Method of encapsulating materials in a zeolite in a stable manner

• US 4,414,005 A
• Filed: 10/06/1981
• Issued: 11/08/1983
• Est. Priority Date: 10/13/1980
• Status: Expired due to Term

• Current Assignee: European Atomic Energy Community Batiment Jean Monnet
• Original Assignee: The European Atomic Energy Community (Euratom)
• Inventors: Peeters, Guido J., De Bievre, Paul J., Vansant, Etienne F.
• Primary Examiner(s): Spitzer, Robert H.
• Application Number:
  US06/309,222
• Time in Patent Office: 763 Days
• Field of Search: 55/66, 55/75, 206/0.6, 206/0.7, 252/455 Z, 427/220, 427/226, 428/405
• US Class Current: 95/127
• CPC Class Codes: B01D 53/02 by adsorption, e.g. preparative gas chromatography solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01
• CPC Class Codes: B01J 20/186 Chemical treatments in view of modifying the properties of the sieve, e.g. increasing the stability or the activity, also decreasing the activity
• CPC Class Codes: F17C 11/00 Use of gas-solvents or gas-sorbents in vessels absorbing compositions for acetylene C10L3/04; absorbing compositions for hydrogen C01B3/0005
• CPC Class Codes: G21F 9/02 Treating gases

Abstract

The present invention relates to compounds, elements or ions encapsulated in a zeolite in a stable manner by adsorption, chemisorption or ion exchange, by using a zeolite treated before together with, or after the introduction of the material to be enclosed with a modifying agent selected from the group consisting of silanes, boranes and germanes, which may be substituted by one or more halogen atoms and/or hydrocarbon groups, and after the introduction closing the pores by a further treatment with the modifying agent and/or by an oxidation treatment.

Claims

1. A method of reducing the pore size of zeolites comprising treating a zeolite with a modifying agent to penetrate, be adsorbed in said pores and reduce the pore size in a controlled manner, said modifying agent being selected from the group consisting of silanes, halosilanes, alkylsilanes, boranes, haloboranes and alkylboranes, germanes, halogermanes and alkylgermanes.

2. The method of claim 1 wherein said modifying agent is selected from the group consisting of silane, dimethylsilane, dichlorodimethylsilane, methyl trichlorosilane and diborane.

3. A method of separating mixtures, which comprises contacting pore-containing zeolites with a mixture of components, selectively adsorbing at least one component of the mixture in the pores of the zeolite, separating the zeolite from the non-adsorbed component and desorbing the absorbed substances, said zeolite having been treated with a modifying agent selected from the group consisting of silanes, halosilanes, alkylsilanes, boranes, haloboranes and alkylboranes, germanes, halogermanes and alkylgermanes to reduce the pore size to a desired dimension.

4. A zeolite containing trapped material in the form of molecules or ions inside its pores, a major part of said pores being partially closed by a modifying agent selected from the group consisting of silanes, halosilanes, alkylsilanes, boranes, haloboranes and alkylboranes, germanes, halogermanes and alkylgermanes which are bound chemically or physically to the walls of the pores, the openings of said pores being too small to allow trapped materials from passing out of the pores.