منابع مشابه
Site requirements and elementary steps in dimethyl ether carbonylation catalyzed by acidic zeolites
Steady-state, transient, and isotopic-exchange studies of dimethyl ether (DME) carbonylation, combined with adsorption and desorption studies of probe molecules and infrared (IR) spectroscopy, were used to identify methyl and acetyl groups as surface intermediates within specific elementary steps involved in the synthesis of methyl acetate from DME–CO mixtures with >99% selectivity on H-zeolite...
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In situ IR spectroscopy was used to observe the intermediates formed on zeolites FAU and MFI during the synthesis of methyl methoxyacetate (MMAc) via carbonylation of dimethoxymethane (DMM) and the disproportionation of DMM to dimethyl ether (DME) and methyl formate (MF). Both reactions are initiated by the reaction of DMM with the Brønsted acid protons of the zeolite to form methanol and metho...
متن کاملLow-Temperature Oxidation of Dimethyl Ether to Polyoxymethylene Dimethyl Ethers over CNT-Supported Rhenium Catalyst
Due to its excellent conductivity, good thermal stability and large specific surface area, carbon nano-tubes (CNTs) were selected as support to prepare a Re-based catalyst for dimethyl ether (DME) direct oxidation to polyoxymethylene dimethyl ethers (DMMx). The catalyst performance was tested in a continuous flow type fixed-bed reactor. H3PW12O40 (PW12) was used to modify Re/CNTs to improve its...
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Nowadays available by clean industrial processes, dimethyl carbonate (DMC) possesses properties of nontoxicity and biodegradability which make it a true green reagent/solvent to devise syntheses that prevent pollution at the source. In particular, the versatile reactivity of DMC allows both methylation and carboxymethylation protocols that can replace conventional and highly noxious reagents su...
متن کاملSyngas Desulfurization over Metal Zeolites
Metal ox ides suppor ted on z e o l i t e s have been demonstrated as e f f e c t i v e regenerable 4 e s u l f u r i z a t i o n a g e n t s f o r h i g h tempera ture removal of hydrogen s u l f i d e from f o s s i l f u e l s . D e s u l f u r i z a t i o n occur s by s u l f i d e format ion wi th Fe or Zn on t h e s u r f a c e of t h e z e o l i t e l a t t i c e w i t h t h e hydrogen s...
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ژورنال
عنوان ژورنال: Journal of Energy Chemistry
سال: 2019
ISSN: 2095-4956
DOI: 10.1016/j.jechem.2019.04.015