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学者姓名：刘杰
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Abstract ：
The low efficiency of growing single-walled carbon nanotubes (SWCNT) poses a barrier to their application in high-performance electronic devices. However, it is difficult to control the uniform growth of SWCNT in a floating catalytic reactor due to the complex parameter control. Therefore, it is essential to enhance the growth of SWCNT in the floating catalyst chemical vapor deposition (FCCVD) process. In the present work, the influence of the reactive flow field on the growth of SWCNT, which is often neglected, is revealed. To address this issue, this work combines experiments and simulations to obtain the characteristics of the field distribution within the reactor and the trend of the products. The results of the flow field analysis indicate that thermal buoyancy is the cause of SWCNT growth limitation in FCCVD. By weakening the thermal buoyancy, a homogeneous reaction field is obtained; vortices in the flow field are reduced or even disappear; the temperature field is more homogeneous, and, importantly, the crystallinity of SWCNT is enhanced (IG/ID up to 20-fold). In addition, the decomposition process of the carbon source is also enhanced, thus suppressing the generation of by-products. Based on the results of the small tube experiments, both the increase in temperature and the decrease in residence time increased the IG/ID. Furthermore, the distributions of the maximum and minimum diameters in SWCNT imply variations in the growth modes of SWCNT at different temperatures. © 2024 Elsevier B.V.
Keyword ：
Buoyancy Buoyancy Catalysts Catalysts Chemical vapor deposition Chemical vapor deposition Crystallinity Crystallinity Flow fields Flow fields Residence time distribution Residence time distribution Single-walled carbon nanotubes (SWCN) Single-walled carbon nanotubes (SWCN)
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| GB/T 7714 | Yu, Guo , Han, Peilin , Yi, Hongmei et al. Study of field distribution characteristics in CVD reactors and enhanced growth of SWNCT [J]. | Diamond and Related Materials , 2024 , 145 . |
| MLA | Yu, Guo et al. "Study of field distribution characteristics in CVD reactors and enhanced growth of SWNCT" . | Diamond and Related Materials 145 (2024) . |
| APA | Yu, Guo , Han, Peilin , Yi, Hongmei , Zhao, Jiaxiang , Hou, Songjia , Yan, Zuoyi et al. Study of field distribution characteristics in CVD reactors and enhanced growth of SWNCT . | Diamond and Related Materials , 2024 , 145 . |
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Dehydroxylation of biomass-based platform molecules is critical for obtaining building blocks for use in the chemical industry. Acid catalytic dehydration has provided a feasible route. However, simultaneously pursuing high product-selective and ultra-stable catalysts for the dehydroxylation of polyols remains an open challenge. In this study, a strategy for in-situ Bronsted acid sites (BAS) with chemo-adsorption selectivity is proposed. The construction of defect sites B[3] and P[4] species has been proved to be a prerequisite for the dynamic acid site formation at hydrothermal conditions. The BPO4 catalyst with in-situ BAS can achieve the high selectivity of acrolein (similar to 80%) and robust stability of catalyst (over 425 h) using glycerol dehydration as a model reaction. In addition, in-situ BAS is highly selective for secondary hydroxyl groups and has been extended to other substrate applications. This catalytic strategy provides a green, efficient, and economical approach for converting biomassderived polyols to high-value-added chemicals.
Keyword ：
Acrolein Acrolein Biomass Biomass Dehydration Dehydration Glycerol Glycerol In -situ Br onsted acid In -situ Br onsted acid
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| GB/T 7714 | Su, Chenxin , Zhou, Shouquan , Wu, Shaoyun et al. Highly efficient dehydration of polyols: In-situ Brempty setnsted acid from boron phosphate catalyst [J]. | CHEMICAL ENGINEERING JOURNAL , 2024 , 483 . |
| MLA | Su, Chenxin et al. "Highly efficient dehydration of polyols: In-situ Brempty setnsted acid from boron phosphate catalyst" . | CHEMICAL ENGINEERING JOURNAL 483 (2024) . |
| APA | Su, Chenxin , Zhou, Shouquan , Wu, Shaoyun , Gao, Mingbin , Zhang, Weiling , Ma, Zhuang et al. Highly efficient dehydration of polyols: In-situ Brempty setnsted acid from boron phosphate catalyst . | CHEMICAL ENGINEERING JOURNAL , 2024 , 483 . |
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The mild alkali-treated 13X was employed in the liquid phase isomerization reaction of alpha-pinene to increase the yield of limonene. A maximum alpha-pinene conversion of 100% and limonene yield of 59.1% could be achieved. Crystallinity could be well retained, and the amounts of medium-strong acid sites and the distribution of Bronsted and Lewis acid sites could be changed after the mild alkali treatment for 13X zeolite. Samples with higher micropore specific surface area were easier to obtain higher yields of limonene due to shape-selectivity. A proper amount of the medium-strong acid and the synergistic effect of Bronsted and Lewis acid sites were beneficial to enhance the catalytic activity and the yield of monocyclic product limonene. The main reason for catalyst deactivation could be the decrease in the active sites due to soft coke deposition. For the regeneration process, the conversions of alpha-pinene were between 95% and 99% during the first seven cycles and the conversion dropped to 90.6% after the eighth cycle, which demonstrated that the ethanol flushing and calcination could be an effective regeneration method for the 13X catalyst used in the alpha-pinene isomerization reaction.
Keyword ：
13X zeolite 13X zeolite Limonene Limonene Mild alkali treatment Mild alkali treatment ?-pinene isomerization ?-pinene isomerization
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| GB/T 7714 | Su, Chenxin , Luo, Xiheng , Chen, Jingjing et al. Effective synthesis of limonene over mild alkali-modified 13X catalysts in alpha-pinene isomerization [J]. | MICROPOROUS AND MESOPOROUS MATERIALS , 2023 , 348 . |
| MLA | Su, Chenxin et al. "Effective synthesis of limonene over mild alkali-modified 13X catalysts in alpha-pinene isomerization" . | MICROPOROUS AND MESOPOROUS MATERIALS 348 (2023) . |
| APA | Su, Chenxin , Luo, Xiheng , Chen, Jingjing , Wu, Dan , Fan, Lihai , Liu, Jie et al. Effective synthesis of limonene over mild alkali-modified 13X catalysts in alpha-pinene isomerization . | MICROPOROUS AND MESOPOROUS MATERIALS , 2023 , 348 . |
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本发明公开了一种以碳包覆氧化铝核壳结构为载体的铂系催化剂及其制备方法和应用。首先以氧化铝粉末为内核，选择液态碳源，采用化学气相沉积法(CVD)制备碳包覆氧化铝的核壳结构载体，随后用铂的前驱体溶液浸渍载体，干燥后进行还原，得到碳壳内包氧化铝、外负载铂纳米颗粒的铂系催化剂。本发明所制备的催化剂结构新颖，且相对于传统Pt/Al2O3催化剂在低碳烷烃脱氢反应中具有更加优异的催化性能和稳定性，制备方法简单，成本也更低，这为今后开发高稳定性和活性的低碳烷烃脱氢催化剂具有重要的参考价值。
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| GB/T 7714 | 刘杰 , 汪义香 , 王皓月 et al. 一种以碳包覆氧化铝核壳结构为载体的铂系催化剂及其制备方法和应用 : CN202210274974.3[P]. | 2022-03-21 00:00:00 . |
| MLA | 刘杰 et al. "一种以碳包覆氧化铝核壳结构为载体的铂系催化剂及其制备方法和应用" : CN202210274974.3. | 2022-03-21 00:00:00 . |
| APA | 刘杰 , 汪义香 , 王皓月 , 曾庆旺 , 魏苏沐 , 郑辉东 . 一种以碳包覆氧化铝核壳结构为载体的铂系催化剂及其制备方法和应用 : CN202210274974.3. | 2022-03-21 00:00:00 . |
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本发明公开了一种以羟基化氮化硼为载体的铂系催化剂的制备方法。其是通过强酸溶液对所制备的氮化硼材料进行处理后，于惰性气体中高温焙烧，得到羟基化氮化硼载体；再用含铂化合物溶液及含锡化合物对其进行铂、锡双负载，在惰性气体中干燥后进行还原。所得催化剂用于低碳烷烃脱氢反应，具有较高的活性。且现有的文献与专利未发现类似的材料能用于丙烷直接脱氢反应中，因而具有非常新颖的研究意义。
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| GB/T 7714 | 刘杰 , 王皓月 , 汪义香 et al. 一种以羟基化氮化硼为载体的铂系催化剂及其制备方法 : CN202210277907.7[P]. | 2022-03-21 00:00:00 . |
| MLA | 刘杰 et al. "一种以羟基化氮化硼为载体的铂系催化剂及其制备方法" : CN202210277907.7. | 2022-03-21 00:00:00 . |
| APA | 刘杰 , 王皓月 , 汪义香 , 曾庆旺 , 魏苏沐 , 郑辉东 . 一种以羟基化氮化硼为载体的铂系催化剂及其制备方法 : CN202210277907.7. | 2022-03-21 00:00:00 . |
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本发明公开了一种以氮化硼掺杂二氧化硅为载体的铂系催化剂的制备方法。其是通过将硼源、氮源、硅源按照一定摩尔比水解、纯化、干燥、高温焙烧制得氮化硼掺杂二氧化硅载体；再以含铂的前驱体溶液对其进行铂负载，最后进行还原，得到以氮化硼掺杂二氧化硅为载体的铂系催化剂。所得催化剂用于低碳烷烃脱氢反应，具有较高的活性和稳定性。且现有的文献与专利未发现类似的材料能用于丙烷直接脱氢反应中，因而具有非常新颖的研究意义。
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| GB/T 7714 | 刘杰 , 王皓月 , 汪义香 et al. 一种以氮化硼掺杂二氧化硅为载体的铂系催化剂及其制备方法 : CN202210277924.0[P]. | 2022-03-21 00:00:00 . |
| MLA | 刘杰 et al. "一种以氮化硼掺杂二氧化硅为载体的铂系催化剂及其制备方法" : CN202210277924.0. | 2022-03-21 00:00:00 . |
| APA | 刘杰 , 王皓月 , 汪义香 , 魏苏沐 , 曾庆旺 , 郑辉东 . 一种以氮化硼掺杂二氧化硅为载体的铂系催化剂及其制备方法 : CN202210277924.0. | 2022-03-21 00:00:00 . |
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本发明公开了一种以SiO2@C为载体的铂系催化剂及其制备方法和应用。首先采用stober法制备SiO2内核，再加入碳源前驱体包覆SiO2内核，随后通过高温焙烧制备得到内核二氧化硅、外石墨化碳壳层的SiO2@C核壳结构载体，最后用铂的前驱体溶液浸渍载体，干燥后进行还原，得到石墨化碳壳内包内核SiO2、外负载活性金属Pt纳米颗粒的核壳结构铂系催化剂。本发明所制备的催化剂结构新颖，在低碳烷烃脱氢反应中具有较好的活性和稳定性，且制备方法简单，在开发高稳定性和活性的低碳烷烃催化剂中具有重要的参考意义。
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| GB/T 7714 | 刘杰 , 汪义香 , 王皓月 et al. 一种以SiO2@C为载体的铂系催化剂及其制备方法和应用 : CN202210275217.8[P]. | 2022-03-21 00:00:00 . |
| MLA | 刘杰 et al. "一种以SiO2@C为载体的铂系催化剂及其制备方法和应用" : CN202210275217.8. | 2022-03-21 00:00:00 . |
| APA | 刘杰 , 汪义香 , 王皓月 , 魏苏沐 , 曾庆旺 , 郑辉东 . 一种以SiO2@C为载体的铂系催化剂及其制备方法和应用 : CN202210275217.8. | 2022-03-21 00:00:00 . |
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本发明公开了一种甘油脱水催化剂及其制备方法和应用，该方法通过浸渍法制备了一种负载型磷酸硼催化剂。在固定床反应器中，反应温度为280~360℃，10%~30%的甘油水溶液为原料，以该催化剂催化甘油脱水反应，甘油转化率100%，丙烯醛选择性可达76%，羟基丙酮选择性达15%。并且该催化剂具有良好的稳定性，可以反应200h未明显失活。并且经过简单再生处理，可快速恢复催化剂活性。本发明提供的催化剂，制备工艺简单，易于工业化，为生物甘油转化为高附加值产品提供了一条良好的道路。
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| GB/T 7714 | 郑辉东 , 苏晨欣 , 周守泉 et al. 一种甘油脱水催化剂及其制备方法和应用 : CN202210060922.6[P]. | 2022-01-19 00:00:00 . |
| MLA | 郑辉东 et al. "一种甘油脱水催化剂及其制备方法和应用" : CN202210060922.6. | 2022-01-19 00:00:00 . |
| APA | 郑辉东 , 苏晨欣 , 周守泉 , 吴乃昕 , 刘杰 , 陈晶晶 . 一种甘油脱水催化剂及其制备方法和应用 : CN202210060922.6. | 2022-01-19 00:00:00 . |
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The conversion of terpinolene epoxide to terpinen-4-ol is a desirable chemical transformation for the pro-duction of a valuable intermediate. This paper describes a one-pot, two-step system for the reaction that uses a bifunctional Ni/TiO2-SiO2 catalyst with isomerization and hydrogenation capabilities. The TiO2- SiO2 serves to isomerize the starting epoxide. The Ni component works to hydrogenate the allylic double bond. The tandem system achieves a high 64% yield of terpinen-4-ol. X-ray diffraction analysis showed that TiO2-SiO(2 )was a mixed binary oxide, and Fourier transform infrared spectroscopy of adsorbed pyr-idine suggested that acid sites were mainly Lewis acid sites. Electron microscopy showed that the Ni/TiO2-SiO2 catalyst consisted of spherical particles comprising a titanosilicate phase with highly dispersed zero-valent Ni or anatase on the surface. Additionally, there was strong interaction between Ni and the TiO2-SiO2 mixed oxides. Control kinetic experiments demonstrated that the tandem use of the catalysts was more effective than simultaneous operation. (C) 2022 Published by Elsevier Ltd.
Keyword ：
Hydrogenation Hydrogenation Isomerization Isomerization Ni catalyst Ni catalyst Tandem catalysis Tandem catalysis TiO (2) -SiO (2) mixed oxides TiO (2) -SiO (2) mixed oxides
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| GB/T 7714 | Liu, Jie , Cui, Jianhao , Chen, Lei et al. Advantages of tandem versus simultaneous operation: The case of isomerization/hydrogenation of terpinolene epoxide to Terpinen-4-ol using a Ni/TiO2-SiO(2 )bifunctional catalyst [J]. | CHEMICAL ENGINEERING SCIENCE , 2022 , 259 . |
| MLA | Liu, Jie et al. "Advantages of tandem versus simultaneous operation: The case of isomerization/hydrogenation of terpinolene epoxide to Terpinen-4-ol using a Ni/TiO2-SiO(2 )bifunctional catalyst" . | CHEMICAL ENGINEERING SCIENCE 259 (2022) . |
| APA | Liu, Jie , Cui, Jianhao , Chen, Lei , Chen, Jingjing , Zheng, Huidong , Oyama, S. Ted . Advantages of tandem versus simultaneous operation: The case of isomerization/hydrogenation of terpinolene epoxide to Terpinen-4-ol using a Ni/TiO2-SiO(2 )bifunctional catalyst . | CHEMICAL ENGINEERING SCIENCE , 2022 , 259 . |
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本发明公开了一种利用天然黏土矿物制备分子筛的方法，其是将高温活化后的高温焙烧硅藻土通过加入一定量的酸液进行处理并过滤，得到高硅铝比的硅藻土和低硅酸液；然后将所得高硅硅藻土作为硅铝源合成高硅ZSM‑22分子筛，将所得低硅酸液通过添加不同量的高温焙烧硅藻土、NaOH，以合成中、低硅铝比的梯级孔MOR、MFI或GME分子筛。本发明利用单一天然硅藻土经酸处理产生的环状物发挥异质晶种和促进成核的作用，在不需外加化学硅铝源或其它天然矿物的条件下，通过调控酸处理浓度和固液比达到对所合成分子筛织构形貌的调控，从而合成高、中、低硅铝比不同构型的分子筛。
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| GB/T 7714 | 岳源源 , 范文青 , 胡元 et al. 一种利用天然黏土矿物制备分子筛的方法 : CN202110963356.5[P]. | 2021-08-20 . |
| MLA | 岳源源 et al. "一种利用天然黏土矿物制备分子筛的方法" : CN202110963356.5. | 2021-08-20 . |
| APA | 岳源源 , 范文青 , 胡元 , 徐景东 , 鲍晓军 , 刘杰 et al. 一种利用天然黏土矿物制备分子筛的方法 : CN202110963356.5. | 2021-08-20 . |
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