Single-step conversion of ethanol into n-butene-rich olefins over metal catalysts supported on ZrO2-SiO2 mixed oxides

Reaction Pathways of Methanol Reforming over Pt/α-MoC Catalysts Revealed by In Situ High-Pressure MAS NMR

“…In contrast to solution NMR, which typically analyzes the chemicals in the liquid phase, in situ solid-state magic-angle spinning (MAS) NMR allows simultaneous and quantitative tracking of reactants, intermediates, and products in systems containing solid, liquid, and gas phases, as the entire reaction system is placed in the NMR coil where the nuclear spins are polarized. ,, Prior to this, in situ MAS NMR techniques have been successfully applied in studying biomass conversion, ethanol to n -butene, CO 2 hydrogenation reaction, carbonylation reaction, and alkylation reaction, where 13 C-labeled chemicals were mainly utilized and detected. ,− The dissolved, adsorbed, or vaporized chemicals were monitored in different reaction systems, e.g., the transformation of cyclohexene as the intermediate of an alkylation reaction between cyclohexanol and phenol, the quantity of glucose in zeolite pores during the glucose isomerization reaction, and gaseous isopropanol under the reaction condition of hydrogenolysis of alkyl ether while isopropanol served as a hydrogen donor . As the methanol steam reforming reaction involves chemicals in liquid and gas phases (CH 3 OH, H 2 , HCHO, HCOOH, CO, CO 2 ), in situ MAS NMR will help to better explore the dynamic evolution and underlying mechanism, where the chemical species can be quantified via time-resolved 1 H and/or 13 C MAS NMR.…”