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Thanh Nguyen Huu,Shaariikhuu Erdenechimeg,Nguyen Thi Xuyen,Hossain Muhammad Sarwar,Tae Eunju Lee,Reddy Guda Dinneswara,윤경병 대한화학회 2023 Bulletin of the Korean Chemical Society Vol.44 No.4
Cross-linked polystyrene and polydivinylbenzene (PDVB) have unreacted pendant vinyl groups. They readily undergo aging or oxidation with air even at room temperature, giving rise to formation of OH and (CO)CH3 groups within the polymers. We now report that the aging process involves the release of carbon monoxide (CO) and hydrogen (H2) in significant amounts at 40 C and the rate increases with time and temperature. The amounts of CO and H2 released from PDVB at a given temperature can be expressed using a polyno- mial equation of Aa = Bt + Ct2, where Aa is the accumulated amount, t is the time in the unit of day, and B and C are the coefficients. The coefficients B and D increase with increasing temperature. This result shows that the storage rooms for the above polymers and their composites should be well ventilated to prevent inhalation of CO by the workers and H2-induced potential hazards.
KOIRALA AGNI RAJ,Thanh Nguyen Huu,Shaariikhuu Erdenechimeg,Nguyen Thi Xuyen,Hossain Muhammad Sarwar,윤경병 대한화학회 2023 Bulletin of the Korean Chemical Society Vol.44 No.4
We report the map of 20 reactions that take place during vapor-phase photo- chemical dehydrogenation of ethanol on four metal-doped TiO2 (Mn/TiO2, Mn = nanoparticles of Pd, Pt, Au, and Cu) under solar simulated light. The reac- tions are sensitively affected by the moisture amount and the nature of the car- rier gas. To construct the above map, we also used CH3CHO, CH3CO2H, (C2H5O)2CHCH3, and CH3CO2C2H5, respectively, as an independent starting reagent. Amazingly, Mn/TiO2 not only serves as photocatalysts but also as ther- mocatalysts for various reactions that appear in the above map. The reaction is proposed to proceed by a radical mechanism in which photoinduced electron transfer from the valence band to the conduction band of TiO2 is the initial step and the subsequent electron injection from organic reactants to the hole in the TiO2 valence band. This report also features highly valuable unprece- dented reactions, which bear great potential to be commercialized.