1,721,088 research outputs found
BTEX extraction from activated charcoal using dichloromethane as alternative to carbon disulfide
No full textDeterminazione simultanea degli NOx in atmosfera mediante l’impiego di un nuovo substrato per il campionamento attivo
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The fascinating world of mayenite (Ca12Al14O33) and its derivatives
Full text linkMayenite (12CaO·7Al2O3) is a mesoporous calcium aluminum oxide, with a characteristic crystalline structure. The framework of mayenite is composed of interconnected cages with a positive electric charge per unit cell that includes two molecules [Ca24Al28O64]4+, and the remaining two oxide ions O2−, often labelled “free oxygen”, are trapped in the cages defined by the framework. Starting from mayenite structure several derivatives have been prepared through advanced synthetic protocols by free oxygen substitution with various anions. Mayenite and its derivates have been intensively investigated in many applications which include catalysis (oxidation and reduction, ammonia synthesis, pinacol coupling), environmental sensors and CO2 sorbent materials. In this review, we summarize our recent results on the main applications of mayenite and its derivatives. © 2021, The Author(s)
Study of the antibacterial activity in the gas phase of a chemical formulation for household waste management
No full textThe aim of this study was to formulate a product (microbicide mixture) that could slow down
bacterial proliferation during the storage of household waste. We used harmless and natural
components, known for their antimicrobial properties in the liquid phase at direct contact
with the microbes. The antimicrobial activity of the microbicide mixture formulated was
evaluated over a range of concentration in two types of tests, in the liquid and in the gas
phase. Once the efficacy as antimicrobial agent in the liquid phase in direct contact with the
microbe (Escherichia coli) was confirmed, we adopted a new approach to evaluate the effect
of the vapour phase both on the microbes growth and its duration. Here we show that the
perfect combination that gives rise to an antimicrobial mixture useful to control microbial
growth (Staphylococcus aureus, Escherichia coli, Debaryomyces hansenii or Penicillium
citrinum) up to four weeks is the one between more volatile agents (2-propanol and
limonene) and a less volatile agent (cinnamaldehyde). The pleasant smell as well as the
synergic antibacterial and antifungal function of the natural components of this mixture
makes it attractive in domestic waste management
A study on the catalytic hydrogenation of aldehydes using mayenite as active support for palladium
No full textAbstract Selective benzaldehyde reduction to benzyl alcohol was accomplished using a new catalyst based on Pd dispersed on mayenite (Ca12Al14O33) support. In this work, mayenite has been doped in its nanocages with H- ions to investigate its role in the reduction of aldehydes. Benzaldehyde reduction was observed in H2 atmosphere (120°C, 8 atm). Catalytic performances compared to commercial Pd/C catalyst are superior in terms of selectivity and comparable as activity
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