Realizing the Commercial Potential of Hierarchical Zeolites: New Opportunities in Catalytic Cracking

Many approaches to mesoporous zeolites have been reported. The preparation of mesoporous zeolite Y, as the most widely used zeolite in catalysis, its properties, and its application in fluid catalytic cracking (FCC) and hydrocracking are reviewed. Finally, the scale-up and use of mesostrutured zeolite Y on an industrial scale are described, as the first commercial application of hierarchical zeolites.

Notes on Philippine Mallophaga, I: Species from Ciconiiformes, Anseriformes, Falconiformes, Galliformes, Gruiformes and Charudriiformes [by] K. C. Emerson and Ronald A. Ward.

v.42:no.4(1958)

Letter from Artemas Ward to Benjamin Stone, 1787 July 18

Artemas Ward wrote this letter to Benjamin Stone on July 18, 1787, expressing his concern about the expense of his son, Henry Dana Ward's, imminent studies at Harvard. Ward complains to Stone about his own debts and the failure of the government to honor their financial obligations to him, and he also expresses hope that the President of Harvard will allow his son to spend part of his time "keeping a school" during his freshman and sophomore years, thus earning an income sufficient to pay for his studies. Ward also suggests that it might be preferable that his son board with a respectable family, rather than live at the College.

Ward, George, autographed letter signed to John Winthrop; Brainford, 1 side (3 pages), 1652 June 15

Correspondence seeking advice on treatment of a urinary condition.

Ward, John, 1606-1693, autographed letter signed to John Winthrop; Cotohit [sic], Mass., 1 side (2 pages), 1652 May 29

Correspondence requesting advice for treating occasional fits of pain and cold Ward was suffering.

Rubbing of the gravestone of Harvard librarian Nathaniel Ward made by David S. Ferriero, October 15, 1972

Large rubbing of the gravestone of Nathaniel Ward, librarian of Harvard college for one week in 1768. The rubbing was made by David S. Ferriero, and is signed and dated October 15, 1972 in the lower right corner.

Core-shell nanocomposites prepared by hierarchical co-assembly: the role of the carbon shell in catalytic wet peroxide oxidation processes

The diffraction pattern of Fe3O4 (not shown) confirmed the presence of only one phase, corresponding to magnetite with a lattice parameter a = 8.357 Å and a crystallite size of 16.6 ± 0.2 nm. The diffraction pattern of MGNC (not shown) confirmed the presence of a graphitic phase, in addition to the metal phase, suggesting that Fe3O4 nanoparticles were successfully encapsulated within a graphitic structure during the synthesis of MGNC. The core-shell structure of MGNC is unequivocally demonstrated in the TEM micrograph shown in Fig. 1b. Characterization of the MGNC textural and surface chemical properties revealed: (i) stability up to 400 oC under oxidizing atmosphere; (ii) 27.3 wt.% of ashes (corresponding to the mass fraction of Fe3O4); (iii) a micro-mesoporous structure with a fairly well developed specific surface area (SBET = 330 m2 g-1); and (iv) neutral character (pHPZC = 7.1). In addition, the magnetic nature of MGNC (Fig. 2) is an additional advantage for possible implementation of in situ magnetic separation systems for catalyst recovery.