CHEMICAL ENGINEERING SCIENCE
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2023
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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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DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 4
·854
·
IF 3.1
Peixuan Lin,Song Ye,Ling Pan,Ruihao Huang,Haoran Zhang,Deping Wang
In this research, upconversion nanocrystals incorporated with MOR zeolite composites were synthesized using the desilicated MOR zeolite as a host for the in situ growth of NaREF4(RE = Y, Gd) Yb/Er nanocrystals. The structure and morphology of the composites were studied with XRD, XPS, and TEM measurements, and the spectral studies indicated that the subsequent thermal treatment can effectively improve the upconversion emission intensity of Er3+. By using the NaYF4:Yb/[email protected]composite that holds the strongest upconversion emission, a probe of UCNC@DSiMOR/BPEI was constructed with the modification of branched poly ethylenimine for the detection of Cu2+. It was indicated that the integrated emission intensity of Er3+shows a linear dependence with the logarithm value of the Cu2+concentration ranging from 0.1 to 10 μM. This study offered a feasible method for the construction of UCNC@zeolite composites with enhanced upconversion emission, which may have a potential application as fluorescent probes for the detection of various metal ions by adjusting the doping luminescent center.
研究领域:
材料科学
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分析化学
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产品关联
DOI
PubMed
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
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DOI
PubMed
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
·
催化材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
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
·
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
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