Hydrogenation catalyst and methods for its preparation and use to convert silicon tetrachloride to chlorosilane and silane
AssigneeKorea Advance Institute of Science and Technology
InventorsIl N. Jung, Ko D. Cho, John C. Lim, Bok-Ryul Yoo
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Abstract
There is disclosed a redistribution catalyst which is the reaction product of a quaternary ammonium halide salt or tertiary amine, and an inorganic carrier having surface hydroxyl groups, such as silica, zeolite, clays, and silicone resins. The catalyst is useful for the redistribution of chlorosilicon hydrides to dichlorosilane and silane at reaction conditions of a temperature from 0.degree. to about 200.degree. C., and a pressure from about 0.1 to 10 atmospheres, in liquid or vapor phase.
Claims18
A catalytic composition for the disproportionation of chlorosilicon hydrides which comprises the solid reaction product of from 5 to 75 weight percent of:
- (a) an active catalytic ingredient having the formula:
- ##STR6## wherein:
- n is 1 to 4;
- R is alkyl having 1 to 4 carbons;
- R.sub.1 and R.sub.2 are the same or different alkyl or aryl groups having 1 to 8 carbons;
- R.sub.3 is an alkyl- or dialkyl-amino substituted alkyl having 1 to 20 carbons, with the alkyl groups of the amino group being monovalent alkyl or heterocyclic ring having 1 to 10 carbons;
- and
- X is chloride, iodide, or bromide;
- and
- (b) the balance being a silicon containing carrier selected from the class consisting of:
- (i) a surface hydroxyl bearing solid selected from the class consisting of silica, zeolite, clay, solid silicone resin, and the hydrolyzed solid of silicon compounds having the formula:
- R.sup.4 (CH.sub.2).sub.n SiX.sub.3
- wherein:
- n is 1 to 4;
- X is halide or alkoxy having 1 to 4 carbons;
- and
- R.sup.4 is hydrogen, alkyl, or aryl having a functional group of the class of --SH, --CH, ##STR7## pyrrolidine, and alkyl amino having 1 to 4 carbons;
- and (c) mixtures thereof.
The method for the preparation of a catalyst which comprises hydrolyzing, in a dilute aqueous, mineral acid, a mixture of:
- (1) an active catalytic ingredient having the formula:
- ##STR8## wherein:
- n is 1 to 4;
- R is alkyl having 1 to 4 carbons;
- R.sub.1 and R.sub.2 are the same or different alkyl or aryl groups having 1 to 8 carbons;
- R.sub.3 is a alkyl- or dialkyl-amino substituted alkyl having 1 to 20 carbons, with the alkyl groups of the amino group being monovalent alkyl or heterocyclic ring having 1 to 10 carbons;
- and
- X is chloride, iodide, or bromide;
- and
- (b) a silicon containing a compound in a proportion from 0.01 to 10 mols per mol of said active catalytic ingredient, said silicon containing compound having the formula:
- R.sup.4 (CH.sub.2).sub.n SiX.sub.3
- wherein:
- n is 1 to 4;
- X is halide or alkoxy having 1 to 4 carbons;
- and
- R.sup.4 is hydrogen, alkyl, or aryl having a functional group of the class of --SH, --CN, ##STR9## pyrrolidine, and alkyl amino having 1 to 4 carbons;
- and recovering and drying the solid product obtained from the hydrolysis.
Dependencies are inferred from the claim text.