Print: | ISSN 0304-128X |
Online: | ISSN 2233-9558 |
Korean Chemical Engineering Research,
Vol.54, No.3, 419-424, 2016 황이 포함된 중형기공성 탄소에 화학적으로 고정화된 H5PMo10V2O40 촉매 상에서 Benzyl Alcohol 산화반응
Benzyl Alcohol Oxidation over H5PMo10V2O40 Catalyst Chemically Immobilized on Sulfur-containing Mesoporous Carbon
황이 포함된 중형기공성 탄소 담체(S-MC)에 화학적으로 고정화된 H5PMo10V2O40 (PMo10V2) 촉매를 제조하고, 이를 Benzyl alcohol 산화반응에 적용해보았다. 먼저 주형물질로 SBA-15, 탄소 전구체로 p-Toluenesulfonic acid를 이용하여 S-MC 지지체를 제조하였다. 이후, PMo10V2 촉매가 화학적으로 고정화될 수 있는 위치를 제공하기 위해 S-MC 지지체의 표면이 양전하를 띠도록 개질시켰다. 전체적으로 음전하를 띠는 [PMo10V2O40]5.를 이용함으로써 PMo10V2를 양이온을 띠는 S-MC 표면에 화학적으로 고정화하였다. 화학적 고정화를 통해 PMo10V2가 분자수준으로 균일하게 분산되었음을 확인하였다. Benzyl alcohol의 기상 산화반응에서 PMo10V2/S-MC 촉매는 무담지 상태의 PMo10V2보다 높은 전화율 및 수율을 나타냈다. PMo10V2/S-MC 촉매의 반응 활성이 향상된 이유는 화학적 고정화를 통해 PMo10V2이 S-MC 지지체에 고르게 분산되었기 때문이다.
H5PMo10V2O40 (PMo10V2) catalyst chemically immobilized on sulfur-containing mesoporous carbon (SMC) was prepared, and it was applied to the benzyl alcohol oxidation reaction. S-MC was synthesized by a templating method using SBA-15 and p-toluenesulfonic acid as a templating agent and a carbon precursor, respectively. S-MC was then modified to have a positive charge, and thus, to provide sites for the immobilization of PMo10V2. By taking advantage of the overall negative charge of [PMo10V2O40]5-, PMo10V2 catalyst was immobilized on the S-MC support as a charge matching component. It was revealed that PMo10V2 species were finely and molecularly dispersed on the S-MC via chemical immobilization. In the vapor-phase oxidation of benzyl alcohol, PMo10V2/S-MC catalyst showed higher conversion of benzyl alcohol and higher yield for benzaldehyde and benzoic acid than unsupported PMo10V2 catalyst. The enhanced catalytic performance of PMo10V2/S-MC was due to fine dispersion of PMo10V2 species on the S-MC via chemical immobilization.
Keywords:
Heteropolyacid catalyst; Sulfur-containing mesoporous carbon; Chemical immobilization; Benzyl alcohol oxidation
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