In the study, effect of volumetric velocity initial gaseous mixture on catalytic properties Zn-Zr-Cu/HSZ/Al$_2$O$_3$ in conversion dimethyl ether to olefins was studied. When rate is increased by 5 times, decreases from 96.5 40.7 %, total selectivity for C$_2$=-C$_4$=olefins 59.0 75.5 mas.%, at same time, yield by-products reaction - C$_2$ + paraffin reduced. A decrease temperature equal leads ...

H-ZSM-5 nano-zeolites were synthesized by hydrothermal method using tetrapropylammonium hydroxide (TPAOH) as a template in the presence of various TPABr concentrations. The effect of different TPABr/TPAOH molar ratios was studied on the catalytic performance of dehydration of methanol to dimethyl ether (DME) in a fixed bed reactor under the same operating conditions (T=300°C, P=1 atm, and WHSV=...

Dimethyl ether (DME) is a synthetically produced alternative fuel to diesel-based and could be used in ignition diesel engines due increasing energy demand. DME considered extremely clean transportation green because it has high cetane number (around 60), low boiling point (−25 °C), oxygen amount (35 wt%) which allow fast evaporation higher combustion quality (smoke-free operation 90% fewer NOx...

A new class of silica-based zeolite capsule catalyst was readily prepared employing a dual-layer method under close-to-neutral conditions. In a tandem catalysis process, the precisely controlled synthesis of dimethyl ether was realized. This new concept of H-type zeolite shell preparation and application represents a powerful approach for preparing high-performance, multifunctional catalysts.

The first enantioselective synthesis of the fungal metabolite (+)-O-methylasparvenone was achieved in eight steps and 22% overall yield from inexpensive 3,4,5-trimethoxybenzaldehyde dimethyl acetal. Key steps include (i) early-stage asymmetric alkynylation of an aromatic aldehyde with a propiolate, (ii) intramolecular Friedel-Crafts acylation, and (iii) site-selective cleavage of an aryl methyl...

PtX technologies are one major building block of the future energy system based on renewables sources. Dimethyl ether (DME) is an important product that can be used as intermediate production CO2-neutral base chemicals. New applications lead to increase global and optimization process efficiency, especially when considering decentralized synthesis. This review article puts some spotlights recen...

Four chemical races were detected in Pulicaria dysenterica, when sampled within Europe, on the basis of the surface flavonoids present. One race uniquely contained quercetagetin 3,7-dimethyl ether and another 6-hydroxykaempferol 3,4'-dimethyl ether. A third race was based on plants having 6-hydroxykaempferol 3,7-dimethyl ether together with quercetagetin 3,7,3'-trimethyl ether. The fourth race ...

Rose (Rosa hybrida) flowers produce and emit a diverse array of volatiles, characteristic to their unique scent. One of the most prominent compounds in the floral volatiles of many rose varieties is the methoxylated phenolic derivative 3,5-dimethoxytoluene (orcinol dimethyl ether). Cell-free extracts derived from developing rose petals displayed O-methyltransferase (OMT) activities toward sever...