Article
Multidisciplinary Sciences
Liu Yang, Chang Wang, Lina Zhang, Weili Dai, Yueying Chu, Jun Xu, Guangjun Wu, Mingbin Gao, Wenjuan Liu, Zhaochao Xu, Pengfei Wang, Naijia Guan, Michael Dyballa, Mao Ye, Feng Deng, Weibin Fan, Landong Li
Summary: Studying the dynamic changes of SAPO-34 framework during MTO conversion, researchers found that pre-coking and water co-feeding can efficiently suppress T-O-T bond breakage during long-term continuous regenerations, thus promoting catalytic efficiency and long-term stability in commercial MTO processes.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Ya-Qin Tang, Meng-Xia Yan, Chang-Qian Lu, Shao-Yuan Li, Kui-Xian Wei, Tao Qu, Wen-Hui Ma, Yong-Nian Dai, Kong-Zhai Li, Da-Jun Luo, Xue-Liang Zhang, Yi-Ke Liu
Summary: This study reports a novel W18O49/Au/SAPO-34 multifunctional photothermal catalyst for the methanol-to-olefins (MTO) reaction, which exhibits excellent methanol conversion and ethylene yield. The physiochemical characterization reveals the properties of the catalyst and the role of W18O49 in regulating ethylene selectivity. This research provides new insights for designing heterostructures to improve photo-to-chemical conversion performance.
Article
Chemistry, Physical
Junyi Yu, Hua Li, Mao Ye, Zhongmin Liu
Summary: In this study, a modified group contribution (mGC) method is proposed to consider the interaction between guest molecules and host active sites in molecular sieves. The mGC method is used to estimate the thermodynamic properties of guest molecules and elementary reactions in the initial stage of the methanol to olefins (MTO) reaction over SAPO-34 molecular sieves. The results show that the mGC method is more accurate than conventional GC methods and provides an effective way for batch calculation of thermodynamic properties in molecular sieve catalyzed processes.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Engineering, Chemical
Bijan Hejazi, Neda Shabany
Summary: A two-phase model based on SAPO-34 catalyst particles was developed for simulating a bubbling fluidized bed reactor and catalyst regenerator. The model showed good agreement with experimental data and was successfully used for design and optimization of the MTO process. The development of this model provides convenience for the analysis of the MTO process.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Chemistry, Physical
Lihan Pan, Shiqun Wu, Zhan Huang, Shengwei Zhang, Lingzhi Wang, Jinlong Zhang
Summary: In this study, a modified Mo-oxide zeolite was used to achieve photo-driven nonoxidative coupling of CH4. It was found that light irradiation is essential for the activation of C-H bonds. Adjusting the Mo loading and acidity strength of the catalysts is significant for their catalytic activity and stability.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Runze Jin, Haobin Hu, Jiaofei Wang, Zhuangzhuang Zhang, Chengyi Dai, Xiaoxun Ma
Summary: Dividing the traditional methanol to aromatics reaction into two steps using SAPO-34 and Zn/ZSM-5 as catalysts can significantly improve the aromatic selectivity through optimized loading methods and ratios.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Physical
Jasper van Kampen, Jurriaan Boon, Martin van Sint Annaland
Summary: Separation enhanced reaction processes are promising for carbon dioxide utilisation. In situ water removal results in high conversions and avoids the drawbacks of conventional methods. Membrane and adsorption technologies have shown great advancements in the direct production of methanol and dimethyl ether.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Energy & Fuels
Saeed Sahebdelfar, Parisa Moghimpour Bijani, Fereydoon Yaripour
Summary: The kinetics of deactivation of gamma-alumina catalyst in the dehydration of methanol to dimethyl ether were investigated, revealing a second-order independent deactivation kinetics that accurately fit the experimental data. The activation energies for the main reaction and catalyst deactivation were obtained, with the latter showing a negative value due to reversible partial hydration. At higher temperatures, irreversible sintering of alumina crystallites became the predominant deactivation mechanism.
Article
Multidisciplinary Sciences
Boyuan Shen, Xiao Chen, Xiaoyu Fan, Hao Xiong, Huiqiu Wang, Weizhong Qian, Yao Wang, Fei Wei
Summary: The micro-structures of zeolite catalysts have significant impact on their macroarchitectures and catalytic performances. By atomically resolving SAPO-34 and SAPO-18 zeolites, the correlation between structure and properties is revealed for enhancing their performances in methanol conversion. The real-space imaging of atomic lattices in different SAPO-34/18 intergrowth catalysts provides insights into improving catalytic activities based on unique architectures.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Shuchi Zhang, Dengyun Miao, Yi Ding, Mengyuan Li, Shujing Guo, Yujuan Zhang, Xiulian Pan, Xinhe Bao
Summary: The introduction of SAPO-34 into MnCrOx-ZSM-5 catalyst significantly enhances the formation of BTX without sacrificing the aromatics selectivity. SAPO-34 consumes partially the intermediates, inhibiting the methylation of BTX and leading to an enhanced BTX selectivity in the products. This hybrid catalyst provides an efficient method for highly selective synthesis of BTX from syngas.
SCIENCE CHINA-CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Shinya Kokuryo, Kazuya Tamura, Koji Miyake, Yoshiaki Uchida, Atsushi Mizusawa, Tadashi Kubo, Norikazu Nishiyama
Summary: Zr-doped SAPO-34 was synthesized to enhance the catalytic activity, highlighting the significance of Lewis acidity. The highly-dispersed Zr species in Zr-doped SAPO-34 contributed to the higher catalytic activity compared to pristine or Zr-loaded SAPO-34, indicating the strong impact of highly-dispersed Zr species on the performance of SAPO-34.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Weili Dai, Landong Li, Chang Wang, Liu Yang, Mingbin Gao, Xue Shao, Guangjun Wu, Naijia Guan, Zhaochao Xu, Mao Ye
Summary: This study presents a strategy of combining precoking and steaming to construct active naphthalenic species within SAPO-34 catalyst, achieving both high olefin selectivity and prolonged catalyst lifetime in methanol-to-olefin conversion. The spatiotemporal distribution and evolution of the naphthalenic species during the precoking and steaming processes were elucidated. This strategy shows promising prospects for commercial SAPO-34 catalyst in the methanol-to-olefin industry.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Zhengli Zhang, Yuxuan Huang, Hongfang Ma, Weixin Qian, Haitao Zhang, Weiyong Ying
Summary: The study demonstrates that MOF-derived ZnZrOx nanoparticles, when used as a component of bifunctional catalysts, exhibit enhanced CO conversion and olefins selectivity when combined with SAPO-34.
CATALYSIS COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Felix M. Kirchberger, Yue Liu, Philipp N. Plessow, Markus Tonigold, Felix Studt, Maricruz Sanchez-Sanchez, Johannes A. Lercher
Summary: The presence of water critically influences the kinetics of methanol autocatalytic conversion to hydrocarbons in acid zeolites. The main reactions at the initiation stage involve hydrogen transfer from methanol and DME to surface methoxy groups, leading to methane and formaldehyde in a 1:1 stoichiometry. The kinetic analysis of CH4 formation rates can be used as a unique quantitative parameter to characterize catalyst activity in the methanol-to-hydrocarbon process.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Materials Science, Multidisciplinary
Sara Navarro-Jaen, Mirella Virginie, Joelle Thuriot-Roukos, Robert Wojcieszak, Andrei Y. Khodakov
Summary: This study found that copper dispersion was higher and CO2 conversion rate was greater on alumina and zirconia supported catalysts, followed by ceria supported catalysts. The CO2 hydrogenation process appears to be mainly influenced by the higher copper dispersion and to a lesser extent by the concentration of Bronsted acid sites in the catalysts studied. Due to lower reverse water gas-shift activity, the alumina supported catalyst showed a higher dimethyl ether yield compared to the zirconia and ceria supported catalysts.
JOURNAL OF MATERIALS SCIENCE
(2022)
