Article
Chemistry, Organic
E. M. Smirnova, D. P. Melnikov, N. R. Demikhova, M. I. Rubtsova, S. S. Boev, E. E. Brindukova, A. P. Glotov, V. A. Vinokurov
Summary: By investigating the properties and conditions of the methanol conversion catalyst, it was found that the catalyst based on halloysite aluminosilicate nanotubes exhibited high selectivity in the formation of lower olefins and aromatic hydrocarbons.
PETROLEUM CHEMISTRY
(2021)
Article
Engineering, Chemical
Grandprix Thomryes Marth Kadja, Noerma Juli Azhari, St Mardiana, Munawar Khalil, Subagjo, Muhammad Haris Mahyuddin
Summary: Hierarchical ZSM-48 is synthesized at a faster rate by inducing the formation of hydroxyl radicals, leading to one-dimensional crystal growth and the formation of nanorod crystals, which facilitates the formation of larger aggregates and results in improved catalytic performance.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Applied
V. P. Doronin, O. Potapenko, T. P. Sorokina, P. Lipin, K. Dmitriev, K. S. Plekhova, D. O. Kondrashev, A. Kleimenov
Summary: This paper describes the characteristics of cracking catalysts produced by aluminosilicate technology and approaches to designing them for processing various types of feedstock. It also presents methods for modifying catalyst components and reducing catalyst activity in hydrogen transfer reactions. The achievable olefin yields on the described catalysts are 35% and 50% for heavy and light feedstock types, respectively, with consideration of the influence of feedstock hydrotreating degree on light olefin yield.
Article
Materials Science, Ceramics
Dipobrato Sarbapalli, Xu Chen, Leslie Struble, Paramita Mondal
Summary: This study investigates the impact of salicylic acid and methanol on geopolymer gels and sodium aluminosilicate hydrates. The findings show that SAM solution can dissolve aluminosilicate hydrates, with zeolite A being completely dissolved, zeolite X partially dissolved, and only zeolite Y remaining unaffected. Similar behavior is observed in the dissolution of geopolymer gels at different stages. The dissolution mechanism involves acid attack followed by chelation with salicylic acid to remove aluminum.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
M-E M. L. Lissens, Pedro S. F. Mendes, Beatriz Estevens, Auguste Fernandes, Filipa Ribeiro, Maarten K. Sabbe, Joris W. Thybaut
Summary: The effect of Si/Al ratio on operating regime, activity and selectivity in methanol-to-olefins conversion has been studied. Lower Si/Al ratio and higher temperature lead to an increase in production of C-3-C-5 olefins. This is mainly due to increased distance between acid sites or reduced physisorbed concentrations and activation energy differences.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Multidisciplinary Sciences
Mohammed A. Sanhoob, Galal A. Nasser, Akolade I. Bakare, Oki Muraza, Talal K. Al-Shammari, Hwei Voon Lee, Toshiyuki Yokoi, Sungsik Park, Toshiki Nishitoba
Summary: ZSM-5 zeolite synthesized with microwave radiation showed excellent selectivities and catalytic performances in methanol conversion to light olefins.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Chemistry, Inorganic & Nuclear
Yoshitaka Mizuno, Koji Miyake, Shunsuke Tanaka, Norikazu Nishiyama, Choji Fukuhara, Chang Yi Kong
Summary: OSDA/solvent-free synthesis of zeolites is suitable for commercialization due to low environmental impact and cost efficiency. This study successfully synthesized various types of zeolites by adjusting Si/Al ratios and crystallization temperature, showing that zeolites with high T atom density are more stable at higher crystallization temperatures. This work establishes a clear guideline for the OSDA/solvent-free synthesis of zeolites by revealing the correlation between Si/Al ratio and crystallization temperature.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Mina Sadrara, Mohammadreza Khanmohammadi Khorrami, Jafar Towfighi Darian, Amir Bagheri Garmarudi
Summary: A highly mesoporous ZSM-48 zeolite has been successfully synthesized using low-cost surfactant and costructure directing agent. Various characterization methods were used to investigate the properties of the synthesized zeolite. The catalytic conversion of methanol to gasoline revealed that the optimized zeolite exhibited enhanced catalytic activity.
SOLID STATE SCIENCES
(2022)
Review
Chemistry, Multidisciplinary
Ana Palcic, Enrico Catizzone
Summary: Zeolites are efficient catalysts for methanol conversion reactions, with the crystal size affecting activity, product distribution, and coke deposition. Recent studies focus on the application of nanosized zeolites in MTD, MTO, and MTG processes, with critical discussion on product distribution, coke formation, and deactivation. Methods for preparing nanosized zeolites are mentioned, highlighting the impact of crystal size on zeolite-catalyzed methanol conversion reactions.
CURRENT OPINION IN GREEN AND SUSTAINABLE CHEMISTRY
(2021)
Article
Chemistry, Physical
Kamila Pyra, Karolina A. Tarach, Kinga Gora-Marek
Summary: This study explored the production of high olefins yield from plastic waste without losing gasoline fraction, by comparing different properties of commercial FAU zeolites and mesoporous materials. A polypropylene (PP) cracking catalyst suitable for low-temperature operation was found. Advanced characterization techniques and analysis methods provided insights into the active species during cracking reaction and the nature of coke deposit formed after reaction.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Faisal H. Alshafei, Youngkyu Park, Stacey I. Zones, Mark E. Davis
Summary: ERI-type molecular sieves with varying Si/Al and Si/T-atom ratios showed improved performance in the methanol-to-olefins reaction. They exhibited higher ethylene-to-propylene ratios compared to other zeolites, while SAPO-17 samples had a higher C-4+ fraction. The differences in product distributions were attributed to the slower maturation of aromatic hydrocarbon-pool species and the presence of aromatics with bulky alkyl-groups in SAPO-17 samples.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Xiangkun Wu, Zihao Zhang, Zeyou Pan, Xiaoguo Zhou, Andras Bodi, Patrick Hemberger
Summary: In this study, the experimental detection of methylketene as the precursor of ethylene on HZSM-5 was reported, providing evidence for the computationally predicted ketene-to-ethylene reaction pathway.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Fan Yang, Xianzhi Jia, Rui Xu, Lu Liu, Chengyi Dai, Binran Zhao
Summary: This study investigated the kinetics of methanol transformation to aromatics using a 3Zn-3Si/ZSM-5 catalyst for the selective production of p-xylene. The products were divided into four categories in the kinetic model, including methanol and dimethyl ether, alkanes and alkenes, aromatics (except p-xylene), and p-xylene. The kinetic study was conducted at temperatures ranging from 623.15 to 748.15 K. The kinetic model and its parameters were calculated using the Runge-Kutta method and the genetic algorithm. The obtained reaction rate constants and kinetic reaction equations provide valuable theoretical support for subsequent reactor simulation and design.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Huidong Liu
Summary: The conversion of solid residue from coal fly ash alumina extraction (FAAE) into aluminum-rich zeolite and silicon-rich zeolite was investigated in this research. The process involved alkali roasting, water leaching, and hydrothermal synthesis. The results showed that nearly 100% conversion of FAAE residue into zeolite products was achieved, and the tail liquid containing Na2CO3 could be completely recycled.
Article
Materials Science, Multidisciplinary
Youhe Wang, Tingting Li, Chencan Li, Jinzhi Lu, Chang Dai, Fazle Subhan, Peng Bai, Hongman Sun, Rui Feng, Zifeng Yan
Summary: The development of a sustainable synthesis route for Fe-ZSM-5 zeolites is important for their diverse applications. A novel dry gel conversion method was reported for one-pot synthesis of Fe-ZSM-5 zeolites, which does not require adding templates or seed crystals, improving synthesis efficiency and reducing environmental pollution. Characterization results showed that Fe-ZSM-5-In has enhanced acid amount and better distribution of framework Fe3+ species compared to Fe/ZSM-5-Im.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Applied
Yiquan Xie, Ling Zhang, Yiwen Jiang, Shichao Han, Liang Wang, Xiangju Meng, Feng-Shou Xiao
Summary: The study investigated the catalytic combustion of methane over zeolite-supported Pd catalysts, finding significant improvement in catalytic performance through ion exchange, with NaLa-ZSM-5 supported Pd catalyst showing the best result. Using an optimized catalyst, methane conversion could be achieved at a lower temperature. Factors influencing catalytic activity were identified as Pd dispersion and its chemical states.
Article
Chemistry, Applied
Ye Ma, Shichao Han, Qinming Wu, Longfeng Zhu, Huimin Luan, Xiangju Meng, Feng-Shou Xiao
Summary: A new method for synthesizing metal-zeolite catalysts with high yield, reduced pollutants, and a simple process has been reported in this study, potentially important for practical applications in the future.
Article
Chemistry, Applied
Jian Zhang, Zerui Su, Zhiyi Wu, Pingzhou Wang, Feng-Shou Xiao
Summary: This study developed a basic hydroxyapatite supported Pt nanoparticles (Pt/HAP-3) catalyst for the catalytic hydrogenolysis of alkaline lignin, achieving a high monomer yield of 15.1%. The synergy between suitable metal nanoparticles and sufficient basic sites of the carrier was found to be the key factor for the high monomer yield. This work could provide insights for the preparation of efficient catalysts for lignin hydrogenolysis in the future.
Article
Chemistry, Multidisciplinary
Zaibin Guo, Wenming Hao, Jinghong Ma, Ruifeng Li
Summary: The hierarchical EU-1 zeolites prepared using organofunctionalized fumed silica show improved adsorption and diffusion of toluene and 1,3,5-trimethylbenzene, as well as higher conversion rates in the catalytic transformation of 1,3,5-trimethylbenzene compared to conventional microporous EU-1 zeolites. The increased mesoporosity leads to enhanced performance in both adsorption and catalytic processes.
JOURNAL OF CHEMICAL RESEARCH
(2021)
Article
Engineering, Chemical
Chaofeng Zhang, Tonglu Zhang, Jing Zhang, Jiandong Zhang, Ruifeng Li
Summary: The encapsulated IL@SBA-16-Cx solid catalysts show promising selectivity and activity in the synthesis of PODEn, making them potential important catalysts for future PODEn synthetic reactions.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Yongfeng Li, Jiaojiao Su, Feng Yu, Xiaoliang Yan, Dahai Pan, Ruifeng Li, Yongxing Yang
Summary: The Co-containing catalysts supported on super-microporous Al2O3-ZrO2 with different Al/Zr molar ratios showed that the catalytic performance was highly influenced by the textural and chemical properties. Among them, the 2.5Co/AZ(0.7) catalyst with intermediate acidity, high surface area, and high metal dispersion exhibited the best performance in the dehydrogenation of ethylbenzene with CO2.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Applied
Chunzheng Wang, Weisong Xu, Zhengxing Qin, Hailing Guo, Xinmei Liu, Svetlana Mintova
Summary: Enhanced interactions between palladium and EMT zeolite inhibit sintering of palladium clusters and maintain Pd2+ active sites, which is crucial for the excellent performance of the catalyst in the indirect oxidative carbonylation of methanol to DMC.
JOURNAL OF ENERGY CHEMISTRY
(2021)
Article
Chemistry, Physical
Yan Wang, Wei Liu, Wei Zhang, Jinghui Sun, Sai Li, Jiajun Zheng, Binbin Fan, Ruifeng Li
Summary: The study demonstrated that alkali treatment can enhance the catalytic activity and selectivity of isomers for n-dodecane hydroisomerization over Pt/ZSM-48 and Pt/ZSM-22 catalysts. The two catalysts have different effects on the generation of isomers, with Pt/ZSM-22 favoring the production of mono-branched isomers near the end of the chains, while Pt/ZSM-48 favoring the formation of di-branched isomers with methyl near the middle of the carbon chains.
Article
Chemistry, Physical
Quanhua Wang, Sai Li, Yanchao Liu, Lichen Zhang, Jiajun Zheng, Binbin Fan, Shuwei Chen, Wenlin Li, Ruifeng Li
Summary: A flowerlike hierarchical SAPO-5 molecular sieve was successfully fabricated using tetrapropyl-ammonium hydroxide as a structure-directing agent via a hydrothermally dynamic crystallization route. Analysis confirmed high crystallinity and large external surface areas. Increasing crystallization time led to more Si species being incorporated into the AFI crystals, highlighting the importance of dynamic crystallization conditions in the synthesis process.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Chemistry, Applied
Meng Pan, Jiajun Zheng, Yang Ou, Quanhua Wang, Lichen Zhang, Ruifeng Li
Summary: By adjusting the crystallization kinetics through changing the amount of NaOH added, hierarchical zeolites with enhanced diffusion property and superior catalytic cracking ability can be achieved. The hierarchical ZSM-5 zeolite modification process involves the formation of wormlike precursors, aggregation, condensation, and the formation of external shell layers.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Applied
Chengtao Wang, Wei Fang, Liang Wang, Feng-Shou Xiao
Summary: This study presents a strategy for optimizing gasoline selectivity by fixing metal nanoparticles within zeolite crystals, which overcomes the ASF limitation and offers a potential route for the direct transformation of syngas to liquid fuels with controllable selectivities.
JOURNAL OF ENERGY CHEMISTRY
(2021)
Article
Energy & Fuels
Ningyue Lu, Hongyan Wang, Yan Wang, Xiaoliang Yan, Binbin Fan, Ruifeng Li
Summary: In this study, a novel bifunctional catalyst Pt@SOD + HZSM-5 was designed, which exhibited outstanding selectivity to C6-cyclic products in the hydrogenative conversion of methylcyclopentane (MCP) through combining spillover hydro/dehydrogenation and acid-catalyzed mechanism. Additionally, the Pt@SOD + HZSM-5 coupling catalyst showed excellent sulfur-tolerant ability.
Article
Chemistry, Physical
Peng Shan, Panpan Niu, Huifang Zhang, Chuanhao Zhang, Ningyue Lu, Yan Wang, Binbin Fan, Ruifeng Li
Summary: The Ir/H-SSZ-13 catalysts showed higher activity and yields in methylcyclopentane ring-opening reaction compared to other catalysts. Ir species supported on H-SSZ-13-A exhibited higher activity than those on H-SSZ-13-B, especially at low Ir loading. The presence of strong acid sites on the external surface of H-SSZ-13-A promoted the reactivity of Ir/H-SSZ-13-A, making it a potential catalyst for ring-opening reactions.
CATALYSIS COMMUNICATIONS
(2021)
Article
Crystallography
Changsheng Zhang, Kai Fan, Ge Ma, Chi Lei, Wei Xu, Jie Jiang, Bing Sun, Hongxing Zhang, Yunfeng Zhu, Song Wen
Summary: Hierarchically structured nanosized mesoporous ZSM-5 (SN-ZSM-5) zeolites were successfully synthesized without the use of mesoscale templates under highly concentrated conditions, showing improved catalytic performance in methanol-to-olefins (MTO) reactions with longer catalyst lifetime and higher propylene selectivity compared to conventional ZSM-5 zeolites. The etching effect of the highly alkaline environment was identified as a key factor in the formation of the hierarchical structure in SN-ZSM-5.
Article
Chemistry, Applied
Huimin Luan, Chi Lei, Ye Ma, Qinming Wu, Longfeng Zhu, Hao Xu, Shichao Han, Qiuyan Zhu, Xiaolong Liu, Xiangju Meng, Feng-Shou Xiao
Summary: A novel synthesis method was developed to successfully produce high-silica ZSM-5 zeolites without organic structure-directing agents, showing potential for future industrial production and catalytic applications.
CHINESE JOURNAL OF CATALYSIS
(2021)