title: [Determination of average particle diameter and size distribution of ultra-fine beta zeolite by capillary zone electrophoresis].
abstract: A new method was developed for the determination of average particle diameter and size distribution of ultra-fine beta zeolite by capillary zone electrophoresis (CZE). The dispersion and stabilization conditions of ultra-fine beta zeolite powder in suspensions were investigated by measuring the isoelectric point (IEP) of the powder suspension. Stable dispersion condition of beta zeolite ultrafine particles in aqueous solution was obtained by adding beta zeolite into the buffer (1.25 mmol/L NaHCO3-5 mmol/L Na2CO3, pH 10.82). The calibration equation between migration time and particle size was established to obtain the data of particle diameter by relating the beta zeolite diameters determined by laser particle sizer with the migration time from electropherogram of beta zeolite through the cumulative percentage of particle distribution. The calibration equation between particle size and amount was also established to correct the deviation of the response caused by particle size as the special relating principle suggested in the paper. The method is advantageous in small sample quantity required, low cost and short measurement period for each individual analysis.
authors.affiliation: Research Institute of Petroleum Processing, China Petroleum & Chemical Corporation, Beijing 100083, China. xueyan@ripp-sinopec.com
authors.forename: Yan
authors.initials: Y
authors.lastname: Xue
authors.forename: Haiying
authors.initials: H
authors.lastname: Yang
authors.forename: Yongtan
authors.initials: Y
authors.lastname: Yang
mesh_terms: D019075:Electrophoresis, Capillary / Q000379:methods; D005742:Gasoline / Q000032:analysis*; D007526:Isoelectric Point; D010316:Particle Size; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D017641:Zeolites / Q000737:chemistry*
chemical_list: D005742:Gasoline; D017641:Zeolites