Article
Engineering, Chemical
Yu-Ling Zhang, Xue-Gang Li, Wen-De Xiao
Summary: This study investigates the transformation mechanism of C3-C6 olefins on SAPO-34 catalyst without methanol co-feeding. A reaction network is constructed and validated, providing accurate predictions of product distribution.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Chemistry, Applied
Baorong Wang, Peixin Rui, Xinheng Cai, Xianqing Xie, Weilin Liao, Yibin Luo, Xingtian Shu
Summary: This study investigates the co-feeding of methanol from stripper units to enhance the ethylene selectivity in the conventional FCC process. The results show that the use of SAPO-34 catalyst under specific conditions can significantly improve the yield of ethylene and light olefins.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Engineering, Chemical
Huaiqing An, Hua Li, Jibin Zhou, Jinling Zhang, Tao Zhang, Mao Ye, Zhongmin Liu
Summary: This study investigated the kinetics of steam regeneration of spent SAPO-34 catalyst, showing that increasing regeneration temperature can improve catalyst performance and prolong its lifetime. Within an appropriate temperature range, steam regeneration can alter the composition of residual coke on the catalyst, promoting the production of light olefins.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Materials Science, Ceramics
Hanie Karimi, Jafar Towfighi, Sahar Akhgar
Summary: Hierarchical porous zeolites with mesoporosity introduced by PEG showed improved catalytic performance in the MTO reaction, with a direct relation between mesopores and PEG molecular weight affecting diffusion pathways and acidity. The tuned SAPO-34 catalysts demonstrated enhanced stability and selectivity to light olefins, particularly propylene and total butylene, in comparison to their parent and other modified counterparts.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2021)
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
Biochemical Research Methods
Sogand Aghamohammadi, Mohammad Haghighi, Parisa Sadeghpour, Tayebeh Souri
Summary: The study explored the production of light olefins from methanol over SAPO-34 molecular sieves using mono and dual templates. Different templates affected the crystallinity, phase peaks intensity, Si incorporation, and morphology of the final product. The catalyst synthesized with a TEA/morpholine mixture showed the best performance in terms of lifetime and selectivity for light olefins production.
COMBINATORIAL CHEMISTRY & HIGH THROUGHPUT SCREENING
(2021)
Article
Energy & Fuels
Muhammad Sheraz Ahmad, Chin Kui Cheng, Prakash Bhuyar, A. E. Atabani, Arivalagan Pugazhendhi, Nguyen Thuy Lan Chi, Thongthai Witoon, Jun Wei Lim, Joon Ching Juan
Summary: The rising demand for light olefins production due to population growth, expanding transportation network, and rapid industrialization has made methanol-to-olefins conversion the most preferred route, although high selectivity remains a challenge. Molecular sieves have been an active commercial development area for the past two decades, as they efficiently decrease coke deposition, improve mass transport, and enhance catalytic performance in methanol to olefins reaction. SAPO-34 molecular sieves are highly selective for ethylene and propylene synthesis, exhibiting the best performance for the MTO process.
Article
Chemistry, Multidisciplinary
Bing Hu, Wenxin Chen, Xiaojin Wang, Guoliang Mao, Mingjian Luo
Summary: The etching behavior of TEAOH in the post-synthesis of hierarchical SAPO-34 was investigated, and the results showed that the solubility of SAPO-34 decreases while the dissolution rate increases with the raise of temperature. The etching is believed to start with the break of Al-O(H)-Si bond and then break the Al-OH-related Al-O-P bonds and the new exposed inner Al-O(H)-Si bonds. Low-temperature etching favors the dissolution of Al-OH-related Al-O-P bonds and behaves as a layer-to-layer peel-off process, while moderate- and high-temperature etching leads to the formation of abundant mesopores and fragmentation of crystals.
RESEARCH ON CHEMICAL INTERMEDIATES
(2023)
Article
Green & Sustainable Science & Technology
Z. Liu, Q. Wang, S. Liu, M. Yang, D. Fan, D. Zhu, P. Tian
Summary: The large-scale industrialization of the methanol-to-olefins (MTO) process has led to a significant consumption of MTO catalyst. The conversion of spent MTO catalyst into valuable materials is important for environmental protection and the development of the MTO industry. In this study, the spent MTO catalyst was used as raw material for the synthesis of SAPO-34 and their catalytic applications. Different-sized amines were employed as synthesis templates, and high crystallinity SAPO-34 with varied Si contents could be synthesized using the reactive Si/Al/P sources in the spent MTO catalyst. Low-silica SAPO-34 exhibited good catalytic performance, and SAPO-34-DEA showed excellent catalytic performance in the methanol ammoniation reaction due to its higher acid concentration and larger crystal size.
MATERIALS TODAY SUSTAINABILITY
(2023)
Article
Chemistry, Inorganic & Nuclear
Wenyan Ma, Yida Zhou, Jiani Zhang, Siyu Zong, Bolun Wang, Jiyang Li
Summary: This study proposes a method to transform waste zeolite catalyst into carbon dots-zeolite composites with controllable luminescence. By adjusting the calcination conditions, the fluorescence behavior of the composites can be tuned. This work provides a novel synthetic route for recycling waste materials.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Chemistry, Multidisciplinary
Jihui Yao, Jiapeng Jiao, Ruiqiang Liu, Fei Zha, Xiaojun Guo, Xiaohua Tang, Haifeng Tian, Yue Chang
Summary: The study successfully synthesized metal-modified SAPO-34 molecular sieves using the template-assisted method, which exhibited better dispersion and catalytic performance compared to those prepared by impregnation. Ni-modified SAPO-34 molecular sieves showed high methanol conversion and selectivity to light olefins in the methanol-to-olefins reaction.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Biochemical Research Methods
Hossein Roohollahi, Rouein Halladj, Sima Askari
Summary: SAPO-34/AlMCM-41 hierarchical nanocomposite molecular sieve was prepared and studied for catalytic conversion of methanol to light olefins. The composite showed higher methanol conversion and comparable initial selectivity to light olefins, but deactivated faster than pure SAPO-34, possibly due to its smaller mean pore diameter.
COMBINATORIAL CHEMISTRY & HIGH THROUGHPUT SCREENING
(2021)
Article
Chemistry, Physical
Haiyan Liu, Ehsan Kianfar
Summary: Nine samples of SAPO-34 nanocatalysts were synthesized at different temperatures and times, characterized by various techniques and evaluated for their catalytic performance in converting methanol to light olefins. The results showed that crystallinity, crystal size, and surface acidity significantly influenced the olefin selectivity and lifetime of the catalysts.
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
Lei Tao, Xueliang Zhang, Lizhu Song, Huilin Hu, Lequan Liu, Jinhua Ye, Defa Wang
Summary: The study focused on the methanol-to-olefins (MTO) reaction using TiN nanparticles for photothermal effect in TiN(x)/SAPO-34 catalysts, achieving high methanol conversion and ethene selectivity through synergistic effects of high photothermal temperature, sufficient Bronsted acid sites, and moderate BET surface area.
Review
Chemistry, Applied
Enlai Wang, Fuhui Yang, Mingyu Song, Guoliang Chen, Qinqin Zhang, Fang Wang, Liancheng Bing, Guangjian Wang, Dezhi Han
Summary: This review provides an overview of the research progress in unsupported catalysts for the hydrodesulfurization (HDS) of fuel, including template-free methods, template methods, and future development prospects.
FUEL PROCESSING TECHNOLOGY
(2022)
Review
Chemistry, Physical
Xiaoqi Lin, Kaisen Jiang, Xuebin Liu, Dezhi Han, Qinqin Zhang
Summary: Lignocellulosic biomass is a renewable and abundant resource that can be converted into bio-based chemicals and fuels with high added value. Ionic liquids have many advantages in biomass pretreatment and conversion, and the design and improvement of catalysts and pretreatment solvents are crucial for achieving low-cost, efficient, and green biomass conversion.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Review
Chemistry, Multidisciplinary
Fushan Feng, Haiyuan Zhang, Shaoqi Chu, Qinqin Zhang, Chao Wang, Guangjian Wang, Fang Wang, Liancheng Bing, Dezhi Han
Summary: Propene is a crucial chemical raw material and its demand is continuously increasing in the propene downstream industry. Propane dehydrogenation (PDH) process is an attractive alternative to efficiently produce high-purity propene compared to traditional catalytic cracking and steam cracking of naphtha. This review summarizes the recent progress on traditional catalysts, emerging non-noble metal catalysts, and carbon catalysts for PDH, discussing key research issues and development directions. It provides a theoretical and technical foundation for developing novel high-efficiency PDH catalysts.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Editorial Material
Chemistry, Physical
Dezhi Han, Wentai Wang, Ning Han
Review
Chemistry, Physical
Shaoqi Chu, Enlai Wang, Fushan Feng, Changsheng Zhang, Jie Jiang, Qinqin Zhang, Fang Wang, Liancheng Bing, Guangjian Wang, Dezhi Han
Summary: Volatile organic compounds (VOCs) are important precursors for secondary pollutants, causing severe environmental problems. Catalytic oxidation is a safe and eco-friendly method to convert VOCs into CO2 and H2O. Noble metal catalysts, with high reaction activity, stability, poisoning resistance, and easy regeneration, have been widely studied for VOCs removal.
Article
Energy & Fuels
Haiwei Li, Shangqing Zhao, Weilong Zhang, Hui Du, Xiaolong Yang, Yanhua Peng, Dezhi Han, Bo Wang, Zhuo Li
Summary: Zeolite-based solid acid catalysts are a promising alternative to liquid acid catalysts for producing eco-friendly plasticizer tributyl citrate (TBC), due to their non-corrosive nature, high hydrothermal stability, and recyclability.
Article
Energy & Fuels
Enlai Wang, Qinghong Li, Mingyu Song, Fuhui Yang, Yonghang Chen, Guangjian Wang, Liancheng Bing, Qinqin Zhang, Fang Wang, Dezhi Han
Summary: The melamine foam was used as a support to fabricate the CoxMo/MF supported HDS catalysts with three-dimensional porous structure. The obtained catalysts showed the 3DP structure with metal oxides attached to the MF framework. The Co2.0Mo/MF catalyst exhibited high thiophene conversion due to its unique 3DP structure with rich meso-/macropores and low average stacking of crystalline MoS2.
Article
Chemistry, Inorganic & Nuclear
Yahang Mou, Changyou Xu, Zan Sun, Shuhua Liu, Fang Wang, Dezhi Han, Guangjian Wang, Liancheng Bing
Summary: Nano-sized SSZ-13 with hierarchical structure was synthesized by combining ultrasonic pretreatment and seed induced crystallization. The synthesized catalysts were characterized by various techniques, and it was found that ultrasonic pretreatment reduced the crystallization time and decreased the zeolite crystals to nano size. The hierarchical nano-sized SN-17 catalyst showed improved catalytic lifetime and selectivity for ethylene and propylene due to enhanced mass transport efficiency and decreased coking rate, compared to the conventional SM-24 catalyst.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Hongxia Zhang, Yahang Mou, Shuhua Liu, Dezhi Han, Fang Wang, Liancheng Bing, Guangjian Wang
Summary: In this study, a uniformly dispersed NiPCeOx/MCM-41 catalyst was prepared and shown to exhibit exceptional catalytic performance and durability in ammonia borane hydrolysis.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Jinghu Zhu, Hui Liu, Xueyan Zhou, Zhijun Wang, Liancheng Bing, Dezhi Han, Guangjian Wang, Fang Wang
Summary: This article studied the performance of Cu-based catalysts modified by gallium addition for the liquid phase hydrogenation of hydroxypivalaldehyde (HPA) to neopentyl glycol (NPG) using the stepwise co-precipitation method. The effects of gallium introduction on the Cu trimetallic catalyst performance and the reaction mechanism of HPA hydrogenation were discussed. The results showed that gallium introduction influenced the dispersion, reduction, and distribution of active Cu species, as well as their reactivity. The catalyst with 2 wt% gallium addition exhibited excellent catalytic performance with HPA conversion rate and NPG selectivity of 93.5% and 95.5%.
Article
Agricultural Engineering
Xiaoqi Lin, Kaisen Jiang, Xuebin Liu, Hongyan Bi, Tianya Li, Dezhi Han, Qinqin Zhang
Summary: A one-pot strategy for the conversion of corn stalk to ethyl levulinate and the extraction of valuable lignin catalyzed by ionic liquids (ILs) was proposed in this work. The optimized catalyst of [C3H6SO3Hmim]HSO4 achieved a favorable ethyl levulinate yield of 24.72% from corn stalk at 200 degrees C for 90 min. The lignin extraction was greatly influenced by the cosolution system, with a high lignin yield of 79.94% achieved in a 75% (v/v) ethanol-water system. This study demonstrated the morphological, thermal, and functional group changes during lignin liquefaction, and the 2D-HSQC analysis confirmed the presence of a stable lignin structure that facilitated its valorization. Overall, this work proposes a feasible biorefinery strategy for the effective conversion and utilization of lignocellulosic biomass.
BIOMASS & BIOENERGY
(2023)
Article
Chemistry, Physical
Wenwen Cong, Hongxia Zhang, Liancheng Bing, Fang Wang, Dezhi Han, Guangjian Wang
Summary: Hierarchical Co3O4/SAPO-34 supported PtCo bimetallic nanoparticles with uniform dispersion and narrow size-distribution were prepared. The catalyst exhibited outstanding catalytic activity in the hydrolysis reaction with a high TOF value. The hierarchical structure of SAPO-34 played a crucial role in improving the dispersion of metal NPs and the mass transfer rate.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Analytical
Peng He, Haitao Fu, Yanlong Gong, Jie Chen, Xiaohong Yang, Dezhi Han, Shixian Xiong, Song Li, Xizhong An
Summary: In order to detect flammable gases and reduce energy consumption, room-temperature gas sensors with high sensitivity, selectivity, and stability have become increasingly popular. In this study, SnO2@ZnS core-shell hollow spheres were prepared using a two-step hydrothermal method. The effects of morphology and composition on gas sensing performance were investigated by adjusting the molar ratio of SnO2 to ZnS. The core-shell composites showed excellent sensing properties to n-butanol, with a sensing response four times higher than that of the pristine SnO2 hollow spheres.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Energy & Fuels
Xingyuan Cheng, Jie Gu, Bingtian Huang, Liancheng Bing, Dezhi Han, Guangjian Wang, Fang Wang
Summary: In this study, various metal-modified ZSM-5 zeolite adsorbents were prepared by the impregnation method and applied to the removal of organic chlorides from model naphtha. The adsorption performance and regeneration stability were investigated, and the Mg/ZSM-5 zeolite adsorbent showed the best dechlorination and regeneration performance. The introduction of the metal significantly influenced the acidic properties of the catalyst surface.
CHINA PETROLEUM PROCESSING & PETROCHEMICAL TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Shuaiguo Zhang, Qiang Li, Yahang Mou, Liancheng Bing, Fang Wang, Dezhi Han, Guangjian Wang
Summary: The spatial distribution of zinc species in Zn-modified SSZ-13 catalysts significantly enhances the selectivity towards light olefins in the methanol-to-olefin reaction. The Zn(1.31)-SSZ-13-IE catalyst shows the best catalytic performance with high selectivity ratios of ethylene-to-propylene.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Engineering, Chemical
Ri Zhang, Shasha Zhang, Mengyan Ding
Summary: A thin liquid film method is proposed to evaluate sand erosion in annular flow. This method considers the direct interaction between the liquid film and gas core, as well as the entrainment and deposition of droplets. The erosion rate is calculated by considering the effects of liquid entrainment and particle velocity decay. The method is fully verified by comparing with experimental data.
Article
Engineering, Chemical
Yu Suo, Xianheng Su, Wenyuan He, Xiaofei Fu, Zhejun Pan
Summary: This research investigates the mechanical properties of sandstone-shale composite through orthogonal experimental method and discrete element simulation. The results show that different lithologies and thickness ratios can affect the strength and fracture mode of the composite rock samples.
Article
Engineering, Chemical
Maurizio Troiano, Andrea El Hassanin, Roberto Solimene, Alessia Teresa Silvestri, Fabrizio Scala, Antonino Squillace, Piero Salatino
Summary: This study investigates the potential of Fluidized Bed Finishing (FBF) for square flat AlSi10Mg specimens manufactured via Laser-Powder Bed Fusion (L-PBF) additive manufacturing technology. The results show that good finishing can be achieved using rotation-assisted tests, with a maximum reduction of surface roughness by 67%. Steel particles are found to be the most effective bed material.
Review
Engineering, Chemical
Ningbo Song, Wanzhong Yin, Jin Yao
Summary: Seawater's dissolved salts and minerals have various effects on the flotation process, including influencing the characteristics and behavior of flotation factors, as well as affecting the surface of sulfide minerals. In most cases, seawater has adverse effects on the flotation of sulfide minerals, but these effects can be mitigated by adjusting the reagents.
Article
Engineering, Chemical
Kaiqiao Wu, Shuxian Jiang, Victor Francia, Marc-Olivier Coppens
Summary: In rectangular and cylindrical annular fluidized beds, pulsating gas flow can create regular bubble patterns, overcoming challenges seen in conventional units. This study provides new opportunities for modularization of fluidized bed operations.
Article
Engineering, Chemical
Shuo Li, Huili Zhang, Jan Baeyens, Miao Yang, Zehao Li, Yimin Deng
Summary: The paper assesses the behavior of cohesive Geldart C-type particles when fluidized by air with the aid of vibration. It determines that mechanical vibration is a simple and effective method to improve the fluidity of cohesive particles during fluidization.
Article
Engineering, Chemical
Zhenfei Feng, Qingyuan Zhang, Shanpan Liang, Zhenzhou Li, Fangwen Guo, Jinxin Zhang, Ding Yuan
Summary: A new micro/mini-channel heat sink (MCHS) with a combined structure of longitudinal and transverse vortex generators is designed, using Al2O3 nanofluid as the working medium. The study explores the effects of transverse vortex generator shape and longitudinal vortex generator angle on the hydraulic and thermal characteristics, comprehensive performance, entropy generation, and exergy efficiency. The results show that the triangular transverse vortex generator improves the comprehensive performance and exergy efficiency. Combined with the longitudinal vortex generator, the MCHS achieves the best comprehensive performance, entropy generation, and exergy efficiency when the Reynolds number is 742.
Article
Engineering, Chemical
Kostas Giannis, Christoph Thon, Guoqing Yang, Arno Kwade, Carsten Schilde
Summary: This study presents a 3D convolutional neural network (3D-CNN) methodology for generating realistic 3D models of particles. The method trains on 2D projections of particle images to predict their 3D shapes, and evaluates the accuracy of the predictions using Fourier shape descriptors (FSDs). This methodology has wide applications in particle shape analysis.
Article
Engineering, Chemical
Zheng-qing Zhou, Lu-jia Chai, Yu-long Zhang, Ya-bin Wang, Ze-chen Du, Tian-yi Wang, Yu-zhe Liu
Summary: The dynamic oxidation and shell-breaking processes of aluminum nanoparticles (ANPs) during heating were studied using in situ transmission electron microscopy. The results revealed that the changes in shell thickness can be divided into three stages, and the active aluminum content of ANP decreased before shell-breaking.
Article
Engineering, Chemical
Fulei Chen, Huaqing Ma, Zihan Liu, Lianyong Zhou, Yongzhi Zhao
Summary: A particle breakage model based on the particle replacement scheme, using the polyhedral model to describe particles, is proposed in this work to accurately describe the breakage of a large number of particles. Additionally, a fast-cutting algorithm is proposed to reproduce the size distribution of progeny particles determined by the breakage model. The validation and simulation results show satisfactory accuracy, efficiency, and stability of the algorithm.
Review
Engineering, Chemical
Matteo Errigo, Christopher Windows-Yule, Massimiliano Materazzi, Dominik Werner, Paola Lettieri
Summary: Gas-solid fluidized-bed systems have advantages in terms of chemical reaction efficiency and temperature control, making them widely used in industrial applications. However, the design, scale-up, and optimization of these complex units are limited by the lack of deep physical understanding. Non-invasive and non-intrusive diagnostic techniques provide a way for researchers to study these systems without affecting the flow field or directly contacting the medium under study.
Article
Engineering, Chemical
Saeed Fateh, Mohammad Behshad Shafii, Mohammad Najafi, Cyrus Aghanajafi
Summary: Applying a magnetic field to ferrofluids alters their flow characteristics and enhances heat transfer. Through visualization and quantitative investigation, it is found that the magnetic field influences the flow patterns and velocity profiles, improving fluid mixing and vorticity magnitude.
Article
Engineering, Chemical
Lei Gao, Bingbing Wei, Xiaochuan Hu, Zaifeng Yao, Yiwen Fang, Xuejian Gao
Summary: In this study, a numerical model of sand triaxial test was established using discrete element software PFC3D, and an indoor triaxial test was conducted to calibrate the numerical model. The influence of microscopic parameters on the macroscopic mechanical response of sand was analyzed. The results showed that the friction coefficient had the greatest impact on the peak strength and residual strength of the sand's stress-strain curve, and it was positively correlated. The normal tangential stiffness ratio was negatively correlated, while the porosity and boundary flexibility stiffness had minimal influence on it.
Article
Engineering, Chemical
Xuan Liu, Jie Gong, Kai Jiang, Xiaojuan Lai, Yu Tian, Kang Zhang
Summary: This study aimed to improve the performance of lignite coal water slurries (CWSs) by synthesizing a series of three-arm amphiphilic block copolymers. By controlling the relative molecular weight, hydrophilic/hydrophobic ratio, and ionic group content, the apparent viscosity of CWSs was significantly reduced and the static stability was improved. Thermogravimetric testing and XPS analysis were conducted to reveal the mechanism behind the improved performance.
Article
Engineering, Chemical
Lanka Dinushke Weerasiri, Daniel Fabijanic, Subrat Das
Summary: Fluidization at low pressure offers significant benefits for the fine chemical industry. This study investigates the behavior of bubbles and bed expansion under low pressure conditions. It is found that lower pressure leads to larger bubbles, increased bubble quantity, and higher aspect ratio. The predictability is affected by the inhomogeneous fluidization, but low pressure fluidization can generate similar bubble sizes with lower fluidizing mass compared to atmospheric pressure.