Photoreforming of Lignocellulose into H<sub>2</sub> Using Nanoengineered Carbon Nitride under Benign Conditions

Kasap, Hatice; Achilleos, Demetra S.; Huang, Ailun; Reisner, Erwin

doi:10.1021/jacs.8b07853

Cited by 179 publications

(170 citation statements)

References 46 publications

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“…Different examples also have been reported, but avoiding the use of a sacrificial electron donor remains a key issue. In this context, few demonstrations that combine H 2 production with oxidation of organic compounds, including lignocelluloses, have been reported recently . The gap between heterogeneous and homogeneous catalysis obviously blurs when molecular catalysts are immobilized on the surface of semiconductors.…”

Section: Future Perspectivesmentioning

confidence: 99%

Comprehensive review and future perspectives on the photocatalytic hydrogen production

Corredor

Rivero

Rangel

et al. 2019

J of Chemical Tech & Biotech

172

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Hydrogen represents a renewable energy alternative that may positively contribute to get over the global energy crisis while at the same time reducing its environmental burden. Overcoming the challenge of reaching this potential could be helped by careful choice of hydrogen (H2) sources. Photocatalytic generation of H2, although a minor alternative, appears to be a very good option at the time that liquid wastes are being degraded; therefore, this approach has given rise to an increasing number of interesting studies. Here, we aim to provide an integrated overview of the different photocatalytic, heterogeneous, homogeneous and hybrid systems. First, we categorize the units and mechanisms that take part in the photocatalytic process, and secondly we analyze their role and draw comparative conclusions. Thus, we analyze the role of (i) the electron source to carry out proton reduction, (ii) the proton source, which can be free protons in the medium or a proton donor compound, (iii) the catalyst nature and concentration, and (iv) the photosensitizer nature and concentration. We also provide an analysis of the influence of the solvent, especially in homogenous systems as well as the influence of pH. We provide a comparison of the photocatalytic performance, highlighting the advantages and disadvantages, of different systems. Thus, this review is, on the one hand, an update on the state of the art of photocatalytic generation of H2 from a full perspective that integrates homogeneous, heterogeneous and hybrid systems, and, on the other, a source of useful information for future research. © 2019 Society of Chemical Industry

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Section: Future Perspectivesmentioning

confidence: 99%

Comprehensive review and future perspectives on the photocatalytic hydrogen production

Corredor

Rivero

Rangel

et al. 2019

J of Chemical Tech & Biotech

172

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“…Catalysts 2019, 9, x FOR PEER REVIEW 2 of 17 Direct photoreforming of lignocelluloses is challenging due to their inertness and insolubility, requiring highly basic media [10][11][12][13][14][15]. Some efforts have been also dedicated to designing photocatalytic systems able to hydrolyze lignocelluloses and photoreform the resulting saccharides in a cascade fashion [16][17][18][19][20], or to combining mechanochemistry and photocatalysis [21].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Photocatalytic Hydrogen Production from Biomass or Wastewaters Depending on the Metal Co-Catalyst and Its Deposition Method on TiO2

Imizcoz

Puga

2019

Catalysts

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A systematic study on the solar photocatalytic hydrogen production (photoreforming) performance of M/TiO2 (M = Au, Ag, Cu or Pt) using glucose as a model substrate, and further extended to lignocellulose hydrolysates and wastewaters, is herein presented. Three metal (M) co-catalyst loading methods were tested. Variation of the type of metal results in significantly dissimilar H2 production rates, albeit the loading method exerts an even greater effect in most cases. Deposition-precipitation (followed by hydrogenation) or photodeposition provided better results than classical impregnation (followed by calcination). Interestingly, copper as a co-catalyst performed satisfactorily as compared to Au, and slightly below Pt, thus representing a realistic inexpensive alternative to noble metals. Hydrolysates of either α-cellulose or rice husks, obtained under mild conditions (short thermal cycles at 160 °C), were rich in saccharides and thus suitable as feedstocks. Nonetheless, the presence of inhibiting byproducts hindered H2 production. A novel photocatalytic UV pre-treatment method was successful to initially remove the most recalcitrant portion of these minor products along with H2 production (17 µmol gcat−1 h−1 on Cu/TiO2). After a short UV step, simulated sunlight photoreforming was orders of magnitude more efficient than without the pre-treatment. Hydrogen production was also directly tested on two different wastewater streams, that is, a municipal influent and samples from operations in a fruit juice producing plant, with remarkable results obtained for the latter (up to 115 µmol gcat−1 h−1 using Au/TiO2).

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“…Biomass, with global production of 170 billion metric tons per year, store the solar energy in the chemical bonds via plants biological photosynthesis, but cannot be directly used as a liquid fuel 4,6 . The conversion of biomass into fuels have been widely studied 4,[7][8][9][10] . The conversion of biomass into bio-methanol, called as liquid sunshine 1 , efficiently connects the biorefinery processes and the existing petrochemical-fuel chains.…”

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confidence: 99%

Photo splitting of bio-polyols and sugars to methanol and syngas

et al. 2020

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Methanol is a clean liquid energy carrier of sunshine and a key platform chemical for the synthesis of olefins and aromatics. Herein, we report the conversion of biomass-derived polyols and sugars into methanol and syngas (CO+H 2) via UV light irradiation under room temperature, and the bio-syngas can be further used for the synthesis of methanol. The cellulose and even raw wood sawdust could be converted into methanol or syngas after hydrogenolysis or hydrolysis pretreatment. We find Cu dispersed on titanium oxide nanorod (TNR) rich in defects is effective for the selective C−C bond cleavage to methanol. Methanol is obtained from glycerol with a co-production of H 2. A syngas with CO selectivity up to 90% in the gas phase is obtained via controlling the energy band structure of Cu/TNR.

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Photoreforming of Lignocellulose into H₂ Using Nanoengineered Carbon Nitride under Benign Conditions

Cited by 179 publications

References 46 publications

Comprehensive review and future perspectives on the photocatalytic hydrogen production

Comprehensive review and future perspectives on the photocatalytic hydrogen production

Assessment of Photocatalytic Hydrogen Production from Biomass or Wastewaters Depending on the Metal Co-Catalyst and Its Deposition Method on TiO2

Photo splitting of bio-polyols and sugars to methanol and syngas

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Photoreforming of Lignocellulose into H2 Using Nanoengineered Carbon Nitride under Benign Conditions

Cited by 179 publications

References 46 publications

Comprehensive review and future perspectives on the photocatalytic hydrogen production

Comprehensive review and future perspectives on the photocatalytic hydrogen production

Assessment of Photocatalytic Hydrogen Production from Biomass or Wastewaters Depending on the Metal Co-Catalyst and Its Deposition Method on TiO2

Photo splitting of bio-polyols and sugars to methanol and syngas

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Photoreforming of Lignocellulose into H₂ Using Nanoengineered Carbon Nitride under Benign Conditions