Article
Energy & Fuels
Jie Wang, Junwei Shan, Yajie Tian, Tiantian Zhu, Haonan Duan, Xinyu He, Congzhen Qiao, Guozhu Liu
Summary: Fe modification of NS zeolite catalysts resulted in lower n-heptane cracking conversion but enhanced ethylene and propylene yields due to decreased acid content and restricted deep hydrogen transfer. The Fe@NS catalyst showed improved stability and higher light olefin yields compared to Fe/NS and parent NS catalysts.
Article
Chemistry, Applied
Fengqiu Chen, Jing Hao, Yueyang Yu, Dang-guo Cheng, Xiaoli Zhan
Summary: Hierarchical ZSM-5 zeolites with similar porous structures but different external acid strength were prepared through chemical vapor deposition (CVD) method. The results show that the external environment and micropores have different catalytic roles, and the weakening of acid strength is beneficial for suppressing specific reactions.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Applied
Jiale Zhu, Siyan Yan, Yuan Qian, Xuedong Zhu, Fan Yang
Summary: A novel fluffy-ball like ZSM-5 zeolite was synthesized by biphasic hydrothermal method and exhibited improved physicochemical properties and catalytic performance in hexane cracking reaction. The fluffy-ball like ZSM-5 possessed uniform morphology and higher pore volumes, leading to enhanced diffusion efficiency and suppressed side reactions. The catalyst demonstrated higher selectivities to light olefins and improved stability compared to conventional ZSM-5.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Applied
Hagos Birhane Asfha, Ashenafi Hailu Berta, Nayoung Kang, Danim Yun, Jaedeuk Park, Yong-Ki Park, Kiwoong Kim
Summary: In this study, a reaction mechanism of light straight run naphtha cracking over micro-spherical catalyst containing HZSM-5 was systematically investigated. The results showed that light paraffins and olefins were the primary products, and oligomerization and β-scission cracking dominated the secondary reactions. Experiments on single hydrocarbon feeds indicated that BTX formation proceeded via the formation of cycloalkanes and cyclo-olefinic intermediates. Temperature and space time influenced the product selectivity, with propylene selectivity increasing at lower temperatures and ethylene selectivity increasing at higher temperatures.
Article
Chemistry, Applied
Rui Feng, Bao Liu, Xiaoyan Hu, Xinlong Yan, Min Zhou
Summary: In this study, ammonia hydroxide was used as an alkaline source for the direct synthesis of HZSM-5 zeolites by SAC and DAC methods. It was found that the crystallization rate of HZSM-5 by DAC was considerably faster than that by SAC, and the catalytic performances were affected by the reactions of cracking products.
JOURNAL OF POROUS MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jianyu Sun, Yuhang Tian, Jifeng Cao, Qilun Huang, Zilin Fang, Zhenzhou Ma, Xu Hou, Enxian Yuan, Tingting Cui
Summary: This study explores the effects of ethanol on n-heptane catalytic cracking over HZSM-5 zeolites. Ethanol addition promotes alkene selectivity but accelerates HZSM-5 deactivation.
NEW JOURNAL OF CHEMISTRY
(2022)
Review
Chemistry, Multidisciplinary
Yuchen Sha, Lei Han, Ruoyu Wang, Peng Wang, Haitao Song
Summary: In recent decades, steam cracking of hydrocarbons has been the major process for producing light olefins. Recent studies have shown that modified ZSM-5 zeolite can be used for hydrocarbon cracking to produce significant amounts of propylene and ethylene. Various modification methods and post-treatment techniques have been employed to improve the catalytic performance of ZSM-5 zeolite.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Applied
Ne Ni, Xiuzhi Gao, Enhui Xing, Yuan Zhu, Jianqiang Liu, Mudi Xin, Ying Ouyang, Yibin Luo, Xingtian Shu
Summary: The promotional effects of phosphorus modification on ZSM-5 zeolites by different molecular sizes of phosphorus oxyacids (H4P2O7, H3PO4, H3PO3, and H3PO2) were studied using catalytic cracking of n-tetradecane as the probe reaction. The diffusion of P precursor molecules into ZSM-5 channels was found to be important for preventing aggregation of P species and improving stabilization on tetra-coordinated framework aluminum. The presence of P-Al interaction was proposed based on the results of 27Al, 31P, and 29Si MAS NMR. H3PO2 as the P precursor showed easy diffusion into ZSM-5 channels, resulting in less formation of polyphosphates, homogeneous distribution of P species, better reserved crystallinity, microporous area, and acidic sites, leading to improved cracking performance of n-tetradecane.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Feng Rui, Shen Jia-Ming, Liu Bao, Li Tian-Bo, Hu Xiao-Yan, Yan Xin-Long, Zhang Zhong-Dong
Summary: In this study, ZSM-5 zeolites with low silica-to-alumina ratios were synthesized using ammonia as a mineralizer and NH4+ cation as an additive. The effects of different sources of silicon, aluminum, mineralizer, and cation on the properties of the zeolites were investigated. The results showed that decreasing the silica-to-alumina ratio improved the conversion of n-heptane but decreased the selectivity of light olefins.
CHINESE JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Energy & Fuels
Qingjing Niu, Lisha Wei, Ruifeng Hou, Ling Zhang, Kun Hao, Caixia Hu, Xiaodong Wen, Hongwei Xiang, Zhichao Tao, Yong Yang, Yongwang Li
Summary: 3D zeolite with 10-membered ring channels has the advantage of increasing light olefins in catalytic cracking reactions. IM-5, ZSM-5, and ZSM-11 zeolites were synthesized hydrothermally to achieve similar texture properties and SiO2/Al2O3 ratios. The acid content and strength were IM-5 > ZSM-5 > ZSM-11. IM-5 zeolite showed a synergistic effect between Bronsted and Lewis acids. However, it had unexpectedly low TOF in n-heptane cracking. The selectivity of light olefins was IM-5 > ZSM-11 > ZSM-5, with IM-5 zeolite having a particular advantage in ethylene production.
Article
Energy & Fuels
Qitong Cheng, Benxian Shen, Jichang Liu, Xinglong Qin, Lei Ye, Biao Xing
Summary: The study focused on the naphtha-methanol coupling conversion catalyzed by HZSM-5, with a structured lumping (SOL) kinetic model developed to predict product distributions. Significant improvements in naphtha conversion rate and light olefin yield were achieved using this approach.
Article
Chemistry, Multidisciplinary
Jiale Zhu, Fan Yang, Siyan Yan, Haidan Wu, Xuedong Zhu
Summary: In this study, core-shell structure catalysts with different shell thicknesses were fabricated using hydrothermal coating. Multiple characterization technologies were employed to analyze the physicochemical properties of the catalysts. It was found that controlling the shell thickness to 150 nm resulted in the best performance, with higher olefins yields and improved catalyst lifetime.
Article
Energy & Fuels
Chanon Auepattana-aumrung, Supareak Praserthdam, Sippakorn Wannakao, Bunjerd Jongsomjit, Joongjai Panpranot, Piyasan Praserthdam
Summary: Transition metal-loaded catalysts enhance propylene selectivity and improve hydrogen transfer reaction; Lack of strong acid sites on ZSM-5 is a significant factor suppressing the formation of light alkanes; Na-ZSM-5 exhibits the best performance in propylene yield and catalyst stability.
Article
Engineering, Chemical
Yu -Ling Zhang, Cheng-Wei Liu, Xue-Gang Li, Wen -De Xiao
Summary: This study revisited the kinetics of light olefins (C3-C7) interconversion over commercial ZSM-5 catalyst and investigated the effect of steam treatment. Comparative analysis was conducted between the pristine and steam-treated catalysts in terms of acid property, catalytic activity, and deactivation behavior. A rational and reliable kinetic model for olefins interconversion and a temporal kinetic model for catalyst deactivation were established, providing kinetic foundations for the design and retrofit of MTO or MTP reactors.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Engineering, Chemical
Xiaoxue Zhang, Shuman Xu, Jing Hao, Xiaojin Xie, Fengqiu Chen, Dang guo Cheng
Summary: Hierarchical ZSM-5 zeolites with different particle sizes were prepared and investigated in the n-heptane catalytic cracking reaction. The study showed that the reduction of particle size resulted in a decrease in the apparent diffusivities of n-heptane, indicating the presence of surface barriers. Despite the change in surface barriers, intracrystalline diffusion still dominated the overall diffusion. Moreover, smaller particle size zeolites exhibited better stability in catalytic performance.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Ming-Yi Chen, Ngoc Thanh Thuy Tran, Ahmed Abubakar Alao, Wen-Dung Hsu
Summary: This study demonstrates the significance of surface Pt atom arrangement for the efficiency of ORR in PEMFCs and reveals the correlation between Pt-Pt average distance and O2 dissociation barrier. Furthermore, the study discovers a robust correlation between the level of the catalyst's d-band center and O2 adsorption energy. High-entropy alloy substrates provide potential for controlling Pt arrangement and O2 dissociation barrier.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Eduardo C. Atayde Jr, Babasaheb M. Matsagar, Yu-Cheng Wang, Kevin C. -W. Wu
Summary: This study presents the first application of an acidic MOF, Sulfated MOF-808, in catalyzing the HAA reactions of furan oligomers for the production of biofuel precursors. The catalyst showed high yield, selectivity, and recyclability, making it versatile for different starting materials.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Maria do Carmo Rangel, Francieli Martins Mayer, Soraia Jesus de Oliveira, Sergio Gustavo Marchetti, Fabricio Luiz Faita, Doris Ruiz, Giovanni Saboia, Mariana Kieling Dagostini, Jonder Morais, Maria do Carmo Martins Alves
Summary: This study developed a new catalyst by investigating the effect of magnesium on the catalytic properties of hematite in ethylbenzene dehydrogenation. The catalyst showed important differences in activity, selectivity, and stability, making it a promising candidate for commercial applications.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yanjun Li, Qian Wang, Hui Tian, Mingyuan Zhu, Yuanyuan Liu
Summary: A novel strategy using microwave-assisted precipitation was proposed to prepare defective CsH3PMo11VO40 catalyst for the oxidation of methacrolein to methacrylic acid. Microwave treatment accelerates crystallization, increases vanadyl species content, and forms defective Keggin structures, thereby enhancing the oxidation capacity of the catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Rajeshwari Athavale, Sailee Gardi, Fatima Choudhary, Dayanand Patil, Nandkishor Chandan, Paresh More
Summary: In this study, a novel acidic ionic liquid catalyst was prepared and used for the synthesis of bis-indolyl methane derivatives. The catalyst exhibited short reaction times, easy purification, and reusability.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Masatomo Hattori, Takato Hattori, Masakuni Ozawa
Summary: Cu-added gamma-Al2O3 catalysts were prepared with varying Cu loadings and the effects of copper oxidation states on catalytic activity were investigated. The results showed that the addition of copper increased the catalyst activity, but excessive copper loading decreased catalytic activity. XRD and TEM analysis indicated the formation of a solid solution of copper oxide species on the surface of gamma-Al2O3. XAS and TPR data demonstrated variations in copper oxidation states among the catalysts.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liwei Fang, Shiyang Niu, Shengsen Wang, Yiqing Lu, Yuanhui Cheng
Summary: In this study, PtNi alloy on nitrogen-doped carbon and SnO2 dual-support was designed to modulate the metal-support interaction, resulting in improved catalytic activity and stability for oxygen reduction reaction. The SnO2/PtNi/NC catalyst exhibited a strongly coupled interface, enhanced electron transfer, and higher half-wave potential compared to PtNi/NC and commercial Pt/C.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Shohei Harada, Duanxing Li, Kenta Iyoki, Masaru Ogura
Summary: This study investigates the catalytic performance of a composite catalyst composed of ZnZrOX and H-zeolite for the hydrogenation of CO2. The deactivation of the composite catalyst is influenced by ion exchange of Zn2+ and/or coke, with their effects differing based on the zeolite structure. Separating the grains of the composite catalyst can prevent deactivation.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Laura Proano, Christopher W. Jones
Summary: In this study, NiGa alloy particles supported on CeO2, ZrO2, and ZrO2-CeO2 solid solutions were prepared and characterized. The nature of the support was found to have a significant influence on the catalyst's activity and selectivity, with the crystalline structure of ZrO2 having the greatest impact. Pure ZrO2 showed the highest methanol selectivity and CO2 conversion at high Zr:Ce ratios. In equimolar and Ce-rich conditions, basic sites and oxygen vacancies were found to be the key parameters affecting methanol production.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liyan Zhang, Yinze Yang, Leilei Zhou, Fengyu Zhao, Haiyang Cheng
Summary: 1,6-Hexamethylenediamine was successfully synthesized via the reductive amination of 1,6-hexanediol using a Ru/PRL(x)-Al2O3 catalyst. The highly dispersed and anchored Ru species, formed by 1,10-phenanthroline (PRL), played a crucial role in the catalytic reaction. The formation of new acid-base pairs, electron deficient Ru species, and smaller nanoparticles contributed to the improved catalytic performances of the Ru/PRL-Al2O3 catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Anita Horvath, Miklos Nemeth, Andrea Beck, Gyorgy Safran, Valeria La Parola, Leonarda Francesca Liotta, Gregor Zerjav, Matevz Roskaric, Albin Pintar
Summary: This study investigates the catalytic and structural changes caused by the addition of 0.25 wt% indium in a 3% Ni/CeO2-Al2O3 catalyst prepared by impregnation method. The results show that the addition of indium can decrease the activity of the catalyst, but it improves its stability and reduces coking.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Ankush Kularkar, Vaibhav Vilas Khedekar, Sachin D. Chaudhari, Mudavath Ravi, Sadhana S. Rayalu, Penumaka Nagababu
Summary: Efficiently addressing the challenges of photocatalytic CO2 reduction to CH3OH is crucial. This study developed Zn-BTC MOF and its composites with CaIn2S4, achieving highly efficient and robust photocatalytic CO2 reduction to CH3OH under ambient conditions, using H2O2 as the hydrogen source. Among the composites, ZMCIS4 demonstrated excellent performance with a CH3OH evolution of 49100 μmol/g.cat and a quantum efficiency of approximately 78.41%. The enhanced performance was attributed to the production of nascent hydrogen atoms (H center dot) through the photo-splitting of H2O2 on the ZMCIS surface.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Dan Liu, Yudong Li, Chengyu Wang, Haiyue Yang, Rong Wang, Shujun Li, Xiaohui Yang
Summary: In this study, a self-supporting three-dimensional porous Co3O4 nanobelt array decorated on nickel foam (P-Co3O4 -NBA@NF) electrode with numerous active sites was successfully constructed for the oxidation of 5-Hydroxymethylfurfural (HMF) to 2,5-furan dicarboxylic acid (FDCA). The P-Co3O4 -NBA@NF electrode demonstrated high conversion efficiency, selectivity, and Faraday efficiency, as well as remarkable long-term stability. This research provides a promising electrocatalyst for biomass conversion.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yimin Li, Enggah Kurniawan, Fumiya Sato, Takayoshi Hara, Yasuhiro Yamada, Satoshi Sato
Summary: In this study, several silica-alumina catalysts modified with Ag were examined for the dehydration of 1,3-butanediol to 1,3-butadiene. Among them, an amorphous silica-alumina catalyst (SAL-3) modified with Ag showed the highest improvement in catalytic activity and stability when operated in H2 flow. The generation of reversible acid sites was found to be the reason behind the enhanced activity and stability of this Ag/SAL-3 catalyst. The effects of various parameters on the catalytic activity of Ag/SAL-3, such as reaction temperature, contact time, Ag content, and carrier gas, were investigated.
APPLIED CATALYSIS A-GENERAL
(2024)