Product desorption limitations in selective photocatalytic oxidation

Renckens, T.J.A.; Almeida, Ana R.; Damen, Martijn R.; Kreutzer, Michiel T.; Mul, Guido

doi:10.1016/j.cattod.2009.12.002

Cited by 20 publications

(24 citation statements)

References 25 publications

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“…In operando photocatalytic studies have been traditionally used to investigate reaction mechanisms using infrared spectroscopy (Rohmann et al, 2008 ; Renckens et al, 2010 ; Hauchecorne and Lenaerts, 2013 ; Zandi and Hamann, 2016 ). In the last decade, in operando analysis of the photocatalyst surface has been widely carried out using advanced (time-resolved) X-ray spectroscopy techniques, with emphasis into photoelectrochemical water splitting and hydrogen evolution processes (Braun et al, 2012 ; Bora et al, 2013 ; Crumlin et al, 2015 ; Baran et al, 2016 ; Li et al, 2016b ; Neppl et al, 2016 ; Lu et al, 2020 ).…”

Section: Qualitative Approaches For the Assessment Of Photocatalytic mentioning

confidence: 99%

Qualitative Approaches Towards Useful Photocatalytic Materials

Quesada-Cabrera

Parkin

2020

Front. Chem.

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The long-standing crusade searching for efficient photocatalytic materials has resulted in a vast landscape of promising photocatalysts, as reflected by the number of reviews reported in the last decade. Virtually all of these reviews have focused on quantitative approaches aiming at developing an understanding of the underlying mechanisms behind photocatalytic behavior and the parameters that influence structure-function correlation. Less attention has been paid, however, to qualitative measures around the development and assessment of photocatalysts. These measures will contribute toward narrowing the range of potential photocatalytic materials for widespread applications. The current report provides a critical perspective over some of the main factors affecting the assessment of photocatalytic materials as a code of good practice. A case of study is also provided, where this qualitative analysis is applied to one of the most prolific materials of the last-decade, disorder-engineered, black titanium dioxide (TiO 2).

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Section: Qualitative Approaches For the Assessment Of Photocatalytic mentioning

confidence: 99%

Qualitative Approaches Towards Useful Photocatalytic Materials

Quesada-Cabrera

Parkin

2020

Front. Chem.

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“…Similart emperature dependencies reported in the literature were ascribed to adsorption-desorption equilibria. [9,10] Mul and co-workers [12,13] encountered ar elated issue for the photooxidation of cyclohexaneo ver TiO 2 .T he unfavorable desorption of water limited the adsorption capacity for cyclohexane at low temperature. This explanation maya lso hold for the Figure 1.…”

Section: Influence Of Temperaturementioning

confidence: 99%

Cl₂ Production by Photocatalytic Oxidation of HCl over TiO₂

et al. 2019

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We studied the photocatalytic aerobic oxidation of HCl over TiO2 for producing Cl2. Steady‐state Cl2 production rates were determined with a photocatalytic fixed‐bed gas‐phase reactor equipped with UV light‐emitting diodes (LEDs) using iodometric titration as online analytics. We found stable Cl2 production rates of up to 16 mmol h−1 m−2 for commercial anatase TiO2 Hombikat UV100. The rate increased linearly with temperature from 21 to 140 °C, indicating the acceleration of the limiting desorption rate of the coupled product water. Comparing different TiO2 polymorphs revealed that anatase possesses higher activity than rutile. The adsorption of HCl was monitored in situ by IR spectroscopy. The IR spectra indicated that HCl chemisorption chlorinates the surface of TiO2 under the reaction conditions, suggesting it to be the first step of the reaction mechanism. High stability opens up the opportunity of developing a promising photocatalytic process of HCl recycling at lower temperatures suitable for reaching full conversion.

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“…But in selective formation, desorption of the desired product from the catalyst surface takes place, thus stopping it from undergoing the further oxidation steps to total mineralization, whereas, in selective degradation, the adsorbed contaminant and its oxygenated intermediates stick onto the catalyst surface until they are finally completely mineralized. Selectivity in NTO photocatalysis is achieved through one or more of the following approaches: (i) attraction of the targets towards the catalyst, 7,8,[20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] (ii) adsorption of the targets on the catalyst surface, 8,22,24,28,[40][41][42][43][44][45][46] (iii) desorption of the products from the catalyst surface, [47][48][49][50][51][52][53][54] (iv) doping effect, [55][56][57][58]…”

Section: Selectivity In Nto Photocatalysismentioning

confidence: 99%

“…Hydrophilic/hydrophobic (polar/nonpolar) interactions play a crucial role in desorption of the desired product from the NTO catalyst surface. [47][48][49][50][51][52][53] NTO incorporated into clays can form hydrophobic surfaces, [47][48][49] which have been used for selective formation of different organic compounds. TiO 2 pillared on three different clays (mica, montmorillonite and saponite) produced only 3.2% CO 2 from an aqueous solution of benzene; the remainder of the products were oxygenated organic compounds: maleic acid (45.6%), hydroquinone (2.7%), resorcinol (15.7%), catechol (16%) and PL (16.6%).…”

Section: Adsorption On the Catalystmentioning

confidence: 99%

Achieving selectivity in TiO2-based photocatalysis

Lazar

Daoud

2013

RSC Adv.

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Nanocrystalline titanium dioxide (NTO) mediated photocatalysis is a powerful tool for the total mineralization of a wide range of organic compounds caused by the in situ generation of hydroxyl radicals upon ultraviolet/visible light irradiation. NTO is well known for its non-selective catalysis, especially in aqueous media. However, making NTO into a selective photocatalyst enables selective degradation of compounds as well as selective formation of valuable organic products. Both selective degradation and selective formation using NTO are based on the same principles of photocatalysis. Selectivity in degradation is achieved in the attraction, adsorption, and mineralization stages of photocatalysis whereas desorption of the oxygenated products, moderate crystallinity of NTO and doping are responsible for selective formation. Recent reports on NTO selective photocatalysis are reviewed in this article according to the chemistry used to achieve selectivity.

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Product desorption limitations in selective photocatalytic oxidation

Cited by 20 publications

References 25 publications

Qualitative Approaches Towards Useful Photocatalytic Materials

Qualitative Approaches Towards Useful Photocatalytic Materials

Cl₂ Production by Photocatalytic Oxidation of HCl over TiO₂

Achieving selectivity in TiO2-based photocatalysis

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Product desorption limitations in selective photocatalytic oxidation

Cited by 20 publications

References 25 publications

Qualitative Approaches Towards Useful Photocatalytic Materials

Qualitative Approaches Towards Useful Photocatalytic Materials

Cl2 Production by Photocatalytic Oxidation of HCl over TiO2

Achieving selectivity in TiO2-based photocatalysis

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Product

Resources

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Cl₂ Production by Photocatalytic Oxidation of HCl over TiO₂