Molybdenum tellurium

Lee DC, Halliday AN (1995) Precise determinations of the isotopic compositions and atomic weights of molybdenum, tellurium, tin and tungsten using ICP magnetic-sector multiple collector mass-spectrometry. Int J Mass Spectr Ion Proc 146 35-46... 

No tellurium derivatives of M3E7X6-type compounds had been described until Fedin et al. reported the synthesis of Mo3Te10I10 from the reaction of molybdenum, tellurium, and iodine at 398°C for 48 hr in a sealed tube (119). The structure (Fig. 30) is composed of [Mo3(/t3-Te)(/x2-... 

In the 1960s, a number of binary oxides, including molybdenum, tellurium, and antimony, were found to be active for the reactions and some of them were actually used in commercial reactors. Typical commercial catalysts are Fe-Sb-O by Nitto Chemical Ind. Co. (62 -64) and U-Sb-O by SOHIO (65-67), and the former is still industrially used for the ammoxidation of propylene after repeated improvements. Several investigations were reported for the iron-antimony (68-72) and antimony-uranium oxide catalysts (73-75), but more investigations were directed at the bismuth molybdate catalysts. The accumulated investigations for these simple binary oxide catalysts are summarized in the preceding reviews (5-8). 

The rates of uptake of molybdenum, tellurium, and rubidium oxide vapors by substrates of calcium ferrite and a clay loam have been measured in air over a temperature range of 900° to 1500°C. and a partial pressure range of about 10r7 to 10 atm. The measured rates of uptake of molybdenum and tellurium oxide vapors by molten calcium ferrite and of rubidium oxide vapor by both molten clay loam and calcium ferrite were controlled by the rates of diffusion of the oxide vapors through the air. The measured rates of uptake of molybdenum and tellurium oxide vapors by molten clay loam were controlled by a combination of a slow surface reaction and slow diffusion of the condensate into the substrate. 

This paper presents the more important data and conclusions from three reports which describe the uptake behavior of the vaporized oxides of molybdenum, tellurium, and rubidium by molten and solid substrates at high temperatures (I, 2, 3). These oxides were used as the vapor species because of their relatively high volatility and because of their importance as radioactive constituents, or the precursors of important constituents, of radioactive fallout particles. 

Figures 8, 10, and 12 show the initial rates (at t = 0) of uptake of the molybdenum, tellurium, and rubidium oxide vapors by samples of...

The complex solid state relations of the cerium-molybdenum- tellurium oxide system were studied to determine the boundaries of single phase regions and phase distributions of a typical multicomponent ammoxidation catalyst. Between 400 and 600 C in air the (Ce,Mo,Te)0 system contains the following phases ... 

The structure of a highly active cerium-molybdenum-tellurium acrylonitrile catalyst(l ) has previously been described in terms of binary (Ce,Mo)0 and ternary (Ce,Mo,Te)0 phases( ). It was concluded that none of the constituent oxides (CeO, ... 

BART ET AL. Cerium-Molybdenum-Tellurium Oxide System... 

In one instance, a related tellurium complex has been reported. Reaction of KS2CN(CH2CH20H)2 with a mixture of the elements, molybdenum, tellurium, and iodine at high temperature leads to the isolation of [Mo3(p -Te)(p-Te2)3 S2CN(CH2CH20H)2 3]I (1005). 

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