Tailoring a thermally stable amorphous SiOC structure applicable to membrane reactor for alkane dehydrogenation

2019 Fiscal Year Final Research Report

• Project/Area Number: 18K18978
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 27:Chemical engineering and related fields
• Research Institution: Hiroshima University
• Principal Investigator: Kanezashi Masakoto 広島大学, 工学研究科, 准教授 (10467764)
• Project Period (FY): 2018-06-29 – 2020-03-31
• Keywords: ゾル－ゲル法 / ヒドロシリル化 / SiOC構造 / 耐熱性 / 気体分離膜 / 分子ふるい

Outline of Final Research Achievements

In this project, SiOC network structure was tailored by utilizing triethoxysilane(TRIES)，vinyltrimethoxysilane(VTMS), and tetramethyldisiloxane(TMDSO) for improved thermal and oxidative stability. The network pore size depended on co-polymerization conditions: When TMDSO was introduced into VTMS-TRIES network structure, network pore size became looser. A SiOC membrane fabricated at 700 oC in N2 showed molecular sieving properties, particularly for large molecules. Oxidative stability was dramatically improved in comparison with conventional organosilica membranes, since each permeance and gas permeance ratio was relatively stable under oxidative atmosphere at 500 oC.

Free Research Field

化学工学，膜分離工学

Academic Significance and Societal Importance of the Research Achievements

本研究では，Si前駆体には，triethoxysilane(TRIES)，vinyltrimethoxysilane(VTMS)，tetramethyldisiloxane(TMDSO)を用い，架橋条件により，従来のオルガノシリカ膜と同様にアルカン脱水素反応に適したルースなネットワーク構造の形成が可能であっただけでなく，オルガノシリカの課題であった耐酸化性を大幅に向上させることに成功している。将来的には本研究成果で開発したSiOC膜をアルカン脱水素膜型反応器に応用できると考えられ，学術的意義が高い。