Article
Chemistry, Analytical
Qing-Lin Li, Rui Shan, Jun Zhang, Ming Lei, Hao-Ran Yuan, Yong Chen
Summary: Pyrolytic catalysis technology is an effective strategy to convert waste plastics into high-value products. The design of efficient catalysts is crucial for the product distribution. In this study, a Ni-supported hierarchical ZSM-5 catalyst was developed for the pyrolytic catalysis of polyethylene to produce carbon nanotubes and hydrogen. The results showed that the Ni/ZSM-5 catalyst exhibited high carbon material yield and hydrogen production, making it a promising method for the production of valuable CNTs and hydrogen from waste plastics.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(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, Physical
Sara Ansari, Mojgan Zendehdel
Summary: Multi-walled carbon nanotubes (MWNTs) were functionalized with carboxylic acid groups (MWCNTs-(COOH)n), and ZSM-5 zeolite was modified with amino-propyltriethoxysilane (APTES). A micro-meso structured composite ZSM-5@MWCNT was obtained by the reaction between modified MWNTs and ZSM-5. The ZSM-5@MWCNT catalyst exhibited high efficiency for esterification reactions, and could be recycled for at least five cycles without significant loss of activity.
Article
Engineering, Environmental
Shangfeng Li, Hao Yan, Yibin Liu, Xiaobo Chen, Xin Zhou, Xiang Feng, Chaohe Yang
Summary: Metal doped ZSM-5 catalysts have been extensively studied for their unique catalytic activity in C-H bond activation. In this work, we used density functional theory calculations and microkinetic analysis to explore the catalytic activity of 12 transition metal single-atom-doped ZSM-5 zeolite catalysts in the catalytic cracking of naphtha. Our results show a strong electronic interaction between the metal atom and ZSM-5 skeleton, leading to a stable structure that enhances hydrocarbon adsorption and promotes C-H bond activation and carbenium ion cracking. Carbon and hydrogen binding energy were identified as descriptors for catalytic activity.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Yuen Bai, Guohao Zhang, Dongyang Liu, Yuhao Zhang, Liang Zhao, Jinsen Gao, Chunming Xu, Qingfei Meng, Xuhui Gao
Summary: This article highlights the current research progress on acid-catalyzed paraffin cracking for high yields of propylene and ethylene over modified ZSM-5 zeolite. Factors influencing the catalytic pyrolysis process, such as modified elements, post-treatment methods, and process conditions, are discussed. The effects of these factors on the production of light olefins and the catalytic pyrolysis mechanism are summarized, looking forward to future development in this field.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Biochemistry & Molecular Biology
Mihail Mihaylov, Elena Ivanova, Videlina Zdravkova, Stanislava Andonova, Nikola Drenchev, Kristina Chakarova, Radoslav Kefirov, Rositsa Kukeva, Radostina Stoyanova, Konstantin Hadjiivanov
Summary: This study explores the potential of Cu/ZSM-5 as an adsorbent for the purification of hydrogen from CO. The results show that Cu/ZSM-5 has high selectivity for CO adsorption. The samples prepared by different methods, aqueous solution cation exchange and solid-state exchange, exhibit different Cu ion contents, but both demonstrate good CO adsorption performance. The findings of this study are significant for hydrogen purification.
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, Physical
Leyan Liu, Xudong Zhang, Xin Xie, Jialin Cai, Jie Ding, Qiang Cai, Yushan Liu, Siyu Lu
Summary: In this study, a hierarchical Ru/MoO2/carbon nanotubes hybrid was prepared by a solid-phase reaction method and exhibited excellent performance for the electrochemical hydrogen evolution reaction (HER) in alkaline electrolyte.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Huimin Zhao, Guanyun Gao, Yanling Wang, Ruixin Chen, Yunmei Du, Minghui Wang, Zhenjiang Li, Yanru Liu, Lei Wang
Summary: In this study, a N-doped CoP electrocatalyst coated with carbon nanotubes (CoP@NC) was successfully synthesized. By optimizing the electronic structure and improving the charge transfer rate, the catalyst exhibited excellent catalytic performance under both acidic and alkaline conditions, providing an efficient approach for optimizing electrocatalyst performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Aniz Chennampilly Ummer, Muhammad Naseem Akhtar, Essa Alnaimi, Lianhui Ding, Hassan Saeed Alasiri
Summary: The aromatization of commercial full range naphtha was studied using synthesized hierarchical zeolite catalysts in a fixed bed reactor. Experimental results showed that desilicated catalysts exhibited higher aromatic selectivity and lower off-gas generation during the aromatization process compared to their non-desilicated counterparts.
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
Electrochemistry
Leyla Gidi, Roxana Arce, Jose Ibarra, M. Isaacs, M. J. Aguirre, Galo Ramirez
Summary: The mixed electrocatalyst of MWCNT/IL demonstrated high electrocatalytic activity in hydrogen evolution reaction, along with good stability. Compared to other electrocatalysts, it showed a higher TON value and a close to 60% faradaic efficiency.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Multidisciplinary
Reeya Garg, Mohit Jaiswal, Kaustubh Kumar, Komalpreet Kaur, Bhawna Rawat, Kamalakannan Kailasam, Ujjal K. Gautam
Summary: This study investigates an efficient composite material based on carbon nanostructures and non-noble metals, which exhibits high half-wave potential and electrocatalytic performance. The enhanced activity is attributed to the synergistic effect of high conductivity of carbon nanotubes and active Fe sites. In situ growth of CNTs prevents mass loss during catalyst material synthesis.
Article
Chemistry, Multidisciplinary
Reeya Garg, Mohit Jaiswal, Kaustubh Kumar, Komalpreet Kaur, Bhawna Rawat, Kamalakannan Kailasam, Ujjal K. Gautam
Summary: Achieving high electrocatalytic performance using a composite material of carbon nanotubes and non-noble metals can minimize metal loss and retain a high metal content, leading to efficient electrocatalysis.
Article
Nanoscience & Nanotechnology
Jian Chen, Yuan Ha, Ruirui Wang, Yanxia Liu, Hongbin Xu, Bin Shang, Renbing Wu, Hongge Pan
Summary: In this study, a highly active and durable multicomponent catalyst for the hydrogen evolution reaction (HER) was developed. The catalyst, consisting of cobalt nanoparticles confined inside bamboo-like carbon nanotubes (CNTs) and ultralow ruthenium loading on the exterior walls, exhibited exceptional HER activity. The atomic-scale structural investigations and theoretical calculations revealed that the confined inner cobalt and loaded outer ruthenium induced charge redistribution and synergistic electron coupling, optimizing the adsorption energy of H intermediates and facilitating electron/mass transfer. The results demonstrated that the Co@CNTs | Ru catalyst achieved top-level catalytic activity among all reported HER catalysts. This work provides new insights for the rational design of carbon-supported metal catalysts for practical applications.
NANO-MICRO LETTERS
(2022)
