Effect of Ga substitution with Al in ZSM-5 zeolite in methanethiol-to-hydrocarbon conversion.

The catalytic properties of conventional H-[Al]-ZSM-5 and gallium-substituted H-[Ga]-ZSM-5 were evaluated in the conversion of methanethiol to ethylene (CHSH → 1/2CH + HS). Dimethyl sulfide (DMS), aromatics, and CH were formed as byproducts on the H-[Al]-ZSM-5 catalyst. The introduction of Ga into the ZSM-5 structure provided a high ethylene yield with relatively high selectivity for olefins.

Synthesis of 2,5-dimethylhexene by isobutene dimerization with HS co-feeding.

This study investigates the effect of hydrogen sulfide (HS) co-feeding on the synthesis of 2,5-dimethyl-1-hexene, 2,5-dimethyl-2-hexene, and 2,5-dimethylhexane (2,5-DMHs), useful compounds, using the dimerization of isobutene under mild pressure conditions. The dimerization of isobutene did not proceed in the absence of HS, whereas the desired products of 2,5-DMHs were produced under HS co-feeding conditions. The effect of reactor size on the dimerization reaction was then examined, and the optimal reactor was discussed.

Highly stable Fe/CeO catalyst for the reverse water gas shift reaction in the presence of HS.

This study focused on evaluating the catalytic properties for the reverse water gas shift reaction (RWGS: CO + H → CO + HO Δ = 42.1 kJ mol) in the presence of hydrogen sulfide (HS) over a Fe/CeO catalyst, commercial Cu-Zn catalyst for the WGS reaction (MDC-7), and Co-Mo catalyst for hydrocarbon desulfurization. The Fe/CeO catalyst exhibited a relatively high catalytic activity to RWGS, compared to the commercial MDC-7 and Co-Mo catalysts.

Reductive removal of selenate (VI) in aqueous solution using rhodium metal particles supported on TiO.

Selenium and its compounds in high concentration are toxic for humans, especially selenate (VI) is the most toxic due to its high solubility in water. To promote the reductive reaction of Se(vi) to Se(iv) or Se(0), which is relatively easy to remove in water, noble metal particles were added as reaction sites with a reductant. The highest removal performance of selenate in aqueous solution was achieved using rhodium particles supported on TiO (Rh/TiO).

As(iii) removal through catalytic oxidation and Fe(iii) precipitation.

To remove arsenite (As(iii)) from wastewater effectively, the catalytic oxidation of As(iii) to arsenate (As(v)) and As(v) precipitation with iron ions (Fe(iii)) was investigated. The Pt/SiO catalyst functioned as a reaction site for As(iii) with oxygen in the atmosphere. The combination of the Pt/SiO catalyst and Fe(iii) precipitant improved the removal of As(iii) in the precipitate; Pt/SiO worked as both an As(iii) oxidation site and precipitation site with Fe(iii) precipitant.

Dual mechanoluminescence system comprising a solid-state di-copper(I) complex containing N-heterocyclic carbene ligands.

A simple N-heterocyclic carbene (NHC) ligand linked to a flexible propylene linker allows the formation of "Cu-Cu"- and "2 Cu"-type geometries inside a molecular framework. The incorporation of two Cu(i) ions in close proximity was observed in the Cu-Cu-type geometry but not in the 2 Cu-type geometry. In this study, the ground-state geometries of solid-state di-copper(i) complexes containing NHC ligands with ethyl substituents were modulated by external stimuli.