The mesoporous molecular sieve MCM-41 type is considered promising with support for metals in various refining processes of petroleum-based materials, such as adsorbent and catalyst for environmentally friendly processes ...

Water is a natural resource of inestimable value. More than one input essential for production and a strategic resource for economic development, it is vital to the maintenance of biological, geological and chemical cycles ...

The MCM-41 is a mesoporous molecular sieve, which has an ordered pore system of adjustable size between 15 and 100 Ǻ, and very high surface area (700 m2 g-1). The construction of an ordered pore system allows use of various ...

The study for obtaining Co-W-P alloys have been developed in recent years and is considered one of the most effective methods for improving the chemical and physical properties of metal surfaces. Electroplating is an ...

The sisal (Agave sisalana) is a plant grown in semi-desert regions and adapted well to the climate and soil of northeastern Brazil, is today the largest producer and exporter in the world. This study aimed to analyze the ...

This paper describes the synthesis of various (alkyl and aryl) amidoximes using different functionalized nitriles in aqueous medium at room temperature. The new methodology has proven to be effective in a wide variety of ...

This paper deals with the production and use of audiovisual teaching science, the average state primary school and José Luiz Neto located in the municipality of Barra de Santa Rosa, in the state of Paraíba. Your goal is ...

In this work, the effect of variation of the operating parameters of current density, temperature and pH of the electrolytic bath on the electrodeposition of Ni-Mo-P using sodium citrate as a complexing agent due to the ...

Carbohydrates are the most abundant macromolecules polyfunctional nature. These organic compounds may be named as: carbohydrates, sugars, saccharides or carbohydrates, most commonly, a name that is derived from its general ...

Water is of fundamental importance for the life of all species. Brazil is a privileged country regarding the availability of water, holds 53% of the fresh water source available in South America. The equatorial climates, ...