Route of glycerol conversion and product generation via TiO2-induced photocatalytic oxidation in the presence of H2O2

Jedsukontorn, Trin; Meeyoo, Vissanu; Saito, Nagahiro; Hunsom, Mali

doi:10.1016/j.cej.2015.06.078

Cited by 45 publications

(25 citation statements)

References 46 publications

(48 reference statements)

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“…Previous studies on photocatalytic conversion of glycerol and ethanol also reported the presence of similar products. [85][86][87][88][89][90][91][92][93][94][95] The value of ε in the present model for glycerol and ethanol were obtained 2.04 and 4.15, respectively. Consequently, they are almost twice and three times the corresponding power in L-H-based models where ε is considered 1.…”

Section: Kinetic Parameter Analysismentioning

confidence: 53%

An intrinsic kinetic model for liquid‐phase photocatalytic hydrogen production

2019

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A kinetic study was accomplished to describe the photocatalytic production of hydrogen in liquid phase. A reaction mechanism and a kinetic model were proposed to predict the rate of hydrogen production, which is a function of light intensity, catalyst loading, substrate concentration, and time. To assess the capability of the proposed model, glycerol and ethanol were selected as representative hydrogen sources (substrates). The experimental data performed under different operating conditions, based on Box-Behnken experimental design, were used to train the developed kinetic model, optimize the parameters using genetic algorithms and check its accuracy. The analysis confirms the validity of the model under different operating conditions. In addition, the ability of the model to predict the rate of hydrogen production for other substrates, photocatalysts, and operating conditions was confirmed by comparing model predictions with experimental data from literature.

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Section: Kinetic Parameter Analysismentioning

confidence: 53%

An intrinsic kinetic model for liquid‐phase photocatalytic hydrogen production

2019

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“…The mechanism of glycerol conversion to GCD, DHA, HPA, GCOA, FMD and GCAD has been proposed previously [ 12 , 68 , 69 ]. In brief, the photocatalytic oxidation of glycerol via TiO 2 occurred mainly at the 1°-OH groups to form GCD as the principle product and partially occurred at the 2°-OH group to form DHA.…”

Section: Resultsmentioning

confidence: 99%

“…In the last two decades, photocatalytic technology has been regarded as one of the most attractive processes due to its superior features, such as being environmentally benign, high efficiency, and operation at room temperature and atmospheric pressure. Many researchers have focused on this process, with versatile applications ranging from the field of wastewater and air remediation [ 8 , 9 ], carbon dioxide (CO 2 ) reduction [ 10 ], clean hydrogen (H 2 ) production [ 11 ] and the synthesis of high-value organic compounds [ 12 ], towards the development of an efficient solar-to-energy conversion [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Photoinduced Glycerol Oxidation over Plasmonic Au and AuM (M = Pt, Pd and Bi) Nanoparticle-Decorated TiO2 Photocatalysts

2018

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In this study, sol-immobilization was used to prepare gold nanoparticle (Au NP)-decorated titanium dioxide (TiO2) photocatalysts at different Au weight % (wt. %) loading (Aux/TiO2, where x is the Au wt. %) and Au–M NP-decorated TiO2 photocatalysts (Au3M3/TiO2), where M is bismuth (Bi), platinum (Pt) or palladium (Pd) at 3 wt. %. The Aux/TiO2 photocatalysts exhibited a stronger visible light absorption than the parent TiO2 due to the localized surface plasmon resonance effect. Increasing the Au content from 1 wt. % to 7 wt. % led to increased visible light absorption due to the increasing presence of defective structures that were capable of enhancing the photocatalytic activity of the as-prepared catalyst. The addition of Pt and Pd coupled with the Au3/TiO2 to form Au3M3/TiO2 improved the photocatalytic activity of the Au3/TiO2 photocatalyst by maximizing their light-absorption property. The Au3/TiO2, Au3Pt3/TiO2 and Au3Pd3/TiO2 photocatalysts promoted the formation of glyceraldehyde from glycerol as the principle product, while Au3Bi3/TiO2 facilitated glycolaldehyde formation as the major product. Among all the prepared photocatalysts, Au3Pd3/TiO2 exhibited the highest photocatalytic activity with a 98.75% glycerol conversion at 24 h of reaction time.

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“…[8][9][10] Even non-conventional photocatalytic pathways have been studied to find an efficient and sustainable way to valorize glycerol. [11][12][13][14][15][16][17][18] Recently, we demonstrated that plasmonic photocatalysis, utilizing noble metals as light absorbers and active centers, is a promising alternative to thermocatalytic glycerol oxidation. 19,20 To date, mainly noble metal catalysts have been investigated for the selective oxidation of glycerol in the aqueous phase 1,9,10 and only a few reports were published focusing on cost-efficient transition metal-based catalysts.…”

Section: Introductionmentioning

confidence: 99%