Catalysts
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2023
·Vol. 13
·期 5
·868
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IF 3.9
Jun-Cai Hao,Rui-Xin Zhang,Miao Ren,Jia-Xuan Zhao,Zhi-Hua Gao,Lei Liu,Zhu-Xia Zhang,Zhi-Jun Zuo
Copper-based zeolite catalysts are widely used in methanol synthesis from methane oxidation, but their photothermal catalytic properties have seldom been explored. This study examines the effect of the preparation method on Cu-based zeolite composite graphite-phase carbon nitride catalysts (Cu-MOR/g-C3N4) for direct methanol synthesis from methane oxidation by photothermal catalysis. Four different preparation methods are employed: liquid phase ion exchange (Cu-MOR/g-C3N4-IE), isovolumetric impregnation (Cu-MOR/g-C3N4-IM), solid-state ion exchange (Cu-MOR/g-C3N4-GR), and hydrothermal synthesis (Cu-MOR/g-C3N4-HT). Cu-MOR/g-C3N4-IE shows the highest methanol yield (3.09 μmol h−1gcat−1) due to strong interactions between the CuxOyspecies and g-C3N4, as well as smaller interfacial charge transfer forces. This study provides a new method for the design and synthesis of catalysts for the conversion of methane.Keywords:Cu-MOR/g-C3N4;methane;methanol;photothermal catalysis;preparation method
研究领域:
催化化学
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能源化学
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材料科学
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DOI
高影响因子
Molecular Catalysis
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2018
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IF 0
Peipei Tao,Xinhuan Lu,Haifu Zhang,Run Jing,Fengfeng Huang,Sha Wu,Dan Zhou,Qinghua Xia
CoO x species is firstly introduced onto MOR (Mordenite) by impregnation with microwave heating to catalyze the epoxidation of α-pinene with air. The obtained samples have been characterized by X-ray diffraction, FTIR, SEM, TEM, BET surface area, porosity by N 2 adsorption. 7%CoO x /MOR catalyst exhibits remarkably higher activity and selectivity in the epoxidation of α-pinene than that prepared by traditional heating impregnation. The epoxidation conversion of α-pinene over 7%CoO x /MOR prepared by microwave heating reaches 92.7 mol% in 4 h at 90 °C, which is nearly 1.5 times that of the catalyst by traditional impregnation. This is due to the fact that CoO x nanoparticles are produced by microwave heating and uniformly dispersed on MOR.
研究领域:
催化化学
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材料科学
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DOI
APPLIED ORGANOMETALLIC CHEMISTRY
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2020
·Vol. 34
·期 11
·e5925
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IF 3.14
Jie Yao,Yan Wang,Suleiman Sabo Bello,Guangwen Xu,Lei Shi
As it is well known, Brønsted acid sites in 8-MR of H-MOR (mordenite) are selective for dimethyl ether (DME) carbonylation to methyl acetate, whereas those in 12-MR are more prone to methanol to olefin reaction. Interestingly, we observed that the Brønsted acid sites in 12-MR of H-MOR are highly active for dimethoxymethane (DMM) carbonylation to methyl methoxyacetate (MMAc), whereas those in 8-MR led to the formation of DME. A series of modified H-MOR catalysts with accurate regulation of Brønsted acid sites in 12-MR or 8-MR were successfully synthesized by selective Na + exchange or pyridine (Py) adsorption. Fourier-transform infrared (FT-IR) spectra, NH 3 -temperature-programmed desorption, Py-FT-IR, and inductively coupled plasma analyses suggested that Na + first occupied Brønsted acid sites in 8-MR and then replaced those in 12-MR. All Na + -exchanged catalysts exhibited significant acceleration on MMAc selectivity, and the ratio of Brønsted acid amount in 12-MR/total had a positive correlation with MMAc selectivity. The MMAc selectivity (78%) of H-MOR-0.15Na was nearly 2.5 times more than that of untreated H-MOR (31%). However, H-MOR-Py showed almost no carbonylation activity (<1% MMAc) and a highest DME selectivity (98%), indicating that Brønsted acid sites in 12-MR were the only active sites for DMM carbonylation, whereas those in 8-MR tended to accelerate DMM disproportionation to DME.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
RSC Advances
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2014
·Vol. 4
·期 24
·12160-12167
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IF 3.708
Zhang-Min Li,Yan Zhou,Duan-Jian Tao,Wei Huang,Xiang-Shu Chen,Zhen Yang
In order to widen the application of ionic liquids as efficient and renewable heterogeneous catalysts, supported ionic liquids (SILs) have received considerable attention. A novel heterogeneous catalyst MOR zeolite supported Brønsted acidic ionic liquid (BAIL@MOR) was therefore prepared, characterized and applied in the ketalization reaction. The influences of reaction temperature, time, and catalyst loading have also been investigated in detail. Combined characterization results of XRD, FT-IR, SEM, TG-DTG and N2 adsorption–desorption suggested that the BAIL [CPES-BSIM][HSO4] was successfully immobilized on the surface of MOR zeolite by covalent bonds. Moreover, the catalytic performance tests demonstrated that the catalyst BAIL@MOR exhibited excellent catalytic activities in the ketalization of cyclohexanone with glycol, 1,2-propylene glycol and 1,3-butylene glycol under mild reaction conditions, as comparable with the homogeneous catalysis of the precursors [BSmim][HSO4] and H2SO4. In addition, the catalyst BAIL@MOR was also found to be reusable five times without a significant loss of its catalytic activity. Thus, the heterogeneous catalyst BAIL@MOR can act as a promising candidate for the ketalization reaction.
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 ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Xiaomin Lang,Juan Huang,Mochou Zhang,Zitao Liu,Chunmei Li,Jianfeng Tang,Qing Li,Hua Lin
Building Mott-Schottky heterojunctions can effectively enhance the activity of catalysts, but it faces challenges such as energy band matching, interface contact quality, and charge transfer efficiency. This study utilizes Ni 3 S 2 as a self-supporting template to construct CoFeLDH/Ni 3 S 2 /NF with a Mott-Schottky heterojunction, which exhibits excellent bifunctional catalytic activity and stability, achieving overpotentials of 227 mV and 107 mV for 10 mA cm -2 in OER and MOR, respectively. The research indicates that the robust Mott-Schottky interaction established between the metallic Ni 3 S 2 and the semiconductor CoFeLDH promotes spontaneous electron transfer and regulates the adsorption/desorption of intermediates; the Ni 3 S 2 nanosheet array morphology provides a low-resistance pathway for charge and mass transfer, while the small nanosheets of CoFeLDH combined with Ni 3 S 2 enhance the exposure of active sites, further increasing the reaction rate. This strategy can be extended to other semiconductor materials, as demonstrated by the constructed NiFeLDH/Ni 3 S 2 /NF and NiCoLDH/Ni 3 S 2 /NF, which also exhibit good catalytic performance. This study proposes a universal method for constructing efficient Mott-Schottky electrocatalysts, highlighting their practical application potential.
研究领域:
材料科学
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电化学
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催化科学
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DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
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2022
·Vol. 48
·期 11
·4517-4536
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IF 3.134
Yang Zizhen,Wang Siya,Chen Ou,Wang Zhengwei,Xu Jundong,Zheng Shuqin
In this paper, FeMn-ZSM-5/MOR(FeMn-Z/M) catalyst was synthesized through in-situ crystallization and wet impregnation method and used as heterogeneous Fenton-like catalyst for degradation of indigo carmine (IC) in aqueous solution. The catalysts were characterized using XRD, BET, SEM, EDS, FT-IR and XPS techniques. The experimental results showed that Fe and Mn were successfully doped onto the ZSM-5/MOR(Z/M) surface. The combination of ZSM-5 and mordenite (MOR) not only enhanced the adsorption capacity of contaminant, but also had more active sites. Degradation experiments and the valence variations indicated that Fe and Mn had a significant synergistic effect. The results of IC degradation experiments under different conditions showed that the optimum conditions (FeMn mass ratio = 1:2, FeMn-Z/M = 25 mg, H 2 O 2 = 0.5 ml, pH = 3), the degradation rate of IC reaches 99% in 20 min. Reaction analyses showed that catalyst follow a first-order reaction kinetic. The degradation of IC could be divided into two stages: adsorption/oxidation (After adsorption, oxidative degradation begins) and Fenton-like reaction. Free radicals quenching studies analyzed verified that the dominant free radicals within FeMn-Z/M Fenton-like system were hydroxyl radical (·HO) and hydro-peroxy radical (·HO 2 ), ·HO 2 was the main free radical in the adsorption/oxidation stage. The possible catalytic mechanism was proposed. Finally, the synthesized FeMn-Z/M catalyst had better performance than other IC removal methods, and had good degradation efficiency and high reusability after multiple runs.
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Hao Wang,Libin Ji,Liang Li,Xiaorong Guo,Haitao Li,Yin Zhang,Jun Ren,Chenghua Zhang,Yongxiang Zhao
The hydrogenation of maleic anhydride (MA) to succinic anhydride (SA) is a highly selectivity-sensitive reaction, significantly influenced by catalyst activity and temperature. Excessive hydrogenation often leads to the formation of other byproducts and the decreasing of SA selectivity. A key industrial challenge lies in achieving both high MA conversion and SA selectivity under industrial operating conditions. In this paper, a confined metal Ni catalyst anchored on mordenite (MOR) zeolite was prepared by a simple and low-cost method, and its acidity was regulated by alkali metal ion. The results show that compared with SiO 2 and Al 2 O 3 as supports, the Ni/MOR catalyst achieves an excellent MA conversion of about 100 %, and a remarkable SA selectivity up to 99 %. Meanwhile, the stability of the Ni/MOR catalyst has been significantly improved. With the similar conversion rate of MA, the reaction cycle numbers of Ni/MOR are twice that of the traditional Ni/SiO 2 catalyst. This is attributed to the confinement effect of the MOR channels, which slightly reduces the activity of the metal and then effectively inhibits the over‑hydrogenation process of SA. In addition, a combination of theoretical calculation and experimental characterization was used to deeply study the reaction mechanism of high-selective hydrogenation of MA to SA.
研究领域:
催化化学
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化学反应工程
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工业化学
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材料科学
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物理化学
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2024
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IF 4.8
Yuxia Li,Tingting Ge,Yuchao Li,Yanxia Zheng,Xiaobin Wang,Hui Guo,Zehao Jing,Jian Song,Xinpeng Guo,Ming Wang,Haofei Huang,Cuncun Zuo,Liping Zhang
High-performance MOR zeolite membranes were prepared by loading hydrophilic metal oxides onto the surface of α-Al 2 O 3 support via secondary hydrothermal synthesis method. The effects on the surface morphology and hydrophilicity of MOR zeolite membranes were discussed by means of different metal oxides (TiO 2 , V 2 O 5 , CeO 2 , ZrO 2 , WO 3 ) and loadings in combination with SEM, XRD, Raman and Water Contact Angle (WCA) characterization. TiO 2 -MOR zeolite composite membranes were found that TiO 2 could increase interface hydrophilicity. The pervaporation performances of TiO 2 -MOR zeolite membranes at different temperatures and feed concentrations were investigated. The mass transfer model combining Maxwell-Stefan mechanism, Kundsen diffusion and viscous flow was used to describe the mass transfer process of water molecules through the zeolite layer, and within the α-Al 2 O 3 scaffolds, respectively. The permeation fluxes of water molecules of TiO 2 -MOR zeolite membranes with the loading of 2 wt% were 0.91 kg m −2 h −1 , 1.00 kg m −2 h −1 and the separation factors were up to 10000 at 348 K with 90 wt% AcOH/H 2 O and 90 wt% AA/H 2 O solutions. TiO 2 -MOR zeolite membranes with well acid resistance and high hydrophilicity had promising prospects in the reaction scene where carboxylic acid and water exist simultaneously, such as esterification, ester hydrolysis, acetic acid aldol condensation, etc.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
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2024
·Vol. 50
·期 7
·3033-3052
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IF 2.8
Huang Guihua,Yang Zizhen,Li Sijia,Wang Zhengwei,Xu Jundong,Zheng Shuqin
In-situ crystallization was used to prepare the composite molecular sieve ZSM-5/MOR (Z/M) successfully, and FeLa-ZSM-5/MOR (FeLa-Z/M) was obtained by loading Fe and La on the surface of the composite molecular sieve by hydrothermal method. The composite molecular sieve combined the water absorption of mordenite (MOR) and the mass transfer performance of ZSM-5, and effectively improved the surface area and porous structure. This zeolite improved the dispersion performance of active sites in Z/M and reduced mutual aggregation between particles, which was conducive to catalytic efficiency. The addition of La increases the number of oxygen vacancies, according to XRD, TEM, XPS, UV-DRS, and other data analyses. Because doping of La stretched the Fe–O bond, reduced the oxygen vacancies’ formation energy, and promoted oxygen vacancies’ formation, which was an essential reason for Fe 3+ reduction and Fe 3 O 4 formation. The addition of La also had a highly dispersed effect on Fe. Under the optimal conditions, with a FeLa mass ratio of 1:1, FeLa-Z/M at 25 mg, H 2 O 2 at 0.5 ml, and a pH of 3, the degradation rate of IC was found to be 97.8% and 99.5% in 5 min and 10 min respectively. Analysis of the reaction indicated that the catalyst followed a first-order reaction kinetic. Free radical quenching experiments confirmed that the main free radicals in the FeLa-Z/M Fenton-like system were hydroxyl radicals (·OH), suggesting a possible catalytic mechanism. Furthermore, the synthesized FeLa-Z/M catalyst exhibited superior performance compared to other methods of IC removal, demonstrating high reusability and efficient degradation even after multiple uses. Graphical abstract
研究领域:
环境科学
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材料科学
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催化化学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2016
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IF 7.145
Wei Zhang,Jingyan Xie,Wei Hou,Yangqing Liu,Yu Zhou,Jun Wang
Supported catalysts are widely studied, and exploring new promising supports is significant to access more applications. In this work, novel copper-containing MOR-type zeolites Cu–MOR were synthesized in a one-pot template-free route and served as efficient supports for vanadium oxide. In the heterogeneous oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran (DFF) with molecular oxygen (O2) under ambient pressure, the obtained catalyst demonstrated high yield (91.5%) and good reusability. Even under the ambient air pressure, it gave a DFF yield of 72.1%. Structure–activity relationship analysis indicated that the strong interaction between the framework Cu species and the guest V sites accounted for the remarkable performance. This work reveals that the Cu–MOR zeolite uniquely acts as the robust support toward well-performed non-noble metal heterogeneous catalyst for biomass conversion.
研究领域:
化学工程
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材料科学
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催化反应
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Management and Organization Review
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2023
·Vol. 19
·期 1
·98-137
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IF 2.9
Guoguang Wan,Heli Wang,Xuesong Geng,Kenneth G. Huang
This study examines Chinese corporations’ responses to a sudden natural disaster in terms of their philanthropic donations. We apply Polanyi's double movement perspective to argue that rapid market expansion in an emerging economy causes social problems such as large-income disparities and environmental degradation. This calls forth counterforces advocating social responsibility and sustainability. Such countermovements can be strengthened by a major disaster, especially in the domain of corporate philanthropy. The resulting increase in corporate philanthropy persists long after the disaster, especially for those firms with large intra-firm pay disparities, operating in socially contested industries and located in regions with more social foundations. Using the context of China's 2008 Wenchuan earthquake, we find support for these arguments in a sample of Chinese public firms.
本文研究中国公司对于突发自然灾害的捐款行为。我们采用Polanyi的双向运动视角来阐释该现象。双向运动视角认为新兴经济体市场的迅速扩张会带来贫富悬殊和环境破坏等社会问题，同时这些问题会反过来推动大家支持社会责任和可持续发展。这些反向推动在一场大灾难面前会得到加强，尤其反映在公司捐款行为上。灾后公司捐款的增加会在灾难结束后长时间持续，特别是具有以下特点的公司：公司内部工资差异较大、公司所在行业具有社会争议，公司总部所在地的慈善基金会比较多。本文，发现基于中国上市公司样本在中国2008年汶川地震情境下的捐款数据支持了这些论述。
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Faisal Irshad,Dan Zhang,Hamzah A.S.M. Yaseen,Xianming Zhu,Muhammad Chawla,Shengping Wang,Yongli Shen,Xinbin Ma
Pd/H-MOR exhibits superior catalytic activity and stability for CO 2 hydrogenation to formateover other Pd/Zeolites and M/H-MOR. • Brønsted acid sites at Pd-H-MOR interface polarize CO 2 , while highly dispersed Pd nanoparticles dissociate H 2 barrierlessly. • Low Si/Al ratio optimizes metal-support synergy and reducing apparent activation energy to HCOOH. • Bicarbonate identified as the key reaction intermediates by in-situ DRIFTS and DFT study. Catalytic hydrogenation is a promising route for CO 2 conversion, yet the highly efficient formation of formic acid remains challenging. Herein, Pd nanoparticles dispersed on mordenite (Pd/H-MOR) are reported as an efficient and stable catalyst for CO 2 hydrogenation to produce formates. Under optimized conditions, Pd/H-MOR achieved an intrinsic turnover number of 1828 and a turnover frequency of 914 h −1 at 120 °C, surpassing all the other prepared catalysts with different metal active sites and zeolite supports. The high activity arises from the co-effect of Pd and the H-MOR support: Pd sites dissociate H 2 into active hydrogen, while Brønsted acid sites enhance CO 2 adsorption via polarization and stabilize bicarbonate intermediates, which subsequently convert to formates. Density functional theory (DFT) results revealed that Pd/H-MOR lowers the activation barriers for both H 2 dissociation and CO 2 activation at the Pd-MOR interface and combined with in-situ DRIFTS, identifying surface bicarbonates as the key reactive intermediates en-route to formate formation. Comparatively, kinetic studies of Pd/H-MOR revealed a reduced apparent activation energy of 15.81 ± 0.79 kJmol −1 , reflecting strong metal-support interactions, while the observed R = k ∙ P CO 2 0.56 ∙ P H 2 0.62 reaction orders indicate that the reaction rate is weakly dependent of H 2 and CO 2 pressures but strongly dependent on the nature of the metal and the zeolite support. This work highlights metal dispersion and support acidity as key factors for CO 2 hydrogenation. Download: Download high-res image (224KB) Download: Download full-size image
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高影响因子
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