Unraveling the NH-SCR-DeNO Mechanism of Cu-SSZ-13 Variants by Spectroscopic and Transient Techniques.

Commercial SSZ-13 zeolite with different n(Si)/n(Al) ratios and from different suppliers were subjected to a post-synthetic treatment in order to create mesopores of up to 15 nm. Furthermore, the materials were modified with copper ions and thoroughly physico-chemically characterized. The modified textural properties varied the nature of copper species, and thus, activity in the selective catalytic reduction of NO with ammonia (NH-SCR-DeNO).

Exploring Defect-Engineered Metal-Organic Frameworks with 1,2,4-Triazolyl Isophthalate and Benzoate Linkers.

Synthesis and characterization of DEMOFs (defect-engineered metal-organic frameworks) with coordinatively unsaturated sites (CUSs) for gas adsorption, catalysis, and separation are reported. We use the mixed-linker approach to introduce defects in Cu-paddle wheel units of MOFs [Cu(Me-trz-ia)] by replacing up to 7% of the 3-methyl-triazolyl isophthalate linker (L) with the "defective linker" 3-methyl-triazolyl m-benzoate (L), causing uncoordinated equatorial sites. PXRD of DEMOFs shows broadened reflections; IR and Raman analysis demonstrates only marginal changes as compared to the regular MOF (ReMOF, without a defective linker).

OSDA-Free Seeded Cu-Containing ZSM-5 Applied for NH-SCR-DeNO.

A series of ZSM-5 zeolite materials were synthesized from organic structure-directing agent (OSDA)-free seeded systems, including nanosized silicalite-1 (12 wt % water suspension or in powder form) or nanosized ZSM-5 (powder form of ZSM-5 prepared at 100 or 170 °C). The physicochemical characterization revealed aggregated species in the samples based on silicalite-1. Contrarily, the catalysts based on ZSM-5 seeds revealed isolated copper species, and thus, higher NO conversion during the selective catalytic reduction of NO with NH (NH-SCR-DeNO) was observed.

Selective adsorption of dihydrogen isotopes on DUT-8 (Ni,Co) monitored by electron paramagnetic resonance.

continuous wave electron paramagnetic resonance investigation has been proven as a powerful method by employing paramagnetic Ni-Co pairs as spin probes to follow the isotope-selective gate opening phenomenon on the DUT-8(Ni Co) framework. This method is very sensitive to detect the phase transition from the closed pore to the open pore phase in response to D adsorption in the framework, while no phase transformation has been observed during H gas adsorption. More interestingly, it is also able to sense local structural changes around the spin probe during the desorption of D gas.

Increasing CO concentration impact upon nutrient absorption and removal efficiency of supra intensive shrimp pond wastewater by marine microalgae .

The objective of this study was to investigate the effect of increasing CO concentration on the growth and the capability of . in removal of nitrate, ammonium and phosphate from shrimp pond wastewater (SPWW). The factorial experimental design was used with the treatment of SPWW percentage in culture medium, namely: 100% SPWW, 75% SPWW + 25% Sea Water (SW) and 75% SW + 25% SPWW coupled with three CO concentration treatments: 390 ppm, 550 ppm and 1000 ppm using CO system.

Small tropical islands with dense human population: differences in water quality of near-shore waters are associated with distinct bacterial communities.

Water quality deterioration caused by an enrichment in inorganic and organic matter due to anthropogenic inputs is one of the major local threats to coral reefs in Indonesia. However, even though bacteria are important mediators in coral reef ecosystems, little is known about the response of individual taxa and whole bacterial communities to these anthropogenic inputs. The present study is the first to investigate how bacterial community composition responds to small-scale changes in water quality in several coral reef habitats of the Spermonde Archipelago including the water column, particles, and back-reef sediments, on a densely populated and an uninhabited island.

Bacterial Community Composition and Potential Driving Factors in Different Reef Habitats of the Spermonde Archipelago, Indonesia.

Coastal eutrophication is a key driver of shifts in bacterial communities on coral reefs. With fringing and patch reefs at varying distances from the coast the Spermonde Archipelago in southern Sulawesi, Indonesia offers ideal conditions to study the effects of coastal eutrophication along a spatially defined gradient. The present study investigated bacterial community composition of three coral reef habitats: the water column, sediments, and mucus of the hard coral genus , along that cross-shelf environmental and water quality gradient.