R Grace Co.-Conn

Grace Davison Division and Research Division, W.R. Grace Co.-Conn. 

W. R. GRACE CO.-CONN. DE PERE, Wl 10,000-99,999 Produce Import For on-site use/processing As a by-product As a product component... 

The authors are grateful to M. P. Shatlock for the solid state NMR spectra, B. J. Rees for the ESCA work and to the Davison Chemical Division of W. R. Grace Co.-Conn. for permission to publish this work. 

The combined solutions containing the enzyme from the cell separation step (approximately 160 liters) were then concentrated using a 40 square foot, 10,000 MWCO regenerated cellulose S40Y10 Diaflo spiral membrane (Amicon Division of W. R. Grace Co.- Conn., Danvers, MA). A roughly ten fold concentration of the enzyme was achieved in this step. Further concentration and diafiltration of the protein product solution were carried out at the lab scale. 

C. J. Pereira would like to acknowledge useful discussions with Eh. L. L. Hegedus during the preparation of an earlier manuscript. The authors would like to thank Dr. R. H. Harding, Dr. J. E. Kubsh, M. Uberoi and Mr. K. P. Zak all of W. R. Grace Co.-Conn. for their helpful comments. 

Titania-supported vanadia catalysts have been widely used in the selective catalytic reduction (SCR) of nitric oxide by ammonia (1, 2). In an attempt to improve the catalytic performance, many researchers in recent years have used different preparation methods to examine the structure-activity relationship in this system. For example, Ozkan et al (3) used different temperature-programmed methods to obtain vanadia particles exposing different crystal planes to study the effect of crystal morphology. Nickl et al (4) deposited vanadia on titania by the vapor deposition of vanadyl alkoxide instead of the conventional impregnation technique. Other workers have focused on the synthesis of titania by alternative methods in attempts to increase the surface area or improve its porosity. Ciambelli et al (5) used laser-activated pyrolysis to produce non-porous titania powders in the anatase phase with high specific surface area and uniform particle size. Solar et al have stabilized titania by depositing it onto silica (6). In fact, the new SCR catalyst developed by W. R. Grace Co.-Conn., SYNOX , is based on a titania/silica support (7). 

J.A. Lewis, G. Kirby, J.H.-W. Cheung, and A.A. Jeknavorian, Controlled dispersion of colloidal suspension by comb polymers, US Patent 7 053125, assigned to The Board of Trustees of the University of Illinois (Urbana, IL) W.R. Grace Co.-Conn. (Columbia, MD), May 30, 2006. 

Research and Development Fellow, Grace Construction Products, W. R. Grace CO.-COnn., Cambridge, MA 02140. 

W.R. GRACE CO.-CONN. HAMPSHIRE HAMPOSYL Surfactants HAMPOSYL Salts ... 

R. D. Moffitt, Extruding vinylidene chloride copolymer flexible packaging film, US Patent 5147 594, assigned to W. R. Grace Co.-Conn. (Duncan, SC), September 15,1992. 

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