CATALYTIC SYNTHESIS OF LOWER UNSATURATED HYDROCARBONS FROM DIMETHYL ETHER

Abstract

In this work, the results on the creation of highly efficient catalytic systems with new content modified with various elements are summarized. At the same time, the effect of the nature of the modifying element, as well as the high temperature treatment with water vapour, on the structure, texture, acidic characteristics and catalytic activity of the catalyst with a new composition created in the catalytic conversion of dimethyl ether to ethylene and propylene was considered. In order to increase the stability of the Mg-Zn-Zr-B:HSZ catalyst, it was proved that unmodified Mg-Zn-Zr-B:HSZ showed high activity when it was modified with P and Fe and used in the synthesis of lower alkenes from methanol and dimethyl ether. In the work, the catalytic conversion of dimethyl ether to lower alkenes was carried out in the Mg- Zn-Zr-B:HSZ -containing catalyst under the following optimal conditions: (T = 340 ℃, R = 0.1 MPa, Var = 1000-2000 h-1. Raw materials: DME (15%)÷N2(85%) in the modification of zirconium- and magnesium-containing zeolite catalysts with B, it was proved that the selectivity for C2-C4 unsaturated hydrocarbons and the decrease in the amount of paraffins were observed in almost all cases.