Process for preparation of synthetic mordenite molded body
First Claim
1. An improvement in a process for the preparation of a synthetic mordenite molded body, which comprises molding a starting mixture consisting essentially of as the main components a silica source, an alumina source, an alkali source and water to obtain a starting molded body, calcining the molded body to obtain a calcined molded body and crystallizing the calcined molded body in an aqueous solution of sodium silicate, wherein the improvement comprises (a) making a mordenite seed crystal powder present in the starting mixture, in an amount of 0.1 to 10% by weight based on the starting mixture on a dry basis;
- (b) when the starting molded body is calcined, elevating the temperature by heating to a calcination temperature not lower the 400°
C. at an average elevation rate of at least 10°
C./min and carrying out the calcination at said calcination temperature within 2 hours; and
(c) when the calcined molded body is crystallized, using an aqueous solution of sodium silicate having an SiO2 concentration of 7 to 25% by weight, an Na2 O concentration of 2 to 8% by weight and an SiO2 /Na2 O molar ratio of from 0.9 to 4.0 as the aqueous solution of sodium silicate.
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Abstract
A synthetic mordenite molded body is prepared by a process wherein a starting mixture comprising, as the main components, a silica source, an alumina source, an alkali source and water is molded into a starting molded body, the molded body is calcined and the calcined molded body is heated in an aqueous solution of sodium silicate. The starting mixture has incorporated therein a mordenite seed crystal powder. When the molded body is calcined, the temperature is elevated by heating to a calcination temperature not lower than 400° C. at an average rate of at least 10° C./min and calcination is conducted at the calcination temperature within a time period of 2 hours. When the calcined molded body is crystallized, an aqueous solution of sodium silicate having an SiO2 concentration of 7 to 25% by weight, an Na2 O concentration of 2 to 8% by weight and an SiO2 /Na2 O molar ratio of from 0.9 to 4.0 is used as the aqueous solution of sodium silicate.
17 Citations
12 Claims
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1. An improvement in a process for the preparation of a synthetic mordenite molded body, which comprises molding a starting mixture consisting essentially of as the main components a silica source, an alumina source, an alkali source and water to obtain a starting molded body, calcining the molded body to obtain a calcined molded body and crystallizing the calcined molded body in an aqueous solution of sodium silicate, wherein the improvement comprises (a) making a mordenite seed crystal powder present in the starting mixture, in an amount of 0.1 to 10% by weight based on the starting mixture on a dry basis;
- (b) when the starting molded body is calcined, elevating the temperature by heating to a calcination temperature not lower the 400°
C. at an average elevation rate of at least 10°
C./min and carrying out the calcination at said calcination temperature within 2 hours; and
(c) when the calcined molded body is crystallized, using an aqueous solution of sodium silicate having an SiO2 concentration of 7 to 25% by weight, an Na2 O concentration of 2 to 8% by weight and an SiO2 /Na2 O molar ratio of from 0.9 to 4.0 as the aqueous solution of sodium silicate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- (b) when the starting molded body is calcined, elevating the temperature by heating to a calcination temperature not lower the 400°
Specification