کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11026937 | 1666339 | 2018 | 38 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Visible light driven CO2 reduction to methanol by Cu-porphyrin impregnated mesoporous Ti-MCM-48
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
Mesoporous Ti-MCM-48 photocatalyst, with Si/Ti (wt/wt) ratio of 100, 50 and 25 was effectively applied for CO2 reduction into methanol under UV-visible light irradiation bearing mid gap energy states and Ti3+ sites. The bare Ti-MCM-48 with Si/Ti (wt/wt) ratio of 25 displayed highest photocatalytic methanol yield (85.88â¯Î¼molâ¯gâ1â¯Lâ1) with a BET surface area of 1528â¯m2â¯gâ1 and mid gap energy states as determined from the XPS analysis, compared to the other composite ratios. The Ti-MCM-48(25) impregnated with Cu-porphyrin (CuTPP) resulted in methanol yield of 297â¯Î¼mol·gâ1 under 33â¯mW·cmâ2 simulated light intensity, using 0.1â¯M Na2SO3 in 0.1â¯M NaOH as supporting electrolytes, which is 3.45 times higher than the bare Ti-MCM-48(25) due to the visible light excitation of the porphyrin macrocycle and charge transition from the lowest occupied molecular orbital (LUMO) of CuTPP to the Ti3+ metal centers. Also, methanol yield was studied with CO2 gas-liquid mass transfer and mass transfer limitations prevailing in the reactor. Mass transfer limitation experiments revealed that metal loading, catalyst concentration, stirring speed and light intensity influence the methanol yield.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Liquids - Volume 272, 15 December 2018, Pages 656-667
Journal: Journal of Molecular Liquids - Volume 272, 15 December 2018, Pages 656-667
نویسندگان
Saad Nadeem, Asad Mumtaz, Mudassar Mumtaz, M.I. Abdul Mutalib, Maizatul Shima Shaharun, Bawadi Abdullah,