Hydrogen generation from NaBH4 hydrolysis catalyzed by cobalt (0)-Deposited cross-linked polymer brushes: Optimization with an experimental design approach

Co/Fe3O4@GO catalyst for one-step hydrogen generation from hydrolysis of NaBH4: Optimization and kinetic study

Halloysite nanotubes (HNT) have received widespread interest due to their unique microstructure and properties. They have been widely used as nano-containers or supporting materials to prepare advanced functional materials in many fields, spanning from life science and medical uses to energy and environmental applications. It is well-known that the performance of HNT is highly influenced by their surface area and pore volume, depending on the detailed structure properties, such as lumen space, wall thickness and length of HNT. Particularly, the loading ability of HNT is related to the detailed microstructures, such as morphology parameters (the inner/outer diameter and length), wall structure, active sites, interlayer space, as well as surface modification by organic groups and inorganic nanoparticles. As a special one-dimension nanoporous clay mineral with tubular morphology, the fundamental knowledge on the microstructure of HNT is of key importance to their specific applications. This review summarized several key factors related to the microstructures of halloysite, such as the morphology and origin of HNT, the coexisting impurities and the dispersion degrees of HNT, then rationalize the relations between the microstructures and physicochemical properties of halloysite, followed by the recent progress on microstructures evolution of HNT under various modification methods such as calcination, acid/alkali treatment, pseudomorphic transformations, and surface modifications as well as functional loading, physical expansion and intercalation. 

Microstructure and properties of halloysite nanotubes and modification methods: A comprehensive review

Investigation of the performance of metal-free catalyst prepared from black tea and green tea waste for hydrogen production via methanolysis of sodium borohydride and optimization using response surface methodology

Among boron compounds, NaBH4 has emerged as a prominent candidate for hydrogen energy sources due to its environmentally friendly characteristics and high hydrogen content of up to 10.6 wt%. However,...

The mechanism and challenges of Cobalt-Boron-based catalysts for hydrolysis of sodium borohydride

The hydrolysis of sodium borohydride (NaBH4) is a promising reaction with a possible practical application as a means of generating hydrogen. The efficiency of hydrogen production can be enhanced significantly by use of a catalyst during the reaction. Cobalt borides show significant catalytic activity, but unsupported CoB particles aggregate easily and are difficult to separate from the reaction medium for re-use. The objectives of the present study were to use halloysite (Hly) as a support material to increase the catalytic activity and reusability of a Co metal-based system and to investigate the binary effect of metal loading and reaction parameters on the hydrolysis of NaBH4. Catalysts were prepared by wet impregnation and chemical reduction. The surface morphology and structural properties of the prepared catalysts were characterized using N2 adsorption-desorption and the Brunauer-Emmet-Teller (BET) method, field emission scanning electron microscopy (FE-SEM), with energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma mass spectrometry (ICP-MS). Response surface methodology (RSM) was used to optimize metal loading and reaction conditions for the hydrogen-generation rate. Optimum reaction conditions were determined (using Design Expert 7.0 software) as 5.01 wt.% Co loading using a Co-B/Hly-supported catalyst, 0.44 M NaBH4, 10.66 mg catalyst, and at a reaction temperature of 39.96°C. The maximum hydrogen generation rate was 33,854 mL min−1 gCo−1 under these conditions.

OPTIMIZATION OF HYDROGEN GENERATION BY CATALYTIC HYDROLYSIS OF NaBH4 WITH HALLOYSITE-SUPPORTED CoB CATALYST USING RESPONSE SURFACE METHODOLOGY

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OPTIMIZATION OF HYDROGEN GENERATION BY CATALYTIC HYDROLYSIS OF NaBH4 WITH HALLOYSITE-SUPPORTED CoB CATALYST USING RESPONSE SURFACE METHODOLOGY