Metal-rich siliceous compositions and methods of producing same

Details Metal-rich siliceous compositions and methods of producing same Metal-rich siliceous compositions and methods of producing same

2011-08-23

2011-08-23

Choi, Ling-Siu (Department: 1763)

Colloid systems and wetting agents; subcombinations thereof; pro

Continuous liquid or supercritical phase: colloid systems;...

Aqueous continuous liquid phase and discontinuous phase...

C106S286100, C106S286700, C162S181600, C252S079000, C424S724000, C426S423000, C438S692000, C502S243000, C502S262000, C502S439000, C507S269000, C530S412000

Reexamination Certificate

active

08003707

ABSTRACT:
A modified sol-gel method to create metal-rich siliceous material, such as colloidal silica or aluminosilicate particles is disclosed. Initially, the metal salt of choice is added to a silicic acid solution or a silicic acid solution containing aluminum salt. The aluminum is added to vary the metal-support interaction as it forms Al—O—Si linkages within the silica matrix. Besides aluminum, other metals can be added that form M—O—Si (M=Ti, B, etc.) linkages, which do not become reduced when treated with a reducing agent. Once the metal, silicic acid and/or aluminum salt is generated, it is subjected to colloidal growth by addition to a basic heel. Upon colloidal synthesis, the metal salt containing colloidal particle is left as is to maximize colloidal stability or is reduced with hydrazine to produce the zero valence metal-containing colloidal particle. Keeping a particle colloidal before use may be an effective method of forming a catalyst material as it can be easily spray-dried or mixed with other materials for extruded catalyst particles.

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