CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Wen-Hui Hu,Meng-Nan Liu,Qun-Xing Luo,Jianbo Zhang,Huiyong Chen,Long Xu,Ming Sun,Xiaoxun Ma,Qing-Qing Hao
Numerous efforts have been dedicated to develop solid acid catalysts with higher activity and stability replacing the homogeneous catalysis for Friedel-Crafts (FC) acylation reaction. In this study, single- to multiple-layer MWW zeolites are employed as well-defined model catalysts to investigate the influencing mechanism of microscale structure of MWW zeolites on the kinetics for acylation of anisole with acetic anhydride. It is found that the acylation of anisole is solely carried out on the external acid sites of MWW zeolites and follows Langmuir-Hinshelwood mechanism. The single-layer MWW (SL-MWW) with more external acid sites exhibits lower catalytic activity for acylation of anisole in batch reaction, whereas the recycle stability of SL-MWW is clearly higher than that of multiple-layer MWW (ML-MWW). Kinetics results reveal that a large equilibrium constant of product adsorption together with the confinement effect within 12MR pockets on surface of SL-MWW results in difficult desorption of product and small rate constant. Therefore, the favorable mass-transfer and diffusion of SL-MWW is restrained in batch reaction and at low temperature condition. Based on these findings, the continuous flow fixed-bed process under an elevated temperature (493 K) was conducted to underline the structural advantages of SL-MWW zeolite. The lifetime of SL-MWW can reach to 300 h in the optimal reaction conditions, which is potential catalyst for industrial application in the field of FC acylation reactions.
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
Frontiers of Chemical Science and Engineering
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2019
·Vol. 14
·期 4
·546-560
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IF 2.809
Wang Hanlu,Jibrin Idris,Zeng Xingye
Catalysts for the desulfurization of gasoline samples were synthesized via the immobilization of well-dispersed phosphotungstic acid (HPW) on Mobil composition of matter-twenty-two (MWW) zeolite. Characterization results indicated that these catalysts possess a mesoporous structure with the retention of the Keggin structure of immobilized HPW. Relevant reaction parameters influencing sulfur removal were systematically investigated, including HPW loading, catalyst dosage, temperature, initial S-concentration, molar ratio of oxidant to sulfide (O/S), volume ratio of MeCN to model oil (Ext./oil), and sulfide species. The 40 wt-% HPW/MWW catalyst exhibited the highest catalytic activity with 99.6% dibenzothiophene sulfur removal from prepared samples. The 40 wt-% HPW/MWW catalyst was recycled four times and could be easily regenerated. Finally, as an exploratory study, straight-run-gasoline and fluid catalytic cracking gasoline were employed to accurately evaluate the desulfurization performance of 40 wt-% HPW/MWW. Our research provides new insights into the development and application of catalysts for desulfurization of gasoline.
研究领域:
化学工程
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催化材料
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环境科学
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DOI
高影响因子
JOURNAL OF CATALYSIS
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2025
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IF 6.5
Yuexia Wang,Jiaqi Xu,Xuan Lin,Chaosi Liu,Xinqing Lu,Yijing Gao,Francesco Pepe,Domenico Caputo,Weidong Zhu
Ti-MWW zeotypes, characterized by their unique dual pore architecture consisting of intralayer 10-membered ring (MR) pore channels and additional interlayer 10-MR pore channels that are interconnected to intracrystalline 12-MR supercages, exhibit a remarkably catalytic superiority in the selective oxidation of small and/or linear alkenes with hydrogen peroxide (H 2 O 2 ), surpassing other titanosilicate zeotypes in performance. However, a further improvement on their catalytic performance is still needed for the industrialization of alkene epoxidation over Ti-MWW. In the present work, the introduction of NH 4 + species into Ti-MWW was conducted via a facile but effective treatment of the as-synthesized zeotypes with NH 4 Cl, named N-Ti-MWW. The comprehensive characterization of N-Ti-MWW, derived from NH 4 + -exchanged Ti-MWW, coupled with Density Functional Theory (DFT) calculations, conclusively demonstrates that the integration of NH 4 + into Ti-MWW promotes the generation of -Ti-OOH hydroperoxo intermediates, resulting in a higher catalytic activity in alkene epoxidation in comparison to the parent one. Moreover, the solvolysis of epoxides is significantly suppressed on N-Ti-MWW, enabling the catalyst to display a superior selectivity towards the targeted epoxide, thereby improving its overall catalytic performance. Additionally, N-Ti-MWW is reusable, after the regeneration of the deactivated catalyst simply treated with NH 4 Cl. As a result, it is anticipated that N-Ti-MWW would be applicable in the industrial epoxidation of alkenes with H 2 O 2 .
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2021
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IF 5.455
Kang Tang,Weilong Hou,Xiaoshu Wang,Wen Xu,Xinqing Lu,Rui Ma,Yanghe Fu,Weidong Zhu
The titanosilicate zeolite catalyzed epoxidation of propylene with hydrogen peroxide (H 2 O 2 , HP) to propylene oxide (PO), the so-called HPPO, is more eco-efficient, compared to the chlorohydrin process and the epoxidation using organic hydroperoxides. However, the zeolite catalysts used in the HPPO process are easily deactivated, because the main byproduct propylene glycol (PG) and other heavy byproducts with high boiling points, derived from the solvolysis of PO, are deposited inside the zeolite micropores. In the present work, trimethylsilylated Ti-MWW zeolites, named Si–Ti-MWW, were developed for the HPPO process. In combination with the results from extensive characterizations for the prepared zeolites, it is found that the trimethylsilylation merely occurs on the external surface of Ti-MWW crystals and can significantly enhance the hydrophobicity , but not alter the coordination states of the Ti species and textural properties of the zeolites. The catalytic properties of Ti-MWW and Si–Ti-MWW were compared in propylene epoxidation. The results show that the solvolysis of PO to the byproducts can be effectively inhibited over the hydrophobic zeolite surface, making Si–Ti-MWW exhibit a much higher selectivity for PO and a much better stability and reusability than the parent Ti-MWW in the HPPO process. The current study, therefore, provides a new approach to develop efficient catalysts for the HPPO process.
研究领域:
化学工程
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催化科学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
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IF 3.573
Baoyu Liu,Zhantu Liao,Xin Xiao,Shengzhi Gan,Rongchang Luo,Ying Wu,Huiyong Chen,Yanxiong Fang,Jinxiang Dong
The hierarchical structure of zeolites plays a crucial role in determining their catalytic performance. Here, the effect of the hierarchical architecture and surface topology of pillared MWW zeolites on the catalytic properties of liquid alkylation between mesitylene and benzyl alcohol was investigated. Pillared MWW zeolite catalysts exhibited excellent activity (∼100% conversion) due to their elegant pore architecture, which could largely improve the accessibility of bulk molecules toward active sites on the external surface. In addition, molecular simulation showed that lamellar MWW zeolites with a 12-membered ring semicup surface topology could more effectively accommodate and stabilize the large intermediates formed in alkylation reactions compared with MFI zeolites, resulting in outstanding selectivity for 2-benzyl-1,3,5-trimethylbenzene (∼100%). The Thiele modulus (φ) and effectiveness factor (η) verified that the resultant pillared MWW zeolites possessed a high degree of utilization without internal diffusion constraints under the present reaction conditions.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2022
·
IF 5.876
Yanghuan Huang,Haocheng Zhang,Lou Gao,Tianlan Yan,Yueer Yan,Yahong Zhang,Yi Tang
A series of Zr–Al-MWW zeolites with different Zr state and layer-stacking structure are successfully synthesized via direct grafting zirconocene dichloride onto the external silanols of three kinds of MWW zeolites, i.e. MCM-22 with multilayered structure, ITQ-2 (through layer delaminated route) and OL-MWW (by direct hydrothermal synthesis) with oligolayered structure. The structure, porosity and state of grafted Zr species are distinctly different among the three Zr–Al-MWW zeolites. Zr-OL-MWW possesses the highest content of single Zr atoms with an ideal micro-meso-macro pore system, while Zr-MCM-22 and Zr-ITQ-2 contain two kinds of Zr species (ZrO 2 clusters and single Zr atoms) coexisting in various proportions. The high dispersion of single Zr atoms on OL-MWW can be assigned to the large amount of external silanols of OL-MWW. The as-prepared three bi-functional Zr–Al-MWW zeolites are used for the cascade Meerwein-Ponndorf-Verley (MPV) reduction and etherification (ETH) reaction. Among them, Zr-OL-MWW shows dramatically higher conversion of cinnamaldehyde and yield of 1-cinnamyl 2-propyl ether than Zr-MCM-22 and Zr-ITQ-2, owing to the higher catalytic activity of Lewis acid centers from single Zr atoms, as well as more integrated framework Al sites as Brønsted acid centers with good accessibility. This study offers a simple and efficient strategy to construct Lewis-Brønsted acidic zeolites with exposed heteroatom sites and integrated framework structure, which will provide especial potential in the catalytic conversion of macromolecules.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
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2023
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IF 7.3
Yuexia Wang,Qibin Yao,Bowen Xu,Kehang Lin,Mengshan Deng,Xinqing Lu,Rui Ma,Yanghe Fu,Weidong Zhu
Although the oxidative hydration of ethylene with hydrogen peroxide (H 2 O 2 ) to ethylene glycol (EG) over Ti-MWW zeolites take advantages of step-saving and facile operation, both H 2 O 2 utilization efficiency and EG yield are relatively low, because some extra-framework octahedral Ti species are usually formed in the Ti-MWW zeolites synthesized by prevailing methods, which are detrimental to selective oxidation . In the present work, an acid-modulated isomorphous substitution method, i.e. , layered borosilicate MWW-type zeolite (ERB-1) treated with HNO 3 aqueous solution containing tetrabutyl orthotitanate (TBOT), is developed to synthesize a Ti-MWW zeolite without extra-framework octahedral Ti species under the optimized synthesis conditions. In combination with the results from extensive characterizations for the synthesized zeolites, it is found that in the zeolite prepared by the currently developed synthesis method there are more open Ti(OSi) 3 OH sites formed, resulting in the stronger Lewis acidity that is very helpful to EG production from the oxidative hydration of ethylene with H 2 O 2 , compared to the one synthesized by the prevailing method. Moreover, the developed catalyst is recyclable after the regeneration of the deactivated zeolite by calcination at high temperatures. Therefore, it is anticipated that the currently developed Ti-MWW might be industrially applicable in the one-pot synthesis of EG from ethylene with H 2 O 2 .
研究领域:
化学工程
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催化材料科学
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产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
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2022
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IF 8.047
Yuan Liang,Shaoxiang Xu,Meihua Zhu,Jiamin Jiang,Jiao Zhang,Goubing Zhou,Na Hu,Xiangshu Chen,Hidetoshi Kita
In the absence of boric acid, the tubular Ti-MWW zeolite membranes are prepared with dual organic template agents and potassium carbonate by secondary hydrothermal synthesis. 12MR cage and 10 MR of the MWW zeolite topology structure is stabilized by TMAdaOH and HMI organic template agents, K + cations is a critical mineralization agent for preparing Ti-MWW zeolite membrane with bi-layer Ti-MWW zeolites layer in this work. Besides, ion-exchange could greatly improve the catalytic performance of the Ti-MWW zeolite membrane for phenol hydroxylation with H 2 O 2 , influences of ammonium salt, ion-exchange time and temperature on the micro-structure and catalytic performance are investigated. The upper network-like Ti-MWW zeolite layer could be dissolved and removed by ion-exchange with 0.5 M (NH 4 ) 2 SO 4 solution at 60 °C for 24 h, and the “lying” Ti-MWW zeolites layer is kept on the mullite support. On the other hand, ion-exchange could promote the transformation of hexacoordinated extra-framework titanium species to tetracoordinated state in the framework, part of K + cations of Ti-MWW zeolites are replaced with NH 4 + cations. Total flux and phenol conversion of the ion-exchanged Ti-MWW zeolite membrane are 14.89 kg·m −2 ·h −1 and 36.49 % for phenol hydroxylation by H 2 O 2 at 50 °C.
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
KOREAN JOURNAL OF CHEMICAL ENGINEERING
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2022
·Vol. 39
·期 1
·96-108
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IF 3.146
Zeng Xingye,Adesina Adeyemo,Li Ping,Wang Hanlu,Zhou Rujin
Ti-containing Mobil composition of matter-twenty-two (Ti-MWW) zeolite was prepared via a two-step post-synthesis process and then characterized by X-ray fluorescence, nitrogen adsorption-desorption isotherms, Fourier transform infrared absorption spectra, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectra. These results indicate that the textural properties of MWW were well preserved after acid treatment and incorporation of titanium. An adsorptive-oxidative desulfurization (AODS) system was successfully developed on the basis of a model oil containing dibenzothiophene (DBT) with the as-prepared Ti-MWW being the catalyst and adsorbent and cumene hydroperoxide (CHP) being the oxidant. The parameters influencing the desulfurization performance were systematically investigated. These parameters include the Ti-MWW dosage, the reaction temperature, the stirring speed, the molar ratio of CHP to DBT and the additions of olefins and aromatics to the system. The conversion rate of DBT reached 99.6% via the catalytic oxidation process and the turnover frequency was 40.1 h −1 . Meanwhile, the oxidation products of DBT were removed by Ti-MWW adsorption. The recycling and regeneration performance of Ti-MWW were also investigated, and the DBT conversion reached 99.5% using the regenerated Ti-MWW. This work provides useful information for the construction of solvent-free oxidative desulfurization systems using a zeolite.
研究领域:
化学工程
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环境科学
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催化材料
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产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
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2020
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IF 4.217
Mingyi Zhang,Zenan Lin,Qingming Huang,Yadong Zhu,Hui Hu,Xiaohui Chen
In this research, a novel green mechanochemical dry gel conversion method (MDGC) is reported to obtain submicron-sized Ti-rich MWW zeolite. First, titanium and silica sources were milled under milder conditions in a planetary ball mill to construct the uniform SiO 2 -TiO 2 composite powders with higher Ti contents. Subsequently, submicron-sized Ti-rich MWW zeolite powder was prepared via dry gel conversion (DGC) route using the obtained composite under mixed steam environment consisting of water and piperidine. The physicochemical properties of the SiO 2 -TiO 2 composites before and after calcination and corresponding Ti-MWW-MDGC were investigated by XRD, UV–Vis, FT-IR, SEM, XRF, and N 2 absorption-desorption. Moreover, Ti-MWW (30)-MDGC exhibited a superior catalytic activity during epoxidation with H 2 O 2 compared with the traditional DGC method, and the conversion of 1-hexene increased from 4.2% to 26.3%. The MDGC method is a promising approach for the green production of various zeolites with higher heteroatom contents, such as TS-1, Ti-Beta and Sn-MWW, etc.
研究领域:
材料科学
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无机化学
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催化化学
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纳米材料
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绿色化学
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2023
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IF 5.2
Shaoxiang Xu,Meihua Zhu,Pengming Huang,Shengao Zheng,Yujie Qiao,Yuan Liang,Xiangshu Chen,Hidetoshi Kita
Nano-size titanium silicalites is difficult to be separate from the reaction solution, lamellar and homogeneous Ti-MWW zeolites are successfully formed a dense zeolite layers on α-Al 2 O 3 pellets by secondary hydrothermal synthesis in this study. Seeded crystals concentration and titanium source have significantly influences on the morphology, thickness and titanium active sites of Ti-MWW zeolites. Doping NH 4 F in the precursor synthesis solution could conducive to prepare macroscopically and anatase-free Ti-MWW zeolites layer on the outside of α-Al 2 O 3 pellets, and the thickness of the Ti-MWW zeolites layer is ca. 1 mm. Besides, catalytic performance of the supported Ti-MWW zeolites are significantly improved by NH 4 F. A fixed-bed reactor with the supported Ti-MWW zeolites are applied to catalyze phenol hydroxylation with hydrogen peroxide efficiently, and reaction time and temperature, amount of the supported Ti-MWW zeolites have obvious effects on the phenol conversion and dihydroxybenzene selectivity. When the actual mass of Ti-MWW zeolites to volume of reaction solution is only 10 g/L, the relative phenol conversion and dihydroxybenzene selectivity are 46.45% and 92.72% at 65 °C after 3 h, respectively.
研究领域:
催化
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 153
·期 2
·348-363
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IF 2.936
Chu Jidong,Ge Zhijin,Peng Jiahui,Hu Hui,Guo Shujuan,Chen Xiaohui
The efficient and economic heteroatom-implanting method for MWW-type zeolite has been the focus of attention and needs further exploration. Ti incorporated MWW zeolite was synthesized by sequential treatment of boron-containing zeolite precursor. The catalysts were applied to the epoxidation of 1-hexene. The implanting titanium process was conducted under a mild condition with Ti(SO 4 ) 2 /NH 4 HF 2 /HNO 3 solution, and the product Ti-MWW precursors have framework titanium alone, the novel method is named as refluxing and implanting titanium method which integrates acid treatment and titanium incorporation into one step and reduces the consumption of time of this process into 1 h. A density functional theory was conducted to explain the formation mechanism of interlayer-expanded structure of Ti-MWW zeolite. Subsequently, Ti-MWW precursors were treated in modified reagent solution to obtain larger pore structure, which increase the conversion of 1-hexene from 20.45 to 62.96%. The catalytic performance of Ti-MWW zeolite in this work are superior to Ti-MWW zeolite synthesized by traditional dry-gel conversion method the conversion of 1-hexene of which was 4.2%. This novel method is a promising approach for the synthesis of high catalytic performance heteroatomic zeolite. Graphical abstract
研究领域:
材料科学
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化学工程
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催化
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无机化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）