Processes
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2019
·Vol. 7
·期 6
·351
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IF 1.963
Yali Liu,Xiaorong Kang,Han Cheng
The addition of Fe2+is considered an effective method for increasing methane production, but the added Fe2+may not be absorbed by anaerobic microorganisms due to complex chemical reactions. In this study, ethylenediaminetetraacetic acid (EDTA) was used as a ligand of Fe2+(EDTA-Fe) to promote the dissolution of Fe, and the anaerobic performances of kitchen wastes (KWs) in a semi-continuous reactor were studied. The results indicated that the biogas yields and methane contents were enhanced to 594–613 mL·g−1VSadd·d−1and 63.6–64.4% at an organic loading rate (OLR) of 2.5 gVSadd·L−1·d−1due to EDTA-Fe addition. Simultaneously, the EDTA-Fe was more effective than Fe2+in preventing the acidification of KWs with a high OLR (5.0 gVSadd·L−1·d−1). In addition, the sequential extraction results showed that the water-soluble fraction of Fe in the R3 (EDTA-Fe addition) was 1.49-fold of that in the R2 with Fe2+addition. The contents of coenzymes F420 and F430 were also improved 1.09 and 1.11 times, respectively. Mechanism analysis confirmed that the EDTA enhanced methane production and operational stability by promoting the dissolution of Fe and maintaining a high content of water-soluble Fe.Keywords:semi-continuous reactor;EDTA;Fe;kitchen wastes;methane
研究领域:
环境科学
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微生物学
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
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IF 3.898
Da Ke,Minjia Wang,Jiancheng Ruan,Xinzhi Chen,Shaodong Zhou
Continuous preparation of pyromellitic dianhydride (PMDA) from durene has been studied using a fixed-bed reactor. The reaction was performed using a phosphorus-vanadium-titanium ternary catalyst. Relatively high selectivity and yield of PMDA was obtained. The in-situ characterization was combined with theoretical calculation to reveal the reaction mechanisms, and the remarkable doping effect was discussed.
研究领域:
化学工程
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催化化学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Yuhua Mao,Hao Zhang,Saad Ahmed,Shanshan Li,Shouhao Zhang,Jianli Wang
In this work, we report a novel and highly efficient catalytic membrane (PES/PNM-Ag) comprising well-dispersed silver nanoparticles (NPs). The membrane can be straightforwardly constructed via dynamic loading expansible hybrid microgels PNM-Ag into a commercially-available poly(ether sulfone) (PES) membrane with asymmetric structure. Characterization results of PNM-Ag and PES/PNM-Ag indicate that a nanoscale three-dimensional network embedded with Ag NPs was developed in membrane pores by swollen microgels. The flat-sheet membrane reactor assembled with PES/PNM-Ag can efficiently and continuously catalyze the reduction of 4-nitrophenol (apparent reaction rate constant reaching 1.12 s −1 ) and showed good stability. The improved catalytic activity was attributed to fully accessible surface of Ag NPs as well as the unique structure of the membrane, in which the reactant was restricted to flow through immobilized catalyst. Present strategy hints to design other noble metal NPs loaded catalytic membranes for efficient conversion of nitro-aromatic pollutants.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Wei-Yao Yang,Meng Wen,Hong-Da Zhang,Ya-Qiao Tian,Shi-Chao Su,Yu Lang,Zhi-Ping Zhao,Le Sang
In this work, ACB 18 -SO 3 H-Cl with dual structure Brønsted sites was prepared via chemical grafting method, and promoted the efficient production of HMF from batch to continuous reactors. The optimal catalyst was obtained by adjusting the acid etching time and the grafting amount of acidic functional groups. Through BET and NH 3 -TPD, it was found that the specific surface area of the 0.3 mm spherical activated carbon support reached 1179 m 2 /g, and the acid concentration of prepared ACB 18 -SO 3 H-Cl catalyst reached 7.86 mmol/g. The fructose conversion of 99.2 % and HMF yield of 96.2 % were achieved in stirred tank reactors (STRs) within 2 h, and 90.6 % HMF yield was obtained in micropacked bed reactors (μPBRs) within 86.4 s. Meanwhile, Py-IR and selective poisoning experiments confirmed that the Brønsted acid site is the catalytic active center, and there is a synergistic catalytic effect between the two structural Brønsted sites. The space–time yield (STY) of HMF in μPBRs can reach 2.96 kg/L/h/g, which is at least one order of magnitude larger than reported values in batch and continuous reactors. Moreover, based on the synergistic strengthening effect of μPBRs and ACB 18 -SO 3 H-Cl, the apparent activation energy for synthesizing HMF in μPBRs is lower than that of STRs.
研究领域:
化学工程
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催化材料科学
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DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2019
·Vol. 94
·期 6
·1951-1957
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IF 2.659
Zhimin Ou,Jiaying Pan,Lan Tang,Hanbing Shi
BACKGROUND Magnetic nanoparticle immobilized enzymes are attractive owing to their potential applications in many biological fields. When an alternating magnetic field is applied, the magnetic moments of the magnetic nanoparticles are apt to align in the direction of the field, and the magnetic nanoparticles experience force in the direction of the field. Thus, the magnetic nanoparticles behave like microscopic stirrers. RESULTS In this study, (R)- N -(1-phenylethyl)acetamide was prepared continuously using immobilized lipase in an alternating magnetic field. The effect of several factors on the acylation reaction were investigated. A kinetic model of the continuous acylation reaction process also was developed. The conversion of 1-phenylethanamine reached a maximum value of 41.8% with lipase concentration 75 mg mL −1 (dry weight/reaction volume), substrate concentration 500 mmol L −1 and flow rate 25 μL min −1 The enantiomeric excess of (R)- N -(1-phenylethyl)acetamide was > 98.4%. The kinetic constants of the continuous reduction were r m = 2.25 × 10 −2 mmol L –1 min −1 , k cat = 6 × 10 −4 mmol L –1 min −1 , K A = 0.75 mmol L –1 , K B = 4.36 × 10 −3 , K QA = 2.43 × 10 −2 and K BQA = 6.2 × 10 −4 mmol L –1 . The kinetic model was in good agreement with the experimental data obtained during continuous acylation reaction. CONCLUSION The results revealed that the inhibition of the acylation reaction at high substrate concentrations was eliminated during the continuous reaction. Compared with the batch acylation reaction, the continuous acylation reaction showed significantly improved lipase catalyst efficiency. © 2019 Society of Chemical Industry
研究领域:
生物化学
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化学工程
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DOI
高影响因子
ELECTROCHIMICA ACTA
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2013
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IF 3.777
Zhiqiao He,Keji Lin,Junjun Sun,Lina Wen,Chao Gao,Jianmeng Chen,Shuang Song,Yanyun Qian,Weiping Liu
A kinetic model for the electrochemical dechlorination of polychlorinated biphenyls (PCBs) will be an important contribution to the design and optimization of a continuous reactor. Initially, the electrocatalytic hydrodechlorination of 2-chlorobiphenyl (2-ClBP) to biphenyl at a palladium-modified nickel foam (Pd/Ni) cathode in a batch reactor was used as a model reaction for a quantitative study of the influences of the operating parameters, including temperature, the initial concentrations of PCBs, current density and the amount of Pd loading, on the apparent reaction rate. The dechlorination was found to follow pseudo first-order kinetics with respect to the 2-ClBP concentration. It was also found that a simple global power law rate equation , with Arrhenius dependency, can be used to describe the correlation between the pseudo first-order reaction rate constants and the reaction conditions. Subsequently, a mathematical model for predicting the performance of reductive dechlorination of 2-ClBP on Pd/Ni electrodes in a continuous stirred tank reactor was constructed, based on the batch-reaction kinetics. The suitability of the model was validated by performing experiments in and out of the range of reaction conditions applied in the batch reactor. The results show that the calculated values are a good fit to the experimental data.
研究领域:
环境科学
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电化学工程
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Selvaraj Muthusamy,Kanagaraj Rajalakshmi,Dongwei Zhu,Long Zhao,Shengjun Wang,Weihua Zhu
A novel lysosome targeting fluorophore Lyso-Rh-S-DNP was designed with integration of electron withdrawing 2,4-dintrophenyl (DNP) and electron donating salicylaldehyde (S) on rhodamine (Rh) backbone for unusual successive reaction based emission leading to the quantitative detection of H 2 S. The emission intensity was shifted linearly with the introduction of three individual range of H 2 S. The distinguishable fluorescent behavior was ascribed to the sequence of ether (C-O) cleavage and Spiro-lactam ring opening, which was verified using NMR and HR-MS techniques. In addition, the probe expressed fast response (3 min.), high selectivity and remarkably low detection limit (8 nM) towards H 2 S. A series of successful confocal scans in Hela cells and zebra fish showing H 2 S concentration dependent bioimaging (cyan, green and red) further demonstrated the applicability of this fluorophore for predicting cancer in early stages in bio-systems.
研究领域:
生物化学
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细胞生物学
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医学诊断
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Hao Zhang,Junyan Wang,Minjie Liu,Di Liu
Cu/Al 2 O 3 catalyst was developed by a double hydrolysis precipitation. Over the Cu/Al 2 O 3 catalyst, a continuous mode of N-methylations of nitroarenes with methanol was successfully achieved under the exogenous base- and H 2 - free condition. Methylation process of nitroarenes could be controlled just by adjusting reaction conditions, affording the desired N-monomethylanilines or N, N-dimethylanilines, respectively. The characterization displayed that the double hydrolysis precipitation method made active metal Cu surface enrichment and high dispersion, meanwhile endow Cu/Al 2 O 3 with more developed pore system, which were responsible for the higher performance of our catalyst relative to Cu/Al 2 O 3 -CP. Compared with the reported batch mode, our procedure possessed the merits of low cost, environment-friendliness, better controllability and wide universality.
研究领域:
催化化学
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绿色化学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）