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
Energy & Fuels
Hou Xu, Zhao Liu, Ma Zhenzhou, Chen Bochong, Feng Jingyuan, Cui Tingting
Summary: This study focused on the catalytic cracking of n-pentane over HZSM-5 zeolites, revealing that adjusting operating conditions could enhance the catalytic stability of HZSM-5 zeolites while reducing the decrease in alkenes selectivity. Increasing the carrier gas flow rate was found to be the most effective way to improve catalytic stability with minimal impact on alkenes selectivity compared to other operating condition adjustments.
CHINA PETROLEUM PROCESSING & PETROCHEMICAL TECHNOLOGY
(2021)
Review
Chemistry, Multidisciplinary
Yitong Zhai, Beibei Feng, Qinghui Meng, Chengcheng Ao, Siyu Qian, Lidong Zhang
Summary: This feature article discusses the catalytic combustion of methyl butanoate over unmodified HZSM-5 zeolites, focusing on the catalytic reaction mechanism. Experimental and theoretical calculations are used to explain the proposed catalytic mechanism, providing new insights into improving combustion efficiency in internal combustion engines and controlling pollutant emissions.
CHEMICAL COMMUNICATIONS
(2021)
Article
Energy & Fuels
Di Rong, Jiaqi Zhang, Hao Li, Wen Guo, De Sun, Zhenheng Diao
Summary: Hierarchical HZSM-5 zeolite coatings were fabricated on the inner wall of stainless-steel tubes by ammonia-assisted vertical secondary growth, using amphiphilic organosilane as a meso-porogen. The coating structure broke the trade-off between diffusion and acidity, and the synthesis mechanism of the coatings was speculated by adjusting the dosage of inorganic ammonium salt and the crystallization time. The macro-meso-HZSM-5 coating exhibited an excellent catalytic conversion and stability for cracking of supercritical n-dodecane, due to the combination of improved diffusion property and suitable acidity.
Article
Energy & Fuels
Jing-Ping Zhao, Jing-Pei Cao, Fu Wei, Nai-Yu Yao, Feng Chen, Xin-Bo Pang, Shi-Jie Cai, Feng-Jiao Yi, Xiao-Bo Feng, Xiao-Yan Zhao
Summary: This research investigated the impact of the physical properties of urea-desilicated HZSM-5 catalyst on upgrading lignite pyrolysis volatiles into aromatics. Mild urea treatment enhances the generation of secondary mesopores and Brønsted acid sites while preserving micropores. These modifications promote the diffusion and cleavage of macromolecules into smaller fragments and ensure shape selectivity for aromatic formation. Urea-desilicated catalysts exhibit improved performance compared to parent HZSM-5, particularly in the production of benzene and toluene. However, excessive desilication leads to a significant decrease in aromatic yield due to the loss of micropores, mesopores, and Brønsted acid sites.
Article
Energy & Fuels
Haifeng Tian, Jiapeng Jiao, Haizhou Tian, Huanhuan He, Fei Zha, Xiaojun Guo, Xiaohua Tang, Yue Chang
Summary: Methanol to aromatics (MTA) is an effective method to produce aromatics through a non-petroleum route, with the acidity and structure of zeolite catalysts being key factors. Different preparation methods and Zn sources significantly influenced the products distribution in the MTA reaction. Steam-assisted crystallization method was found to improve the crystallinity and pore structure of the ZnZ8 catalyst.
Article
Energy & Fuels
Muhammad Nadeem Amin, Ashfaq Ahmed, Yi Li, Chunshan Li, Suojiang Zhang, Muhammad Ammar, Young-Kwon Park
Summary: The catalytic effect of Mg/HZSM-5 in fast pyrolysis of low-rank coal and coal tar conversion was found to reduce total tar yield, increase the yield of light tar, and decrease the content of elements N and S in the resulting coal tars.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Applied
Tomas Cordero-Lanzac, Cristina Martinez, Andres T. Aguayo, Pedro Castano, Javier Bilbao, Avelino Corma
Summary: This study investigates the synergies between oxygenates (especially dimethyl ether) and n-pentane at low OX/nC(5) ratios, enhancing n-pentane conversion while reducing catalyst coking rate. The analysis of used catalysts reveals that dimethyl ether exhibits higher reactivity than methanol in forming coke structures.
Article
Chemistry, Physical
Tingting Yan, Mengting Zhang, Runze Liu, Weili Dai, Naijia Guan, Landong Li
Summary: The selective conversion of the acetone-butanol-ethanol (ABE) mixture to high-valuable chemicals is still challenging. In this study, a bifunctional Ga/HZSM-5 zeolite catalyst containing both Bri nsted acid sites and Lewis acid sites was designed and used for the conversion of the ABE mixture to aromatics, achieving a state-of-the-art aromatics yield of 77%. The mechanisms of aromatics formation and catalyst deactivation were investigated, and a synergistic catalysis between Lewis acidic Ga species and Bri nsted acid sites was proposed.
Article
Chemistry, Analytical
Yi Wei, Xiying Jia, Chaoyue Shen, Huijuan Ying, Fengwen Yu, Jianbing Ji
Summary: The digestate residue has been successfully utilized as feedstock for molten carbonates pyrolysis and catalytic reforming, producing bio-based monophenols. The modified HZSM-5 catalyst shows outstanding selectivity for monophenols and low coke yield, making it ideal for integrated pyrolysis systems. Additionally, the formation of mesopores minimizes diffusion hindrance and reduces coke accumulation during the process.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Energy & Fuels
Jing-Ping Zhao, Jing-Pei Cao, Fu Wei, Zi-Meng He, Nai-Yu Yao, Xiao-Bo Feng, Tian-Long Liu, Ze-Ying Wang, Xiao-Yan Zhao, Xian-Yong Wei
Summary: Appropriate AlF3 modification can enhance the catalytic performance of HZSM-5, leading to increased yield of light aromatics. However, excessive AlF3 can result in framework Al loss and reduction in acid sites. The one-step modification strategy combining pore size expansion and acid sites optimization provides a promising approach for upgrading lignite pyrolysis volatiles.
Article
Chemistry, Applied
Yajie Tian, Bofeng Zhang, Siyuan Gong, Li Wang, Xiangwen Zhang, Congzhen Qiao, Guozhu Liu
Summary: Pillared nanosheet HZSM-5 zeolite films prepared using a dual template method exhibited higher surface area, mesoporous volume, heat sink, and catalytic stability compared to conventional microporous zeolite films, leading to improved thermal management and high conversion rates.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Engineering, Chemical
Zhenzhou Ma, Xu Hou, Bochong Chen, Liu Zhao, Enxian Yuan, Tingting Cui
Summary: The study aimed to investigate the features and models of coke formation and catalyst deactivation during n-heptane catalytic cracking over HZSM-5 zeolites. 18 tests were conducted under various operating conditions to measure conversion, product distribution, coke content, and the properties of HZSM-5 zeolites. It was found that alkene and aromatic promoted coke formation, which affected the performance of n-heptane catalytic cracking. A quantitative relationship between HZSM-5 zeolites, conversion, product distribution, and coke formation was established, and a dual-model was proposed for process simulation.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Xinyang Zhang, Yue Li, Jiarong Lu, Yuhang Hu, Junfeng Chen, Delun Ren, Ze Li, Qingchao Zhang, Hao Yan, Xiaobo Chen, Yibin Liu, Chaohe Yang
Summary: This study systematically investigated the reaction mechanism of n-pentane cracking on the Ag/ZSM-5 bifunctional catalyst and found the roles of metal dehydrogenation sites and acid sites. The synergy of these two active sites successfully reduced the activation energy of cracking and increased the proportion of targeted products.
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, 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)
Article
Energy & Fuels
Hongwei Li, Yutong Wang, Li Wang, Xiangwen Zhang, Guozhu Liu
Summary: Under supercritical conditions, decalin can act as a hydrogen donor to suppress coke deposition and promote the pyrolysis and conversion of JP-10, while reducing the formation of polycyclic aromatic hydrocarbons.
Article
Nanoscience & Nanotechnology
Chunyu Zhang, Chan Wu, Li Wang, Guozhu Liu
Summary: The controllable synthesis of specific defective carbon catalysts is essential for the two-electron oxygen reduction reaction (2e- ORR) to generate H2O2. In this study, Mo-CDC-ns, a type of defective carbon catalyst, was successfully prepared by electrochemical activation. The Mo-CDC-ns catalyst exhibited increased kinetic current density and selectivity for H2O2 generation compared to the parent Mo2C/C catalyst, and its defect types were identified as edge defect and vacancy defect sites. Theoretical calculations showed that the defective structure of Mo-CDC-ns had a moderate reaction free energy and smaller energy barrier for 2e- ORR.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Analytical
Baokang Xu, Yutong Wang, Guozhu Liu
Summary: In this study, the reactive force-field molecular dynamics (ReaxFF-MD) simulation was used to investigate the palladium-catalyzed pyrolysis and steam reforming of n-dodecane (n-C12H26). The results showed that pyrolysis reaction supplied C1 and C2 components, and participated in steam reforming to generate aldehyde groups. Compared to catalytic pyrolysis, catalytic steam reforming reduced carbon atoms deposited inside the palladium lattice and improved the heat sink. Furthermore, the proportion of steam reforming increased with more H2O and the contribution of H atoms indicated the variation in the proportion of steam reforming.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Review
Chemistry, Physical
Junde Wei, Jieyi Liu, Weihao Zeng, Zichen Dong, Jingkuo Song, Sibao Liu, Guozhu Liu
Summary: Plastic waste is a significant environmental threat and economic loss. Catalytic hydroconversion processes have attracted attention for their ability to convert plastic waste into valuable products under mild reaction conditions. This review focuses on recent advances in catalytic hydroconversion processes for converting plastic waste into fuels and chemicals. The review summarizes and exemplifies the hydrocracking and hydrogenolysis of polyolefins, as well as the hydrogenolysis and hydrodeoxygenation of heteroatom-containing plastics. The review also highlights progress in catalyst design, reaction mechanisms, and the impact of key factors on catalytic performance.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Siying Liu, Yajie Tian, Xinyu He, Yong Liu, Congzhen Qiao, Guozhu Liu
Summary: A dual-template method was used to prepare hierarchical ZSM-5 zeolite for catalytic cracking of n-pentane. The synthesized zeolite had adjustable proportions of micropores to mesopores by regulating the content of tetrapropylammonium hydroxide and tetrabutylphosphonium hydroxide. The prepared catalyst exhibited high yield of light olefins and excellent catalytic stability.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Enxian Yuan, Meixia Zhou, Panming Jian, Xu Hou
Summary: Atomically-dispersed and high-loading Co on graphitic carbon nitrogen were synthesized and used as catalyst for solvent-free aerobic oxidation of cyclohexane. The catalyst showed high stability and catalytic performance, demonstrating good universality for the oxidation of various cycloalkanes and alkyl aromatics.
APPLIED SURFACE SCIENCE
(2023)
Article
Energy & Fuels
Ting Wang, Sibao Liu, Li Wang, Guozhu Liu
Summary: Catalytic steam reforming of toluene was investigated using Rh/CeO2 catalysts prepared by different methods. The Rh/CeO2(LDP-1) catalyst prepared by L-lysine assisted deposition precipitation method exhibited excellent catalytic activity, stability, and resistance to carbon deposition. The superior performance was attributed to the enhanced Rh dispersion, surface Rh0 content, and concentration of surface oxygen vacancy. A dual-site functional catalyst mechanism involving the -CHO group as a key intermediate for gas products generation was proposed. This study highlights the advantages of L-lysine-assisted deposition precipitation method for preparing highly active and stable metal-based catalysts for steam reforming reactions.
Article
Engineering, Chemical
Mingxia Song, Bofeng Zhang, Ziwei Zhai, Sibao Liu, Li Wang, Guozhu Liu
Summary: Atomically dispersed metal catalysts can maximize metal utilization and provide unique chemical properties. Self-pillared nanosheet-supported metal catalysts, such as PtZn/SP-S-1, exhibit high stability and specific activity, with no obvious deactivation after 90 hours at high temperature. They have potential to guide high-temperature catalysis.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Nanoscience & Nanotechnology
Yutong Wang, Guozhu Liu
Summary: This study investigated the mechanism of Pd-Pt alloy catalyst in the dehydrogenation of PHAN using density functional theory. The results showed that PdPt-(111) catalyst had advantages in PHAN dehydrogenation due to lower energy barrier and more stable dehydrogenation products. In addition, a method for selecting the minimum active unit of PdPt catalyst was proposed, and a correlation model among Pd-Pt surface characteristics, catalytic activity, and adsorption energy was established.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Enxian Yuan, Changlong Wang, Chan Wu, Guojun Shi, Panming Jian, Xu Hou
Summary: This study constructs a Pd-Co interface in cobalt oxide-supported Pd catalysts to tailor the d-band center of Co and enhance the catalytic performance for furfural hydrogenation. Experimental and theoretical calculations demonstrate that the electron transfer from Pd to Co at the interface leads to the destabilization of H and furan ring adsorption on the Co surface. By optimizing the catalyst structure, the furfural conversion rate and overall selectivity for cyclopentanone/cyclopentanol are significantly improved.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Chenggong Song, Xu Hou, Hao Zhou, Huimin Qiao, Li Yin, Jing Huang, Enxian Yuan, Tingting Cui
Summary: Plastic waste management and disposal has become a significant environmental concern. This study focuses on the use of catalysts, specifically introducing mesopores into HZSM-5 zeolites, to enhance catalytic activity and decrease the degradation temperature of plastic waste. The results demonstrate that mesopore volume has a positive impact on degradation efficiency.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Ziwei Zhai, Bofeng Zhang, Yutong Wang, Li Wang, Sibao Liu, Guozhu Liu
Summary: The vacancies and oxygen-containing groups in nanocarbons can enhance the catalytic performance of supported Pt clusters in propane dehydrogenation. In this study, nanocarbons with coexisting vacancies and oxygen-containing groups were designed and their influences on PDH were investigated by density functional theory calculations. Nanocarbons with divacancies and C=O edge groups were found to be the most suitable support for Pt clusters in PDH, resulting in enhanced binding strength and improved stabilization of Pt clusters.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Yutong Wang, Guozhu Liu
Summary: This study provides an atomic-level understanding of the effects of inhomogeneity on reactions in supercritical fluids, using the example of n-decane pyrolysis. The researchers explain the inhomogeneity as the coexistence of gas-like and liquid-like atoms and show that the presence of liquid-like atoms significantly increases the type and frequency of bimolecular reactions, leading to changes in product distributions.
Article
Chemistry, Multidisciplinary
Zhenzhou Ma, Xu Hou, Bochong Chen, Liu Zhao, Enxian Yuan, Tingting Cui
Summary: This study reveals the effects of molecular structure on the catalytic cracking of n-hexane, 1-hexene, cyclohexane, and cyclohexene over HZSM-5 zeolites. The results show that different molecular structures have significant impacts on the conversion rate, product distribution, and catalytic stability. Analysis of the cracking products indicates that the C=C bond and cyclic structure play important roles in coke formation, as well as the formation of alkenes and aromatics.
REACTION CHEMISTRY & ENGINEERING
(2022)
