CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Fuyang Huang,Jing Lin,Bin Wang,Quan Long,Weiguo Tu
Biochar was used to enrobe artificially synthesized mordenite by co-pyrolysis, and the performance of the composite in removing lead from dilute solutions was compared with that of the mordenite alone. The optimal parameters for the hydrothermal synthesis of mordenite were as follows: crystallization temperature of 180℃, crystallization time of 4 days, pH value of 11, and aging time of 24 h. The optimal mass ratio of mordenite to biochar was 20:1, and the pyrolysis temperature was 500℃. Adsorption equilibrium was reached within 3 h, yielding a total average lead removal of 78.9 % for mordenite alone and 98.6 % for the composite. Pseudo-second-order kinetics and Langmuir isotherms adequately described the data. The predicted maximum adsorption capacities were 156.6 mg/g for the mordenite alone and 283.4 mg/g for the composite. When the initial concentration of Pb(Ⅱ) was 80 mg/L, the optimum doses were determined to be 6–7 g/L for the mordenite and 5–6 g/L for the composite. At pH less than 7, mordenite removed up to 80 % of the lead and the composite removed between 90 % and 100 %. Coexisting ions had little effect on mordenite, but K(I), Ca(II), and Mg(II) could significantly increase the adsorption efficiency by up to 5.7 % for the composite. Furthermore, tannic acid and fulvic acid showed a promoting effect. Adsorption mechanisms were proposed based on the characterization results of the materials before and after adsorption, batch experiments, and density functional theory calculations. Specifically, mordenite adsorption was found to be based primarily on electrostatic attraction, surface complexation and ion exchange. Adsorption by the composite also involved π-electronic interaction and coprecipitation. In general, the composite exhibited better adsorption performance than mordenite alone.
研究领域:
环境科学
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材料科学
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2026
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IF 5.1
Xuhong Liu,Yifan Wang,Ying Li,Minxing Wang,Hu Liu,Xiaomin Zhang,Jing Lv,Ji Qi,Shiwei Wang,Shouying Huang,Xinbin Ma
Zeolites are widely used in acid-catalyzed reactions, where molecular transport is often limited by surface diffusion barriers from external defects. The issue is especially critical for Mordenite (MOR), which serves as the catalyst of choice for the dimethyl ether (DME) carbonylation reaction——a key step in the synthetic ethanol process. Here, a seed-assisted secondary growth strategy regulated the density of surface Si–OH defects in MOR zeolites. By tuning secondary crystallization time, we obtained MOR samples with controlled defect density, morphology, and framework composition. Multiple characterization techniques quantified the evolution of surface defects and Brønsted acid sites, especially in 8-MR channels. Diffusion kinetics and catalytic tests linked defect regulation, diffusion behavior, and catalytic performance. Reducing surface Si–OH-related adsorption and diffusion resistance enhanced apparent activity. This study demonstrates secondary growth as an effective approach to engineer zeolite surfaces and clarifies how surface defects control diffusion in acid catalysis.
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JOURNAL OF MATERIALS SCIENCE
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2022
·Vol. 57
·期 31
·14756-14771
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IF 4.682
Cai Menglu,Wang Xiaozhong,Cao Wenhui,Chen Yingqi,Dai Liyan
A fine-tuned mordenite was prepared to overcome the low selectivity of tert-amyl anthracene production in the direct alkylation of anthracene. Herein, a series of boric acid-modified Fe-Zr mordenite materials were prepared, and tert-amyl anthracene was smoothly and efficiently obtained over these catalysts. The boron sites in modified catalyst promoted the alcohol dehydrogenation, which benefited the reaction conversion. Moreover, the existence of Brønsted and Lewis acid sites was the key in alkylation reaction, making 1.0B-Fe-Zr/MOR good reactivity (Conv. 47.8%, Sel. 91.4%). Calculated results correlated the products properties with catalyst structures, verifying that boric acid-modified Fe-Zr/MOR was a successful shape-selective catalyst. The present work opens a new frontier for a sustainable and high-selective method to process anthracene alkylation. Graphical abstract
研究领域:
催化化学
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材料科学
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有机合成
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DOI
高影响因子
CATALYSIS LETTERS
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2018
·Vol. 148
·期 11
·3492-3501
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IF 2.911
Wang Xueyuan,Chen Li,Huang Deqi,Yue Jinfang,Luo Zhichen,Zeng Tao
Abstract The views on catalytic activity of zeolite in isomerization of α -pinene have not came to an agreement. Thus, the key active substance in zeolite was further studied through experiments. H-mordenite was treated in three ways: (i) calcination under nitrogen flows, (ii) calcination under oxygen flows, (iii) calcination under nitrogen flows after alkali treatment. The properties of modified zeolites were investigated by methods of SEM, EDS, XRD, nitrogen adsorption, NH 3 -TPD, Py-IR, and 29 Si and 27 Al MAS NMR. The results showed that the zeolites produced mesoporous after 0.4M NaOH solution soaking and calcinations above 500 °C, but it had a slight effect on the change of micropore volumes. Comparison of zeolite acid sites amount under different roasting temperature by NH 3 -TPD showed that the decrease of acid sites amount was mainly related to the roasting temperature. Py-IR and 27 Al MAS NMR experiment revealed that Lewis acid was produced by framework aluminum. Finally, Analysis on the influencing factors we studied of H-mordenite catalytic activity in this paper suggested that, in isomerization of α -pinene, the relative concentration of six-coordination aluminum in zeolite is the dominant factor of provided catalytic activity of H-mordenite. Graphical abstract
研究领域:
化学工程
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催化科学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2026
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IF 13.2
Zhifu Liu,Guanghui Shi,Shuzhuang Sun,Yong Wang,Jingyue Shang,Songbai Hu,Wenkang Deng,Chuhan Fu,Chenghao Liu,Xiao Wang,Tao Qi,Guoping Hu
Mordenite (MOR) is a widely recognized zeolite for direct air capture (DAC) of CO 2 , attributed to its high adsorption capacity and low adsorption heat. However, current approaches to promote Na + enrichment in 8-member ring channel (8-MRz) of MOR through regulating the Si/Al ratio or controlling Al distribution are constrained by synthesis controllability and cost, limiting further adsorption capacity improvements. Here, we demonstrate a straightforward and effective modification of Na-MOR via Li + -exchange, improving its performance for DAC of CO 2 . Due to its higher charge-to-size ratio compared to Na + , Li + concurrently enlarges aperture size and enhances pore polarity of 8-member ring side pocket (8-MRy). This synergistic spatial and energetic interplay resulted in Li 0.90 Na-MOR exhibiting faster kinetics and a higher CO 2 adsorption capacity (1.42 mmol g −1 ) at 400 ppm compared to Na-MOR (1.02 mmol g −1 ). In situ diffuse reflectance infrared fourier transform spectra (DRIFTS) and density functional theory (DFT) analyses confirm that Li + exchange augments charge density within the confined space of 8-MRy, promoting stable co-adsorption of multiple CO 2 molecules. This work advances the understanding of confinement effects on CO 2 adsorption and paves the way for advanced adsorbent design.
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高影响因子
Journal of Water Process Engineering
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2024
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IF 6.3
Yixin Pan,Yingying Zhou,Lujia Chen,Liping Deng,Yue Zeng,Peng Sha
In this study, mordenite-supported nanoscale zero-valent iron (nZVI@MOR) composites were prepared for the in-situ remediation of Cr(VI) from groundwater. Batch experiments and dynamic column tests were conducted to investigate the adsorption mechanism and long-term removal performance. The batch results revealed that the optimum pH for Cr(VI) adsorption was ∼3 with a capacity of 101.52 mg/g, following an endothermic adsorption process. The dynamic column test results showed that higher seepage velocities resulted in rapid remediation failure, but an increase in adsorption capacity which increased from 9.61 to 15.53 mg/g with the increase of seepage velocity from 3.9 to 15.6 mL/h at Cr(VI) initial concentration of 20 mg/L, which due to the establishment of dominant seepage channels at elevated velocities, facilitating flow circumvention of the nZVI@MOR composites. The experimental breakthrough curve was best fitted by the Thomas model, with the agreement of fit positively correlated with effective remediation time. The mechanism underlying Cr(VI) removal involves the electrostatic attraction of Cr(VI) to the surface of nZVI@MOR, subsequent reduction to Cr(III) by nZVI as an electron donor to form a complex precipitation for remediation. This result suggests that nZVI@MOR can effectively achieve long-term remediation of Cr(VI)-contaminated groundwater by appropriately controlling the flow rate and material filling methods.
研究领域:
环境科学
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材料科学
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2022
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IF 5.876
Menglu Cai,Xiaozhong Wang,Yiming Mo,Yingqi Chen,Liyan Dai
The selectivity limitations of tert-butylation of naphthalene for obtaining 2,6-di-tert-butylnaphathalene (DTBN) was overcame (2,6-/2,7-DTBN>30) over fine-tuned mordenite . With citric acid (CA) and zirconium modification, the synergistic effect of the alkylation catalyst was promoted and the ratio of 2.6-/2,7-DTBN increased after controlling the reaction conditions. Only requires 5.0 equivalents of solvent, 3.0 equivalents of tert-butanol and 20 wt% of catalyst dosage, the ratio of 2,6-DTBN/2,7-DTBN can reach to 49, overcoming the selectivity barriers in naphthalene alkylation reaction. Present study reveals that high 2,6-selectivity can be realized with the optimized acidity, enhanced synergistic effect and fine-tuned zeolite structures.
研究领域:
化学催化
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材料科学
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有机合成
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Yixin Pan,Leilei Sun,Zhixin Yu,Xiahui Guo,Lujia Chen,Man Huang
In this study, a composite material (FeS-Mor) of nano ferrous sulfide (FeS) and mordenite was prepared by coprecipitation method using mordenite as a stabilizer to prevent the aggregation of FeS to achieve the purpose of efficient removal of chromium from water. Experimental results revealed that the optimum pH for Cr(VI) removal was ∼ 2 with a removal capacity of 199.0 mg/g and efficiency of 99.5 % at 303 K. Common co-existing cations of Na + , Ca 2+ and K + promoted the removal efficiency, while Mg 2+ inhibited the removal of Cr(VI). While Common anions of SO 4 2− , CO 3 2− , Cl − and NO 3 − inhibited chromium removal. The pseudo-second-order kinetics model fitted the kinetic removal of Cr(VI) onto FeS-Mor composites best under absent/present co-existing cations, indicating that chemical reduction and complexation dominated the removal process. The thermodynamic results were best described with the Freundlich model and showed an endothermic process of Cr(VI) removal. The FeS-Mor composites with FeS:Mor mass ratio in the range of 1:1–1:2 exhibited the best performance in removal efficiency and reusability. These results reveal that introducing mordenite to develop an efficient FeS-based nanocomposite system can significantly improve the performance of chromium remediation from aqueous solutions.
研究领域:
环境科学
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材料科学
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2022
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IF 5.141
Teng Du,Miao Cui,Yue Chao,Yuxuan Xiao,Ziqi Ren,Yonglin An,Changgong Meng
Photocatalytic application is obstructed by the self-aggregation and low specific surface area of nano materials. High dispersion of SmVO 4 nanoparticles on HMOR zeolite (HMOR) were prepared by template-free method. Not only the agglomeration of nanomaterials is restrained, but also the combination of low-cost zeolite and semiconductor to prepare high-performance photocatalyst is conducive to the rational utilization of resources. Sm(NO 3 ) 3 ·6H 2 O and NH 4 VO 3 were used as precursors, and mixed with HMOR to prepare SmVO 4 /HMOR by precipitation method.. This method does not use any templates and surfactants, realizing the high dispersion of SmVO 4 nanoparticles on the surface of HMOR with the particle size are 17 ∼ 23 nm. The photocatalytic activity of SmVO 4 /HMOR was tested by degradation of rhodamine B (RhB). Compared with the monomer of SmVO 4 , the degradation rate of 29.81 wt% SmVO 4 /HMOR was increased from 33.12 % to 70.99 % under visible light irradiation for 2.5 h. The rate constant k (0.50 h −1 ) was boosted to 2.9 times as much as SmVO 4 monomer (0.17 h −1 ). When 3.7 wt% H 2 O 2 (30 %) was added into the photocatalytic system, the photocatalytic degradation rate could reach 93.26 % within 30 min. The synergistic effect of SmVO 4 and HMOR is critical on the improvement of the removal efficiency of RhB. SmVO 4 in the form of nanoparticles on the HMOR support has high photocatalytic activity. In addition, HMOR acted as electron acceptor to accelerate the transfer efficiency of photoelectrons, inhibiting the recombination of charges and improve the photocatalytic efficiency.
研究领域:
材料科学
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环境科学
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高影响因子
JOURNAL OF THE ENERGY INSTITUTE
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2021
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IF 6.186
Lin Hu,Xian-Yong Wei,Yu-Hong Kang,Xian-Hou Guo,Mei-Ling Xu,Zhi-Ming Zong
Recently high yield of cycloalkanes originates from selective hydrodeoxygenation (HDO) of lignin-derived bio-oil under mild conditions, which still encounters the great challenges. Herein, mordenite-supported ruthenium bifunctional catalyst (Ru 3% /M) was prepared by using the deposition-precipitation (DP) method for the HDO reaction of the petroleum ether-extractable portions (PEEP) from alkali catalytic ethanolysis of lignin (CEOL). Ru 3% /M catalyst was characterized systematically by XRD, XPS , FTIRS , NH 3 -TPD, N 2 -adsorption, SEM , and TEM, indicating that it had the moderate acid sites and uniform Ru nanoparticles dispersion. The synthesized catalyst was further tested for the HDO performance of diphenyl ether, oxybis(methylene)dibenzene, and anisole, respectively. Results showed that three lignin model compounds can be converted to high yield of cycloalkanes under 160 °C and 3 MPa H 2 in n -hexane. This catalyst showed the high catalytic activity for diphenyl ether HDO reaction, the conversion decreased slightly to 87.6% after five recycle times. Furthermore, catalyst feed mass was the key factor for HDO reaction of raw PEEP from CEOL, promoting the HDO reaction process to produce high yield of cycloalkanes. Interestingly, the mass ratio between catalyst feed and raw PEEP was 1, thus 74.36% relative content (RC) of cycloalkanes can be obtained. The upgraded PEEP from CEOL has potential to be used as clean liquid fuels.
研究领域:
化学工程
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可再生能源
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催化科学
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DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
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2023
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IF 7.5
Yu Tang,Yi Cui,Gaosheng Ren,Ke Ma,Xiaoxun Ma,Chengyi Dai,Chunshan Song
In this study, the copper-mordenite zeolite (Cu-MOR) and non-thermal plasma were used to produce methanol and hydrogen from methane and water at low temperature (120 °C) without CO 2 formation. Energy efficiency for methanol and hydrogen were 68.8 mmol·kJ −1 and 562.3 mmol·kJ −1 , respectively, and the selectivity of methanol in liquid products reached 86%. The reaction mechanism likely involves methane being excited to methyl (·CH 3 ) and hydrogen radicals (·H) under DBD plasma conditions, which can then adsorb on the catalyst surface at the Cu 2 -(μ-O) 2+ active sites, accompanied by water co-adsorption to facilitate formation and desorption of methanol. XPS analysis showed that with the prolongation of reaction time, Cu 2 -(μ-O) 2+ was reduced to Cu + and Cu(II) hydroxide, and the catalyst had carbon deposition , resulting in the decrease of catalytic activity . It is also worth noting that in an oxygen atmosphere, Cu 2 -(μ-O) 2+ regenerates rapidly and eliminates catalyst carbon deposits . Trace oxygen was introduced into the reactor, and the reaction was carried out for 30 h, and the catalytic activity did not decrease.
研究领域:
化学工程
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催化科学
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Feng Chen,Xiao-Bo Feng,Jing-Ping Zhao,Zi-Meng He,Li-Yun Zhang,Yu-Hui Wang,Pan Deng,Xin-Hua Gao,Xiao-Yan Zhao,Jing-Pei Cao
Mordenite (MOR) zeolite is an efficient catalyst for dimethyl ether (DME) carbonylation, which a key step of indirect production of ethanol from syngas. Herein, a nanosheets MOR zeolite with an ultrathin thickness of 10–30 nm can be facilely synthesized by using a commercial cetyltrimethylammonium hydroxide agent. It greatly shortened the pore length of 8-membered ring (8-MR) side pocket and more amount of Brønsted acid sites (BAS) can be exposed. More importantly, the amount of BAS in 8-MR side pockets of the MOR zeolite can be significantly increased. It should be noted that the morphology of MOR zeolite with prismatic, nanosheets, and petal-like can be obtained and precisely regulated. As a result, the conversion of DME over the nanosheets MOR zeolite is increased by nearly 2 times. Our finding proposed a novel strategy for constructing tunable nanosized morphology MOR zeolite and simultaneously directional enrichment of BAS in 8-MR channels.
研究领域:
化学工程
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材料科学
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高影响因子
危险品化学品经营许可证（带存储）