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The future of the precious metals is shiny and resistant. Although expensive and potentially replaceable by transition metal catalysts, precious metal implementation in research and industry shows potential. These metals catalyze oxidation and hydrogenation due to their dissociative behavior toward hydrogen and oxygen, dehydrogenation, isomerization, and aromatization, etc. The precious metal catalysts, especially platinum-based catalysts, are involved in a variety of industrial processes. Examples include Pt–Rh gauze for nitric acid production, the Pt/Al2O3 catalyst for cyclohexane and propylene production, and Pd/Al2O3 catalysts for petrochemical hydropurification reactions, etc. A quick search of the number of published articles in the last five years containing a combination of corresponding “metals” (Pt, Pd, Ru, Rh and Au) and “catalysts” as keywords indicates the importance of the Pt catalysts, but also the continuous increase in the contribution of Pd and Au. This Special Issue reveals the importance of precious metals in catalysis and focuses on mono- and bi-metallic formulations of any supported precious metals and their promotional catalytic effect of other transition metals. The application of precious metals in diverse reactions, either homogeneous or heterogeneous, and studies of the preparation, characterization, and applications of the supported precious metal catalysts, are presented.

sustainable ammonia synthesis --- Pt3Sn alloy --- alkenols --- n/a --- PtSn alloy --- propane dehydrogenation --- chelate --- photodegradation --- gold nanoparticles --- photochemical --- alkynols --- triple bond electron charge --- palladium catalyst --- Pt/Al2O3 --- 2-methyl-3-butyn-2-ol --- hydrogen storage --- X-ray crystallography --- ruthenium --- platinum dispersion --- gold catalysts --- reduction temperature --- DOC --- palladium --- renewable hydrogen --- 1-propanol --- 4-hydroxyproline --- glycerol --- 2-?-benzylproline --- proline --- hydrogen bonding --- oxidative coupling --- glucose oxidation --- stabilizing agent --- titania --- 4-fluoroproline --- turnover frequency --- porous carbons --- Pt–Sn/Al2O3 --- P25@Pd --- catalyst synthesis --- 2-propanol --- amino acid --- azetidine --- precious metals --- clay --- gas phase hydrogenation --- CNTs --- 3-butyn-2-ol --- Pd/Al2O3 --- heterogeneous enantioselective hydrogenation --- XPS --- microwave --- caesium --- perovskite --- CO oxidation --- Au–TiO2 --- dodecahydro-N-ethylcarbazole --- phenol photo-degradation --- pipecolinic acid --- 3-butyn-1-ol --- acetophenone --- drying --- palladium catalysts --- N-methylproline --- dehydrogenation --- PVA --- aging --- hydrodechlorination --- hydrogenolysis --- dispersion --- direct reduction --- core-shell --- Pt-Sn/Al2O3 --- Au-TiO2

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Water pollution from biorefractory pollutants and emerging contaminants is still a very relevant problem worldwide. Examples of these pollutants include disinfection by-products, pharmaceutical and personal care products, persistent organic chemicals, as well as their degradation products. The occurrence of these contaminants in water has raised increasing concern due to their accumulation and persistence in the environment and the threat they pose to the ecological system and human health. In this Special Issue, papers regarding the advancements in materials and processes for use in the electro- and photoelectrochemical removal of different pollutants from water are collected. The synthesis, characterization and application of materials for use in electrochemical or photoelectrochemical techniques are presented, as well as studies concerning catalytic processes and reaction kinetics.

Technology: general issues --- Chemical engineering --- Au-TiO2 --- antibiotics --- emergent contaminants --- nanocatalyst --- photocatalysis --- GFN-xTB --- ibuprofen --- advanced oxidation process --- TiO2 --- active glass --- heterojunction --- charge separation --- chlorpyrifos --- photodegradation --- nanoparticles --- gold --- cyclodextrins --- perfluorooctanoic acid --- emerging contaminant --- defluorination --- platinum --- electro-oxidation --- strontium carbonate (SrCO3) --- solvothermal method --- visible light --- n/a --- diethyl phthalate --- photoelectrochemical degradation --- persistent organic pollutants --- chloride ions --- TiO2 nanotubes --- g-C3N4 --- response surface methodology --- wastewater treatment --- phenol --- crude oil --- sonolysis --- sonophotocatalysis --- FT-ICR/MS --- Kendrick plot --- van Krevelen diagram --- water --- pollution --- remediation

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Novel Specialty Optical Fibers and Applications focuses on the latest developments in specialty fiber technology and its applications. The aim of this reprint is to provide an overview of specialty optical fibers in terms of their technological developments and applications. Contributions include:1. Specialty fibers composed of special materials for new functionalities and applications in new spectral windows.2. Hollow-core fiber-based applications.3. Functionalized fibers.4. Structurally engineered fibers.5. Specialty fibers for distributed fiber sensors.6. Specialty fibers for communications.

Technology: general issues --- History of engineering & technology --- optical amplifiers --- doped fiber amplifiers --- near-infrared --- molecular gas spectroscopy --- photothermal spectroscopy --- heterodyne detection --- specialty fiber --- anti-resonant effect --- hollow structure --- sensing applications --- orbital angular momentum --- optical fiber --- fiber mode crosstalk --- vortex mode generator --- fiber optics --- plasmonic gratings --- nanodot --- light collection --- hollow-core fibers --- anti-resonant hollow-core fibers --- tapered fibers --- fiber gas lasers --- fiber end cap --- SiO2-Au-TiO2 heterostructure --- long-range surface plasmon resonance --- microstructured optical fiber --- fiber sensor --- photonic crystal fibers --- fiber lasers --- stimulated Raman scattering --- gas Raman lasers --- specialty fibers --- Brillouin optical time domain analysis --- BOTDA --- distributed fiber sensor --- photonic crystal fiber --- strain and temperature sensing --- liquid crystal --- dual-core photonic crystal fiber --- polarization beam splitter --- extinction ratio --- polarization filter --- surface plasmon resonance --- gold-coated --- crosstalk --- mid-infrared (mid-IR) --- chalcogenide glasses (ChGs) --- optical microfibers (MFs) --- supercontinuum (SC) --- molecular sensing --- Raman spectroscopy --- capillary-based hollow core fibers --- hollow core photonic crystal fiber --- detection --- distributed acoustic sensing --- DAS --- scattering enhancement fiber --- fiber-optic sensors --- few-mode fiber --- microfiber --- Mach-Zehnder interferometer --- critical wavelength --- multicore fiber --- fiber Bragg grating --- long period grating --- fiber grating sensors --- optical amplifiers --- doped fiber amplifiers --- near-infrared --- molecular gas spectroscopy --- photothermal spectroscopy --- heterodyne detection --- specialty fiber --- anti-resonant effect --- hollow structure --- sensing applications --- orbital angular momentum --- optical fiber --- fiber mode crosstalk --- vortex mode generator --- fiber optics --- plasmonic gratings --- nanodot --- light collection --- hollow-core fibers --- anti-resonant hollow-core fibers --- tapered fibers --- fiber gas lasers --- fiber end cap --- SiO2-Au-TiO2 heterostructure --- long-range surface plasmon resonance --- microstructured optical fiber --- fiber sensor --- photonic crystal fibers --- fiber lasers --- stimulated Raman scattering --- gas Raman lasers --- specialty fibers --- Brillouin optical time domain analysis --- BOTDA --- distributed fiber sensor --- photonic crystal fiber --- strain and temperature sensing --- liquid crystal --- dual-core photonic crystal fiber --- polarization beam splitter --- extinction ratio --- polarization filter --- surface plasmon resonance --- gold-coated --- crosstalk --- mid-infrared (mid-IR) --- chalcogenide glasses (ChGs) --- optical microfibers (MFs) --- supercontinuum (SC) --- molecular sensing --- Raman spectroscopy --- capillary-based hollow core fibers --- hollow core photonic crystal fiber --- detection --- distributed acoustic sensing --- DAS --- scattering enhancement fiber --- fiber-optic sensors --- few-mode fiber --- microfiber --- Mach-Zehnder interferometer --- critical wavelength --- multicore fiber --- fiber Bragg grating --- long period grating --- fiber grating sensors

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Novel Specialty Optical Fibers and Applications focuses on the latest developments in specialty fiber technology and its applications. The aim of this reprint is to provide an overview of specialty optical fibers in terms of their technological developments and applications. Contributions include:1. Specialty fibers composed of special materials for new functionalities and applications in new spectral windows.2. Hollow-core fiber-based applications.3. Functionalized fibers.4. Structurally engineered fibers.5. Specialty fibers for distributed fiber sensors.6. Specialty fibers for communications.

optical amplifiers --- doped fiber amplifiers --- near-infrared --- molecular gas spectroscopy --- photothermal spectroscopy --- heterodyne detection --- specialty fiber --- anti-resonant effect --- hollow structure --- sensing applications --- orbital angular momentum --- optical fiber --- fiber mode crosstalk --- vortex mode generator --- fiber optics --- plasmonic gratings --- nanodot --- light collection --- hollow-core fibers --- anti-resonant hollow-core fibers --- tapered fibers --- fiber gas lasers --- fiber end cap --- SiO2-Au-TiO2 heterostructure --- long-range surface plasmon resonance --- microstructured optical fiber --- fiber sensor --- photonic crystal fibers --- fiber lasers --- stimulated Raman scattering --- gas Raman lasers --- specialty fibers --- Brillouin optical time domain analysis --- BOTDA --- distributed fiber sensor --- photonic crystal fiber --- strain and temperature sensing --- liquid crystal --- dual-core photonic crystal fiber --- polarization beam splitter --- extinction ratio --- polarization filter --- surface plasmon resonance --- gold-coated --- crosstalk --- mid-infrared (mid-IR) --- chalcogenide glasses (ChGs) --- optical microfibers (MFs) --- supercontinuum (SC) --- molecular sensing --- Raman spectroscopy --- capillary-based hollow core fibers --- hollow core photonic crystal fiber --- detection --- distributed acoustic sensing --- DAS --- scattering enhancement fiber --- fiber-optic sensors --- few-mode fiber --- microfiber --- Mach–Zehnder interferometer --- critical wavelength --- multicore fiber --- fiber Bragg grating --- long period grating --- fiber grating sensors --- n/a --- Mach-Zehnder interferometer