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CHEMICAL
Elegant way to Carnegie Hall. The most important molybdenum compound by far is molybdenum trioxide (M0O3 ). To get it, you can start with molybdenite and refine the ore yourself. Or you can buy the stuff. But if you're a catalyst connoisseur, you'll forget about the trioxide and order Sylvania's ammonium paramolybdate—(NH4)6Mo 7 0 2 4-x H 2 0. You absorb the para into your substrate, fire the mate rial in air, and—presto—there's your catalytic M0O3 ready for action. Why start with para instead of the trioxide? Because M0O3 isn't exactly soluble. A quarter of an ounce or so will dissolve in a gallon of water if you boil the mixture or let it stand around for a couple of months. Contrast this with paramolybdate. At room tempera ture, an amount of para equivalent to 3.9 pounds of M0O3 will dissolve in just one gallon of water. And then there's the matter of purity. It's no problem at all when you use our ammonium paramolybdate. The chemical is so pure, we sell it as both Commercial and Reagent grades. We sell para with the least amount of water of hydra tion compatible with keeping the stuff completely soluble. The χ in its formula is at least 4. Less water drives para to higher acidities where the hobgoblins of molybdenum chemistry start to tie the molybdate ions into little poly meric bundles. Nowadays we point with pride to this catalytic off spring of ours. Para is used in gasoline refining where it helps boot the sulfur out of crude stock.
FROM
SYLVANIA
The uses of molybdenum catalysts prepared from our para seem endless: desulfurization, polymerization, alkylation, dehydration, hydrogénation, isomerization, cyclization, chlorination, condensation. You could get gray looking through the literature. Oh, yes—that reference to Carnegie Hall. There's a story about a stranger who stops a passerby on the streets of New York and asks, "How do you get to Carnegie Hall?" "Practice, my boy, practice." The most elegant route. Like para—the most elegant route to the trioxide. So you heard the story before! We'll make it up to you by sending you a tech bulletin on ammonium paramolybdate. Sorry—we can't send a sample to everybody, but if you have a good reason, you can have one.
Slowly they fade away. Our Daylight-Excited Phosphors keep right on glowing after you remove them from the light. It takes about 10 minutes for them to dull down, and even after an hour you can still detect their glow. That's extremely good persistence. They can also be excited by ordinary light bulbs, fluorescent lamps and ultraviolet light. The phosphors come in five colors: green, blue, red, yellow-orange and yellow. Mix them into transparent plastics and coating vehicles. Give them a shot of light and watch them shine. K100| 3 Û-
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Thermogravimetric analysis. Cook 1 molecule of para: get 7 molecules of trioxide.
1.0 10 100 TIME AFTER EXCITATION (MINUTES! Persistence of blue phosphor.
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Write for our free folder on Daylight-Excited Phosphors. Samples are available but the supply is limited: first come,firstserved. Were always glad to talk to you about molybdenum, tungsten and phosphor chemistry. GTE Sylvania, Chemical & Metallurgical Division, Towanda, Pa. 18848.
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