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The objective of this study was to determine the heat capacity and heat of dissociation of methane hydrates. A technique has been devised which circumvents the two major problems encountered in measuring gas hydrate heat capacity: the need to impose a mechanical pressure during the measurement and the need to have an absolutely pure hydrate sample. The technique was shown to be successful utilizing high-pressure, constant-volume cells in a differential scanning calorimeter.

Ind. Eng. Chem. Process Des. Dev. 1985, 24, 882-885 effect is not clear in the case of the Mo + Co impregnation sequence since stepwise impregnation of Mo is not included in this sequence.2. HDN activities of the Ni-Mo catalysts remained about the same by changing the impregnation technique.3. HDN and HYC activities of the Co-Mo catalysts were sensitive to the impregnation technique. This was probably because of the fact that the batchwise Mo irhpregnation produced a more surface Co-Mo interaction phase. HYD activities were insensitive to the impregnation technique. 4.A Co-Mo catalyst prepared by the Mo + Co (first Mo and then Co) impregnation sequence seems to be advantageous over the Ni-Mo catalysts for coal liquids upgrading since it removes nitrogen and cracks the heavy hydrocarbons with minimum hydrogen consumption.5. The effect of water addition on catalytic activity appears to be sensitive to the impregnation technique and the source of the catalyst and catalyst support.6. HYC activities of the Co-Mo catalysts are higher than the Ni-Mo catalysts. Literature CitedBerg, L.; McCandless, F. P.; phln, T.; Tsao, I. Energy Pfog. 1983, 3. Brlnkman, D. W.; Bowden, J. N. Fuel 1982, 61, 1141-1148. Canosa Rodrigo, B.; Jezbrowskl, H.; Knozinger, H.; Wang, X. Sh.; Taglauer, Cheadle, G. D.; Welch, C. J.; Lappln, T. A,; Dana, P. M. 011 Qls J . 1968, 64 Chung, K. J.; Massoth, F. P. J . Catal. 19808, 6 4 , 320-331. 248-252. E. Bun. soc. m. w. w i , so, 1339-1345. (29), 76-82. COMMUNICATIONS C h W , K. J.; MaSSOth, F. P. J . &tal. 198Ob, 64. 332-345. DecklerckOrImme, R. I.; CaneEwn, P.: Freldman. R. M.; Frlplat, J. J. J . Gowdiaan. F. Thesis, Twente Unhrersity of Technobgy. Enchede. The Neder-Jankowskl, A.; Doehler, W.; Graer, U. Fuel 1062, 67, 1032-1038. K h , N. K. Ph.D. Thesis, Montana State Unlverbhy, Bozeman, 1982. Knozhger. H.; Jezbrowskl, H.; Taglauer, E. Proc. Int. C w . Cetal.. 7th Massoth, F. P.; Cheng, K. S. Proc. Int. Congr. Catel., 7th 1981, 629-642. Okamdo, Y.; Tomloha, H.; Imanaka, T.; Teranlshl, S. Roc. Int. C o w . Cahln, T. Master's Theats, Montana State Unhrerstty, Bozeman, 1982. M, T. Ph.D. Mssertetkn, Montana State UniversHy, Bozeman, 1983. whin, T.: Berg, L.; Mccendless, F. P. Ind. Eng. Chem. Pfocms Des. Dsv. SatterReld, C. N.; Carter, D. L. Ind. Eng. Chem. h e s s Des. Dev. 1981, Schwagar. I.; Stramkeo, D. N. DOEIET/12103-T4, Final Report, Fwbol Corp., Segawa, K.; Hall, W. K. J . Cetal. 1982, 76, 133-143. Shrasubramanian, R.; Crynes, B. L. Ind. Eng. Chem. M . Res. Dev. 1979, Valym, J.; Schnelder, R. L.; Hall, W. K. J . Cstal. 1984, 85, 277-280. Walks, P. C. Fual1982, 61, 1051-1057. Wlvel, C.; Candle, R.; CleUSem, 8. S.; Morup, S.; Topsoe, H. J . Catal. 1081.The effect of certain artificial and natural sediments on the heat capacity and heat of dissoclatlon of the hydrates of tetrahydrofuran (THF) has been investigated. The sediments used in this study were glass beads (1.0-, 0.1-, and 0.04-mm diameter), Ottawa sand, and ocean-bottom sediment in which natural gas hydrates once existed. These calorime...

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