Do-Young Hong

High Uptakes of CO2 and CH4 in Mesoporous Metal—Organic Frameworks MIL-100 and MIL-101

Mesoporous MOFs MIL-100 and MIL-101 adsorb huge amounts of CO2 and CH4. Characterization was performed using both manometry and gravimetry in different laboratories for isotherms coupled with microcalorimetry and FTIR to specify the gas-solid interactions. In particular, the uptake of carbon dioxide in MIL-101 has been shown to occur with a record capacity of 40 mmol g(-1) or 390 cm3STP cm(-3) at 5 MPa and 303 K.

Direct hydrogenation of biomass-derived butyric acid to n-butanol over a ruthenium-tin bimetallic catalyst.

Catalytic hydrogenation of organic carboxylic acids and their esters, for example, cellulosic ethanol from fermentation of acetic acid and hydrogenation of ethyl acetate is a promising possibility for future biorefinery concepts. A hybrid conversion process based on selective hydrogenation of butyric acid combined with fermentation of glucose has been developed for producing biobutanol. ZnO-supported Ru-Sn bimetallic catalysts exhibits unprecedentedly superior performance in the vapor-phase hydrogenation of biomass-derived butyric acid to n-butanol (>98% yield) for 3500 h without deactivation.

Microwave synthesis, characterization and catalytic properties of titanium-incorporated ZSM-5 zeolite

Titanium-incorporated ZSM-5 zeolites (Si/Al = 50–200 and Si/Ti = 70) were successfully synthesized in a one-step sol-gel process under microwave irradiation. The characteristics of Ti-ZSM-5 zeolites were investigated using X-ray power diffraction, UV/Vis-DRS, FT-IR spectroscopy and solid-state 27Al-NMR to monitor the physico-chemical properties. Simultaneously, the acidic properties were characterized by the NH3-TPD profile. The characterization results revealed that the Ti4+ and Al3+ ions were well incorporated into the framework of Ti-ZSM-5 zeolite. The prepared zeolite was moderately active but selective in the dehydration of methanol to dimethyl ether.

Plasma-Assisted Non-Oxidative Conversion of Methane over Mo/HZSM-5 Catalyst in DBD Reactor

Methane utilization has been recognized as a challenging research topic because methane is very stable with strong C–H bond. Many efforts have been devoted to find an effective method for the methane activation. In this work, we examined the feasibility of decreasing the temperature of a non-oxidative methane dehydroaromatization by using DBD plasma-catalyst hybrid system. Mo/HZSM-5 catalyst was prepared and then it was used for the DBD plasma-assisted methane dehydroaromatization reaction. When the DBD plasma was applied to the Mo/HZSM-5 catalytic reactor, methane was converted at much lower temperatures than the conventional methane dehydroaromatization process. It was also confirmed that benzene selectivity could be improved by enhancing the interaction between plasma and catalyst. These results imply that the non-oxidative methane dehydroaromatization could occur effectively at milder conditions than the conventional process by using the optimized DBD plasma-catalyst hybrid system. Moreover, it was observed that the catalyst deactivation was effectively prevented when H2 gas was mixed with the reaction feed.