Magnetically modified nanogold-biosilica composite as an effective catalyst for CO oxidation

Loại tài liệu:

Article

Tác giả:

Holišová, Veronika

Đề mục:

Arabian Journal of Chemistry

Nhà xuất bản:

Elsevier Ltd.

Ngày xuất bản:

November 2019

Định dạng:

pdf

Nguồn gốc:

Arabian Journal of Chemistry, Volume 12, Issue 7 , November 2019, Pages 1148-1158

Ngôn ngữ:

eng

Lượt xem:

Lượt tải:

Nội dung

The temperature-dependent biosynthesis of gold nanoparticles (AuNP) using diatom cells of Diadesmis gallica was successfully performed. The resulting biosynthesis product was a bionanocomposite containing AuNP (app. 20 nm) subsequently anchored on the silica surface of diatomaceous frustules. As-prepared nanogold-biosilica composite was tested as catalyst in the oxidation of carbon monoxide using gas chromatograph with thermal conductivity detector. For catalytic activity enhancement, bionanocomposite was magnetically modified by ferrofluid using two different methods, i.e., with and without the use of methanol. The oxidation of CO at 300 °C was 58–60% in the presence of nanogold-biosilica composites. CO conversion at 300 °C was only 15% over magnetically responsive sample modified in the presence of methanol. On the other hand, complete CO conversion was reached over direct (without methanol) magnetically modified nanogold-biosilica composite at 330 °C (GHSV = 60 l g−1 h−1). Our results show, that the type of magnetic modification can influence the catalytic activity of bionanocomposite. The best catalytic effect in CO conversion established direct magnetically modified nanogold-biosilica composite.

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Magnetically modified nanogold-biosilica composite as an effective catalyst for CO oxidation

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