chinese Journal of Chemical Engineering 2016年第10期24卷 1470-1476页

作者： Yuqian li liguo Wang Peng He Kelin Huang huiquan li Yan Cao Chemistry and Material Science College Guangxi Teacher Education University Key Laboratory of Green Process and Engineering National Engineering Laboratory for Hydrometallurgical Cleaner Production TechnologyInstitute of Process EngineeringChinese Academy of Sciences China Academy of Science & Technology Development Guangxi Branch

In this study,the quasi-static ebulliometric method was used to measure both of the vapor pressures of methyl N-phenyl carbamate(MPC),and the isobaric vapor–liquid equilibrium(VLE) data of the aniline and MPC binary *** measured vapor pressure data of MPC,at different temperature ranging from 369.60 to 389.54 K,fitted well with the Antoine *** VLE data for the aniline and MPC system at(2.00,4.00,6.00,7.00 and 8.00) k Pa were correlated by both of nonrandom two-liquid(NRTL) and Wilson *** parameters of the two models were obtained by regressing the experimental data,with the absolute temperature deviations of 0.54 K and 0.53 K,*** relative volatility of the binary system calculated was all far more than 1,which gives the conclusion that the high purity MPC can be separated from aniline and MPC binary system by rectification or distillation technology.

关键词： Vapor-liquid equilibrium Aniline Methyl N-phenyl carbamate NRTL Wilson

Vanadium metabolism investigation using substance flow and scenario analysis

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Frontiers of Environmental Science & Engineering 2014年第2期8卷 256-266页

作者： Fangfang ZHANC huiquan li Bo CHEN Xue GUAN YiZHANG Key Laboratory of Green Process and Engineering National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China Graduate School or Chinese Academy of Sciences Beijing 100049 China

Vanadium is a vital strategic resource, and vanadium metabolism is an important part of the national socio-economic system of China. This study conducts accounting and scenario analysis on the life cycle of vanadium metabolism in China. Based on the character- istics of vanadium life cycle and substance flow analysis （SFA） framework, we present a quantitative evaluation of a static anthropogenic vanadium life cycle for the year 2010. Results show that anthropogenic vanadium consumption, stocks, and new domestic scrap are at 98.2, 21.2, and 4.1 kt, respectively; new scrap is usually discarded. The overall utilization ratio of vanadium is 32.2%. A large amount of vanadium is stockpiled into tailings, debris, slags, and other spent solids. A scenario analysis was conducted to analyze the future developmental trend of vanadium metabolism in China based on the SFA frame- work and the qualitative analysis of technology advance- ment and socio-economic development. The baseline year was set as 2010. Several indicators were proposed to simulate different scenarios from 2010 to 2030. The scenario analysis indicates that the next 20 years is a critical period for the vanadium industry in China. This paper discusses relevant policies that contribute to the improvement of sustainable vanadium utilization in China.

关键词： metabolism vanadium industry substance flow analysis scenario analysis

Non-phosgene synthesis of hexamethylene-1,6-diisocyanate from thermal decomposition of hexamethylene-1,6-dicarbamate over Zn–Co bimetallic supported ZSM-5 catalyst

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Chinese Journal of Chemical Engineering 2019年第3期27卷 549-555页

作者： Yan Cao Yafang Chi Ammar Muhammad Peng He liguo Wang huiquan li CAS Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process Engineering Chinese Academy of Sciences University of Chinese Academy of Sciences

A non-phosgene route for the synthesis of hexamethylene-1,6-diisocyanate(HDI) was developed via catalytic decomposition of hexamethylene-1,6-dicarbamate(HDC) over Zn–Co bi-metallic supported ZSM-5 *** catalyst was characterized by FTIR and XRD analyses. Three solvents dioctyl sebacate(DOS), dibutyl sebacate(DBS) and 1-butyl-3-methylimidazolium tetrafluoroborate(BMIMBF_4) were investigated and compared; DOS gave better performance. The catalytic performances for thermal decomposition of HDC to HDI using DOS as solvent were then investigated, and the results showed that, under the optimized reaction conditions, i.e.,10 wt%concentration of HDC in DOS, 250 °C temperature, 60 min reaction time, 83.8% yield of HDI had been achieved over Zn–Co/ZSM-5. Decomposition of the intermediate hexamethylene-1-carbamate-6-isocyanate(HMI) over Zn–Co/ZSM-5 in DOS solvent was further studied and the results indicated that yield of HDI from HMI reached to 69.6%(98.6% HDI selectively) at 270 °C, which further increased the yield of the total HDI(HDI_(tol)) to as high as 95.0%. Recycling of catalyst showed that HDI and HMI yield slightly decreased, and by-product yield increased after the catalyst was reused for 4 times. At last possible reaction mechanism was proposed.

关键词： Non-phosgene Thermal decomposition Hexamethylene-1,6-diisocyanate Hexamethylene-1,6-dicarbamate Bimetallic supported ZSM-5 catalyst