Recent advances in liquid-phase chemical hydrogen storage

Serious environmental problems, growing demand for energy, and the pursuit of environmental‐friendly, sustainable, and effective energy technologies to store and transform clean energy have all drawn great attention recently. As a part of the special issue “Energy Research in National Institute of Advanced Industrial Science and Technology (AIST)” this review systematically summarizes the research progress of metal–organic framework (MOF) composites and derivatives in energy applications, including catalytic CO oxidation, liquid‐phase chemical hydrogen storage, and electrochemical energy storage and conversion. Furthermore, the correlation between MOF‐based structures, synthetic strategies, and their corresponding performances is carefully discussed. The further scope and opportunities, expected improvements and challenges are also discussed. This review will not only benefit development of more feasible protocols to fabricate nanostructures for energy systems but also stimulate further interest in MOF composites and derivatives, for energy applications.

Metal–Organic Frameworks for Energy

Production of Liquid Solar Fuels and Their Use in Fuel Cells

Novel NiPt/graphitic carbon nitride nanosheets (g-C3N4 NSs) have been successfully constructed through a simple and facile wet chemical reduction approach. Interestingly, benefiting from the unique structure of g-C3N4 NSs and their strong interaction with NiPt, Ni0.6Pt0.4/g-C3N4 NSs demonstrate outstanding catalytic activity toward hydrogen generation from hydrous hydrazine, giving 100% H2 selectivity with a high turnover frequency (TOF) value of 2194 h−1 at 323 K.

Novel NiPt alloy nanoparticle decorated 2D layered g-C3N4 nanosheets: a highly efficient catalyst for hydrogen generation from hydrous hydrazine

Interest in chemical hydrogen storage has increased, because the supply of fossil fuels are limited and the harmful effects of burning fossil fuels on the environment have become a focus of public concern. Hydrogen, as one of the energy carriers, is useful for the sustainable development. However, it is widely known that controlled storage and release of hydrogen are the biggest barriers in large-scale application of hydrogen energy. Ammonia borane (NH3BH3, AB) is deemed as one of the most promising hydrogen storage candidates on account of its high hydrogen to mass ratio and environmental benignity. Development of efficient catalysts to further improve the properties of chemical kinetics in the dehydrogenation of AB under appropriate conditions is of importance for the practical application of this system. In previous studies, a variety of noble metal catalysts and their supported metal catalysts (Pt, Pd, Au, Rh, etc.) have presented great properties in decomposing the chemical hydride to generate hydrogen, thus, promoting their application in dehydrogenation of AB is urgent. We analyzed the hydrolysis of AB from the mechanism of hydrogen release reaction to understand more deeply. Based on these characteristics, we aimed to summarize recent advances in the development of noble metal catalysts, which had excellent activity and stability for AB dehydrogenation, with prospect towards realization of efficient noble metal catalysts.

Recent Advances in Noble Metal Catalysts for Hydrogen Production from Ammonia Borane

The invention discloses a method for formate dehydrogenation under catalysis of a supported Ag-Pd/C3N4 nano-catalyst and belongs to the technical fields of chemistry and chemical engineering. The well-prepared supported Ag-Pd/C3N4 nano-catalyst is put in a reactor, the reactor is put in an oil bath and heated to a certain temperature, a mixed solution of formic acid and sodium formate is added to the reactor for a reaction, and generated hydrogen is collected with a drainage method. The supported Ag-Pd/C3N4 nano-catalyst is prepared as follows: a solution is prepared from Ag and Pd in a certain mole ratio, a carrier C3N4 is added to the solution, a reducer is added to the mixed solution, and filtration and drying are performed. Compared with conventional supported catalysts, the high-activity and high-selectivity supported Ag-Pd/C3N4 nano-catalyst used for formate dehydrogenation to prepare hydrogen can be prepared by adjusting the content of Ag, Pd and C3N4.

Method for formate dehydrogenation under catalysis of supported Ag-Pd/C3N4 nano-catalyst

The invention discloses a method for catalyzing formic acid for dehydrogenation by use of a supported Au-Pd/mpg-C3N4 nano-catalyst and belongs to the technical field of chemistry and chemical engineering. The method comprises the following steps: placing the well prepared supported Au-Pd/mpg-C3N4 nano-catalyst into a reactor; placing the reactor in an oil bath; heating up to a certain temperature; adding a formic acid and sodium formate mixed solution into the reactor for reaction; collecting generated hydrogen by the drainage method. The supported Au-Pd/mpg-C3N4 nano-catalyst is prepared in such a way that Au, Pd and deionized water are configured according to a certain molar ratio, a supporter mpg-C3N4 is added into the obtained solution, a reducing agent is added into the obtained mixed solution, and filtering and drying are performed. Compared with the traditional supported catalyst, the supported Au-Pd/mpg-C3N4 nano-catalyst which is high in activity and selectivity and used for manufacturing hydrogen by formic acid dehydrogenation is only prepared in such a way that the contents of metal gold and palladium in the catalyst and the content of mpg-C3N4 are adjusted.

Method for catalyzing formic acid for dehydrogenation by use of supported Au-Pd/mpg-C3N4 nano-catalyst

The invention discloses a method for using AgO/Cr2O3-MgO-SiO2 four-component composite oxide catalyst for catalyzing ethyl alcohol to prepare butadiene and belongs to the technical field of chemistry and chemical engineering Chromium salt, magnesium salt, silicate and deionized water are prepared according to a certain molar ratio, the pH value is adjusted through alkali liquor, and through the steps of concentrating, filtering, drying, roasting and cooling, Cr2O3-MgO-SiO2 three-component carriers are obtained through preparation; a certain quantity of three-component carriers are placed into an AgNO3 solution of certain concentration, stirred to be thick at certain temperature, transferred into a drying oven to be dried, then placed into a muffle furnace to be roasted for certain time at certain temperature, ground and sieved to obtain the four-component composite oxide catalyst Compared with traditional three-component catalyst, according to the method, the substance amount ratio of metal four-component catalyst in the catalyst is adjusted so that the high-activity four-component composite oxide catalyst can be obtained and used for catalyzing ethyl alcohol to prepare butadiene

Method for using AgO/Cr2O3-MgO-SiO2 four-component composite oxide catalyst for catalyzing ethyl alcohol to prepare butadiene

The invention discloses a method for recycling trifluoromethanesulfonic acid from trifluoromethanesulfonic acid amine salt waste water, and belongs to the technical field of environment engineering. The method comprises the steps that 1, water in the acid amine salt waste water including trifluoromethanesulfonic acid is removed through steaming, and a weak polar solvent is added for washing; 2, water and inorganic base are added to trifluoromethanesulfonic acid amine salt for reacting, trifluoromethanesulfonic acid metal salt crude products are obtained, and the crude products are purified through recrystallization; 3, purified trifluoromethanesulfonic acid metal salt is added to an intensive polar solvent to be dissolved, then sulfuric acid is added for reacting, and liquid-solid mixtures with sulfate sediment are obtained; 4, the liquid-solid mixtures are filtered, and filtrate is subjected to normal-pressure rectification to obtain trifluoromethanesulfonic acid. Recycled trifluoromethanesulfonic acid is high in purity, especially the content of sulfuric acid impurities is extremely low, the conditions of production and operation are moderate, and high safety is achieved.

Method for recycling trifluoromethanesulfonic acid from trifluoromethanesulfonic acid amine salt waste water

The invention discloses a method for recycling cyanuric acid from a cyanuric acid waste residue, and belongs to the technical field of environmental protection. The method particularly includes the following steps: mixing water and the cyanuric acid waste residue with the liquid-solid mass ratio of (2-5):1, and carrying out heating hydrolysis for 10-25 min at the temperature of 105-155 DEG C; adding a decolorizing agent into the material liquid with the solid-liquid mass ratio of (0.01-0.05):1, stirring for 15-45 min, and then filtering; taking the filtrate, cooling for 3-6 h at the temperature of 10-30 DEG C, and filtering again to obtain a crude cyanuric acid product; and drying the obtained crude cyanuric acid product for 4-7 h at the temperature of 80-110 DEG C, and thus obtaining high-purity cyanuric acid. The obtained cyanuric acid product has the advantages of white color, high purity and high yield; and in particular, the prepared decolorizing agent has high decolorization efficiency and can be reused.

Method for recycling cyanuric acid from cyanuric acid waste residue

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