TITLE: Synthesis and Modification of Zeolite Catalysts for Producing Short-Chain Olefins from Methanol and Synthesis Gas.

AUTHOR: V. Heinze.

INST.  AUTHOR: Gesamthochschule Paderborn (Germany, F.R.). Fachbereich 13 - Chemie und Chemietechnik.

LANGUAGE: German

PUB.  TYPE: Technical Report

PUB.  COUNTRY: Germany Federal Republic

SOURCE: Department of Energy [DEE],  10 Jan 86,  109p.

NTIS ORDER NO.: DE87770050/INW

ABSTRACT:

Boron-containing zeolites of the medium-pored pentasil type and the close-pored erionite-offretite type were synthesized, and the reaction conditions were optimized with regard to reaction times and product crystallinity. For example, the use of seed crystals resulted in a reduction of the crystallisation time from 120 to 60 h in the pentasil type. Pyrogenic silica gel can be substituted by silicate of sodium as a SiO/sub 2/ source. Substitution of organic ammonium compounds by less expensive substrates like alcohols or acetone can be recommended only for tert. butanol. The erionite-offretite-type zeolite, which has high boron and silicon concentrations, was synthesized for the first time and identified by IR spectroscopy and by Guinier radiography. The reaction mechanism of methanol or DME conversion was investigated. Modified Fischer-Tropsch synthesis experiments showed that the highest C/sub 2/-C/sub 4/ olefin selectivity was obtained with the iron-doped zeolite type A as catalyst (T=270 to 310/sup 0/C; p=1.5 to 2.2 MPa). (ERA citation12:016405)

REPORT  NUMBER: NP-7770050

ANNOUNCEMENT: 8715