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Process for preparation of synthetic mordenite molded body

  • US 4,861,571 A
  • Filed: 09/19/1986
  • Issued: 08/29/1989
  • Est. Priority Date: 09/20/1985
  • Status: Expired due to Fees
First Claim
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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.

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