The presented report focuses on an in-depth detailed characterization of immobilized methyltrioxorhenium (MTO), giving catalysts with a wide spectra of utilization. The range of mesoporous materials with different SiO₂/Al₂O₃ ratios, namely mesoporous alumina (MA), aluminosilicates type Siral (with Al content 60%-90%) and MCM-41, were used as supports for immobilization of MTO. The tested suppor...

The central control of mineral weathering rates on biogeochemical systems has motivated studies of dissolution for more than 50 years. A complete physical picture that explains widely observed variations in dissolution behavior is lacking, and some data show apparent serious inconsistencies that cannot be explained by the largely empirical kinetic "laws." Here, we show that mineral dissolution ...

Introduction and background: Zeolite minerals are hydrated framework aluminosilicates common to altered volcanic and volcanoclastic rocks, and the soils derived from them [1]. The mineralogy, chemistry, textural context, and abundance of zeolites provides insight into chemical weathering, hydrothermal, and metamorphic processes on Earth, in a variety of climates and tectonic settings. Zeolites ...

The subject of hybrids based on layered inorganic compounds such as clays has been studied for a considerable time, but the area is enjoying a resurgence of interest and activity as a result of the exceptional properties which can be realized from such nanocomposites. Common clays are naturally occurring minerals, and are thus subject to natural variability in their constitution. Many clays are...

The term “nanocomposite” is widely used to describe a very broad range of materials, where one of the phases has a submicrometer dimension [1–4].1 In the case of polymerbased nanocomposites, this typically involves the incorporation of “nano” fillers with one (platelets), two (fibers, tubes), or all three dimensions at the submicrometer scale. However, strictly speaking, simply using nanometer-...

Abstract This paper reports a novel approach in the study of trace-element mobility during argillization volcanic glass that is based on situ laser ablation inductively coupled plasma mass spectrometry analyses and spatially related illite-smectite collected form fraction separates. The material studied originates from lacustrine sediments Dinaride Lake System bear evidence intensive weathering...

The article presents the results of studying mineralogical and geochemical features coals clay interlayers Shubarkol deposit. There were analyzed 71 samples layers 49 coal using instrumental neutron activation analysis (INAA), powder X-ray diffractometry, scanning electron microscopy. A comprehensive characteristics their enclosing was carried out. variety criteria made it possible to establish...

The discharge of fluid–particle mixture tailings can cause serious disturbance to the marine environment in deep-sea mining polymetallic nodules. Unrecovered nodule fines are one key components tailings, but little information has been gained on their properties. Here, we report major, trace, and rare earth element compositions <63 μm particles produced by experimental degradation two types ...