Screening Tests for Improved Methane Cracking Materials

Evaluation of Alternate Impurity Removal Getters - Year 2

“…This material may still be useable if adequate safeguards are in place for temperature control and gas composition. Previous reports indicated that Ni/k did not perform well for methane cracking in a hydrogen carrier environment [23]. The cracking efficiency of methane over Ni/k is directly related to the dispersion of nickel within the support material, smaller nickel particles show better cracking performance.…”

“…This is likely true for other getter materials as well. Literature indicates that zirconium-based materials have shown a reduction in methane cracking performance by nitride formation when tested with a nitrogen carrier gas [23].…”

“…A series of screening experiments was completed in 2007 in an attempt to find a potential replacement material for ST909. A report was subsequently issued (WSRC-STI-2007-0141) that described results related to the screening tests for improved methane cracking materials [24,25].…”

“…Literature suggests that although many materials, including other SAES getter materials, may have better methane cracking performance than ST909, no other single material was ideal for use in all three carrier gas streams (helium, hydrogen, and nitrogen) tested in previous experiments [23]. However, the main carrier gas in TPS is nitrogen.…”

Study on the Kinetics of Water Decomposition by ZrMnFe Micro Powder

“…The reducing material should work at relative low temperature and the material should have small hydrogen inventory to reduce tritium loss [7]. ZrMnFe alloy (trade mark St909) is the most suitable material to meet above requirements, but its price is as high as $4000-$4500($US)/kg [8]. In our previous study, a new method named as solvent combustion and calcium reduction was used to synthesized ultrafine ZrMnFe alloy powder [9], the cost of alloy can be decreased dramatically by using this method.…”