Noble metal catalyzed hydrogen generation from formic acid in nitrite-containing simulated nuclear waste media

Article Abstract:

Rhodium is an active catalyst for hydrogen generation from formic acid above ~80 degrees C in the presence of nitrite ion, affirming earlier observations. This was indicated by studies which used simulants containing the major nonradioactive components Al, Cd, Fe, Mn, Nd, Ni, Si, Zr, Na, CO3(super 2-), NO3- and NO2- as media to evaluate the stability of formic acid toward hydrogen evolution. Experiments were conducted to examine the effect of nitrite and nitrite ion on the catalytic activities of the noble metals for formic acid decomposition.

Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Rhodium, Precious metal products, Metals, Hydrogen content (Metals)

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Noble metal-catalyzed ammonia generation by formic acid reduction of nitrate in simulated nuclear waste media

Article Abstract:

A simulation of the Hanford Waste Vitrification Process allowed the evaluation of noble-metal catalyzed ammonia generation by formic acid reduction of nitrate. In the rhodium-catalyzed reduction of nitrogen-oxygen compounds to ammonia by formic acid, nitrate was found to be the principal source of ammonia. Heterogenous catalysis, in the form of supported rhodium metal catalyst such as RhCl3, is more active in the process and ammonia production occurs at the expense of hydrogen production.

Engineering Services, ENGINEERING & MANAGEMENT SERVICES, Engineering for Nuclear Waste Systems, Management, Ammonia, Nuclear engineering

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Redox potential monitoring as a method to control unwanted noble metal-catalyzed hydrogen generation from formic acid treatment of simulated nuclear waste media

Article Abstract:

Redox potential monitoring has been found to be a potentially effective way of controling hydrogen generation in formic acid treatment of nuclear waste media. Experiments show that initial phase reactions show a dramatic rise in redox potential but no generation of hydrogen because of the presence of free nitrous acid. Hydrogen generation control has been found be determined by limiting the amount of formic acid.

Methods

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