Article
Chemistry, Applied
Yi Sun Choi, Jeong-Rang Kim, Jong-Ha Hwang, Hyun-Seog Roh, Hyoung Lim Koh
Summary: In this study, Pt-Sn/Al2O3 catalysts were prepared and reduced at different temperatures, and the effect of reduction temperature on the propane dehydrogenation (PDH) process was investigated. The catalytic activity increased with increasing reduction temperature, but decreased beyond 300°C. The study suggested that a moderate interaction between Pt and Sn was more suitable for PDH, and the decrease in catalytic activity at higher reduction temperatures was attributed to the formation and sintering of PtSn alloys as well as the blocking of Pt-Sn particles by Sn species. The optimized reduction temperature of 300°C could lead to the optimal design of the reduction process for PDH.
Article
Chemistry, Physical
Li Deng, Shaobo Han, Yong Li, Wenjie Shen
Summary: Atomic layer deposition was used to disperse Pt on modified Al2O3. The dispersion of Pt was found to depend on the atmosphere. The catalyst with amorphous Pt-Sn monolayer exhibited outstanding performance in propane dehydrogenation.
Article
Chemistry, Physical
Tso-Hsuan Chen, Dionisios G. Vlachos, Stavros Caratzoulas
Summary: In this study, AIMD free energy simulations were performed to investigate the dynamics of Pt atoms and Pt-n (n = 2-3) species on different surfaces and their interactions with the surface. The results reveal the significant impact of hydration on the energy and structure of the system, as well as the crucial role of Pt-Sn interactions. This study provides important insights into the properties and catalytic mechanisms of Pt catalysts under different environments.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Tso-Hsuan Chen, Dionisios G. Vlachos, Stavros Caratzoulas
Summary: In this study, AIMD free energy simulations were used to investigate the dynamics of Pt atoms and Pt n (n = 2-3) species on different surfaces. The results showed that the hydration of the surface and the loading of Pt and Sn have significant effects on the interactions between Pt atoms and the surface.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Yi Wang, Pengyang Luo, Zhikang Xu, Renwei Xu, Haibo Zhu
Summary: This study demonstrates that doping Nb and Ta into Pt-Sn/Al2O3 greatly impacts its structure, leading to highly dispersed Pt-Sn clusters on the surface of Al2O3 and improved thermal stability. The optimized Pt-Sn-Nb-5.0/Al2O3 and Pt-Sn-Ta-1.0/Al2O3 catalysts exhibit high propane conversion and propylene selectivity above 98%. Importantly, these catalysts show excellent regeneration in propane dehydrogenation, with their catalytic performance completely restored by simple calcination.
Article
Biochemistry & Molecular Biology
Camilla Brencio, Luca Di Felice, Fausto Gallucci
Summary: This study demonstrates the potential of the fluidized bed membrane reactor technology for the direct dehydrogenation of propane. Compared with the conventional fluidized bed reactor, the fluidized bed membrane reactor shows improved propane conversion and increased propylene yields.
Article
Chemistry, Physical
Jieli Wang, Xin Chang, Sai Chen, Guodong Sun, Xiaohong Zhou, Evgeny Vovk, Yong Yang, Wanyu Deng, Zhi-Jian Zhao, Rentao Mu, Chunlei Pei, Jinlong Gong
Summary: This study demonstrates that the recoverable Pt3Sn alloy surface structure through Sn segregation enables efficient propane dehydrogenation catalysis with high selectivity and stability, even after undergoing multiple cycles of acid etching-reduction procedures. The migration of Sn atoms from the core to the surface plays a crucial role in the recovery process, as confirmed by various characterization techniques and theoretical calculations.
Article
Chemistry, Applied
Caixia Miao, Meng Liu, Shengdong Tan, Guikai Zhang, Shengqi Chu, Shaojia Song, Qiyang Zhang, Jiaju Yu, Guiyuan Jiang, Weiyu Song, Qian He, Wenhao Luo, Zhijie Wu
Summary: Zeolite-tailored bimetallic Pt-Sn catalysts, Pt/Sn-Beta (DG) and Pt/Sn-Beta (DA), were prepared and compared. Pt/Sn-Beta (DG) showed superior performance in activity, selectivity, and stability due to the proper Pt-Sn nano-alloying, while Pt/Sn-Beta (DA) suffered from migration of excess extra-framework Sn species, resulting in less performance.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Engineering, Chemical
Chen Song, Jiarui Wang, Simin Wang, Jian Wen
Summary: The catalytic propane dehydrogenation reaction was studied in a bench-scale fluidized bed using experimental and computational methods. The effects of catalyst packing temperature, propane weight hourly space velocity, and catalyst composition on propane conversion were investigated. Results showed that temperature and velocity significantly influenced conversion rates, and the CrOx-based catalyst exhibited higher conversions compared to the Pt-based catalyst.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Chemistry, Physical
Roghayeh Bardool, David P. Dean, Hien N. Pham, Abhaya K. Datye, Sona Raeissi, Mohammad Reza Rahimpour, Jeffery T. Miller
Summary: In this study, Ga/gamma-Al2O3 catalysts were evaluated for propane dehydrogenation (PDH). The results showed that the selectivity of propylene decreased with increasing propane conversion. It was found that propylene is a primary product, while light gas by-products are secondary products. The study also confirmed that the same light gas products can be produced by a direct reaction of propylene.
JOURNAL OF CATALYSIS
(2023)
Article
Multidisciplinary Sciences
Huan Yan, Kun He, Izabela A. Samek, Dian Jing, Macy G. Nanda, Peter C. Stair, Justin M. Notestein
Summary: The study demonstrated that growing In2O3 over Pt/Al2O3 using atomic layer deposition results in a nanostructure that kinetically couples domains through surface hydrogen atom transfer, improving the selective oxidative dehydrogenation of propane. In contrast, other nanostructures, such as Pt on In2O3 or Pt mixed with In2O3, were unable to organize the reactions effectively, resulting in more propane combustion.
Article
Materials Science, Multidisciplinary
Chenliang Ye, Mao Peng, Yang Li, Dingsheng Wang, Chen Chen, Yadong Li
Summary: In this study, a PtSnZn/Al2O3 catalyst was synthesized using a stepwise method and showed excellent catalytic performance in propane dehydrogenation. Experimental and theoretical results revealed that the structure of PtSnZn clusters and the metal pairings play a crucial role in the catalytic performance.
SCIENCE CHINA-MATERIALS
(2023)
Article
Engineering, Environmental
Xiaofeng Gao, Wenhao Xu, Xing Li, Jiajie Cen, Yangzhi Xu, Lili Lin, Siyu Yao
Summary: Supported platinum-tin catalysts have been widely recognized for their excellent performance in propane dehydrogenation due to their high activity, selectivity, and stability. The nature of the active species in Pt-Sn catalysts is still debated. In this study, the spatial distribution of Pt and Sn species on Al2O3 was controlled by controlling the formation of Pt-Sn chloride complexes during the impregnation stage. The results showed that Pt clusters partially modified by reduced Sn exhibited higher activity and longer life-time compared to PtSn alloy counterparts.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Guo-Qing Yang, Xing Ren, Vita A. Kondratenko, Heng-Bo Zhang, Evgenii V. Kondratenko, Zhong-Wen Liu
Summary: This study investigates the effects of SnO2 promoter on the activity and selectivity of Pt/CeO2 catalyst in the oxidative dehydrogenation of propane with CO2. Increasing the Sn/Pt ratio leads to a decrease in propane conversion and an increase in propene selectivity, which can be explained by the increased electron density of Pt through the promoter. The Sn-modified Pt-O-Ce bonds are identified as the active sites for the reaction, occurring via a redox mechanism involving the activation of CO2 over oxygen vacancies at Sn-modified Pt and CeO2 boundaries.
Article
Engineering, Environmental
Sajjad Rimaz, Luwei Chen, Antonio Monzon, Sibudjing Kawi, Armando Borgna
Summary: The addition of Ca reduced the acid centers of Al2O3 and increased the degree of alloy formation, leading to enhanced propylene selectivity and catalyst stability. The Ca-promoted catalyst showed lower deactivation rate and higher residual activity compared to the non-promoted catalyst, resulting in better performance in terms of activity and selectivity at steady state conditions.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Oscar de la Iglesia, Miryan Sarango, Mikel Munarriz, Magdalena Malankowska, Alberto Navajas, Luis M. Gandia, Joaquin Coronas, Carlos Tellez
Summary: The mesoporous material Sn-In-MCM-41 was synthesized and used as a catalyst for the transformation of sugars to methyl lactate (ML). The Sn-In-MCM-41 catalyst showed better performance compared to Sn-MCM-41 and In-MCM-41 catalysts, with higher yields and good reusability. Furthermore, the use of Sn-In-MCM-41 also reduced environmental impacts compared to Sn-MCM-41.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Chemistry, Physical
Andres Sanz-Martinez, Javier Lasobras, Jaime Soler, Javier Herguido, Miguel Menendez
Summary: In this study, catalysts suitable for MTG processes in a fluidized bed reactor were prepared and characterized. Among the catalysts tested, the one containing boehmite as a binder showed the best performance in terms of mechanical strength, yield to aromatics, and yield to durene.
Article
Engineering, Chemical
Diego Zapater, Javier Lasobras, Jaime Soler, Javier Herguido, Miguel Menendez
Summary: This study investigated the effect of water on the performance of the methanol-to-olefins process, showing that feeding a mixture of methanol-water can increase the initial yield and production time of olefins.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Biotechnology & Applied Microbiology
Victor Berned-Samatan, Santiago Jimenez, Cesar Rubio, Carlos Tellez, Joaquin Coronas
Summary: This work focuses on the use of self-supported single-wall carbon nanotube (SWCNT) buckypapers as filters or membranes for reducing the concentration of pollutants in air or water streams. The fabrication of the buckypapers was achieved using a simple filtration method. The buckypaper demonstrated excellent performance in air filtration with a high permeance and filtration efficiency, and in water ultrafiltration with a good permeance and rejection rate. The control of ZIF-8 crystallization allowed for the synthesis of different-sized particles as reference solutes for ultrafiltration separation.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Inigo Martinez-Visus, Matias Ulcuango, Beatriz Zornoza, Joaquin Coronas, Carlos Tellez
Summary: Three synthesis procedures for the covalent-organic framework (COF) TpPa-1 were studied to find a faster and more environmentally friendly method. Microwave radiation shortened reaction times to 30 minutes while maintaining the structure and obtaining high yields. Water-assisted mechanochemical synthesis also achieved high crystallinity and yield for TpPa-1.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Lorena Paseta, Magdalena Malankowska, Carlos Telez, Joaquin Coronas
Summary: An alternative method for synthesizing ZIF-94 using NaOH as a deprotonator was developed in this study, which allowed for rapid crystallization and separation at room temperature. The resulting ZIF-94 had high crystallinity and a specific surface area of 485 m(2 g-1) at a crystallization yield of 66.9%.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Biochemistry & Molecular Biology
Victor Berned-Samatan, Carlos Tellez, Joaquin Coronas
Summary: Single-walled carbon nanotube buckypapers coated with a metal-organic framework ZIF-8 were used as supports for Pebax 3533 TFC membranes preparation via phase inversion and spin coating techniques. Proper characterization of the materials confirmed that the ZIF-8 layer prevented the penetration of the polymer selective film into the SWCNT-bp support, resulting in a highly permeable selective membrane. The spin-coating method proved to be more effective, with a CO2 permeance of 566 GPU and a CO2/N2 selectivity of 20.9.
Article
Engineering, Environmental
Jose Miguel Luque-Alled, Lidia Martinez-Izquierdo, Patricia Gorgojo, Carlos Tellez, Joaquin Coronas
Summary: TFC polyamide membranes with ZIF were prepared using a vapor phase interfacial polymerization method. These membranes showed improved water permeance and high rejection of organic dyes compared to the control membrane.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Javier Esteras-Saz, Oscar de la Iglesia, Izumi Kumakiri, Cristina Pena, Ana Escudero, Carlos Tellez, Joaquin Coronas
Summary: This study combines membrane osmotic distillation (OD) with hydrophobic-hydrophilic pervaporation (PV) to dealcoholize red wine and recycle water, generating bioethanol. The results show that this method can partially remove alcohol from red wine and reuse the extracted water, producing a mixture of ethanol and water. This has significant implications for the wine production industry.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Engineering, Chemical
Victor Berned-Samatan, Marten Piantek, Joaquin Coronas, Carlos Tellez
Summary: Nanofiltration technology is widely used in water treatment and solvent recovery due to its scalability, low energy consumption, environmental impact, and small footprint. This study presents a multilayer membrane structure with a polyamide selective layer interfacially polymerized on a sublayer of MOF ZIF-93 grown on single-walled carbon nanotubes, all within an asymmetric polyimide P84 support. The membrane exhibits excellent performance in water and organic solvent separation, as well as chlorine resistance and stability.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Environmental Sciences
Lourdes Jara-Cobos, Maria Eulalia Penafiel, Carolina Montero, Miguel Menendez, Veronica Pinos-Velez
Summary: Ti-pillared bentonites were used to remove ciprofloxacin (CIP) from aqueous solutions. Pillared sodium bentonite (BSP) and pillared calcium bentonite (BCP) were prepared and characterized. The results showed that pillared bentonites had increased surface areas compared to natural ones, with BSP having a more porous structure and higher adsorption capacity than BCP. Kinetic and isotherm studies revealed that CIP adsorption followed a pseudo second-order kinetic model, with multilayer adsorption observed. The pH influence study indicated that CIP adsorption occurred at pH levels commonly found in wastewater treatment.
Article
Engineering, Chemical
Javier Esteras-Saz, Lorena Paseta, Carlos Echaide-Gorriz, Magdalena Malankowska, Jose M. Luque-Alled, Beatriz Zornoza, Carlos Tellez, Joaquin Coronas
Summary: Thin film composite (TFC) hollow fiber (HF) membranes were synthesized using microfluidic interfacial polymerization technique. By reducing the monomer concentration and introducing hydrophilic metal-organic framework (MOF) ZIF-93, the water permeance of the membranes was significantly enhanced.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2023)
Article
Chemistry, Multidisciplinary
Victor Berned-Samatan, Lidia Martinez-Izquierdo, Elisa Abas, Carlos Tellez, Joaquin Coronas
Summary: A facile method for recycling the organic ligand from ZIF-94/SIM-1 with a high recovery yield of 92.5%+/-2.8% is reported in this study. The recycled ligand was used for synthesizing a new ZIF-94, which was then embedded in Pebax(R)1657 mixed matrix membranes for gas separation of CO2/N-2 and CO2/CH4.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Lidia Martinez-Izquierdo, Carlos Tellez, Joaquin Coronas
Summary: In this study, highly efficient thin-film nanocomposite membranes were successfully prepared by incorporating ionic liquid and metal organic framework into a polymer matrix. The addition of ionic liquid and metal organic framework significantly improved the CO2 permeance while slightly decreasing the CO2/N-2 separation selectivity. Long-term stability tests showed that the incorporation of metal organic framework enhanced the stability of the ionic liquid in the membrane.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Physical
Marvin Benzaqui, Mohammad Wahiduzzaman, Heng Zhao, Md Rafiul Hasan, Timothy Steenhaut, Ali Saad, Jerome Marrot, Perine Normand, Jean-Marc Greneche, Nicolas Heymans, Guy de Weireld, Antoine Tissot, William Shepard, Yaroslav Filinchuk, Sophie Hermans, Florent Carn, Magdalena Manlankowska, Carlos Tellez, Joaquin Coronas, Guillaume Maurin, Nathalie Steunou, Christian Serre
Summary: Iron(iii) carboxylate based metal organic frameworks (MOFs)/porous coordination polymers (PCPs) have attracted great interest due to their structural diversity, tunable porosity, stability, functionality, scalability, and green synthesis. This study presents a new Fe(iii) based PCP with one dimensional narrow pore channels decorated with polar groups, which shows moderate CO2 capacity and high CO2/N-2 selectivity. The compatibility of this MOF with elastomer block copolymer allows the production of mixed matrix membranes with improved CO2/N-2 separation performance.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
