TY - JOUR
T1 - Photocatalytic CO2 conversion on highly ordered mesoporous materials
T2 - Comparisons of metal oxides and compound semiconductors
AU - Lee, Yoon Yun
AU - Jung, Han Sol
AU - Kim, Ji Man
AU - Kang, Yong Tae
N1 - Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. NRF-2016R1A2B3007577 ) and by the Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation . Appendix A
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2018/5
Y1 - 2018/5
N2 - In this study, the ordered mesoporous metal oxides (TiO2 and SnO2) and compound semiconductors (ZnS, ZnSe, CdS, and CdSe) are manufactured and they exhibit several micrometers (μm) of particle size, and high surface area of about 100 m2g−1. Well-developed crystallinities are prepared via simple nano-replication method by using a 3-D bicontinuous cubic Ia3d meso-structured ordered mesoporous silica KIT-6 as a hard-template. The visible-light-driven photocatalytic CO2 conversion into CH4 is carried out in the presence of H2O over various mesoporous materials. Prepared mesoporous materials show different light absorption behaviors and photocatalytic activities for conversion of CO2. The mesoporous compound semiconductors show higher CO yield rates than the mesoporous metal oxides, while mesoporous metal oxides show higher CH4 yield rates than the mesoporous compound semiconductors. Compared to the commercial TiO2 material (P25, Degussa), the mesoporous metal oxides (TiO2, SnO2) show 9 to 10 times higher yields of CH4 and 2 to 3 times higher yields of CO owing to their high surface area. Especially, the mesoporous ZnS shows the highest CH4 yield rate (3.620 μmol gcat−1h−1) and the mesoporous CdSe shows the highest CO yield rate (5.884 μmol gcat−1h−1) out of all photocatalysts considered in the present study. Although mesoporous CdS and ZnSe have great visible light absorption properties, they show relatively low CH4 yield rates.
AB - In this study, the ordered mesoporous metal oxides (TiO2 and SnO2) and compound semiconductors (ZnS, ZnSe, CdS, and CdSe) are manufactured and they exhibit several micrometers (μm) of particle size, and high surface area of about 100 m2g−1. Well-developed crystallinities are prepared via simple nano-replication method by using a 3-D bicontinuous cubic Ia3d meso-structured ordered mesoporous silica KIT-6 as a hard-template. The visible-light-driven photocatalytic CO2 conversion into CH4 is carried out in the presence of H2O over various mesoporous materials. Prepared mesoporous materials show different light absorption behaviors and photocatalytic activities for conversion of CO2. The mesoporous compound semiconductors show higher CO yield rates than the mesoporous metal oxides, while mesoporous metal oxides show higher CH4 yield rates than the mesoporous compound semiconductors. Compared to the commercial TiO2 material (P25, Degussa), the mesoporous metal oxides (TiO2, SnO2) show 9 to 10 times higher yields of CH4 and 2 to 3 times higher yields of CO owing to their high surface area. Especially, the mesoporous ZnS shows the highest CH4 yield rate (3.620 μmol gcat−1h−1) and the mesoporous CdSe shows the highest CO yield rate (5.884 μmol gcat−1h−1) out of all photocatalysts considered in the present study. Although mesoporous CdS and ZnSe have great visible light absorption properties, they show relatively low CH4 yield rates.
KW - CO conversion
KW - Mesoporous materials
KW - Photocatalysts
KW - Yield rates
UR - http://www.scopus.com/inward/record.url?scp=85032980234&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2017.10.068
DO - 10.1016/j.apcatb.2017.10.068
M3 - Article
AN - SCOPUS:85032980234
SN - 0926-3373
VL - 224
SP - 594
EP - 601
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
ER -