X-ray photoelectron spectroscopy was used to establish the relative concentration and the chemical environment of modifying species in a series of vermiculites pillared with mixed precursors of Al-Zr, Al-Hf and Al-Ce. The ...

Three bentonite clays from deposits located in Brazil were used to study the pillar parameters such as the use of heating in the synthesis of the pillar agent; it was verified the feasibility of controlling the density of ...

Two pillaring methods were tested to synthesize pillared clays containing mixed Al/Co pillars. Using the first method, based on the traditional procedure, were obtained materials containing different Co concentrations: 10, ...

A series of vermiculites pillared with mixed precursors of Al–Zr, Al–Hf and Al–Ce were obtained from natural vermiculite subjected to a process of negative charge reduction through hydrothermal treatment. The catalytic ...

Research background: The observable discrepancies in entrepreneurship activity across countries have motivated both researchers and policymakers to comprehend the sources of these variations. Certain scholars have suggested ...