Article
Engineering, Environmental
Zhen Zhao, Jing Ma, Min Li, Wei Liu, Xiaodong Wu, Shuang Liu
Summary: This study investigated the reducibility and activity of three Ag/CeO2 model catalysts with different types of silver species supporting on CeO2. The results showed that silver facilitated the generation of oxygen species on CeO2 through two pathways, leading to boosted soot combustion efficiency.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Green & Sustainable Science & Technology
J. Voglar, J. Terzan, A. Kroflic, M. Hus, B. Likozar
Summary: This article reviews the research progress in the selective catalytic reduction (SCR) of nitrogen oxides (NOX) using ammonia as a reducing agent. It highlights the limitation of existing models in neglecting the adsorption of water on catalyst surfaces, which reduces their accuracy under high water vapor concentrations. The introduction of numerical fluid dynamics simulations (CFD) can overcome this limitation and consider the adsorption of relevant species at the catalyst's active sites.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Review
Chemistry, Physical
Magdalena Jablonska
Summary: This review provides an overview of the application of steady-state isotopic transient kinetic analysis in the selective catalytic reduction of NOx, focusing on identifying active species in different SCR reactions. It discusses the formation rates of adsorbed species and their role in elementary steps on the catalyst's surface, emphasizing on the optimization and design of industrial catalysts.
Article
Chemistry, Physical
Elisabetta Maria Cepollaro, Renata Botti, Giorgia Franchin, Luciana Lisi, Paolo Colombo, Stefano Cimino
Summary: Geopolymer-based monoliths were investigated as structured catalysts for NH3-SCR of NOx, showing good activity and high selectivity to N-2. The monolithic catalysts preserved the Cu-exchanged zeolite features and exhibited excellent mechanical strength, demonstrating hierarchical structure and good performance in reducing nitrogen oxides.
Article
Chemistry, Physical
Han Sun, Fei Han, Lu Sun, Shinya Mine, Takashi Toyao, Yunpeng Liu, Zhonghua Wu, Masaaki Kitano, Masaya Matsuoka, Weiwei Liu, Yongqiang Dai, Meiqing Shen, Haijun Chen
Summary: Selective catalytic reduction by methanol (Methanol-SCR) is a promising technology for treating exhaust with high concentration of sulfur. A new catalyst of nano-bismuth oxide implanted FER zeolites (Bi-FER) has been successfully synthesized, showing a lower optimum reaction temperature compared to existing technology. The reactivity of methyl groups generated on Brønsted acid sites neighboring with nano-bismuth oxide has been found to be highly effective for NOx removal. Therefore, a strategy of methanol activation to produce reactive methyl groups has been proposed for improving Methanol-SCR catalysts.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Review
Chemistry, Physical
Fabien Can, Xavier Courtois, Daniel Duprez
Summary: This review provides a general overview of the recent use of tungsten-based catalysts for various environmental applications, highlighting the tunable behaviors of tungsten oxide materials and their interactions with other compounds. The review is divided into five main parts, covering the structure, acidity, and applications of WO3-based catalysts in environmental remediation.
Article
Energy & Fuels
Chaolu Wen, Yanxia Guo, Kezhou Yan, Huirong Zhang
Summary: The production of spent honeycomb V2O5-WO3/TiO2 catalysts has caused serious environmental hazards. This study focused on the changes of typically spent catalysts from pulverized coal (PC) and circulating fluidized bed (CFB) boiler deNOx systems, including morphologies, pore structure, chemical composition, carrier, and active components properties. The major deactivation factors were pore blockage caused by fly ash and sulfur deposition, with CFB catalysts being more easily deactivated due to severe pore structure loss. The transformation of anatase to rutile TiO2 and the shift in valence state of V were major contributors to irreversible deactivation. This research provides valuable insights into the deactivation mechanism and potential recycling of spent catalysts.
Article
Chemistry, Physical
Imane El Arrouji, Cuirong Chen, Jamil Toyir, Cherif Larabi, Kai C. Szeto, Aimery de Mallmann, Mostafa Taoufik, Abdallah Oulmekki
Summary: A series of HPW/CeO2 catalysts with different tungsten loadings were prepared and characterized, showing that low loading of tungsten resulted in mainly isolated sites, while high tungsten loading produced polymeric or tungsten clusters. These catalysts displayed high activity in NH3-SCR of NOx, with 2% HPW/CeO2 demonstrating the highest activity and N2 selectivity.
Article
Chemistry, Physical
Charlotte Croise, Remy Pointecouteau, Joudia Akil, Alain Demourgues, Nicolas Bion, Xavier Courtois, Fabien Can
Summary: The study found that partial substitution of zirconium for praseodymium in a ceria-zirconia support can enhance the support reducibility, but impregnation of niobium and tungsten inhibits the redox behaviors. Additionally, niobium and tungsten provide acidic sites while praseodymium inhibits ammonia storage and decreases deNO(x) performances. The various redox and acidic behaviors observed in the studied materials demonstrate a strong competition between NOx SCR and NH3 oxidation pathways.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Applied
Yang Zhang, Chenghang Zheng, Shaojun Liu, Weihong Wu, Zhen Du, Min Yan, Wentao Zhu, Yue Zhu, Xiang Gao
Summary: The study found that catalysts in coal-fired power plants gradually lose effectiveness over their lifespan, mainly due to a decrease in active ingredients, metal deposition in flue gas, and a reduction in catalyst surface area.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Applied
Yangyang Mi, Gang Li, Yuling Zheng, Yiwei Luo, Wenming Liu, Zhenguo Li, Daishe Wu, Honggen Peng
Summary: A novel hierarchical porous Cu-SAPO-34-Meso zeolite, synthesized by a one pot dual-template strategy, exhibited remarkable deNOx performance and SO2 resistance, making it a promising candidate for real diesel emission control applications.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Biochemistry & Molecular Biology
Agnieszka Szymaszek-Wawryca, Urbano Diaz, Bogdan Samojeden, Monika Motak
Summary: The application of layered zeolites of MWW topology in environmental catalysis, especially in selective catalytic reduction with ammonia (NH3-SCR), has been receiving increasing attention. In this study, Fe-modified NH3-SCR catalysts supported on MCM-22, MCM-36, and ITQ-2 were synthesized via a one-pot method for the first time. The results showed a correlation between the arrangement of MWW layers and the form of iron in the zeolitic structure. The one-pot synthesis resulted in high dispersion of Fe3+ sites, leading to enhanced low-temperature activity and prevention of N2O generation. Fe-modified MCM-36 exhibited the most satisfactory activity with 50% NO reduction at 150 degrees C.
Article
Chemistry, Physical
Dongdong Chen, Huarong Lei, Wuwan Xiong, Ying Li, Xiang Ji, Jia-Yue Yang, Baoxiang Peng, Mingli Fu, Peirong Chen, Daiqi Ye
Summary: This study demonstrates that phosphorus (P) originating from lubricant oil additives or biofuels can lead to severe deactivation of Pd-SSZ-13 zeolites in automotive exhaust after-treatment systems. The loss of isolated Pd sites, specifically [Pd(OH)]+ and Pd2+, due to P-poisoning was found to be the primary reason for deactivation. In situ studies suggest that [Pd(OH)]+ is more susceptible to P-poisoning than Pd2+, leading to migration of [Pd(OH)]+ to the zeolite surface and subsequent formation of inactive metaphosphate and bulk PdOx species.
Article
Chemistry, Physical
Przemyslaw J. Jodlowski, Izabela Czekaj, Patrycja Stachurska, Lukasz Kuterasinski, Lucjan Chmielarz, Roman J. Jedrzejczyk, Piotr Jelen, Maciej Sitarz, Sylwia Gorecka, Michal Mazur, Izabela Kurzydym
Summary: The study prepared Y-, USY- and ZSM-5-based catalysts through hydrothermal synthesis, followed by copper active-phase deposition. Experimental results revealed the impact of different preparation methods on reaction activity and stability.
Article
Engineering, Environmental
Brian M. Everhart, Bailey McAuley, Ahmed Al Mayyahi, Bade Tonyali, Umut Yucel, Placidus B. Amama
Summary: Although a majority of photocatalysts exhibit improved NO conversion to NO2, the performance in the oxidation of NO2, the more toxic form of NOx, to nitrate remains a challenge. This study demonstrates the use of carbon nanotube-TiO2 (CNT-TiO2) photocatalyst films for effective transformation of NOx into nitrates. The conditions probed include relative humidity (RH), initial NOx concentration, reactor geometry (headspace distance), and state of the catalyst (fresh vs. recycled). Our findings highlight the importance of headspace distance, a parameter that has mostly been overlooked in reactor design for photocatalytic oxidation of NOx, but which dictates the optimal catalyst configuration for flue gas treatment.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Applied
Claudiu Rizescu, Chao Sun, Ionel Popescu, Adriana Urda, Patrick Da Costa, Ioan-Cezar Marcu
Summary: M-MgAlO mixed oxide catalysts were prepared by controlled thermal decomposition of layered double hydroxides (LDH) precursors and tested in the hydrodeoxygenation of benzyl alcohol. Among them, Cu15MgAlO showed the best catalytic performance for alcohol conversion and selectivity to toluene.
Article
Chemistry, Applied
Katarzyna Swirk Da Costa, Hailong Zhang, Shanshan Li, Yaoqiang Chen, Magnus Ronning, Monika Motak, Teresa Grzybek, Patrick Da Costa
Summary: Yttrium promotion in Ni/Mg/Al double-layered hydroxides leads to improved reducibility of Ni species and total basicity, resulting in higher CH4 and CO2 conversions in dry reforming of methane. However, this also leads to significant carbon deposits, with NiY8-DLH showing the best catalytic stability.
Article
Chemistry, Physical
Chao Sun, Katarzyna Swirk Da Costa, Dominik Wierzbicki, Monika Motak, Teresa Grzybek, Patrick Da Costa
Summary: Ni-containing mixed oxides derived from layered double hydroxides with various amounts of yttrium exhibited excellent catalytic activity, especially in the moderate temperature region. Modification with different amounts of yttrium had a positive effect on the catalytic performance and CO2 conversion rate, leading to mixed oxides with stronger affinity and smaller crystallite size.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Katarzyna Swirk Da Costa, Magnus Ronning, Monika Motak, Teresa Grzybek, Patrick Da Costa
Summary: The Ni-based Mg/Al double-layered hydroxides co-precipitated with Zr and impregnated with Y showed better performance in dry reforming of methane compared to the unpromoted material. Yttrium promotion favored regeneration of the catalytic bed, leading to decreased formation of unreactive coke.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Katarzyna Swirk, Ye Wang, Changwei Hu, Li Li, Patrick Da Costa, Gerard Delahay
Summary: ZrO2 catalysts promoted by copper and iron were prepared using one-pot synthesis with urea. Characterized by various methods, the Fe-Zr sample showed the most promising results in NH3-SCR, being active and highly selective to N-2, especially in the presence of SO2.
Article
Chemistry, Applied
Paulina Summa, Bogdan Samojeden, Monika Motak, Dominik Wierzbicki, Ivo Alxneit, Konrad Swierczek, Patrick Da Costa
Summary: This research focuses on a Ni-Mg-Al hydrotalcite-derived catalyst promoted with Cu for CO2 hydrogenation to methane. The Cu promotion was especially effective at low temperatures, leading to significant CO2 conversion and selectivity for methane formation. Higher Cu content did not necessarily result in better activity, as high Cu concentrations were found not to be suitable for CO2 methanation. Additionally, the formation of Ni-Cu solid solution and subsequent redispersion of Ni-Cu alloy during the methanation reaction were observed.
Article
Chemistry, Physical
Katarzyna Swirk Da Costa, Paulina Summa, Dominik Wierzbicki, Monika Motak, Patrick Da Costa
Summary: In this study, a series of V-promoted hydrotalcite-derived nickel catalysts were tested for CO2 methanation, with Ni-I-V2.0 showing the highest catalytic activity at 2.0 wt% vanadium loading. XRD and XANES analyses revealed the smallest Ni0 particles in Ni-I-V2.0 and improved textural features, while CO2TPD showed the highest sum of weak and medium basic sites in Ni-I-V2.0 that can positively influence catalytic behavior.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Bo Wang, Maria Mikhail, Simeon Cavadias, Michael Tatoulian, Patrick Da Costa, Stephanie Ognier
Summary: The study found that catalysts with larger particle sizes led to higher CO2 conversion rates due to smaller metallic Ni particle sizes, less gas maldistribution, and better plasma homogeneity. Increasing the pressure drop in the reactor slightly increased CO2 conversion rates while decreasing plasma power by 30%.
JOURNAL OF CO2 UTILIZATION
(2021)
Article
Chemistry, Physical
Cristian Yesid Chaparro-Garnica, Esther Bailon-Garcia, Arantxa Davo-Quinonero, Patrick Da Costa, Dolores Lozano-Castello, Agustin Bueno-Lopez
Summary: Researchers have demonstrated that 3D printing allows for the creation of high-performance carbon integral monoliths with a complex network of interconnected channels, outperforming conventional catalysts in heterogeneous catalysis reactions. This novel design enhances the CO2 methanation rate by 25% at 300 degrees C due to the forced turbulent flow into the channels network, opening up new synthesis options for tailored heterogeneous catalysts.
Article
Chemistry, Multidisciplinary
Ye Wang, Yannan Wang, Li Li, Chaojun Cui, Xudong Liu, Patrick Da Costa, Changwei Hu
Summary: Al promotion plays a positive role in improving the reactivity of NiO-ZrO2 catalyst in CO2 reforming, mainly reflected in improving the surface properties of the catalyst, increasing the resistance to sintering, and inhibiting nickel loss. This new preparation method is expected to achieve better results in the field of low-carbon energy.
Article
Chemistry, Physical
Golshid Hasrack, Maria Carmen Bacariza, Carlos Henriques, Patrick Da Costa
Summary: In recent years, carbon dioxide hydrogenation has been proposed as a promising technology for stabilizing anthropogenic greenhouse gas emissions by producing synthetic fuels and value-added molecules. This study investigated the effects of cobalt promotion on thermal CO2 methanation and non-thermal plasma (NTP)-assisted CO2 methanation using 15Ni/CeO2 catalysts with 1% and 5% cobalt. The promotion effect of cobalt was observed in both plasma and thermal reactions and was mainly attributed to the basic properties of the materials.
Article
Thermodynamics
Natalia Czuma, Bogdan Samojeden, Katarzyna Zarebska, Monika Motak, Patrick Da Costa
Summary: This study explores a novel approach to prepare catalysts for CO2 methanation by using waste fly ashes as support. The use of mechanical energy enables efficient conversion, offering promising results and economic benefits. This approach aligns with the concept of circular economy and promotes waste reuse.
Article
Chemistry, Physical
Minh Nguyen-Quang, Federico Azzolina-Jury, Bogdan Samojeden, Monika Motak, Patrick Da Costa
Summary: In this work, a series of NiMgAl oxides derived from hydrotalcite catalysts were prepared using different techniques and tested for CO2 methanation. The NMA-UH catalyst prepared by urea hydrolysis showed high and stable catalytic activity in terms of CO2 conversion and CH4 selectivity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Minh Nguyen-Quang, Federico Azzolina-Jury, Bogdan Samojeden, Monika Motak, Patrick Da Costa
Summary: This work studied the effects of Ca and Ba on Polymer P123-modified NiMgAlOx-mixed oxide catalysts in thermal and plasma CO2 methanation. Both elements influenced the ba-sicity and redox properties of the catalyst. Ni15Ca1 showed enhanced performance in plasma, achieving high efficiency and conversion to methane, while Ni15Ba1 was effective in conventional tests. Optimized concentration of Ca at 1 wt% resulted in improved plasma performance.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Energy & Fuels
Katarzyna Swirk Da Costa, Paulina Summa, Jithin Gopakumar, Youri van Valen, Patrick Da Costa, Magnus Ronning
Summary: This study investigated the influence of yttrium (Y) modification on the catalytic performance of nickel-based KIT-6-supported catalysts. The results showed that the addition of yttrium increased the catalyst's basicity, reduced deactivation, and improved syngas production stability. XAS-XRD analysis demonstrated that yttrium facilitated the reduction of Ni2+ to Ni-0 at lower temperatures, and the reduction rate correlated linearly with that of NiO. The effect of yttrium on the reduction rate differed for species with different interactions with the support. Furthermore, the yttrium-modified catalysts exhibited resistance to sintering of Ni particles and remained fully reduced under excess-methane dry reforming conditions.