FUEL
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2017
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IF 4.601
Sainan Wei,Huijun He,Yan Cheng,Chunping Yang,Guangming Zeng,Li Kang,Hui Qian,Canyao Zhu
Sulfur-containing compounds in oils are harmful to the ecosystem whose cost-effective removal is still a challenge. In this study, novel heterogeneous catalysts of cobalt supported on KIT-6 mesoporous silicas were prepared and evaluated for oxidative desulfurization (ODS) under ambient conditions using cyclohexanone peroxide (CYHPO) as the oxidant. The model oil was obtained via dissolving DBT in the n-octane. The conventional wet impregnation method was applied for the preparation of the catalysts, and cobalt nitrate was used as the precursor. The catalysts were characterized by XRD, N 2 -physisorption, FT-IR, TGA, SEM/TEM and XPS. Then their catalytic activities in total oxidation of dibenzothiophene (DBT) were evaluated at various conditions. DBT conversion by this heterogeneous ODS system reached 98.68%. Co/KIT-6 catalysts showed high ODS activity due to Ia3d mesoporous structure resulting in better cobalt dispersion, higher activity of Co, and faster diffusion of reactant and products. The Box-Behnken design showed that the optimum values for the conversion of DBT were 93 °C (oxidation temperature), 1.6 × 10 −1 g (catalyst amount) and 5.7 (O/S molar ratio), respectively. The inhibitory effect of quinoline on ODS was higher than carbazole and indole, adding quinoline into model oil under same conditions led to a decrease of the conversion of DBT from 98.68% to 65.67% when the concentration of quinoline increased from 160 ppm to 4845 ppm. Kinetics data correlated well with the pseudo-first-order equation. These data showed that this novel Co/KIT-6 catalysis system has the potential to be applied in ODS from oils.
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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DOI
高影响因子
CATALYSIS LETTERS
·
2015
·Vol. 145
·期 3
·784-793
·
IF 2.307
Zhang Xuejun,Zhang Peipei,Yu Hongbo,Ma Zhen,Zhou Shenghu
Abstract Bimetallic PdM (M = Ni, Co, Fe) nanoparticles were synthesized using butyllithium as a reductant, and were used to prepare Pd–M
x
O
y
/KIT-6 catalysts by appropriate oxidation and reduction treatments. These catalysts showed higher selectivity in the hydrogenation of p -chloronitrobenzene to p -chloroaniline than Pd/KIT-6. Relevant characterization was conducted using X-ray diffraction, transmission electron microscopy, N 2 adsorption–desorption, X-ray photoelectron spectroscopy, inductive coupled plasma emission spectrometer, and H 2 temperature-programmed reduction. Graphical Abstract
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
INORGANIC CHEMISTRY
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2023
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IF 4.6
Zhijie Zhang,Deben Li,Hao Hu,Yaoqing Chu,Jiayue Xu
Metal halide perovskites (MHPs) are emerging as promising candidates for photocatalytic CO2 conversion. However, their practical application is still restricted by the poor intrinsic stability and weak adsorption/activation toward CO2 molecules. The rational design of MHPs-based heterostructures with high stability and abundant active sites is a potential solution to this obstacle. Herein, we report the in situ growth of lead-free Cs2CuBr4 perovskite quantum dots (PQDs) in KIT-6 mesoporous molecular sieve, obtaining remarkable photocatalytic CO2 reduction activity and durable stability. The optimized Cs2CuBr4@KIT-6 heterostructure exhibits the photocatalytic CO and CH4 evolution rates of 51.6 and 17.2 μmol g–1 h–1, respectively, far exceeding those of pristine Cs2CuBr4. On the basis of in situ diffuse reflectance infrared Fourier transform spectra and theoretical investigations, the detailed CO2 photoreduction pathway is systematically revealed. This work provides a new route for the rational construction of perovskite-based heterostructures with strong CO2 adsorption/activation and good stability for photocatalytic CO2 reduction.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
PubMed
高影响因子
Scientific Reports
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2024
·Vol. 14
·期 1
·1-9
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IF 3.8
Yuan Fang-Fang,Wang Pei,Han Xiao-Jie,Qin Ting-Ting,Lu Xin,Bai Hai-Jiao
The microreactor with two types of immobilized enzymes, exhibiting excellent orthogonal performance, represents an effective approach to counteract the reduced digestion efficiency resulting from the absence of a single enzyme cleavage site, thereby impacting protein identification. In this study, we developed a hydrophilic dual-enzyme microreactor characterized by rapid mass transfer and superior enzymatic activity. Initially, we selected KIT-6 molecular sieve as the carrier for the dual-IMER due to its three-dimensional network pore structure. Modification involved co-deposition of polyethyleneimine (PEI) and acrylamide (AM) as amine donors, along with dopamine to enhance material hydrophilicity. Remaining amino and double bond functional groups facilitated stepwise immobilization of trypsin and Glu-C. Digestion times for bovine serum albumin (BSA) and bovine hemoglobin (BHb) on the dual-IMER were significantly reduced compared to solution-based digestion (1 min vs. 36 h), resulting in improved sequence coverage (91.30% vs. 82.7% for BSA; 90.24% vs. 89.20% for BHb). Additionally, the dual-IMER demonstrated excellent durability, retaining 96.08% relative activity after 29 reuse cycles. Enhanced protein digestion efficiency can be attributed to several factors: (1) KIT-6’s large specific surface area, enabling higher enzyme loading capacity; (2) Its three-dimensional network pore structure, facilitating faster mass transfer and substance diffusion; (3) Orthogonality of trypsin and Glu-C enzyme cleavage sites; (4) The spatial effect introduced by the chain structure of PEI and glutaraldehyde’s spacing arm, reducing spatial hindrance and enhancing enzyme–substrate interactions; (5) Mild and stable enzyme immobilization. The KIT-6-based dual-IMER offers a promising technical tool for protein digestion, while the PDA/PEI/AM-KIT-6 platform holds potential for immobilizing other proteins or active substances.
研究领域:
生物化学
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蛋白质组学
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DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
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2023
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IF 5.5
Shaoqing Wang,Yan Jiao,Zhihe Li,Zhen Wan,Yu Han,Weiming Yi
In this paper, a surface encapsulation method has been developed to synthesize the HZSM-5 @Al-KIT-6 hierarchical zeolites, due to the poor mono-aromatic hydrocarbons (MAHs) selectivity and rapid coke deactivation during the catalytic upgrading lignin pyrolysis vapors. Results showed that the acidity and accessibility of HZSM-5 @Al-KIT-6 hierarchical zeolite can be modulated by changing the TEOS/HZSM-5 mass ratio during catalyst synthesis. The three-dimensional (3-D) cubic mesoporous shell can capture the bulky phenolic oligomers and pre-crack for further reforming. The highest MAH content (44.03%) and lower polycyclic aromatic hydrocarbons (PAHs) (23.79%) were produced when the TEOS/HZSM-5 mass ratio was 1.0. The hierarchical zeolites improved the yield of xylenes due to the enhanced alkylation reaction. In addition, the micro-mesoporous highway reduced the formation of coke deposition. The catalytic mechanism of hierarchical zeolites was then proposed based on the obtained results. This study provides a reference for pilot-scale experiments for the catalytic upgrading lignin pyrolysis vapors.
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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2019
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IF 3.375
Li Gao,Ubong Jerome Etim,Zhiyuan Shi,Wei Xing,Pingping Wu,Dezhi Han,Peng Bai,Zifeng Yan
A Beta-KIT-6 (BK) micro-mesoporous composite material was assembled using zeolite Beta seed solution as raw material. BK composite contained both zeolite Beta units and three-dimensional cubic Ia3d mesostructure of KIT-6, which served as a catalyst support for hydroisomerization of n-heptane. The composite was characterized by a variety of techniques. Results show that catalyst Pt/HBK using the composite as the support exhibited the highest isoheptanes yield among all catalysts, which is attributed to both appropriate surface acidity and excellent mass transfer properties of Beta-KIT-6 composite. Experimental results verified that the indexed isomerization factor as a general performance descriptor could accurately predict the hydroisomerization performance of support materials.
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
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2023
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IF 3.4
Guoliang Zhang,Haoyu Liu,Sen Fu,Hong Yuan
BACKGROUND A series of ZSM-5@KIT-6 composite molecular sieve catalysts was prepared by encapsulating ZSM-5 as a substrate in the mesoporous material KIT-6. The intent was to use these catalysts to promote the catalytic cracking of a waste cooking oil model compound (WCOMC) to produce light olefins. RESULTS The morphology, structural characteristics and acidity of each of the resulting catalysts were characterized by X-ray diffraction, transmission electron microscopy, N 2 -Brunauer–Emmett–Teller (N 2 -BET) surface area analysis and temperature-programmed ammonia desorption. The results showed that ZSM-5 was successfully coated with KIT-6. The BET surface areas of these catalysts ranged from 345 to 792 m 2 g −1 and the specimens had average pore sizes in the range of 2.37–5.51 nm. Total acidity increased with increases in the mass-based proportion of ZSM-5 in the material. CONCLUSION The catalytic cracking of WCOMC was studied in a lab-scale fixed-bed apparatus. Trials at a reaction temperature of 600 °C using the material having a mass-based ZSM-5 proportion of 80.0% (ZK-80) gave the highest gas-phase yield of light olefins of 43.8%. After 6000 min, the catalytic performance of this material remained stable, demonstrating a resistance to carbon deposits. The superior activity of the present composite catalysts can be ascribed to improvements in pore structure and acid strength distribution. © 2023 Society of Chemical Industry (SCI).
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
JOURNAL OF POROUS MATERIALS
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2023
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IF 2.6
Zhang Guoliang,Liu Hao,Yuan Hong
Ni/KIT-6 catalysts were synthesized using ordered mesoporous silica-based KIT-6 molecular sieves as a support in conjunction with an impregnation method. These catalysts were characterized using transmission electron microscopy, X-ray diffraction, N 2 -Brunauer–Emmett–Teller surface area analysis and hydrogen temperature-programmed reduction. The results showed good dispersion of metallic nickel (Ni) on the surface of the KIT-6 and strong interactions between the metal and carrier. The surface areas of the catalysts were in the range of 387–788 m 2 /g and the average pore diameters were in the range of 5.5–8.6 nm. Following H 2 reduction, these materials were applied to the catalytic cracking of a waste cooking oil model compound to produce hydrogen and carbon nanotubes in a laboratory-scale fixed bed reactor. A catalyst with a Ni loading of 10 wt% showed optimal catalytic activity. Reaction trials using an oil flow rate of 0.04 mL/min at 750 °C provided an instantaneous H 2 volume-based proportion of 44.2% with a maximum H 2 concentration in the gaseous products of 59.0% after 25 min. Analyses by thermogravimetry and Raman spectroscopy indicated that carbon nanotubes deposited on the spent catalyst had good oxidative stability and a high degree of graphitization.
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
CATALYSIS LETTERS
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2024
·
IF 2.3
Xiong Ying,Jia Yushan,Yang Ruixi,Wang Peng,Feng Xiaogeng,Cui Junshuo,Lou Zhenning,Shan Weijun,Yu Haibiao
In this paper, the foam-like multi-stage porous 3wt%Al-KIT-6-4T(WI) catalyst was prepared and employed for efficient catalyzing biomass-derived GVL to butene. It is found that the prepared 3wt%Al-KIT-6-4T(WI) catalyst possess abundant mesoporous and presented the foam-like microstructure. Due to this, the 3wt%Al-KIT-6-4T(WI) catalyst has large specific surface area (517.09 m 2 ·g −1 ) and adequate amount of surface acid sites (both Brønsted and Lewis acid site). The special microstructure further improves the mass transfer efficiency of reactants and products. Under the optimized reaction conditions, the butene yield over the 3wt%Al-KIT-6-4T(WI) catalyst can up to 93.78% at 300 °C, after reacting 240 min. Moreover, the 3wt%Al-KIT-6-4T(WI) catalyst still showed excellent regeneration stability, and above 72% butene yield can be maintained after 7th cycle tests. Graphical Abstract
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
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2022
·Vol. 97
·期 8
·2055-2067
·
IF 3.709
Xiaolong Liu,Jingye Ma,Minxin Wang,Hong Yuan
BACKGROUND A series of mesoporous Pt@KIT−6/SAPO−11 catalysts with SiO 2 :Al 2 O 3 molar ratios of 0.3, 0.4, or 0.5 and Pt loadings of 0.4, 0.8, or 1.2 wt% were prepared via an in situ encapsulation process using a PEO − PPO − PEO triblock copolymer (EO 20 PO 70 EO 20 , P123) as the mes. China 750001 oporous template and KIT−6 molecular sieves as the silicon source. RESULTS These catalysts were characterized by transmission electron microscopy (TEM), specific surface area analysis, and pyridine–infrared spectroscopy (Py − IR). The results showed that Pt nanoparticles with particle sizes of 3–7 nm were uniformly dispersed on the supports. These materials also exhibited good mesoporous structures with specific surface areas of 138–197 m 2 /g and average pore sizes of 7.1–9.9 nm. The specimens having a SiO 2 :Al 2 O 3 molar ratio of 0.4 also showed an orderly strip−shaped pore structure. The Py − IR results indicated that the catalysts had both Brønsted acid and Lewis acid sites, with total acid contents in the range of 77.8–131.1 μmol/g. CONCLUSION The decarboxylation of oleic acid using these materials under CO 2 was examined. The catalyst with a SiO 2 :Al 2 O 3 molar ratio of 0.4 and a Pt loading of 0.8 exhibited the best catalytic performance and a C8 − C17 alkanes yield as high as 85.1% at 340 °C by using a catalyst−to−oil mass ratio of 1:10 and a reaction time of 5 h. This performance was attributed to the ordered mesoporous structure of this catalyst along with its high surface area (173 m 2 /g), good crystallinity (92.8%), suitable acid content (98.6 μmol/g), and abundant Pt metal active sites. © 2022 Society of Chemical Industry (SCI).
研究领域:
催化化学
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材料科学
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能源化学
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高影响因子
RENEWABLE ENERGY
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2022
·
IF 8.634
Quan Wang,Wenlei Xie,Lihong Guo
The development of feasible ecofriendly processes for biodiesel production is highly desirable to meet the requirement of green chemistry and sustainable development. To reach this goal, the molybdenum and zirconium oxides were incorporated into commercial available KIT-6, mesoporous silica nanoparticle , by a solvothermal method, to form MoO 3 /ZrO 2 /KIT-6 catalyst. The targeted solid composite catalysts were structurally characterized using XRD , TEM, SEM, XPS , EDS, TG, and nitrogen porosimetry measurement. The characterization results showed that the ordered porous structure of the support was well persevered with high surface area, and the molybdenum and zirconium oxides could be highly dispersed on the mesoporous support. The acidic nature of the solid catalyst was evaluated in detail by means of NH 3 -TPD and infrared spectra of adsorbed pyridine techniques. It was indicated that the acidities of the solid catalysts, with both Brønsted and Lewis acid sites, could greatly affected their catalytic activity . This catalyst displayed high activities to the transesterification of triglycerides and esterification of free fatty acids (FFAs) simultaneously owing to the synergistic effect of Brønsted and Lewis acid sites, thus achieving one-pot heterogeneous production of biodiesel as the low-quality oil was used as feedstocks . The influence of reaction parameters and the catalyst reusability were also investigated, and the best oil conversion of 92.7% was obtained under the optimized reaction conditions. The targeted catalyst exhibited a better FFAs and water tolerant for the reaction, advantageously with no noticeable decline in the catalytic performance even after five reaction cycles.
研究领域:
化学工程
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催化材料
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可再生能源
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DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2025
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IF 4.7
Zongpeng Liu,Shaojian Hu,Qingquan Hao,Rui Ma,Yuning Zhang,Bencheng Wu,Jianhua Zhu
Nowadays, heterogeneous catalytic esterification for synthetic esters production is believed more compatible with the postulates of green chemistry and sustainability goals. In this work, we developed hydrophobic stannous oxide supported on mesoporous silica KIT-6 materials (SnO/KIT-6) via a feasible synthesis and post-grafting modification approach, which served as solid heterogeneous catalysts and then tested in the synthesis of complex polyolester (CPE). The catalytic behaviour of as-prepared catalysts was also systematically investigated and the highest carboxyl conversion ( ca. 95.6%) could be achieved under the optimal preparation conditions within the studied range. The obtained results revealed that Lewis acidity of the tin-based catalysts played a crucial role in esterification conversion efficiency, which varied depending upon the dispersion of different SnO loading. Furthermore, the reusability of the catalyst was evaluated and demonstrated relatively stable catalytic activity for up to five consecutive cycles. Additionally, the possible esterification reaction mechanism of CPE over the modified S-SnO/KIT-6 was also elucidated. The resultant catalysts leveraged full advantage of the unique textural properties and adequate surface hydrophobicity, intensively facilitating the diffusion of large polar molecules and resisting to deactivation from generated water. Collectively, the findings of present study may provide some valuable insights for adopting productive and environmentally benign catalytic processes to synthesize ester-based lubricants in the future.
研究领域:
催化
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绿色化学
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材料科学
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化学工程
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纳米技术
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DOI
高影响因子
危险品化学品经营许可证（带存储）