Tungsten oxides supported on nano-size zirconia for cyclic production of syngas and hydrogen by redox operations

Chemical Looping Dry Reforming of Methane over Ni-Modified WO3/ZrO2: Cooperative Work of Dispersed Tungstate Species and Ni over the ZrO2 Surface

“…The previous ZrO 2 or Al 2 O 3 -supported WO 3 materials for CL-type POM were prepared with high WO 3 loading amount (30–50 wt%), resulting in the formation of a crystalline WO 3 phase detectable by XRD. Their application for CL-type POM and redox reactions was thus limited to high reaction temperature conditions (900–1000 °C). − The present study demonstrated the lower temperature CL-type POM (750 °C) using WO 3 -based materials by (1) controlling dispersion of surface tungstate species (active oxygen storage sites), (2) utilizing reducible ZrO 2 supports (reverse hydrogen spillover), and (3) modifying with Ni (recombination sites of surface hydrogen species).…”

“…H 2 pretreatment reduced the surface W 6+ to W 5+ /W 4+ species in the Pt/WO 3 /ZrO 2 system. , H 2 reduces the W species at the interface of WO X and Pt to produce active Brønsted acid sites. , In the previous reports on syngas production from CH 4 via CL reactions, redox properties of supported WO 3 have also been studied. Despite bulk or supported WO 3 in the CL steam reforming of CH 4 − high-temperature conditions (900–1000 °C) are required to reduce WO 3 by CH 4 . In contrast, in the CL-type POM, the Ni-modified WO 3 /Al 2 O 3 reacted with CH 4 at a milder reaction temperature (800 °C) .…”

Surface Properties of Glutathione Layer Formed on Gold Surfaces Interacting with ZrO2

“…금과 이산화지르코늄으로 구성된 물질들은 표면패턴화, 수소생산, 촉매제조, 그리고 태양광 전지 등의 여러 가지 분야들에 응용될 수 있는 가능성을 가지고 있다 [1][2][3][4][5][6]. 이 물질들은 빛에 의하여 태양에너 지 전환에 중요한 전자전송과정을 유도하는 여기상태로 전환되는데, 이 과정에서 물질의 활성도와 선택도는 구성물들의 분포에 따라 달 라진다 [7,8].…”