Photocatalytic Reduction of Carbon Dioxide to Methane over SiO2-Pillared HNb3O8

详细信息    查看全文

• 作者：Xiukai Li ; Wei Li ; Zongjin Zhuang ; Yushu Zhong ; Qing Li ; Liya Wang
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：August 2, 2012
• 年：2012
• 卷：116
• 期：30
• 页码：16047-16053
• 全文大小：365K
• 年卷期：v.116,no.30(August 2, 2012)
• ISSN：1932-7455

文摘

Carbon dioxide (CO₂) photoreduction by gaseous water over silica-pillared lamellar niobic acid, viz. HNb₃O₈, was studied in this work. The physicochemical characteristics of samples were examined by techniques such as XRD, FT-IR, SEM, TEM, and UV鈥搗isible diffuse reflectance spectroscopy. Aspects that influence CO₂ photoreduction, such as the layered structure, the protonic acidity, silica pillaring, and cocatalyst loading, were investigated in detail. Pt loading obvious promoted the activity for CO₂ photoreduction to methane. The loading of Pt also promoted the formation of methane from catalyst associated carbon residues, although this contributes insignificantly to the overall amount of methane produced. The layered structure and the protonic acidity of the lamellar niobic acid have significant influences on CO₂ photoreduction by water in gas phase. With layered structure, expanded interlayer distance, and stronger intercalation ability to water molecules, the silica pillared niobic acid showed much higher activity than the nonpillared niobic acid, Nb₂O₅, and TiO₂. Because of the unique adsorption ability to water molecules through hydrogen bonding, the activity of silica pillared HNb₃O₈ increased more remarkably with elevated water content than the mostly investigated TiO₂ photocatalyst.