منابع مشابه
High-Temperature Release of SO2 from Calcined Cement Raw Materials
During combustion of alternative fuels in the material inlet end of cement rotary kilns, local reducing conditions may occur and cause reductive decomposition of sulfates from calcined cement raw materials. Decomposition of sulfates is problematic because it increases the gas-phase SO2 concentration, whichmay cause deposit formation in the kiln system. In this study, the release of sulfur from ...
متن کاملThe Catalytic Low Temperature Oxydehydrogenation of Methane. Temperature Dependence, Carbon Balance and Effects of Catalyst Composition
In an earlier publication [1] it has been claimed that oxidative coupling of methane to higher hydrocarbons had been obtained with close to 100% selectivity at 600~ and atmospheric pressure in the presence of steam over a CaNiK oxide catalyst. These results have been confirmed in longer runs. Artifacts, such as carbonate formation on the catalyst, have been excluded. The reaction is slightly ex...
متن کاملThe effects of atmosphere and calcined temperature on photocatalytic activity of TiO2 nanofibers prepared by electrospinning
TiO2-based nanofibers were synthesized using a sol-gel method and electrospinning technique. The as-spun composite fibers were heat-treated at different temperatures (500°C, 550°C, 600°C, and 650°C) and atmospheres (ammonia and nitrogen) for 4 h. The fibers had diameters of 50 to 200 nm and mainly featured anatase and rutile phases. The anatase phase decreased and the rutile phase increased wit...
متن کاملA Temperature Overshoot on a Catalyst Pellet
An unexpected temperature overshoot was found for a Pd on alumina catalyst pellet in its course towards a new steady state, after a change in concentration of one of the reactants. The reaction mixture consisted of ethylene, hydrogen and nitrogen as inert. A speculative model is introduced, which can explain these overshoots by a slow adsorption of one of the reactants on the active sites of th...
متن کاملReducing Them Down To Charge Them Up: Low Temperature Catalyst Activation
The largest industrial application of olefin metathesis today is the synthesis of propylene from ethylene and butenes employing WO3 on SiO2, a relatively long-lived and regenerable catalyst that operates at 350–400 °C. It is widely proposed that high temperatures are required because the percentage of metal sites actually involved in the metathesis reaction is extremely low, or the reaction tha...
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ژورنال
عنوان ژورنال: Journal of the Japan Society of Powder and Powder Metallurgy
سال: 1987
ISSN: 0532-8799,1880-9014
DOI: 10.2497/jjspm.34.151