Framework-associated aluminum is demonstrated to facilitate a reversible switch between Lewis and Brønsted acidity in zeolites with the acid sites preferentially populating side-pockets case of mordenite.

Zeolites, although key materials used in industrial processes, remain poorly understood on a molecular level despite their well-defined crystal lattices. In fact, obtaining direct spectroscopic signatures and resolving the structure of Lewis acid sites (LAS) has remained challenge. this work, thanks to 1D 2D 1H, 15N, 27Al MAS NMR spectroscopy, carried out at different temperatures (from 298 down 107 K), we were able obtain LAS Brønsted (BAS) mordenite zeolite presence absence adsorbed...

Despite being used extensively as heterogeneous catalysts and supports at the academic industrial levels alike, nature of aluminum-based Lewis acidity in zeolites is not completely understood. In this study, we discovered a correlation between aluminum structure framework zeolite mordenite. The amount octahedrally coordinated these samples present under wet conditions correlates to number acid sites detected by Fourier-transform infrared spectroscopy adsorbed probe molecules fully dehydrated...

While the structures of Brønsted acid sites (BAS) in zeolites are well understood, those Lewis (LAS) remain an active area investigation. Under hydrated conditions, reversible formation framework-associated octahedral aluminum has been observed acidic form. However, structure and mechanisms currently unknown. In this work, combined experimental 27 Al NMR spectroscopy computational data reveal for first time details zeolite aluminium. The LAS site becomes kinetically allowed thermodynamically...

Organic solid waste management is a major challenge in high population density areas like apartments, educational institutions, hospitals, etc., as their disposal with other wastes could not only lead to issues vector menace, odour generation but also would loss of resources that be reused such nutrients which will benefit soil. In places the portion generated organic waste, especially food and yard from campus, apart paper waste. Composting an treatment method cost effective leads resource...

Abstract Es gibt vielzählige direkte, selektive Ansätze, um Methan partiell zu oxidieren, jedoch ist noch keiner von ihnen zur industriellen Reife gelangt. In diesem Zusammenhang die Oxidation Methanol eine schwierige, aber lohnende Aufgabe, da sie wirkungsvolle Methode ist, das Abfackeln Erdgas, als Nebenprodukt in der Erdölindustrie anfällt, unterbinden, und zugleich Möglichkeit bietet, valorisieren. Dieser Aufsatz berücksichtigt Synthese seinen Derivaten ausgehend durch homogen‐...

Abstract The direct catalytic oxidation of methane to oxygenates, a reaction that garners significant scientific and industrial interest, is plagued by poor methane‐based yields. Some the best homogeneous systems reported date convert methyl esters using catalysts with complex organic ligands reach high yields at relatively temperature (>423 K) pressure (20–70 bar). In our study, we used simple copper compound, copper(II) oxide, selectively trifluoroacetate 363 K low (5 bar) resulting in...

Abstract A promising strategy to break through the selectivity‐conversion limit of direct methane conversion achieve high yields is protection methanol via esterification a more stable methyl ester. We present an aerobic methane‐to‐methyl‐ester approach that utilizes highly dispersed, cobalt‐containing solid catalyst, along with significantly favorable reaction conditions compared existing homogeneously‐catalyzed approaches (e.g. diluted acid, O 2 oxidant, moderate temperature and pressure)....

Ammonia synthesis chemistry with lithium-nitrogen-hydrogen materials is largely confined to pathways involving lithium hydride and imide. Herein, we explore an alternate pathway featuring nitride-hydride that shows more favorable characteristics from activity, cyclability perspective.

Alongside innovation in teaching practice, student assessment chemical engineering has seen significant changes the recent past. This article undertakes a systematic review of advances that have been reported practice education. The main trends emerge are: shift towards authentic methods, an increase emphasis on peer-assessment and other approaches for group-based assignments, greater use digital tools delivery assessments improvement marking feedback practice. analysis also examines...

While several engineering and science disciplines, including biology environmental science, have greatly benefited from adopting a systems thinking approach, its extension to chemistry education is much more recent advancement. The initial body of literature in this direction has largely surveyed the feasibility for general courses. Herein, we go step further explore possibilities that present instruction advanced courses, specifically context catalysis education. Since conventionally been...

Abstract While the structures of Brønsted acid sites (BAS) in zeolites are well understood, those Lewis (LAS) remain an active area investigation. Under hydrated conditions, reversible formation framework‐associated octahedral aluminum has been observed acidic form. However, structure and mechanisms currently unknown. In this work, combined experimental 27 Al NMR spectroscopy computational data reveal for first time details zeolite aluminium. The LAS site becomes kinetically allowed...

Biodiesel comprises mono-alkyl esters of long-chain fatty acid methyl (FAME) derived from a renewable lipid feedstock. A major technical issue with the use biodiesel is that it more prone to oxidation during storage, when compared petroleum fuel, due high content polyunsaturated are easily oxidizable compounds such as acids, aldehydes, and alcohols. (Jatropha Pongamia) antioxidants (Turmeric butylated hydroxytoulene) were used for this study. We found value viscosity pongamia increased...

This article discusses the methodology of a partnership-based collaborative project between investigators comprising two academics and one educational developer diverse group international students studying at UK University. The were recruited to co-design survey instrument better understand lived experiences their peers across institution, but prior doing so engaged in structured process weekly engagement create safe space where they could feel comfortable explore own experiences. produced...

Abstract A promising strategy to break through the selectivity‐conversion limit of direct methane conversion achieve high yields is protection methanol via esterification a more stable methyl ester. We present an aerobic methane‐to‐methyl‐ester approach that utilizes highly dispersed, cobalt‐containing solid catalyst, along with significantly favorable reaction conditions compared existing homogeneously‐catalyzed approaches (e.g. diluted acid, O 2 oxidant, moderate temperature and pressure)....

A scale-flexible process for the direct and selective oxidation of methane to primary oxygenates is great interest, however, a commercially feasible approach has yet be realized due number challenges. Low product yields imposed by well-established selectivity-conversion limit are particularly burdensome methane-to-methanol chemistry. One strategy that emerged break out this in situ esterification produced methanol more oxidation-resistant methyl ester. However, these methaneto-methyl-ester...