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ACCESSION NUMBER:    94:195483       SCISEARCH
THE GENUINE ARTICLE: NA234
TITLE:               THE SYNTHESIS OF COLLOIDAL ZEOLITE HYDROXYSODALITE
                     SOLS BY HOMOGENEOUS NUCLEATION
AUTHOR:              SCHOEMAN B J (Reprint); STERTE J; OTTERSTEDT J E
CORPORATE SOURCE:    CHALMERS UNIV TECHNOL, DEPT ENGN CHEM, S-41296
                     GOTHENBURG, SWEDEN (Reprint)
COUNTRY OF AUTHOR:   SWEDEN
SOURCE:              ZEOLITES,(MAR 1994) Vol.14, No.3, pp.208-216.
ISSN:                0144-2449.
DOCUMENT TYPE        Article; Journal
FILE SEGMENT:        PHYS
LANGUAGE:            ENGLISH
REFERENCE COUNT:     17
ABSTRACT:
Colloidal suspensions of discrete particles of microcrystalline
hydroxysodalite have been synthesized from clear homogeneous solutions
wherein the average particle size determined by dynamic light scattering
is 37 nm with a narrow particle-size distribution. Particle-size analysis
performed with various methods yield results that are in agreement. The
growth-limiting nutrient has been identified as alumina. As a result, the
midsynthesis addition of alumina results in further particle growth to 48
nm with the corresponding increase in zeolite yield. Hence, the fine
control of particle size and thereby zeolite yield without the formation
of a secondary particle population is shown to be possible. Direct
measurements of zeolite yield and particle size allow for a detailed
evaluation of the events that occur during crystallization.


CATEGORY:            CHEMISTRY, PHYSICAL

SUPPLEMENTARY TERM:  SYNTHESIS; HOMOGENEOUS; HYDROXYSODALITE; DYNAMIC
                     LIGHT SCATTERING; COLLOIDAL; MONODISPERSE
SUPPL. TERM PLUS:    TETRAMETHYLAMMONIUM
RESEARCH FRONT:      92-0925 001; SUPPORTED RHODIUM CATALYSTS;
                     CARBON-MONOXIDE HYDROGENATION; REACTIVITY OF CO;
                     X-RAY ABSORPTION-SPECTROSCOPY
                     92-2442 001; MIE SCATTERING; NONSPHERICAL PARTICLES;
                     CHIRAL SPHERES

REFERENCE(S):

   Referenced Author   |Year | VOL | PG   | Referenced Work

	  (RAU)        |(RPY)|(RVL)|(RPG)|     (RWK)

=======================+=====+=====+======+====================

BAERLOCHER C           |1969 |52   |1853  |HELV CHIM ACTA
BARRER R M             |1982 |     |160   |HYDROTHERMAL CHEM ZE
BARRER R M             |1961 |     |971   |J CHEM SOC
BRECK D W              |1984 |     |      |ZEOLITE MOL SIEVES
CUNDY C S              |1990 |100  |189   |J CRYST GROWTH
FREUND E F             |1976 |34   |11    |J CRYST GROWTH
GREGG S J              |1982 |     |4     |ADSORPTION SURFACE A
HOPKINS P D            |1989 |398  |152   |ACS SYM SER
HUNTER R J             |1987 |1    |127   |F COLLOID SCI
JARMAN R H             |1983 |     |512   |J CHEM SOC CHEM COMM
KEIJSPER J             |1989 |49   |237   |ZEOLITES FACTS FIGUR
KERKER M               |1969 |     |      |SCATTERING LIGHT OTH
MEDLIN J H             |1969 |8    |25    |ATOM ABSOPT NEWSL
SCHOEMAN B J           |1993 |     |994   |J CHEM SOC CHEM COMM
SCHOEMAN B J           |1994 |14   |110   |ZEOLITES
WEINER B B             |1987 |332  |48    |ACS SYM SER


STN Patent No.  |Year |Ref. Inventor/Assignee  |Type |Ref. Patent No.
   (RPN)        |(RPY)|         (RAU)          |     |     (RPN)

================+=====+========================+=====+===============

SE92025188      |1992 |OTTERSTEDT J E          |APPL |SW 92025188