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- W1981014103 abstract "The effects of various pretreatments on total area, oxygen chemisorption, and SMo ratio have been studied on unsupported molybdenum sulfide, prepared by in situ decomposition of ammonium tetrathiomolybdate (ATTM) in helium. The initial catalyst contains excess sulfur (SMo = 2.3−2.4), has high surface area, and shows little O2 chemisorption. Temperature-programmed reduction (TPR) in H2 shows two H2S peaks, centered at about 180 and 380 °C. Negligible sintering occurs during removal of sulfur corresponding to the first TPR peak; sintering does occur during the second TPR peak and increases when the sample is maintained in H2 at 450 °C. Specific O2 chemisorption increases with increasing reduction temperature. The properties of the resulting sulfide depend both on the heating schedule during the original decomposition of ATTM and on the sample size. Pretreatment in H2SH2 rather than in H2 results in much less sintering and much lower specific O2 chemisorption." @default.
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- W1981014103 date "1985-10-01" @default.
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- W1981014103 title "Studies of molybdenum sulfide catalysts: Effects of pretreatment on sintering, stoichiometry, and oxygen chemisorption" @default.
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