Photoactivity of zeolite-supported cadmium sulfide: hydrogen evolution in the presence of sacrificial donors

Abstract

therefore may not be able to abstract and accommodate the hydride from the carbonyl carbon. In this case, the eliminated hydrides from the carbonyl carbon atoms may attack adsorbed formaldehyde molecules to form surface methoxides. ConclusionsFormaldehyde reacts on basic sites on MgO surfaces to form both CH,O(ad) and HCOO(ad) species via the Cannizzaro reaction. This reaction may be suppressed by preadsorption of Bransted acids such as methanol and water. The observation of the Cannizzaro reaction on clean oxide surfaces, including both thin oxide films on Mg(0001) and the MgO(100) surface, suggests that this reaction can occur on basic MgO sites of high coordination number.

Preparation of Ru-loaded CdS/Al-HMS nanocomposites and production of hydrogen by photocatalytic degradation of formic acid

“…It should be considered that the trait of wormhole-like structure provides the uniform dispersions for the CdS nanoparticles inside the channels of Al-HMS, and also the aluminum silicate framework serves as matrix and stabilizes the embedded CdS nanoparticles under ambient conditions. It was reported that the high H 2 evolution rate under ultraviolet irradiation was attributed to the smaller particles of the CdS clusters encapsulated in the cage of type A and LZ-Y52 zeolites [5]. The 0.07Ru/CdS/Al-HMS sample exhibits the highest H 2 evolution activity at a rate of 3.7 mL h À1 with the apparent quantum yield of 1.2% at 420 nm in Fig.…”

“…It was reported that noble metal supported on the TiO 2 as photocatalytic material degraded alcohol, formic acid, formaldehyde and oxalic acid to produce hydrogen under ultraviolet and xenon lamp irradiations [1][2][3]. To enhance the efficiency of hydrogen production and overcome the photocorrosion of bulk CdS, some papers reported the embedded CdS nanoparticles inside TiO 2 gel for generation of hydrogen from an EDTA aqueous solution [4], grown CdS particles inside zeolite-A and LZ-Y52 cavities for production of hydrogen from an aqueous solution containing Na 2 S/ Na 2 SO 3 electron donor [5] and assembled CdS within titanosilicate zeolite ETS-4 as the photocatalyst for H 2 evolution in the presence of Na 2 S/Na 2 SO 3 /NaOH sacrificial donors under visible light irradiation [6].…”

Synthesis of Cr2O3/TNTs nanocomposite and its photocatalytic hydrogen generation under visible light irradiation

“…(5) and (6) [27][28][29]. Since sacrificial reagent (electron donor) is consumed in photocatalytic reaction, continual addition of sacrificial reagent is necessary to sustain hydrogen production.…”

Reaction of Fully Indium-Exchanged Zeolite A with Hydrogen Sulfide. Crystal Structures of Indium-Exchanged Zeolite A Containing In2S, InSH, Sorbed H2S, and (In5)7+

“…Some of these, such as the semiconductors, are photoactive species. 1 Zeolites can stabilize these small clusters under ambient conditions and require them to be both uniform and spatially oriented. The wide range of zeolite frameworks available allow the introduction or growth of subnanometer particles with various sizes and orientation patterns.…”

“…The wide range of zeolite frameworks available allow the introduction or growth of subnanometer particles with various sizes and orientation patterns. 1 Elemental sulfur and various sulfur compounds have been introduced into nanoporous materials, including zeolites, by material scientists. ("Nanoporous" indicates that the channels and cavities are of the order of 10 -9 m in diameter; unfortunately IUPAC has approved the word "microporous" for this.)…”