Article
Nanoscience & Nanotechnology
Guoru Li, Yuhang Tan, Zhiping Lei, Fengxiang Yin, Xiaobo He
Summary: Ni nanocatalysts based on high surface area carborundum were successfully synthesized for the decomposition of ammonia to CO (x)-free hydrogen using a wet impregnation approach. The catalysts were characterized by various methods and showed that the Ni/SiC catalyst had high activity and stability. The study provides a promising avenue for the development of cost-effective and high-performance catalysts for hydrogen production via NH3 decomposition.
ACS APPLIED NANO MATERIALS
(2023)
Article
Engineering, Environmental
Long Li, Lifang Zhao, Zhiqiang Ma, Chaojie Li, Jihai Duan, Weiwen Wang
Summary: The partial doping of Zr in CeO2 framework enhances the surface area and oxygen vacancy of the catalyst, promoting NH3 oxidation and dehydrogenation reactions. The CNCZ-55 catalyst shows excellent activity, with conversion rates of 97% for ammonia and 100% for oxygen, and a notable hydrogen production efficiency of 63%.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Energy & Fuels
Arnoldus Lambertus Dipu
Summary: Hydrogen has the potential to replace fossil fuels in various environments, with Ni-based catalysts showing high activity for catalytic methane decomposition. Consideration should be given to reactor design and regeneration techniques for industrial applications of CMD.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Physical
Tolga Kocer, F. Eylul Sarac Oztuna, Samira Fatma Kurtoglu, Ugur Unal, Alper Uzun
Summary: Ruthenium dispersed on graphene aerogel achieves high performance in COx-free hydrogen production from ammonia. The addition of potassium greatly enhances the ammonia conversion rate and hydrogen generation rate under stable conditions.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Energy & Fuels
Fu Zhiqiang, Wang Ziqing, Li Dexing, Lin Jianxin, Yu Lingzhi, Wu Qin, Wei Zhong
Summary: The study found that the formation of alkali metal silicates can increase the number and strength of basic sites on the catalyst material, thus improving the efficiency of NH3 conversion.
Article
Chemistry, Physical
Thien An Le, Youngmin Kim, Hyun Woo Kim, Su-Un Lee, Jeong-Rang Kim, Tae-Wan Kim, You-Jin Lee, Ho-Jeong Chae
Summary: In this study, Ru-doped LaxCe1-xOy composites were investigated for NH3 decomposition to generate COx-free H-2. The catalyst Ru/La0.33Ce0.67 showed superior catalytic activity and stability, highlighting the importance of Ru size and interaction with the composite for enhanced NH3 decomposition.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Multidisciplinary
M. Pinzon, A. Romero, A. de Lucas Consuegra, A. R. de la Osa, P. Sanchez
Summary: The study investigates the impact of catalyst preparation conditions on hydrogen production from ammonia decomposition. It is found that Ru dispersion and metallic particle size significantly affect catalytic activity. Calcination in a nitrogen atmosphere enhances catalytic activity, and lower reduction temperatures lead to more active ruthenium particles. Maximum intrinsic activity is achieved with Ru particle size around 5 nm under specific conditions.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Chemistry, Physical
Ze-Wei Wu, Jing Xiong, Cun-Wen Wang, Yuan-Hang Qin
Summary: In this study, high-loading Ni catalyst on SBA-15 is investigated to overcome the low intrinsic activity issue of Ni in NH3 decomposition. The results show that Ni/SBA-15-80 with a loading close to 40 wt% exhibits superior NH3 decomposition performance and excellent catalytic stability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Zhijun Wang, Ge He, Huazhou Zhang, Che Liao, Chi Yang, Feng Zhao, Guangjiu Lei, Guoyao Zheng, Xinchun Mao, Kun Zhang
Summary: The study investigates the enhancement of catalytic ammonia decomposition using non-thermal dielectric barrier discharge (DBD) plasma over supported Ru catalysts. It was found that the plasma-catalytic reactivity of Ru/La2O3 was superior to other catalysts due to the physicochemical properties of the catalyst and the plasma discharge behaviors. The combination of plasma and Ru catalyst significantly improved ammonia conversion at low temperatures.
Article
Chemistry, Physical
Kiya Ogasawara, Takuya Nakao, Kazuhisa Kishida, Tian-Nan Ye, Yangfan Lu, Hitoshi Abe, Yasuhiro Niwa, Masato Sasase, Masaaki Kitano, Hideo Hosono
Summary: Ni-supported CaNH acts as a highly efficient catalyst for ammonia decomposition through an NH2- vacancy-mediated Mars-van Krevelen mechanism, exhibiting much greater activity than other Ni-based catalysts with a 100 degrees C lower operating temperature.
Article
Multidisciplinary Sciences
Osama Atef Al-attar, Seetharamulu Podila, Abdulrahim A. Al-Zahrani
Summary: The decomposition of ammonia using cobalt catalysts supported on perovskite-type XCeO3 (X: Mg, Ca, Sr, Ba) oxide was studied. It was found that the 5Co-BaCeO catalyst exhibited the highest activity among the others, and the interaction between BaCeO3 and Co contributed to its improved catalytic activity.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Biochemistry & Molecular Biology
Haihua He, Chonglai Chen, Chaoqun Bian, Junhua Ren, Jiajia Liu, Wei Huang
Summary: Ammonia decomposition is a promising method for high-purity hydrogen production, but it typically requires precious metals as catalysts. This study proposes using Ni/GdxCe1-xO2-delta catalysts to improve performance by adjusting support properties and investigates the underlying mechanism. It is found that Ni/Ce0.8Gd0.2O2-delta exhibits high catalytic activity and stability due to a high concentration of oxygen vacancies, highly dispersed Ni, and abundant strong basic sites.
Article
Chemistry, Physical
Chen Zhou, Kai Wu, Haowei Huang, Chen-Feng Cao, Yu Luo, Chong-Qi Chen, Li Lin, Chaktong Au, Lilong Jiang
Summary: In this study, a hybrid Ni catalyst supported by CeO2 and BN was developed for efficient NH3-to-H2 conversion. The addition of BN improved the spatial distribution of Ni nanoparticles, enriched oxygen vacancies and increased Ce3+ concentration, leading to enhanced electron transfer from the support to Ni. The resulting electron-rich Ni species promoted NH3 activation and N2 desorption, ultimately boosting NH3 decomposition efficiency.
Article
Energy & Fuels
Tolga Kocer, F. Eylul Sarac-Oztuna, Samira F. Kurtoglu-Oztulum, Ugur Unal, Alper Uzun
Summary: Graphene aerogel is utilized to disperse nickel nanoparticles for high catalytic activity in COx-free hydrogen production from ammonia. Using Ni(acac)(2) as the metal precursor in an impregnation solution with a pH of 10.2, the catalyst shows the best dispersion and catalytic performance.
Article
Chemistry, Multidisciplinary
Seetharamulu Podila, Hafedh Driss, Arshid M. Ali, Abdulrahim A. Al-Zahrani, Muhammad A. Daous
Summary: In this study, LaNiO3 and LaCoO3 catalysts were prepared using citric acid as the organic fuel through combustion synthesis method and tested for NH3 decomposition. Partial substitution of La by Ce in both catalysts showed a remarkable effect on catalytic performance, especially at lower temperatures. The La0.5Ce0.5NiO3 catalyst exhibited the highest activity among all prepared samples and demonstrated excellent stable catalytic performance during 50 hours of study at 550 degrees C.
ARABIAN JOURNAL OF CHEMISTRY
(2022)