Effects of Acid Treatment on the Acidic Properties and Catalytic Activity of MCM-41 for the Oxidative Dehydrogenation of Isobutane

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Yuuki Katou²  Keizo Nakagawa¹  Hisanobu Misu³  Ai Itagaki³  Wataru Ninomiya²  Masahiro Katoh¹  Shigeru Sugiyama¹  Takuya Ehiro³ 

[1] Department of Advanced Materials, Institute of Technology and Science, Tokushima University;Otake Research Laboratories, Mitsubishi Rayon Co., Ltd.;Department of Chemical Science and Technology, Tokushima University

关键词: Oxidative Dehydrogenation;    Isobutane;    MCM-41;    Acid Treatment;    Template Ion Exchange;   

DOI  :  10.1252/jcej.15we155

来源: Maruzen Company Ltd

【 摘 要 】

References(24)Mesoporous silicas have shown promise as materials for solid catalysts or catalyst supports due to their unique characteristics. Metal-doped mesoporous silicas are known to be catalytically active in the oxidative dehydrogenation (ODH) of isobutane. However, heavy-metal-free mesoporous silicas have not been studied closely for their use as catalysts. In the present study, MCM-41 (#41 Mobil composition of matter) was acid-treated to enhance its catalytic activity, although pure MCM-41 was confirmed as catalytically inactive for the ODH of isobutane (isobutene yield=0.9%). The pH of a slurry of as-synthesized MCM-41 was changed during acid treatment. A pH adjustment to 6.5 resulted in great improvement in catalytic activity (isobutene yield=6.1%), but a pH adjustment to 4.5 resulted in insufficient improvement (isobutene yield=4.5%). It was confirmed via XRD and N2 adsorption-desorption measurement that the pH adjustment to 4.5 degraded the ordered structure of MCM-41. This degradation would be a crucial factor that would render acid treatment less effective. In addition to the acid treatment, Al doping to MCM-41 was conducted. Al doping also greatly enhanced the acidity and catalytic activity of MCM-41.

【 授权许可】

Unknown