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This reprint of “Metal Nanoparticles as Catalysts for Green Applications” collects recent works of researchers on metal nanoparticles as catalysts for green applications. All works deal with designing chemical products and processes that generate and use less (or preferably no) hazardous substances by applying the principles of green chemistry. Despite the interdisciplinary nature of the different applications involved, ranging from pure chemistry to material science, from chemical engineering to physical chemistry, in this reprint there are common characteristics connecting the areas together, and they can be described by two words: sustainability and catalysis.

Technology: general issues --- acetylene hydrogenation --- kinetic model --- catalyst decay --- process modeling --- Al2O3 --- bimetallic catalyst --- syngas --- methane --- partial oxidation --- ZrO2 --- metal-organic framework --- bimetallic metal-organic frameworks --- decarboxylative amidation --- polymeric catalytic membranes --- electrospinning --- HMF oxidation --- glucose --- biochemicals --- MCM-41 --- bimetallic --- reactivity --- product selectivity --- neem --- mint --- nZVI synthesis --- lead --- nickel --- soil remediation --- ethanol steam reforming --- Ni/CeO2 --- microemulsion --- coke resistance --- lanthanum doping --- hydrodeoxygenation --- guaiacol --- regeneration --- catalyst deactivation --- acetylene hydrogenation --- kinetic model --- catalyst decay --- process modeling --- Al2O3 --- bimetallic catalyst --- syngas --- methane --- partial oxidation --- ZrO2 --- metal-organic framework --- bimetallic metal-organic frameworks --- decarboxylative amidation --- polymeric catalytic membranes --- electrospinning --- HMF oxidation --- glucose --- biochemicals --- MCM-41 --- bimetallic --- reactivity --- product selectivity --- neem --- mint --- nZVI synthesis --- lead --- nickel --- soil remediation --- ethanol steam reforming --- Ni/CeO2 --- microemulsion --- coke resistance --- lanthanum doping --- hydrodeoxygenation --- guaiacol --- regeneration --- catalyst deactivation

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This reprint of “Metal Nanoparticles as Catalysts for Green Applications” collects recent works of researchers on metal nanoparticles as catalysts for green applications. All works deal with designing chemical products and processes that generate and use less (or preferably no) hazardous substances by applying the principles of green chemistry. Despite the interdisciplinary nature of the different applications involved, ranging from pure chemistry to material science, from chemical engineering to physical chemistry, in this reprint there are common characteristics connecting the areas together, and they can be described by two words: sustainability and catalysis.

acetylene hydrogenation --- kinetic model --- catalyst decay --- process modeling --- Al2O3 --- bimetallic catalyst --- syngas --- methane --- partial oxidation --- ZrO2 --- metal–organic framework --- bimetallic metal–organic frameworks --- decarboxylative amidation --- polymeric catalytic membranes --- electrospinning --- HMF oxidation --- glucose --- biochemicals --- MCM-41 --- bimetallic --- reactivity --- product selectivity --- neem --- mint --- nZVI synthesis --- lead --- nickel --- soil remediation --- ethanol steam reforming --- Ni/CeO2 --- microemulsion --- coke resistance --- lanthanum doping --- hydrodeoxygenation --- guaiacol --- regeneration --- catalyst deactivation --- n/a --- metal-organic framework --- bimetallic metal-organic frameworks

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Layered double hydroxides (LDHs), also known as two-dimensional anionic clays, as well as the derived materials, including hybrids, nanocomposites, mixed oxides, and supported metals, have been highlighted as outstanding heterogeneous catalysts with unlimited applications in various processes involving both acid–base (addition, alkylation, acylation, decarboxylation, etc.) and redox (oxidation, reduction, dehydrogenation, etc.) mechanisms. This is mainly due to their flexibility in chemical composition, allowing the fine tuning of the nature of the active sites and the control of the balance between them. Additionally, LDHs display a large anion exchange capacity and the possibility to modify their interlayer space, constraining the size and type of reactants entering in the interlamellar space. Furthermore, their easy and economic synthesis, with high levels of purity and efficiency, at both the laboratory and industrial scales, make LDHs and their derived materials excellent solid catalysts. This Special Issue collects original research papers, reviews, and commentaries focused on the catalytic applications of these remarkable materials.

layered double hydroxides (LDH) --- polyoxometalates (POM) --- catalytic materials --- Michael addition --- cobalt-based LDHs --- ultrasonic irradiation --- synergistic effect --- photocatalysis --- nitrophenol degradation --- Zn,Al-hydrotalcite --- ZnO dispersed on alumina --- reusability --- layered double hydroxide --- LDH --- catalytic oxidation --- ethanol --- toluene --- VOC --- photocatalysts --- Cu electrodes --- diazo dyes --- electrocatalysts --- layer double hydroxides --- photoelectrochemical degradation --- hydrotalcites --- mixed oxides --- aldol condensation --- basic catalysts --- exfoliation --- nanosheets --- oxidation --- layered double hydroxides --- base catalysts --- epoxide --- formaldehyde --- oxidation removal --- BiOCl --- manganese --- biodiesel --- transesterification --- hydrothermal --- nickel --- aluminum --- solid base --- structured catalyst --- ethanol steam reforming --- aluminum lathe waste strips --- Ni nanoparticle --- mechano-chemical/co-precipitation synthesis --- organic alkalis (tetramethylammonium hydroxide) --- memory effect --- Claisen-Schmidt condensation --- self-cyclohexanone condensation --- n/a

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Layered double hydroxides (LDHs), also known as two-dimensional anionic clays, as well as the derived materials, including hybrids, nanocomposites, mixed oxides, and supported metals, have been highlighted as outstanding heterogeneous catalysts with unlimited applications in various processes involving both acid–base (addition, alkylation, acylation, decarboxylation, etc.) and redox (oxidation, reduction, dehydrogenation, etc.) mechanisms. This is mainly due to their flexibility in chemical composition, allowing the fine tuning of the nature of the active sites and the control of the balance between them. Additionally, LDHs display a large anion exchange capacity and the possibility to modify their interlayer space, constraining the size and type of reactants entering in the interlamellar space. Furthermore, their easy and economic synthesis, with high levels of purity and efficiency, at both the laboratory and industrial scales, make LDHs and their derived materials excellent solid catalysts. This Special Issue collects original research papers, reviews, and commentaries focused on the catalytic applications of these remarkable materials.

Research & information: general --- Chemistry --- layered double hydroxides (LDH) --- polyoxometalates (POM) --- catalytic materials --- Michael addition --- cobalt-based LDHs --- ultrasonic irradiation --- synergistic effect --- photocatalysis --- nitrophenol degradation --- Zn,Al-hydrotalcite --- ZnO dispersed on alumina --- reusability --- layered double hydroxide --- LDH --- catalytic oxidation --- ethanol --- toluene --- VOC --- photocatalysts --- Cu electrodes --- diazo dyes --- electrocatalysts --- layer double hydroxides --- photoelectrochemical degradation --- hydrotalcites --- mixed oxides --- aldol condensation --- basic catalysts --- exfoliation --- nanosheets --- oxidation --- layered double hydroxides --- base catalysts --- epoxide --- formaldehyde --- oxidation removal --- BiOCl --- manganese --- biodiesel --- transesterification --- hydrothermal --- nickel --- aluminum --- solid base --- structured catalyst --- ethanol steam reforming --- aluminum lathe waste strips --- Ni nanoparticle --- mechano-chemical/co-precipitation synthesis --- organic alkalis (tetramethylammonium hydroxide) --- memory effect --- Claisen-Schmidt condensation --- self-cyclohexanone condensation --- layered double hydroxides (LDH) --- polyoxometalates (POM) --- catalytic materials --- Michael addition --- cobalt-based LDHs --- ultrasonic irradiation --- synergistic effect --- photocatalysis --- nitrophenol degradation --- Zn,Al-hydrotalcite --- ZnO dispersed on alumina --- reusability --- layered double hydroxide --- LDH --- catalytic oxidation --- ethanol --- toluene --- VOC --- photocatalysts --- Cu electrodes --- diazo dyes --- electrocatalysts --- layer double hydroxides --- photoelectrochemical degradation --- hydrotalcites --- mixed oxides --- aldol condensation --- basic catalysts --- exfoliation --- nanosheets --- oxidation --- layered double hydroxides --- base catalysts --- epoxide --- formaldehyde --- oxidation removal --- BiOCl --- manganese --- biodiesel --- transesterification --- hydrothermal --- nickel --- aluminum --- solid base --- structured catalyst --- ethanol steam reforming --- aluminum lathe waste strips --- Ni nanoparticle --- mechano-chemical/co-precipitation synthesis --- organic alkalis (tetramethylammonium hydroxide) --- memory effect --- Claisen-Schmidt condensation --- self-cyclohexanone condensation

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Hydrogen has been an important feedstock for various industries, and its global market is already valued at hundreds of billions of dollars per year. It is also playing additional roles as a clean alternative energy carrier for power generation and as a crucial feedstock in the bioeconomy. This Special Issue “Hydrogen Production Technologies” highlights different thermochemical, electrochemical, and biological technologies such as high- and low-temperature electrolyzers, microchannel reactors, sorption-enhanced reactors, multi-tubular solar reactors, and anaerobic digestors. It also covers other aspects ranging from reactor design, hydrogen storage, and process analysis of different alternatives.

History of engineering & technology --- algae --- anaerobic digestion --- biogas --- biohydrogen --- energy assessment --- kinetic models --- microwave --- nanoparticles --- pretreatment --- solar reactor --- hydrogen production --- solar receiver --- thermal energy --- computational fluid dynamics --- CFD --- model --- titanium nitride --- stainless steel --- alkaline electrolysis --- energy storage --- hydrogen energy --- solid-state hydrogen storage --- unitized regenerative fuel cell --- multi- walled carbon nanotube --- proton battery --- pyrolytic oil hydro-processing --- process modeling --- syngas --- gasification --- sorption-enhanced water–gas shift --- multi-functional material --- hydrogen production processes --- economic viability --- environmental efficiency --- sustainable energy --- multi-criteria analysis --- thermochemical cycles --- micro-channel reactor --- ceria --- ceria-zirconia --- water splitting --- oxygen carrier --- solid oxide electrolysis cells --- sintering additive --- CuO --- steam electrolysis --- compact reactor --- ethanol steam reforming --- water gas shift --- n/a --- sorption-enhanced water-gas shift