Article
Chemistry, Physical
Adrian Martinez Gomez-Aldaravi, Cecilia Paris, Manuel Moliner, Cristina Martinez
Summary: Diverse Ni-zeolites with different physico-chemical properties and Ni speciation have been designed to study their influence on ethylene oligomerization. Different particle sizes, Si/Al ratios, and Ni-incorporation strategies have been used to synthesize Ni-containing medium-pore MFI and large-pore BEA zeolites. Ni2+ and NiO nanoclusters are found inside the zeolitic pores, depending on the incorporation method. The presence of Ni2+ mainly determines olefin oligomerization under near-ambient pressures, while crystal size, acidity, and Ni incorporation methodology play key roles under high-pressure reaction conditions.
JOURNAL OF CATALYSIS
(2023)
Article
Chemistry, Applied
Jinghua Xu, Ruifeng Wang, Yaru Zhang, Lin Li, Wenjun Yan, Junying Wang, Guodong Liu, Xiong Su, Yanqiang Huang, Tao Zhang
Summary: Two types of Ni active sites were identified on amorphous silica-alumina supports with different contents of Al2O3 loadings in relation to their activities in ethylene oligomerization. The concentration of Ni2+ species on acidic silanols increased as the Al2O3 loading decreased, leading to easier evolution into Ni+ species, which are identified as the active sites.
CHINESE JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
Jinghua Xu, Ruifeng Wang, Lirong Zheng, Junguo Ma, Wenjun Yan, Xiaofeng Yang, Junying Wang, Xiong Su, Yanqiang Huang
Summary: The study investigated the nature of Ni active sites using Ni supported on alumina-silica as the catalyst, and found that Ni+ sites exhibit unprecedented activity in ethylene oligomerization, potentially directly participating in the formation of active sites.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Omar Abed, Hend Omar Mohamed, Idoia Hita, Vijay Velisoju, Natalia Morlanes, Omar El Tall, Pedro Castano
Summary: This study compares the effects of different catalyst structures on adsorption and catalysis, exploring the roles of pore topology, Ni sites, and acid sites. The results show that acid sites are particularly important during the initial stages of the reaction, and using a continuous reactor alone may lead to misinterpretation. Ni accelerates the reaction and improves the selectivity towards oligomers. Based on the experimental results, the dominant mechanisms over the different catalyst sites and reaction times are discussed.
Article
Chemistry, Multidisciplinary
Y. Shi, W. Gao, G. Wang, J. Fan, C. Wang, F. Wang, Y. He, X. Guo, S. Yasuda, G. Yang, N. Tsubaki
Summary: An efficient bifunctional ZnCr2O4-ZSM-22 catalyst was developed for direct conversion of CO2 to ethylene, achieving 24.0% ethylene selectivity and 21.9% CO2 conversion. The catalyst exhibited a high ethylene/light olefin ratio of over 93% and demonstrated superior stability with no significant deactivation over 60 hours. The study systematically investigated the effects of various factors on the catalytic performances, providing a new avenue for CO2 conversion to ethylene.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Engineering, Environmental
Hend Omar Mohamed, Vijay K. Velisoju, Idoia Hita, Omar Abed, Rajesh K. Parsapur, Naydu Zambrano, Mohamed Ben Hassine, Natalia Morlanes, Abdul-Hamid Emwas, Kuo-Wei Huang, Pedro Castano
Summary: By using the in situ modified zeolite technique, researchers have successfully developed an efficient catalyst with high Ni2+ species concentration and good dispersion, which can improve the yield and stability of 1-butene while reducing the formation of by-products.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Jiangping Long, Suyang Tian, Sheng Wei, Hongqiao Lin, Guiwen Shi, Xupeng Zong, Yanhui Yang, Dan Yang, Yu Tang, Yihu Dai
Summary: Moderate steaming pre-treatment can enhance the catalytic activity of Co-containing zeolite catalysts, improving the specific reaction rate and propylene selectivity in non-oxidative propane dehydrogenation (PDH) reaction.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Environmental
Nagendra Kulal, Rajappan Vetrivel, Chinnakonda S. Gopinath, Rahul K. Ravindran, Vinod N. Rao, Manjunath Shetty, R. Shrikanth, Dinesh Rangappa, Ganapati V. Shanbhag
Summary: The reaction between n-alkylamine and CO2 has been analyzed using Mathematica, leading to the discovery of the Sn-Ni oxide as a more effective catalyst due to its mixed state of NiO and SnO2. FT-IR adsorption study helped in deriving a plausible mechanism for this reaction, showing that the Sn1.1-Ni-O-600 catalyst performed well under optimized conditions.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Zhipeng Yu, Chaowei Si, Alec P. LaGrow, Zhixin Tai, Wolfgang A. Caliebe, Akhil Tayal, Maria J. Sampaio, Juliana P. S. Sousa, Isilda Amorim, Ana Araujo, Lijian Meng, Joaquim L. Faria, Junyuan Xu, Bo Li, Lifeng Liu
Summary: This study reports a bimetallic iridium-iron diatomic catalyst (IrFe-N-C) that exhibits excellent performance in oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) and is used in zinc-air batteries.
Article
Chemistry, Physical
Gabriel V. S. Seufitelli, Jason J. W. Park, Phuong N. Tran, Anthony Dichiara, Fernando L. P. Resende, Rick Gustafson
Summary: This study investigates the adsorption of ethylene on Ni-H-Beta particles to understand the roles of nickel and Bronsted sites in the catalytic oligomerization of ethylene. The results suggest the participation of two active sites in the formation of Cossee-Arlman centers and the dissociation of ethylene upon adsorption. Further characterization reveals the presence of highly dispersed Ni2+ on the catalyst surface and the interaction with lattice oxygen and free NiO crystals. The presence of residual Ni2+ and Bronsted sites hinders the formation of nickel-hydride sites and the conversion rate of ethylene. The proposed mechanism involves adsorption of ethylene on Ni2+ and a Bronsted site. This research has important implications for improving ethylene oligomerization processes over nickel-based heterogeneous catalysts.
Article
Chemistry, Applied
Xin Ning, Junwen Chen, Qi Zuo, Wenlin Li, Jiajun Zheng, Ruifeng Li
Summary: Light alkenes oligomerization is an important method for producing clean jet fuels, but the current catalyst used for 1-hexene oligomerization has low activity and selectivity. In this study, an efficient and selective IM-5 zeolite-derived catalyst system was developed for 1-hexene oligomerization. Treatment with an aqueous NH4F solution resulted in dealumination of IM-5 zeolite without structure degradation. The NH4F-treated IM-5 zeolite exhibited enhanced acidity and showed rapid diffusion ability. The strong Brunsted acid sites in the catalyst promoted both cracking and oligomerization reactions. The contact time and partial pressure between 1-hexene and IM-5 zeolite were analyzed to understand the competition of cracking reactions. High conversion of 1-hexene, optimal oligomerization ratio, and reasonable stability were achieved using the etched IM-5 catalyst.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Wanting Li, Cunhui Zhou, Wenqian Li, Lixia Ge, Gan Yu, Minghuang Qiu, Xinqing Chen
Summary: In this study, a series of bifunctional Ni/Al-MCM-41 catalyst samples with carefully controlled location of Ni sites were successfully prepared. Various characterization techniques were used to reveal the Ni site distributions and properties of the catalysts. The experimental results showed that the location of Ni sites had a significant impact on the catalytic performance.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Nanoscience & Nanotechnology
Yaqian Dong, Zhi Fang, Weiyou Yang, Bin Tang, Qiao Liu
Summary: This study presents a facile strategy to fabricate amorphous cobalt/nickel sulfide nanoflake arrays as integrated bifunctional electrocatalysts for efficient water splitting. The obtained catalyst exhibits excellent activities for both the oxygen evolution reaction and the hydrogen evolution reaction in alkaline solution. As an anode and a cathode in an alkaline electrolyzer, this catalyst shows low cell voltage and high water splitting current.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Kewei Yu, Sanjana Srinivas, Cong Wang, Weiqi Chen, Lu Ma, Steven N. Ehrlich, Nebojsa Marinkovic, Pawan Kumar, Eric A. Stach, Stavros Caratzoulas, Weiqing Zheng, Dionisios G. Vlachos
Summary: We report the synthesis, optimization, and characterization of Co/SiO2 catalyst for ethane nonoxidative dehydrogenation. High-temperature pretreatment enhances the initial activity of the catalyst, and highly dispersed Co(II) clusters are found to have higher activity than Co0 or CoOx nanoparticles. Additionally, high-temperature treatment increases the density of active acid sites.
Article
Chemistry, Applied
Wenkai Wang, Shiyou Xing, Haoran Yuan, Jun Xie, Gaixiu Yang, Pengmei Lv
Summary: The effect of thermal pretreatment on the bifunctional NiW catalyst and its hydrodeoxygenation (HDO) performance on oleic acid were studied. It was found that increasing the calcination temperature led to particle growth and segregation of W on the catalyst surface, while the reduction temperature could tune the catalyst surface composition. The highest W delta+/Ni0 ratio was achieved at 550 degrees C and 700 degrees C for CT and RT, respectively, resulting in an impressive deoxygenation rate of 95.1% at 300 degrees C. The catalyst showed higher activity than non-precious catalysts and even comparable to precious ones. However, the HDO activity was decreased when using an acidic substrate like oleic acid due to metal leaching.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Chemistry, Physical
Ruben Ramos, Jose M. Hidalgo, Michael Gonel, Zdenek Tiser, Francine Bertella, Agustin Martinez, Oleg Kikhtyanin, David Kubicka
CATALYSIS COMMUNICATIONS
(2018)
Article
Chemistry, Physical
Sara Moussa, Patricia Concepcion, Maria A. Arribas, Agustin Martinez
Article
Chemistry, Physical
G. M. Cabello Gonzalez, R. Murciano, A. L. Villanueva Perales, A. Martinez, F. Vidal-Barrero, M. Campoy
APPLIED CATALYSIS A-GENERAL
(2019)
Article
Chemistry, Applied
G. M. Cabello Gonzalez, P. Concepcion, A. L. Villanueva Perales, A. Martinez, M. Campoy, F. Vidal-Barrero
FUEL PROCESSING TECHNOLOGY
(2019)
Article
Chemistry, Physical
Francine Bertella, Christian W. Lopes, Alexandre C. Foucher, Giovanni Agostini, Patricia Concepcion, Erich A. Stach, Agustin Martinez
Article
Chemistry, Applied
Sophia Mohammadnasabomran, Ahmad Tavasoli, Yahya Zamani, Carlos Marquez-Alvarez, Joaquin Perez-Pariente, Agustin Martinez
FUEL PROCESSING TECHNOLOGY
(2020)
Article
Engineering, Chemical
Sara Escorihuela, Fidel Toldra-Reig, Sonia Escolastico, Raul Murciano, Agustin Martinez, Jose Manuel Serra
Summary: By depositing a Cu-based protective layer on the surface of self-supported palladium tubular membranes, selective and controlled addition of H-2 can be achieved in Fischer-Tropsch synthesis, increasing hydrocarbon yield and reducing methane formation.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Chemistry, Physical
Sara Moussa, Patricia Concepcion, Maria A. Arribas, Agustin Martinez
APPLIED CATALYSIS A-GENERAL
(2020)
Article
Chemistry, Applied
G. M. Cabello Gonzalez, A. L. Villanueva Perales, M. Campoy, J. R. Lopez Beltran, A. Martinez, F. Vidal-Barrero
Summary: A kinetic model has been developed to describe the one-step conversion of ethanol into 1,3-butadiene over a mixed catalyst, taking into account the effect of water content on catalyst performance. The model, validated using experimental data, can predict the formation of major and minor compounds accurately, with room for improvement in predicting certain products. This modelling approach is expected to be applicable to other one-step catalysts.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Applied
G. M. Cabello Gonzalez, A. L. Villanueva Perales, A. Martinez, M. Campoy, F. Vidal-Barrero
Summary: This paper investigates key issues in the design of industrial ethanol to 1,3-butadiene two-step processes, with a focus on the performance of Ta-SBA-15 catalyst under different operating conditions and the influence of water on catalyst stability. The results reveal complex interacting effects between reaction conditions and emphasize the importance of careful selection to optimize catalyst performance.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Physical
Mercedes Boronat, Maria J. Climent, Patricia Concepcion, Urbano Diaz, Hermenegildo Garcia, Sara Iborra, Antonio Leyva-Perez, Lichen Liu, Agustin Martinez, Cristina Martinez, Manuel Moliner, Joaquin Perez-Pariente, Fernando Rey, Enrique Sastre, Pedro Serna, Susana Valencia
Summary: This article introduces the significant contributions of Prof. Avelino Corma in the field of heterogeneous catalysis and materials science. It highlights his remarkable achievements in areas such as solid catalysts, materials synthesis, and photochemistry. The article also emphasizes the importance of the research methods and paradigms developed by Avelino and his team in addressing new scientific challenges in building a sustainable world.
Article
Chemistry, Physical
Jaroslav Aubrecht, Violetta Pospelova, Agustin Martinez, Patricia Concepcion, Oleg Kikhtyanin, Petr Straka, David Kubicka
Summary: This study investigated the structural transformation of five CuZnAl catalysts with different Cu/Zn and Al/(Cu+Zn) atomic ratios. It was found that the catalyst with lower Cu loading exhibited higher activity after reduction.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Physical
Sophia Mohammadnasabomran, Carlos Marquez-Alvarez, Joaquin Perez-Pariente, Agustin Martinez
Summary: Grafting aluminum onto SBA-15 improves Co dispersion and results in a more homogeneous distribution of metal species. However, the Al-grafted CoRu/Al-SBA-15 catalyst shows lower activity in Fischer-Tropsch synthesis compared to the all-silica CoRu/SBA-15 counterpart, but exhibits enhanced selectivity towards liquid hydrocarbons.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Natalia Suarez, Maria A. Arribas, Andres Moreno, Agustin Martinez
CATALYSIS SCIENCE & TECHNOLOGY
(2020)
Review
Chemistry, Multidisciplinary
Mariya Shamzhy, Maksym Opanasenko, Patricia Concepcion, Agustin Martinez
CHEMICAL SOCIETY REVIEWS
(2019)
Article
Chemistry, Physical
Ming-Yi Chen, Ngoc Thanh Thuy Tran, Ahmed Abubakar Alao, Wen-Dung Hsu
Summary: This study demonstrates the significance of surface Pt atom arrangement for the efficiency of ORR in PEMFCs and reveals the correlation between Pt-Pt average distance and O2 dissociation barrier. Furthermore, the study discovers a robust correlation between the level of the catalyst's d-band center and O2 adsorption energy. High-entropy alloy substrates provide potential for controlling Pt arrangement and O2 dissociation barrier.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Eduardo C. Atayde Jr, Babasaheb M. Matsagar, Yu-Cheng Wang, Kevin C. -W. Wu
Summary: This study presents the first application of an acidic MOF, Sulfated MOF-808, in catalyzing the HAA reactions of furan oligomers for the production of biofuel precursors. The catalyst showed high yield, selectivity, and recyclability, making it versatile for different starting materials.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Maria do Carmo Rangel, Francieli Martins Mayer, Soraia Jesus de Oliveira, Sergio Gustavo Marchetti, Fabricio Luiz Faita, Doris Ruiz, Giovanni Saboia, Mariana Kieling Dagostini, Jonder Morais, Maria do Carmo Martins Alves
Summary: This study developed a new catalyst by investigating the effect of magnesium on the catalytic properties of hematite in ethylbenzene dehydrogenation. The catalyst showed important differences in activity, selectivity, and stability, making it a promising candidate for commercial applications.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yanjun Li, Qian Wang, Hui Tian, Mingyuan Zhu, Yuanyuan Liu
Summary: A novel strategy using microwave-assisted precipitation was proposed to prepare defective CsH3PMo11VO40 catalyst for the oxidation of methacrolein to methacrylic acid. Microwave treatment accelerates crystallization, increases vanadyl species content, and forms defective Keggin structures, thereby enhancing the oxidation capacity of the catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Rajeshwari Athavale, Sailee Gardi, Fatima Choudhary, Dayanand Patil, Nandkishor Chandan, Paresh More
Summary: In this study, a novel acidic ionic liquid catalyst was prepared and used for the synthesis of bis-indolyl methane derivatives. The catalyst exhibited short reaction times, easy purification, and reusability.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Masatomo Hattori, Takato Hattori, Masakuni Ozawa
Summary: Cu-added gamma-Al2O3 catalysts were prepared with varying Cu loadings and the effects of copper oxidation states on catalytic activity were investigated. The results showed that the addition of copper increased the catalyst activity, but excessive copper loading decreased catalytic activity. XRD and TEM analysis indicated the formation of a solid solution of copper oxide species on the surface of gamma-Al2O3. XAS and TPR data demonstrated variations in copper oxidation states among the catalysts.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liwei Fang, Shiyang Niu, Shengsen Wang, Yiqing Lu, Yuanhui Cheng
Summary: In this study, PtNi alloy on nitrogen-doped carbon and SnO2 dual-support was designed to modulate the metal-support interaction, resulting in improved catalytic activity and stability for oxygen reduction reaction. The SnO2/PtNi/NC catalyst exhibited a strongly coupled interface, enhanced electron transfer, and higher half-wave potential compared to PtNi/NC and commercial Pt/C.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Shohei Harada, Duanxing Li, Kenta Iyoki, Masaru Ogura
Summary: This study investigates the catalytic performance of a composite catalyst composed of ZnZrOX and H-zeolite for the hydrogenation of CO2. The deactivation of the composite catalyst is influenced by ion exchange of Zn2+ and/or coke, with their effects differing based on the zeolite structure. Separating the grains of the composite catalyst can prevent deactivation.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Laura Proano, Christopher W. Jones
Summary: In this study, NiGa alloy particles supported on CeO2, ZrO2, and ZrO2-CeO2 solid solutions were prepared and characterized. The nature of the support was found to have a significant influence on the catalyst's activity and selectivity, with the crystalline structure of ZrO2 having the greatest impact. Pure ZrO2 showed the highest methanol selectivity and CO2 conversion at high Zr:Ce ratios. In equimolar and Ce-rich conditions, basic sites and oxygen vacancies were found to be the key parameters affecting methanol production.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liyan Zhang, Yinze Yang, Leilei Zhou, Fengyu Zhao, Haiyang Cheng
Summary: 1,6-Hexamethylenediamine was successfully synthesized via the reductive amination of 1,6-hexanediol using a Ru/PRL(x)-Al2O3 catalyst. The highly dispersed and anchored Ru species, formed by 1,10-phenanthroline (PRL), played a crucial role in the catalytic reaction. The formation of new acid-base pairs, electron deficient Ru species, and smaller nanoparticles contributed to the improved catalytic performances of the Ru/PRL-Al2O3 catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Anita Horvath, Miklos Nemeth, Andrea Beck, Gyorgy Safran, Valeria La Parola, Leonarda Francesca Liotta, Gregor Zerjav, Matevz Roskaric, Albin Pintar
Summary: This study investigates the catalytic and structural changes caused by the addition of 0.25 wt% indium in a 3% Ni/CeO2-Al2O3 catalyst prepared by impregnation method. The results show that the addition of indium can decrease the activity of the catalyst, but it improves its stability and reduces coking.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Ankush Kularkar, Vaibhav Vilas Khedekar, Sachin D. Chaudhari, Mudavath Ravi, Sadhana S. Rayalu, Penumaka Nagababu
Summary: Efficiently addressing the challenges of photocatalytic CO2 reduction to CH3OH is crucial. This study developed Zn-BTC MOF and its composites with CaIn2S4, achieving highly efficient and robust photocatalytic CO2 reduction to CH3OH under ambient conditions, using H2O2 as the hydrogen source. Among the composites, ZMCIS4 demonstrated excellent performance with a CH3OH evolution of 49100 μmol/g.cat and a quantum efficiency of approximately 78.41%. The enhanced performance was attributed to the production of nascent hydrogen atoms (H center dot) through the photo-splitting of H2O2 on the ZMCIS surface.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Dan Liu, Yudong Li, Chengyu Wang, Haiyue Yang, Rong Wang, Shujun Li, Xiaohui Yang
Summary: In this study, a self-supporting three-dimensional porous Co3O4 nanobelt array decorated on nickel foam (P-Co3O4 -NBA@NF) electrode with numerous active sites was successfully constructed for the oxidation of 5-Hydroxymethylfurfural (HMF) to 2,5-furan dicarboxylic acid (FDCA). The P-Co3O4 -NBA@NF electrode demonstrated high conversion efficiency, selectivity, and Faraday efficiency, as well as remarkable long-term stability. This research provides a promising electrocatalyst for biomass conversion.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yimin Li, Enggah Kurniawan, Fumiya Sato, Takayoshi Hara, Yasuhiro Yamada, Satoshi Sato
Summary: In this study, several silica-alumina catalysts modified with Ag were examined for the dehydration of 1,3-butanediol to 1,3-butadiene. Among them, an amorphous silica-alumina catalyst (SAL-3) modified with Ag showed the highest improvement in catalytic activity and stability when operated in H2 flow. The generation of reversible acid sites was found to be the reason behind the enhanced activity and stability of this Ag/SAL-3 catalyst. The effects of various parameters on the catalytic activity of Ag/SAL-3, such as reaction temperature, contact time, Ag content, and carrier gas, were investigated.
APPLIED CATALYSIS A-GENERAL
(2024)