Structural and catalytic properties of copper silicate nanomaterials

Abstract

Nanosized copper silicates with three different structural morphology (amorphous, nanotubes and MEL) were prepared using different synthesis methods. The physico-chemical properties of copper silicates were characterized by XRD, FT-IR, SEM, HRTEM, N 2 -physisorption, XPS and H 2 -TPR techniques. The results indicated that the preparation conditions affect reduction behavior and textural properties of nanosized copper silicates. Hydrothermal synthesis method yielded chrysocollalike cuSio 3 nanotubes, which possessed high surface area and pore volume with easy reducibility. The catalytic performances of synthesized copper silicate nanostructures were evaluated for dehydrogenation of methanol. It was found that dehydrogenation activity is depended on the structural properties of copper silicates. Highest activity was observed for copper silicates with nanotube morphology. Catalytic dehydrogenation activity of copper silicates was also related to presence of more number of Cu-O-Si species, easy reducibility and Lewis acid centers. The CuSiO 3 nanotubes sample also exhibited good stability under investigated reaction conditions that deactivation was not detected for 48 h.

Engineering Heterostructure-Incorporated Metal Silicates Anchored on Carbon Nanotubes for Highly Durable Lithium Storage

“…In the FTIR spectra (Figure c), the common peaks that appeared at 1638 and 3421 cm –1 correspond to the bending vibration of H–O–H and the stretching vibration of −OH. The peaks located at around 665 cm –1 are attributed to the bending mode of Ni–O and Cu–O, and the peaks at 1106 and 1022 cm –1 are separately ascribed to Ni–O–Si and Cu–O–Si, respectively. , Moreover, the peak changes in CNT@NiSi, CNT@CuSi, and CNT@NiCuSi also proved the integration. Raman spectra of all the products presented two main peaks located at the wavenumbers of 1347 and 1579 cm –1 , corresponding to the D band and G band (Figure d).…”

Structural Unit Determination in Silica Nanoparticles Using Infrared Micro-Reflectance Spectroscopy

“…Despite the application of the method to colloidal silica samples, the model relies only on the structural units of Si tetrahedra, so the method presented in this work can be generalized to other interesting silicate nanomaterials. 6,7 Moreover, similar analyses can be performed on mesoporous materials, where the roles of air and SiO 2 as matrix and inclusions are reversed.…”

“…5 Although silica nanoparticles produced by the classic Stöber process are still by far the most common example of this type of material, other amorphous nanosilicates with additional cations are starting to become widespread. 6,7 A fundamental aspect of amorphous materials is their short-range order (SRO), and the network topology in general, which influence greatly properties such as crystallization, chemical durability, and bioactivity. 8 SRO is often quantified by magic-angle spinning nuclear magnetic resonance (MAS-NMR) spectroscopy, based on the distinct chemical shifts of each structural unit.…”

Textile‐Bound Copper Silicate as a New Peroxidase‐Like Nanozyme for Organic Dye Decolorization

“…Various forms of copper silicates (CS) have found several interesting applications; historically, their mixture is one of the earliest artificial blue pigments in Egypt [1]. Currently, CS are used as catalysts for methanol dehydrogenation [2] or for the efficient synthesis of propargylamine [3]. CS is also an efficient adsorbent for hemoglobin [4], microcystins [5], or for organic pollutants present in water [6].…”