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Abstract ：
Aiming to improve the decay in thermochemical energy storage (TCES) performance of CaO-based looping materials with the number of carbonation/calcination cycles, a series of Y/Mg-codoped CaO-based materials were prepared by using the classical sol-gel method and citric acid as a carbon template to enhance the porosity and specific surface area. The structural characterizations showed that Y and Mg were presented in two forms. Part of Y/Mg was presented in the form of Y2O3 and MgO nanoparticles with an average size of 15 and 40 nm, respectively. These Y2O3 and MgO nanoparticles with high Tammann temperature and thermal conductivity were highly dispersed to retard the sintering and growth of CaO grains. The rest of Y and Mg were doped into the framework of the CaO lattice in atomic form by substituting Ca atoms. These Y and Mg created a large amount of the oxygen vacancies surrounding Ca atoms to facilitate the electron transfer from Ca2+ ions to dopants, which enhanced the CO2 capture capacity of CaO-based materials by improving the kinetics of the carbonation reaction. As a result, the optimal CaO-based composite denoted as Ca/Y5/Mg10 exhibited a high initial energy storage density of up to >2300 kJ/kg and held an excellent looping reaction stability after 25 carbonation/calcination cycles owing to the cooperation of Y with Mg additives. This work provided effective and economical CaO-based looping materials for application in thermochemical energy storage.
Keyword ：
CaO-based materials CaO-based materials carbonation/calcination cycles carbonation/calcination cycles sintering resistance sintering resistance thermochemical energy storage thermochemical energy storage Y/Mg codoping Y/Mg codoping
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| GB/T 7714 | Wang, Jifu , Xiong, Wei , Ding, Zhengxin et al. Enhancing the Stability of CaO-Based Looping Materials in Thermochemical Energy Storage by Codoping Y and Mg [J]. | ACS APPLIED ENERGY MATERIALS , 2024 , 7 (24) : 12165-12173 . |
| MLA | Wang, Jifu et al. "Enhancing the Stability of CaO-Based Looping Materials in Thermochemical Energy Storage by Codoping Y and Mg" . | ACS APPLIED ENERGY MATERIALS 7 . 24 (2024) : 12165-12173 . |
| APA | Wang, Jifu , Xiong, Wei , Ding, Zhengxin , Wang, Pengzhao , Long, Jinlin . Enhancing the Stability of CaO-Based Looping Materials in Thermochemical Energy Storage by Codoping Y and Mg . | ACS APPLIED ENERGY MATERIALS , 2024 , 7 (24) , 12165-12173 . |
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Abstract ：
We report a facile yet effective strategy to prepare hierarchical Beta zeolite with high molecular transport effectivity in catalysis. Alkaline etching involves preferential desilication from Beta framework and collapse of microporosity. The preferential desilication from outer rim of Beta stacking faults enlarged intercrystallite mesopores, while the collapse of microporosity created cylindroid-like intracrystalline mesopore. Part of Altet with lower stability was removed during alkaline etching, leading to a decrease in acid sites density. Alkaline etching of Beta zeolite with 0.2 mol/L NaOH solution greatly improved n -hexane isomerization activity over Ptbased catalysts. The maximum yield of isohexane and dibranched isomers increased by 6.2 % and 38.6 %, respectively. The enlargement of intercrystallite mesopores and the generation of intracrystalline mesopores of Beta zeolite lowered apparent activation energy of reaction. The apparent diffusivities measurements further revealed that Pt/Beta-0.2 M showed much lower transport limitation than Pt/Beta-parent. Our findings provide a promising catalyst for industrial alkane isomerization.
Keyword ：
Alkaline etching Alkaline etching Alkane isomerization Alkane isomerization Dibranched isomers Dibranched isomers Diffusion barrier Diffusion barrier Mesoporous Beta zeolite Mesoporous Beta zeolite
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| GB/T 7714 | Wang, Pengzhao , Chen, Tingting , Qiu, Zihui et al. Pt-promoted mesoporous Beta zeolite catalysts for n-Hexane isomerization with enhanced selectivity to dibranched isomers [J]. | FUEL , 2024 , 368 . |
| MLA | Wang, Pengzhao et al. "Pt-promoted mesoporous Beta zeolite catalysts for n-Hexane isomerization with enhanced selectivity to dibranched isomers" . | FUEL 368 (2024) . |
| APA | Wang, Pengzhao , Chen, Tingting , Qiu, Zihui , Yao, Wenjun , Liu, Pengpeng , Zhang, Yongze et al. Pt-promoted mesoporous Beta zeolite catalysts for n-Hexane isomerization with enhanced selectivity to dibranched isomers . | FUEL , 2024 , 368 . |
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Abstract ：
轻质烷烃催化热裂解是生产乙烯和丙烯的重要途径。本工作采用水热合成法制备不同Al含量的MFI型分子筛，并采用水热合成法和机械球磨法分别制备了Ba掺杂的高硅ZSM-5分子筛催化剂，研究了其催化正丁烷热裂解反应性能。结果表明：高硅ZSM-5分子筛中Al含量的减少降低了催化剂表面酸性位的数量和强度，抑制了低碳烯烃通过氢转移反应生成烷烃副产物的活性，提高了低碳烯烃的收率。与低硅铝比的ZSM-5分子筛相比，高硅的ZSM-5分子筛表现出更高的低碳烯烃收率。向高硅ZSM-5分子筛中掺杂质量分数为1%的Ba可进一步弱化催化剂表面酸性，抑制氢转移反应，提高低碳烯烃收率。采用机械球磨法制备的Ba/ZSM-5催化剂上乙烯和丙烯的单程收率最高可达54.02%。
Keyword ：
MFI型分子筛 MFI型分子筛 丁烷 丁烷 低碳烯烃 低碳烯烃 催化热裂解 催化热裂解
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| GB/T 7714 | 王革 , 张永泽 , 曾土城 et al. MFI型分子筛在正丁烷催化热裂解制备低碳烯烃反应中的性能研究 [J]. | 化学反应工程与工艺 , 2024 , 40 (04) : 298-305 . |
| MLA | 王革 et al. "MFI型分子筛在正丁烷催化热裂解制备低碳烯烃反应中的性能研究" . | 化学反应工程与工艺 40 . 04 (2024) : 298-305 . |
| APA | 王革 , 张永泽 , 曾土城 , 刘云博 , 王鹏照 . MFI型分子筛在正丁烷催化热裂解制备低碳烯烃反应中的性能研究 . | 化学反应工程与工艺 , 2024 , 40 (04) , 298-305 . |
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Developing high-performance Ca-based materials that can work for long-term heat transfer and storage in concentrated solar power plants is crucial to achieve the large-scale conversion of solar photon fluxes to dispatchable electricity. This work demonstrates that a series of Mn, Zr co-doped CaCO3 nanomaterials with the 3D ordered macroporous (3DOM) skeletons are successfully prepared by a novel strategy of templated metal salt co-precipitation. The characterization results indicate that a majority of Zr and Mn are atomically dispersed into the highly-crystallized CaCO3 framework, whereas a minor amount of Mn is present in the form of CaMnO3 nanoparticles (NPs). The optimal 3DOM material made by templating with PS microspheres with a diameter of approximate to 350 nm, 3DOM-Ca80Mn10Zr10, shows a solar light absorptance of approximate to 74.1% and an initial energy storage density of 1706.4 kJ kg(-1). Importantly, it gives an impressive energy storage density loss of < 6.0% and maintains above 1600 kJ kg(-1) after 125 cycles. The density functional theory calculations reveal that the co-doping of Mn and Zr into the CaO crystal lattice offers a strong affinity to [Ca4O4] clusters, as a result, the anti-sintering of CaO NPs is significantly enhanced under high temperature.
Keyword ：
CaCO3 CaCO3 Ca-looping Ca-looping ordered macropores ordered macropores photonic crystals photonic crystals thermochemical energy storage thermochemical energy storage
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| GB/T 7714 | Li, Han , Lin, Jinfeng , Wu, Jianze et al. 3D Ordered Macroporous Mn, Zr-Doped CaCO3 Nanomaterials for Stable Thermochemical Energy Storage [J]. | ADVANCED SCIENCE , 2024 . |
| MLA | Li, Han et al. "3D Ordered Macroporous Mn, Zr-Doped CaCO3 Nanomaterials for Stable Thermochemical Energy Storage" . | ADVANCED SCIENCE (2024) . |
| APA | Li, Han , Lin, Jinfeng , Wu, Jianze , Wang, Jiashun , Wang, Pengzhao , Kang, Guojian et al. 3D Ordered Macroporous Mn, Zr-Doped CaCO3 Nanomaterials for Stable Thermochemical Energy Storage . | ADVANCED SCIENCE , 2024 . |
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The chemical enhancement of semiconductor-based surface-enhanced Raman scattering (SERS) substrates is an exciting hot topic. Herein, a simple hydrothermal method is developed to prepare molybdenum disulfide (MoS2), which can be easily exfoliated into monolayer nanosheets (MoS(2)NSs) by sonication, even in the absence of any surfactant. The obtained MoS(2)NSs contain two types of defects, namely, one caused by the incorporation of Mo atoms of high valence states and one caused by the incorporation of S-2(2-). The density of the two types of defects can be easily tuned by controlling the ratio of Na2S and Na2MoO4 in the raw materials. The unique properties and the clear surface make the obtained MoS(2)NSs ideal models to investigate the effect of defects on the SERS activity of MoS2. It is found that the SERS activity of the obtained MoS(2)NSs increases dramatically with the defects caused by Mo atoms of high valence states, while it first increases and then decreases with the increase of defects caused by S-2(2-). On the basis, MoS(2)NSs with high SERS activity and a low detection limit of 5.0 x 10(-9) mol/L toward crystal violet (CV) are obtained. Moreover, the mechanism of defects affecting the SERS activity of MoS(2)NSs is revealed. The defects on one hand provide a large amount of dangling bonds that can combine CV molecules to form MoS2NS-CV complex and on the other hand provide extensive induced local dipoles and enhance the overall SERS spectrum of CV.
Keyword ：
chemical enhancement chemical enhancement crystal violet crystal violet defects defects molybdenum disulfidenanosheets molybdenum disulfidenanosheets surface-enhanced Raman scattering surface-enhanced Raman scattering
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| GB/T 7714 | Fu, Xiaolong , Wu, Huiying , Liu, Zhihong et al. MoS2 Nanosheets as Substrates for SERS-Based Sensing [J]. | ACS APPLIED NANO MATERIALS , 2024 , 7 (4) : 3988-3996 . |
| MLA | Fu, Xiaolong et al. "MoS2 Nanosheets as Substrates for SERS-Based Sensing" . | ACS APPLIED NANO MATERIALS 7 . 4 (2024) : 3988-3996 . |
| APA | Fu, Xiaolong , Wu, Huiying , Liu, Zhihong , Wang, Pengzhao , Rong, Jiefeng , Fu, Fengfu et al. MoS2 Nanosheets as Substrates for SERS-Based Sensing . | ACS APPLIED NANO MATERIALS , 2024 , 7 (4) , 3988-3996 . |
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The isobutane/butene (I/O) ratio in the pore is a crucial factor for enhancing the catalytic stability of zeolitic catalysts in C4 alkylation process. In this work, the influence mechanism of the Si/Al ratio on the I/O ratio in the pore for H-BEA zeolite was investigated via CB-GCMC methods under realistic alkylation conditions. It is found that the I/O ratio in the pore decreases dramatically with decreasing the Si/Al ratio due to the higher adsorption heats of 1-butene over the acid sites than that of isobutane. Therefore, there will be an optimal Si/Al ratio for C4 alkylation, which is in good agreement with the experimental results. Furthermore, the relationship between the I/O ratio in the pore and feedstock over the H-BEA zeolite with different Si/Al ratios was built. We found that increasing the I/O ratio in the pore by improving the I/O ratio in the feedstock is limited, when the Si/Al ratio is much low. The external surface modification of catalyst will be an effective method to improve the I/O ratio in the pore. These results are of great significance to the rational design of high-efficiency C4 alkylation catalysts.
Keyword ：
Adsorption Adsorption Alkylation Alkylation Al ratio Al ratio I I O ratio O ratio Si Si Zeolite Zeolite
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| GB/T 7714 | Li, Shuo , Zhang, Xiaoqiang , Dong, Shijia et al. Insights into the effect of Si/Al ratio on Isobutane/1-butene ratio in the pore of H-BEA zeolite in C4 alkylation process [J]. | FUEL , 2023 , 348 . |
| MLA | Li, Shuo et al. "Insights into the effect of Si/Al ratio on Isobutane/1-butene ratio in the pore of H-BEA zeolite in C4 alkylation process" . | FUEL 348 (2023) . |
| APA | Li, Shuo , Zhang, Xiaoqiang , Dong, Shijia , Du, Yupeng , Chen, Xiaoping , Wang, Pengzhao et al. Insights into the effect of Si/Al ratio on Isobutane/1-butene ratio in the pore of H-BEA zeolite in C4 alkylation process . | FUEL , 2023 , 348 . |
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Abstract ：
Aiming at improving reaction selectivity of zeolite Beta-catalyzed isomerization of normal alkane, we reported a facile but efficient route to prepare the Beta@SBA-15 composite supports with low surface diffusion barriers in isomers formation from normal alkane. Microporous Beta zeolite and mesoporous SBA-15 zeolite were physically mixed and milled by high-energy planetary ball-mill. The addition of SBA-15 and milling, which have little effect on the acid properties of Beta zeolites, disaggregate the Beta particles and anchor the Beta nanocrystals on the surface of SBA-15 mesostructure. The apparent diffusivities of 2-methyl pentane measured by zero-length column method increased by 50%. n-Hexane isomerization tests show that the Pt/Beta@SBA-15 catalysts exhibit much higher selectivity to isomers, especially the dibranched isomers and lower selectivity to cracking reaction, owning to the reduced transport limitation of composite supports.
Keyword ：
Alkane isomerization Alkane isomerization Ball milling Ball milling Beta zeolite Beta zeolite Diffusion barriers Diffusion barriers SBA-15 addition SBA-15 addition
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| GB/T 7714 | Liu, Pengpeng , Qiu, Zihui , Shi, Huibing et al. Reducing the diffusion barriers of Pt/Beta catalyzed n-hexane isomerization by SBA-15 addition and high-energy milling [J]. | MICROPOROUS AND MESOPOROUS MATERIALS , 2023 , 356 . |
| MLA | Liu, Pengpeng et al. "Reducing the diffusion barriers of Pt/Beta catalyzed n-hexane isomerization by SBA-15 addition and high-energy milling" . | MICROPOROUS AND MESOPOROUS MATERIALS 356 (2023) . |
| APA | Liu, Pengpeng , Qiu, Zihui , Shi, Huibing , Song, Yu , Zhao, Deming , Wang, Pengzhao et al. Reducing the diffusion barriers of Pt/Beta catalyzed n-hexane isomerization by SBA-15 addition and high-energy milling . | MICROPOROUS AND MESOPOROUS MATERIALS , 2023 , 356 . |
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Abstract ：
采用共沉淀-浸渍法制备了系列硫酸负载催化剂Pt/SO42--(ZrO2-Al2O3),利用X射线衍射仪、物理吸附仪、红外光谱仪等对其进行了表征,并在固定床微型反应装置上对其催化异丁烷正构化反应性能进行了评价.结果表明:硫酸单层分散于载体表面,硫酸负载不利于四方晶相ZrO2长大;随着硫酸负载量的增加,催化剂介孔结构的有序性增强且孔径减小,孔径最小降为3.41 nm,孔容可提高至0.091 cm3/g,比表面积增至100m2/g以上;在反应温度为250℃的条件下,硫酸负载量为15％时,异丁烷转化率高达41.74％;硫酸负载量为2％时,正丁烷选择性最高为93.91％.
Keyword ：
Pt/SO42--(ZrO2-Al2O3) Pt/SO42--(ZrO2-Al2O3) 催化剂 催化剂 单层分散 单层分散 异丁烷 异丁烷 正构化 正构化 硫酸 硫酸 酸性位 酸性位
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| GB/T 7714 | 宋宇 , 辛靖 , 张海洪 et al. 硫酸负载对Pt/SO42-(ZrO2-Al2O3)催化剂性能的影响 [J]. | 石化技术与应用 , 2023 , 41 (4) : 251-255 . |
| MLA | 宋宇 et al. "硫酸负载对Pt/SO42-(ZrO2-Al2O3)催化剂性能的影响" . | 石化技术与应用 41 . 4 (2023) : 251-255 . |
| APA | 宋宇 , 辛靖 , 张海洪 , 曾土城 , 范文轩 , 王廷海 et al. 硫酸负载对Pt/SO42-(ZrO2-Al2O3)催化剂性能的影响 . | 石化技术与应用 , 2023 , 41 (4) , 251-255 . |
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Understanding the effect of acid strength on butene isomerization mechanisms is essential in C4 alkylation process. Herein, the double bond, trans-cis, and skeleton isomerization mechanisms of butene over acid sites with different acid strengths were investigated utilizing density functional theory (DFT) calculations. It is demon-strated that the acid strength significantly affects the isomerization mechanisms of butene. The stability of carbonium ions as reaction intermediates follows the order: tert-butyl cation > cis-butyl cation > trans-butyl cation, which is more sensitive to acid strength than that of butoxide species. Therefore, the reaction pathways of double bond and trans-cis isomerizations changed with varying the acid strength. Based on the analysis of activation energy barriers, it is found that 1-butene and 2-butene can be easily converted into each other over strong acid site. Thus, for reactants, C4 alkylation has no selectivity to 1-butene and 2-butene over strong acid site, which is consistent with experimental study. This work provides mechanistic insights into the relationship among acid strength, type of butene, and quality of alkylate in the C4 alkylation process.
Keyword ：
Acid strength Acid strength Alkylation Alkylation Butene Butene Density Functional Theory Density Functional Theory Isomerization mechanism Isomerization mechanism
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| GB/T 7714 | Zhang, Xiaoqiang , Li, Hao , Du, Yupeng et al. Elucidating effect of acid strength on isomerization mechanisms of butene over solid acid catalysts in C4 alkylation [J]. | FUEL , 2023 , 339 . |
| MLA | Zhang, Xiaoqiang et al. "Elucidating effect of acid strength on isomerization mechanisms of butene over solid acid catalysts in C4 alkylation" . | FUEL 339 (2023) . |
| APA | Zhang, Xiaoqiang , Li, Hao , Du, Yupeng , Chen, Xiaoping , Wang, Pengzhao , Wang, Lei et al. Elucidating effect of acid strength on isomerization mechanisms of butene over solid acid catalysts in C4 alkylation . | FUEL , 2023 , 339 . |
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The understanding of reaction mechanism is the key to develop the highly efficient catalyst. The introduction of Pt on SO42-/ZrO2 surface greatly improves its catalytic stability in n-butane hydroisomerization, but the function of Pt is still in controversy. The introduction of Pt on sulfated zirconia surface only promotes the hydrogenation of coke precursor and slows catalyst deactivation during n-butane hydroisomerization, but has no effect on the initial conversion rate of n-butane and selectivity to isobutane. H2-TPR and H2-TPD investigations reveal that Pt functions via hydrogen spillover mechanism, rather than classical bifunctional "metal-acid" catalysis mechanism. Our findings provide a new perspective for the rational design and synthesis of "metal-acid" bifunctional catalysts for alkane isomerization.
Keyword ：
Bifunctional catalysis Bifunctional catalysis Hydrogen spillover Hydrogen spillover N-butane isomerization N-butane isomerization Pt Pt SO42--ZrO2 SO42--ZrO2
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| GB/T 7714 | Wang, Pengzhao , Zeng, Tucheng , Yao, Wenjun et al. Role of Pt in Pt/SO42--ZrO2 catalyzed n-butane isomerization reaction: Hydrogen spillover rather than bifunctional "metal-acid" catalysis [J]. | MOLECULAR CATALYSIS , 2023 , 547 . |
| MLA | Wang, Pengzhao et al. "Role of Pt in Pt/SO42--ZrO2 catalyzed n-butane isomerization reaction: Hydrogen spillover rather than bifunctional "metal-acid" catalysis" . | MOLECULAR CATALYSIS 547 (2023) . |
| APA | Wang, Pengzhao , Zeng, Tucheng , Yao, Wenjun , Wang, Yaowei , Zhao, Deming , Zhang, Minxiu et al. Role of Pt in Pt/SO42--ZrO2 catalyzed n-butane isomerization reaction: Hydrogen spillover rather than bifunctional "metal-acid" catalysis . | MOLECULAR CATALYSIS , 2023 , 547 . |
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