Article
Chemistry, Multidisciplinary
Longfei Zhu, Sen Ye, Jiazheng Zhu, Chengjie Duan, Kun Li, Guangke He, Xiang Liu
Summary: The study successfully prepared Ni-TA/HAP catalyst, exhibiting excellent activity and selectivity for efficient hydrogenation of phenolic compounds to cyclohexanols and controlled partial hydrogenation of N-heteroarenes. The addition of tartaric acid promoted better dispersion of Ni species and inhibited aggregation, with optimal TA dosage and low Ni loading constructing a favorable microstructure for the well-dispersed Ni nanoparticles as the catalytic center, enhancing hydrogenation through small-sized Ni nanoparticles with high H-2 activation ability and HAP with base and acid sites for phenol absorption.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Review
Engineering, Chemical
Nguyen Van Duc Long, Mohamad Al-Bared, Liangliang Lin, Kenneth Davey, Nam N. Tran, Nima Pourali, Kostya Ken Ostrikov, Evgeny Rebrov, Volker Hessel
Summary: Plasma-assisted ammonia synthesis is a cross-disciplinary research field that is not well understood by researchers outside their own disciplines. This study aims to address this problem by critically reviewing plasma-related literature and focusing on plasma-enabled NH3 synthesis as a showcase for process chemistry. Understanding the mechanisms of plasma-driven NH3 synthesis is crucial for improving plasma reaction engineering.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
David N. Stephens, Robert K. Szilagyi, Paige N. Roehling, Navamoney Arulsamy, Michael T. Mock
Summary: We have reported a nickel complex that can catalyze the oxidation of ammonia to dinitrogen under ambient conditions. By using aryloxyl or N-oxyl radicals as H atom acceptors, the N-H bonds of coordinated NH3 ligands can be cleaved to generate N-2 molecules. Isotopic nitrogen studies have identified a bridging Ni-hydrazine product, supported by computational models, indicating a bimetallic homocoupling mechanism for N-N bond formation.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Applied
Hoang M. Nguyen, Fnu Gorky, Shelby Guthrie, Maria L. Carreon
Summary: Ammonia synthesis from N2 wet with seawater vapor using non-thermal plasma over spherical SiO2 and M/SiO2 catalysts is a promising replacement for the centralized Haber-Bosch process. The presence of a catalyst is essential for ammonia production, with the Co/SiO2 catalyst showing the highest synthesis rate and energy yield at a low input power. The extraction of H atoms from H2O molecules plays a crucial role in ammonia synthesis from seawater vapor. This work provides a novel platform for the optimization of sustainable ammonia production from renewable sources.
Article
Chemistry, Applied
Christina Wildfire, Victor Abdelsayed, Dushyant Shekhawat, Robert A. Dagle, Stephen D. Davidson, Jianli Hu
Summary: In this study, microwave synthesis of ammonia over Ru/MgO catalysts was conducted at 320℃ under ambient pressure with different Ru loading levels. Higher Ru loading showed better dispersion, leading to decreased sintering and enhanced activity and stability. The microwave reactor also offered faster catalyst recovery compared to traditional thermal convectional Haber Bosch (HB) technology.
Article
Materials Science, Multidisciplinary
Tianqi Zhang, Renwu Zhou, Shuai Zhang, Rusen Zhou, Jia Ding, Fengwang Li, Jungmi Hong, Liguang Dou, Tao Shao, Anthony B. Murphy, Kostya (Ken) Ostrikov, Patrick J. Cullen
Summary: This study demonstrates successful ammonia synthesis from nitrogen and water using nonthermal plasma catalysis. The findings suggest that plasma-induced vibrational excitation and matched catalysts in the nonthermal plasma discharge reactor contribute to molecular dissociation. The results show that the ruthenium catalyst supported on magnesium oxide exhibits superior performance in ammonia production. This research highlights the potential of nonthermal plasma catalysis for sustainable ammonia production.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Engineering, Environmental
Yuxin Wang, Christina Wildfire, Tuhin S. Khan, Dushyant Shekhawat, Jianli Hu, Pedram Tavadze, Rosalynn Quinones-Fernandez, Sara Moreno
Summary: This study demonstrates the high activity of Cs-promoted Ru/CeO2 catalyst for ammonia synthesis at 533K and ambient pressure, achieved through optimized electronic and geometric structures. The strong interaction between Ru and CeO2 leads to the formation of highly dispersed Ru particles favorable for ammonia synthesis. CeO2's higher electron donating ability and Cs promoter's lower electronegativity result in increased electron density on Ru, reducing the N dissociation barrier.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Koki Tsunematsu, Keita Shinzato, Hiroyuki Gi, Kentaro Tagawa, Masakuni Yamaguchi, Hitoshi Saima, Hiroki Miyaoka, Takayuki Ichikawa
Summary: In this study, the catalytic performance of sodium alloys for ammonia production was systematically investigated. The results showed that ammonia could be synthesized at lower temperatures using sodium alloy catalysts under atmospheric pressure, with stable catalytic activity. The thermal stability and metallic feature of sodium atoms in the alloys were found to be related to the ammonia synthesis temperature and catalytic performance.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Yue Zhao, Kelin Li, Jing Du, Chao-Qin Chen, She Chen, Peng Yang
Summary: Template method not only improves the synthetic efficiency of polyoxopalladates (POPs), but also plays many other roles in polyoxopalladate chemistry, such as establishing novel metal-oxo scaffolds. A binary system composed of nonmetallic {As/SiO4} and metallic {VO4/5} heterogroups successfully creates two POPs with unprecedented seesaw- and spindle-like prototypes. The self-aggregation of heterogroups helps break the highly symmetrical Pd-II-oxo matrix and force the unconventional arrangement of addenda. Additionally, the as-made POPs can be immobilized on mesoporous SBA-15 as precatalysts for ammonia synthesis. The outer cover of heterogroups in the POP precursors contributes to the ultrafine size and uniform distribution of derived Pd-0 nanoparticles (PdNPs).
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Mikhail Gromov, Nefeli Kamarinopoulou, Nathalie De Geyter, Rino Morent, Rony Snyders, Dionisios Vlachos, Panagiotis Dimitrakellis, Anton Nikiforov
Summary: Electrification of the nitrogen fixation industry via plasma technology using renewable energy sources and water as the source of energy and hydrogen shows promising prospects. However, the effect of water on plasma-assisted nitrogen fixation remains unclear. In this study, the efficiency of plasma-assisted nitrogen fixation was investigated using two plasma systems. The presence of water in the reactive zone decreased the energy efficiency of nitrogen fixation by approximately 20%.
Article
Chemistry, Physical
Yang Liu, Jiawang Ma, Shenglong Huang, Shuyu Niu, Shuyan Gao
Summary: This study explores the conversion of nitrogen to ammonia through plasma oxidation of air to produce nitrate, which is then reduced to ammonia using highly dispersed Cu-Fe nanoalloy catalysts. The optimized catalyst exhibits high ammonia yield rate and Faraday efficiency. The findings provide a new pathway for ammonia synthesis and offer insights into the design of high-performance NRA catalysts.
Article
Chemistry, Physical
Thitiporn Suttikul, Sasikarn Nuchdang, Dussadee Rattanaphra, Thongchai Photsathain, Chantaraporn Phalakornkule
Summary: This study investigated the dry reforming of CH4 using AgNi/Al2O3 and SnNi/Al2O3 catalysts in a parallel plate dielectric barrier discharge (DBD) reactor. The performance of the DBD reactor was significantly enhanced when using AgNi/Al2O3 and SnNi/Al2O3 due to their high electrical conductivity and anti-coke performances. Both catalysts achieved high conversion rates and selectivities with reduced coke formation. In addition, Sn enhanced the energy efficiency of the reaction.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Review
Chemistry, Multidisciplinary
Jiayu Feng, Xin Sun, Zhao Li, Xingguang Hao, Maohong Fan, Ping Ning, Kai Li
Summary: This paper reviews the significant progress in plasma-assisted reforming of methane (PARM) from the perspectives of reactor development, thermal and nonthermal PARM routes, and catalysis. The factors affecting the conversion of reactants and the selectivity of products are studied. The findings and insights from this work should benefit the further development of reactors, high-performance catalysts, and PARM routes.
Article
Energy & Fuels
Eugenio Meloni, Liberato Cafiero, Marco Martino, Vincenzo Palma
Summary: This study investigates the production of NTP-assisted catalytic ammonia at milder temperatures and ambient pressure. Experimental results show that the 10Ni/zeolite 13X sample exhibits the best catalytic activity (about 4 mmol h(-1) NH3 production) with the lowest energy consumption, highlighting the feasibility of this innovative technology in this field.
Article
Chemistry, Multidisciplinary
Balaji Mohan, Kyung Hee Oh, Ji Chan Park, Mohammad Yusuf, Kang Hyun Park, Buhyun Youn
Summary: CuO nanoparticles with a clean surface supported on carbon nanofibers were prepared by solid-state grinding and aging followed by thermal treatment. These CuO/CNF catalysts showed excellent catalytic activity in transforming alkynes into alkenyl boronates with high regioselectivity under mild conditions, and they were also recyclable.