Generation mechanism of strong acidic property of Zr-based mixed metal oxide catalysts and the improvement

2014 Fiscal Year Final Research Report

• Project/Area Number: 25630369
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Catalyst/Resource chemical process
• Research Institution: The University of Tokushima
• Principal Investigator: YAMAMOTO Takashi 徳島大学, 大学院ソシオ・アーツ・アンド・サイエンス研究部, 准教授 (70361756)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 固体強酸触媒 / 酸化ジルコニウム / 酸化タングステン / 酸性質発現機構 / 構造解析

Outline of Final Research Achievements

Various kinds of tungsten oxide catalysts supported on metal-ion doped zirconium oxide (WOx/M-ZrO2) were characterized by alkylation of anisole by benzylalcohol, XRD and X-ray absorption spectroscopic techniques to clarify generation mechanism of strong acidic property of ZrO2-based catalysts. Tungsten oxide catalyst supported on crystalline monoclinic-type ZrO2 without metal-ion added was inert for the Friedel-Crafts reaction, while it was promoted by addition of some kinds of metal ion to ZrO2. Activity of WOx/M-ZrO2 strongly depends on ionic radius of doped elements, and was found to be maximum at around 0.87 nm. WO3 small aggregates (cluster) on tetragonal ZrO2 exhibit strong solid acidity unless doped-element and tungsten species react to form binary oxides.

Free Research Field

触媒化学