Tag Archives: Plasma

Microwave Catalysis for Ammonia Synthesis Under Mild Reaction Conditions

Jianli Hu*, Hanjing Tian, Yan Luo, Xinwei Bai, West Virginia University, USA; Dushyant Shekhawat, Christina Wildfire, Victor Abdelsayed, Michael J. Spencer, National Energy Technology Laboratory, USA; Robert A. Dagle, Stephen Davidson, Pacific Northwest National Laboratory, USA; Albert E. Stiegman, Florida State University, USA

15th Annual NH3 Fuel Conference, Pittsburgh, PA, October 31, 2018
NH3 Energy+ Topical Conference at the AIChE Annual Meeting

ABSTRACT

A scalable, cost-effective catalytic process of ammonia synthesis is developed by using microwave excitation under mild reaction conditions. In this research project funded by DOE ARPA-E, our interdisciplinary team of WVU, NETL, PNNL, FSU and two industrial partners have demonstrated that ammonia synthesis can be carried out at 200-300 °C and ambient pressure. This transformational process integrates system elements of electromagnetic sensitive catalysts and microwave reactor design. Taking advantages of state-of-the art non-equilibrium microwave plasma technology, catalytic ammonia synthesis undergoes a new reaction pathway where the barrier for the initial dissociation of the dinitrogen is decoupled from the bonding energy of the intermediates. Continue reading

Ammonia Synthesis Via Radiofrequency Plasma Catalysis

Javishk Shah*, Maria Carreon, University of Tulsa, USA; Weizong Wang, Annemie Bogaerts, University of Antwerp, Belgium

15th Annual NH3 Fuel Conference, Pittsburgh, PA, October 31, 2018
NH3 Energy+ Topical Conference at the AIChE Annual Meeting

ABSTRACT

Introduction:
In 1909, a compound named Ammonia was discovered. Through the 20th century, the immense potential of this chemical was exploited by using in almost every product, from process industry for fertilizer and chemical production to every use in cosmetics, household cleaners and medicines. Recently, fuel cells operating on liquid ammonia as working fluid have been developed on research scale. Despite of using 1-2% of total energy production for the synthesis of this compound, no significant changes have been made to the process since the first Haber-Bosch process plant has been setup.

Plasma catalysis is the use of plasma and catalyst synergism for the synthesis of various compounds. In case of ammonia synthesis, it helps in shifting the rate-limiting step from nitrogen dissociation to NHx formation. The excitation source helps the molecules to reach excited and ionized states which ensures the abundance of radicals for radicals. Radio-Frequency plasma is once such tool for plasma-catalysis. The synthesis has been explored by Matasumoto et al.[1] but no concrete details about the reaction pathway and plasma-catalyst synergism have been reported. Continue reading