Change Of Dimethyl Ether To Lower Alkenes In Boron And Phosphorus-Containing Catalysts

Аннотация

In this study, the possibility of the formation of lower olefins from dimethyl ether and methanol on catalysts containing Mg-Zn-Zr-B-HSZ and Mg-Zn-Zr-P-HSZ was studied, and the process was evaluated quantum chemically. According to the results obtained by IR-Fur spectroscopy, during the catalytic conversion of DME (dimethyl ether) on the surface of catalysts containing Mg-Zn-Zr-B-HSZ and Mg- Zn-Zr-P-HSZ ketenes at temperatures below 180 °C and oxonium intermediates at 320 °C (intermediate). compounds) are confirmed by experimental spectra and theoretical quantum- chemical calculations. It was shown that the formation of olefins below DME occurs by the carbene mechanism at low temperatures and by the oxonylide mechanism at high temperatures. KEYWORDS Spectroscopy method, catalysts, experimental spectra, high siliceous zeolites, low-carbon, natural gas. ABBREVIATION DME-dimethyl ether; МТО - methanol to olefins; DTO - dimethyl ether to olefins; ZSM-5 - Zeolite Socony Mobil 5; HMDA – Hexamethylenediamine; Dimethyl ether-DME; HSZ – high siliceous zeolites; The US A Journals Volume 02 Issue 11-2020 34 The American Journal of Applied Sciences IMPACT FACTOR (ISSN – 2689-0992) 2020: 5. 276 Published: November 21, 2020 | Pages: 34-43 Doi: https://doi.org/10.37547/tajas/Volume02Issue11-07 OCLC - 1121105553