Hydrothermal Synthesis of Complex Metal Oxides by Assembling MO6 Octahedra and Creation of Solid Acid

2014 Fiscal Year Final Research Report

• Project/Area Number: 24760635
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Catalyst/Resource chemical process
• Research Institution: Hokkaido University
• Principal Investigator: MURAYAMA Toru 北海道大学, 触媒化学研究センター, 助教 (60583531)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 複合酸化物 / 固体酸 / 触媒 / 結晶性 / 水熱合成 / タングステン / ニオブ

Outline of Final Research Achievements

Layered-structure-type tungsten based complex oxides (W-M-O, M= Ti, Zr, Nb, Ta) were synthesized by the hydrothermal method. The synthesized W-M-O showed characteristic peaks at 2θ = 22.7° and 46.2° in an X-ray diffraction pattern (Cu-Ka), indicating linear corner-sharing of MO6 octahedra in the c-direction. The same layered-type materials were obtained with a wide range of W and M composition ratios by using soluble precursors. The catalytic activity of W-M-O increased with increase in the W ratio, suggesting that strong acid sites were generated. From Raman and adsorption measurements of W-M-O with various crystalline structures, it was revealed that the crystalline motif of W-M-O in the a-b plane was an interconnection of MO6 octahedra and {M6O21} pentagonal units and micropore channels but without long-range order.

Free Research Field

触媒化学