The present study was undertaken to determine if dense carbon could be grown efficiently at relatively low temperatures on smooth silica surfaces via methane pyrolysis in a continuous flow reactor. Process gases ranging from a 50% methanelhydrogen mixture to 100% methane were passed through either empty or fused-quartz-wool-packed quartz tube reactors isothermally maintained at 1100" to 1250°C. The results indicated that relatively dense carbon (1.6 to 2.2 g/cm3) could be produced within this temperature range by using a low flow rate of pure methane passing through a fused-quartz-wool-packed reactor maintained at 1200 "C. These results constitute new findings, since previous studies of the formation of carbon from methane indicated that much higher temperatures (1800" to 2500°C) were required to form dense carbon without metal catalysis. The results also support the condensation theory of hydrocarbon pyrolysis to carbon.For air revitalization in manned spacecraft missions over a long duration, oxygen for breathing must be recovered from metabolic carbon dioxide. Carbon dioxide can be treated with hydrogen to form methane and water using the Sabatier process. '** This water can be electrolyzed into hydrogen and oxygen for' and the methane can be decomposed thermally (pyrolyzed) into hydrogen and solid Hydrogen from water electrolysis and carbon formation can then be recycled. This process is shown in Fig. 1.To reduce its storage volume, the density of the carbon 'Member, the American Ceramic Society.
Background: Prions, the infectious agents that cause transmissible spongiform encephalopathies (TSEs), are relatively resistant to destruction by physical, enzymatic, and chemical treatments. Hydrolysis in boiling saturated calcium hydroxide (limewater) utilizes inexpensive chemicals to digest protein components of offal. The purpose of this work was to determine if incubating brain material from scrapie-infected sheep in near-boiling saturated calcium hydroxide solution (Ca(OH) 2 ) would abolish immunoreactivity of the infectious prion (PrP Sc ) as determined by western blot.
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