ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Yafei Li,Shiqing Wang,Shunxin Fan,Babar Ali,Xiaocheng Lan,Tiefeng Wang
For the ethanolysis of biomass-derived furfuryl alcohol (FA) to value-added ethyl levulinate (EL), the development of an efficient solid acid catalyst is very important for industrial application with high FA concentration. Herein, a H-ZSM-5 catalyst with nano b-axis channels (NB-H-ZSM-5) was synthesized and used for the conversion of FA. Detailed catalyst characterization proved that the NB-H-ZSM-5 catalysts (Si/Al = 25∼125) with ∼70 nm b-axis channels were successfully prepared. The NB-H-ZSM-5 catalyst with Si/Al = 75 showed the highest activity. Its structural characteristics allowed for fast diffusion of reactants and products and full utilization of active sites, which endowed it with higher activity compared to commercial H-ZSM-5 (C-H-ZSM-5). Its moderate acidity effectively inhibited the polymerization of FA even at a high FA concentration of 20 wt %. The spent catalyst was easily regenerated by coke burn-off to give a good recyclability. Furthermore, based on the proposed reaction network, a method of physically mixing the NB-H-ZSM-5 (75) catalyst with a small amount of Amberlyst-15 was proposed to further increase the EL yield from 64.7 to 82.1% at an FA concentration of 6 wt %.
研究领域:
催化化学
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可再生资源化学
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材料科学
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DOI
高影响因子
CRYSTENGCOMM
·
2018
·Vol. 20
·期 40
·6319-6327
·
IF 3.304
Yu Shen,Zongzhuang Han,Hang Li,Haichao Li,Gang Wang,Fumin Wang,Xubin Zhang
Hierarchical ZSM-5 zeolite with short-range ordered mesoporosity and hierarchical ZSM-5 zeolite nanorods were obtained via a direct hydrothermal synthesis by the cooperative structure direction of dimethyloctadecyl[3-(trimethoxysilyl)propyl]- ammonium chloride (TPOAC) and tetrapropylammonium hydroxide (TPAOH). Dimethyloctadecyl[3-(dimethoxymethylsilyl)propyl]ammonium chloride (DPOAC) and octadecyltrimethylammonium chloride (OTAC) were also employed as structure directing agents (SDA) to further explore the role of methoxysilyl groups in organosilanes during the formation of hierarchical structure. The prepared materials were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), N2 adsorption–desorption, FT-IR, UV-vis and inductively coupled plasma-optical emission spectroscopy (ICP-OES). The characterization results showed that the use of TPOAC and DPOAC would generate short-range ordered mesopores and irregular mesopores, respectively. Hierarchical ZSM-5 zeolite nanorods with worm-like intracrystalline mesopores could be obtained by adjusting the amount of silicon source. The lack of methoxysilyl groups in OTAC however could lead to phase separation problems. Furthermore, the hierarchical Fe-ZSM-5 zeolite with short-range ordered mesoporosity showed enhanced catalytic activity and stability for the hydroxylation of phenol at room temperature.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2025
·
IF 7.2
Xu Yue,Sheng Wang,Shudong Wang
ZSM-5 zeolite adsorbents exhibit limited adsorption capacity for volatile organic compounds (VOCs) under high-humidity conditions, constraining their industrial applicability. In this study, a series of hierarchical ZSM-5 zeolites with high silica-to-alumina ratios (SARs) were successfully prepared via a facile acid pretreatment followed by surface methyl grafting. Using toluene as a representative VOC, the adsorption and desorption properties of these samples were assessed through dynamic adsorption breakthrough curves and temperature-programmed desorption (TPD) experiments. It was found that the two-step modification significantly enhanced both the breakthrough time and saturation adsorption capacity of high-SAR ZSM-5 for toluene in the presence of water vapor. AHFS-TZ5 and HCl-TZ5 exhibited superior performance, showing 53.9 % and 59.5 % enhancements in breakthrough time over ZSM-5, respectively. Specifically, the toluene adsorption capacity of AHFS-TZ5 under humid conditions (4 vol% H 2 O) reached 67.38 mg·g −1 , approximately 1.47 times higher than that of the unmodified ZSM-5. However, the hydrophobic -CH 3 groups grafted onto the ZSM-5 surface moderately hindered toluene diffusion due to increased steric hindrance. Additionally, AHFS-TZ5 exhibited excellent regeneration ability after desorption at 180 ºC, retaining 95 % of its initial adsorption capacity. This study provided a promising approach for preparing hydrophobic zeolites, offering a potential solution for efficient VOC adsorption in high-humidity flue gas environments.
研究领域:
环境科学
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材料化学
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吸附分离
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大气污染控制
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多孔材料
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Xuemin Cao,Kun Zhang,Yu Wang,Peng He
The carbonylation of formaldehyde offers a promising, cost-effective, and environmentally friendly method for synthesizing glycolic acid, a crucial monomer in biodegradable plastics. This study highlights the development and optimization of a bifunctional PdO/ZSM-5 zeolite catalyst for this process. Investigations via various spectroscopic techniques reveal that Pd species, predominantly in the form of PdO, enhance the CO activation, thereby boosting the formaldehyde carbonylation reaction rate significantly. The optimal catalytic performance was observed with a Pd-loading of 2 wt %. Notably, excessive Pd loading was found to impede the catalytic performance by overoccupying acid sites, thereby reducing its capacity to activate formaldehyde. The concurrent activation of formaldehyde and CO at the Brønsted acid site and the PdO site, respectively, through a Langmuir–Hinshelwood mechanism is key to the enhanced catalytic performance. These findings underscore the importance of CO activation in improving the formaldehyde carbonylation process, offering vital insights for catalyst optimization.
研究领域:
催化化学
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化学合成
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环境化学
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高分子科学
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DOI
高影响因子
CATALYSIS LETTERS
·
2025
·Vol. 155
·期 5
·1-14
·
IF 2.4
Yao Wenjie,Chen Lei,Wang Yinzhong,Yang Gang
The composite molecular sieve catalysts with long reaction times were successfully synthesized by introducing Cu 2+ /Mn 2+ and ZSM-5 into the initial gel. The catalysts were characterized with XRD, SEM and NH 3 -TPD, and further investigated through the methanol-to-olefin reactions. The results showed that the addition of Cu 2+ caused the crystallinity of ZSM-5/SAPO-34 (Z-S) to increase significantly, but with addition of Mn 2+ , the crystallinity gradually decreased. With the increase of the Mn 2+ /Cu 2+ ratio, the desorption summits of the weak and strong acid sites gradually increased, but the weak acid centres gradually dominated, which is herein thought helped reducing formation of the coke. The designed Cu 0.05 -Mn 0.05 /Z-S samples showed beneficial catalytic performances with a lifetime of 1500 min, a 1.5-fold increase compared with the Cu 0.05 /Z-S, while their selectivities remained exceeding 89%. Graphical
研究领域:
化学工程
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催化材料
✓ 已验证
产品关联
DOI
高影响因子
Petroleum Science
·
2025
·
IF 6.1
Chuan-Hao Zhang,Qi Dong,Fei Wang,Ning-Yue Lu,Feng Yu,Bin-Bin Fan,Rui-Feng Li
Deep hydrogenation of polycyclic aromatic hydrocarbons (PAHs) into jet fuel is an important strategy for the upgrading of light cycle oil (LCO). Zeolite-supported metal catalysts have exhibited good catalytic performance for hydrogenation of PAHs under relatively mild conditions. However, the impacts of acidity variations in zeolite supports, arising from the differences in framework Al (Al F ) distribution on the catalytic behavior of zeolite-supported metal catalysts in the deep hydrogenation of PAHs remains unclear. Herein, two series of mesoporous ZSM-5 samples, that is ZSM-5-E- x and ZSM-5-F- x , with the differences in Al F distribution but similar Si/Al ratios, were prepared in the crystallization system with or without NaOH. The results of NH 3 -TPD, Pyridine-IR, N 2 adsorption-desorption and SEM reveal that two series of HZSM-5 samples have similar acid density and acid strength, textural properties, morphology and particle size. However, the results of XPS, 27 Al MAS NMR, 2,6-Ditert-butylpyridine-IR, catalytic cracking of 1,3,5-triisopropylbenzene and the controlled reactions as well as DFT calculation indicate that the higher enrichment degree of Al F on the external surface and the suitable arrangement mode of Al F in ten-membered ring (10-MR) of HZSM-5-F- x compared to HZSM-5-E- x in case of the similar Si/Al ratios, result in Pt/HZSM-5-F- x exhibiting remarkably-improved deep hydrogenation performance of phenanthrene (PHE) compared to Pt/HZSM-5-E- x . Particularly, the selectivity to perhydrophenanthrene (PHP) over Pt/HZSM-5-F-50 can reach above 99.0% at a conversion of PHE (>99.0%). Furthermore, Pt/HZSM-5-F-50 exhibits well reusability. This work helps to clarify the impact of Al F distribution in ZSM-5 on catalytic hydrogenation performance for PAHs, providing valuable guidance for design and development of efficient catalysts for the hydrogenation of PAHs.
研究领域:
催化化学
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石油炼制
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材料化学
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表面科学
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工业催化
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产品关联
DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2025
·
IF 1.6
Shuai Yan,Xin Pu,Zhiyong Qi,Xiaoran Zhang,Xiaoyu Zhou,Xin Han,Lei Ye,Xinglong Qin,Jichang Liu
m -Cresol and p -cresol cannot be effectively separated using conventional distillation because of their proximate boiling temperatures. This study investigated the adsorption separation of cresol using the short b -axis ZSM-5 synthesized via a urea-assisted method. In contrast to the ellipsoidal HZSM-5, which was approximately 1 μm in length, the thickness of the sheet-like HZSM-5 decreased to 36 nm, resulting in an increase in total cresol adsorption capacity from 76 to 122 mg/g. Applying the CLD method, an increase in the TEOS:HZSM-5 ratio from 0 to 0.83 resulted in the increase in p -cresol adsorption capacity from 69 to 106 mg/g, while m -cresol adsorption capacity dropped from 53 to 12 mg/g. The adsorption selectivity significantly rose from 1.3 to 9.7. The adsorption kinetics and isotherms demonstrated that the process was exothermic for p -cresol and endothermic for m -cresol.
研究领域:
材料化学
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物理化学
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分离科学
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催化化学
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纳米材料
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Shenghui Xia,Chen Chen,Jinhong Liu,Yu Zhang,Hui Zhang,Thomas Thundat,Ajit Khosla
Nitrogen dioxide (NO 2 ) is a highly toxic air pollutant that endangers human health, environmental sustainability, and ecosystems. To address this issue, we designed an inorganic heterogeneous interface by integrating ZSM-5 molecular sieves with MXene via a facile synthesis route. This unique architecture synergizes the dual cross-channel framework of ZSM-5 and the high electrical conductivity and abundant surface functional groups of MXene. This combination greatly enhances electron transfer kinetics, interfacial NO 2 adsorption, and gas sensing properties. The optimized MXene/ZSM-5 nanocomposite achieves an ultra-low NO 2 detection limit of 1 ppm. Its response is 79.78 % higher than that of original MXene. The nanocomposite also exhibits excellent stability and significant anti-interference properties. Correlation studies confirm consistent performance across humidity and atmospheric conditions. Density functional theory (DFT) calculations elucidated the charge transfer pathways and adsorption mechanisms at the atomic level that enhance sensitivity. By pioneering the MXene/ZSM-5 interface and systematically investigating its gas interaction kinetics, this work provides fundamental insights for designing next-generation MXene-based gas sensors.
研究领域:
材料科学
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纳米科技
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传感技术
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环境化学
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表面科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Li Cui,Yimin Wang,Zhen Yuan,Xiaoli Zhang,Yuewen Chen,Xiya Zhang,Yihu Ke,Zhile Xiong,Hai Liu
Oxidizing glycerol (the primary by-product of biodiesel production) into 1,3-dihydroxyacetone (DHA) can significantly boost the economic feasibility of the biodiesel industry, but the catalyst deactivation remains a significant challenge. Herein, we present a novel approach that achieves a breakthrough in the conversion of glycerol to DHA through the integration of porous zeolite platform (bio-ZSM-5), derived from corn straw templates, with the traditional Au/CuO catalyst via mechanical milling. Under alkali-free conditions, the synthesized Au/CuO@bio-ZSM-5 catalyst exhibits remarkable glycerol conversion rate of 97.3% and DHA selectivity of 92.2%. Notably, the catalyst retains its efficacy with a glycerol conversion of 89.7% and DHA selectivity of 90.3% even after three regeneration cycles, surpassing all previously documented catalysts for this specific reaction. Serial characterizations and density-functional theory (DFT) calculations reveal that the incorporation of bio-ZSM-5 can modify the electronic structure of surface Au, reduce the adsorption energy of glycerol, and elevate the reduction temperature. This work is expected to provide an effective perspective for the design of catalysts with high cyclic stability.
研究领域:
化学工程
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材料科学
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催化反应
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Dongyang Liu,Yuen Bai,Dongdong Chen,Nan Zhang,Liang Zhao,Jinsen Gao,Chunming Xu
This study investigates the co-cracking of n-hexane and 1-hexene, utilizing 1-hexene as an olefinic initiator to improve light olefin yields. Experimental investigations, kinetic analyses, and density functional theory calculations (DFT) were used to systematically explore cracking performance, interactions, and mechanisms for co-feeding. Comparied with single feeding of n-hexane, leading to higher light olefin yields (increased from 35.77 wt% to 58.61 wt%) when the olefin content is 20 wt%. Kinetic analysis revealed a shift from protolytic to hydrogen transfer cracking pathway when 1-hexene content exceeded 13.6 wt%, with the maximum cracking rate (13.12 h −1 ) constant at 20 wt% olefin content. DFT calculations showed a lower energy barrier for hydrogen transfer cracking between n-hexane and 1-hexene, compared to n-hexane cracking alone. Therefore, a co-cracking mechanism was proposed, involving paraffin activation through carbocation intermediates generated by olefin, followed by β-cracking to generated light olefins and carbenium ion regeneration, establishing a framework for paraffin-olefin co-conversion.
研究领域:
催化化学
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石油炼制
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反应动力学
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理论化学
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材料化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Xu Duan,Jian Yang,Guang Hu,Chen Yang,Yangfan Chen,Qingcai Liu,Shan Ren,Jiangling Li
In this work, based on a type of energy band engineering strategy as calcination , TiO 2 /ZSM-5 hybrids for photodegradation of methyl orange (MO) in water under UV light have been developed via a facile solid state diffusion method. Effects of varied calcination temperatures on TiO 2 /ZSM-5 hybrids have been systematically characterized including XRD , FT-IR, SEM, TEM , EDX mapping, BET, PL , EIS , UV–vis DRS, active species trapping experiments and Mott-Schottky curves. It was found that the calcination temperature influenced photocatalytic activity , typically on physicochemical properties of materials and adjustment for the energy gap and band position of TiO 2 . The XRD analysis revealed that hybridization of ZSM-5 kept the crystal phase of TiO 2 as anatase unchanged with the high-rising calcined temperature. The optimum sample calcined at 450 °C named as Z-T (450) presented nearly 99% degradation rate for MO, owing to optimal uniform distribution, highest specific surface area and best charge separation/transfer efficiency. The FT-IR comparison result that the functional groups and peak strength of the used catalyst were alike as before, showed the stability of photocatalyst . Adoption of calcination strategy does provide not only a clean, low-cost and highly efficient path to approach the complete degradation of azo dyes , but also a chance for photocatalytic technology to fulfill the implementation in industrial applications.
研究领域:
材料科学
·
环境化学
·
物理化学
·
催化化学
·
纳米材料
·
光催化技术
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2017
·Vol. 11
·期 4
·564-574
·
IF 1.712
Song Baodong,Li Yongqiang,Cao Gang,Sun Zhenhai,Han Xu
In the transformation of methanol to gasoline (MTG), the selectivity to gasoline and the aromatic content in the produced gasoline are important factors. The catalytic activities of steam-treated and non-steam-treated nano-scale H-ZSM-5 (NHZ5) catalysts impregnated with Ag(I), Zn(II) or P(V) have been investigated in a continuous flow fixed bed reactor. The NH 3 -TPD results showed that after impregnation, the Ag/NHZ5, Zn/NHZ5 and P/NHZ5 catalysts contained comparatively more strong, medium-strong and weak acid sites, respectively. Treatment with steam decreased the number of acid sites in all the catalysts, but the pore volumes in the catalysts were larger which improved carbon deposition resistance resulting in prolonged lifetimes. After 6 h of MTG reaction, the selectivity to gasoline for the steam-treated catalysts,
\(Ag_{H_2 O} /NHZ5\) , \(Zn_{H_2 O} /NHZ5\) and \(P_{H_2 O} /NHZ5\) were 70.5, 68.4 and 68.7 wt-%, respectively, whereas their respective aromatic contents in the produced gasoline were 61.9, 55.4 and 39.0 wt-%. Thus \(P_{H_2 O} /NHZ5\) is the most promising catalyst for MTG applications which can meet the China IV gasoline standard that the amount of aromatics in gasoline should be less than 48 wt-%.
研究领域:
催化化学
·
能源化工
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材料科学
·
表面科学
·
石油炼制
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）