Patent ID: 6296937
Filing Date: 2001-10-02
Classification: B01D,B01J,C12Q,G01N,Y10T

Abstract:
A particulate adsorbent comprising particles which consist essentially of:(a) at least one core consisting essentially of a transition metal-containing component selected from the group consisting of superparamagnetic materials, low Curie Temperature materials, and mixtures thereof, and(b) a siliceous oxide coating on the surface of said core(s),wherein said coating covers the entire surface of said core(s) such that said adsorbent particles have a transition metal leach value when present as 0.33 g dried adsorbent particles in 20 ml of 1N hydrochloric acid aqueous solution for 15 minutes of less than about 50 ppm metal based on the weight of said solution.