Journal article
Exploring the limits: A low-pressure, low-temperature Haber–Bosch process
SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA SUNCAT Center for Interface Science and Catalysis SLAC National Accelerator Laboratory Menlo Park CA 94025 USA1
SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Stanford, USA SUNCAT Center for Interface Science and Catalysis Department of Chemical Engineering Stanford University Stanford USA2
The Haber–Bosch process for ammonia synthesis has been suggested to be the most important invention of the 20th century, and called the ‘Bellwether reaction in heterogeneous catalysis’. We examine the catalyst requirements for a new low-pressure, low-temperature synthesis process. We show that the absence of such a process for conventional transition metal catalysts can be understood as a consequence of a scaling relation between the activation energy for N2 dissociation and N adsorption energy found at the surface of these materials.
A better catalyst cannot obey this scaling relation. We define the ideal scaling relation characterizing the most active catalyst possible, and show that it is theoretically possible to have a low pressure, low-temperature Haber–Bosch process. The challenge is to find new classes of catalyst materials with properties approaching the ideal, and we discuss the possibility that transition metal compounds have such properties.
Language: | English |
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Year: | 2014 |
Pages: | 108-112 |
ISSN: | 18734448 and 00092614 |
Types: | Journal article |
DOI: | 10.1016/j.cplett.2014.03.003 |