Abstract The removal of acetylene from ethylene streams is key in industry for manufacturing polyethylene. Here we show that a well-defined Pd 1 –Au dimer, anchored to the walls metal–organic framework (MOF), catalyses selective semihydrogenation with ≥99.99% conversion (≤1 ppm acetylene) and >90% selectivity extremely rich (1% acetylene, 89% ethylene, 10% H 2 , simulated industrial front-end reaction conditions). proceeds an apparent activation energy ∼1 kcal mol –1 working even at 35...

The synthesis of chabazite with high solid yields is achieved by the rational combination directing effects a source Si and Al coming from USY zeolites inexpensive tetraethylammonium. Moreover, Cu-CHA materials prepared post-synthetic "one-pot" methodologies show activity stability for SCR NOx.

By using a faujasite zeolite as the sole Si and Al source with simple ammonium cyclic cations, it has been possible to synthesize SSZ-39 high yields, prepare catalyst for potential industrial applications in SCR of NOx.

The synthesis of nanosized SSZ-39 zeolite has been achieved using a high silica FAU as the Si and Al source tetraethylphosphonium (TEP) cations OSDAs.

A key factor to improve the performance of metal–organic frameworks (MOFs) is design and synthesis hierarchical interconnected porosity at different length scales. The presence secondary mesopore systems, in addition intrinsic framework micropores, avoids inherent mass-transfer constraints that occur multiple examples liquid phase chemical processes. Different strategies introduce ordered void spaces MOF materials are reviewed here, based on either bottom-up or top-down approaches. thorough...

From theoretical calculations and a rational synthesis methodology, it has been possible to prepare nanocrystalline (60-80 nm) chabazite with an optimized framework Al distribution that positive impact on its catalytic properties. This is exemplified for the methanol-to-olefin (MTO) process. The nanosized material predicted maximizes formation of required MTO hydrocarbon pool intermediates, while better precluding excessive diffusion pathways favor rapid catalyst deactivation by coke formation.

This study aimed to assess the capacity of saponite modified with n-hexadecyltrimethylammonium bromide (CTAB) and/or 3-aminopropyltriethoxysilane (APTS) adsorb and remove caffeine from aqueous solutions. Powder X-ray diffraction (PXRD) revealed increased basal spacing in saponites. Small-angle scattering (SAXS) confirmed PXRD results; it also showed how different clay layers were stacked provided information on swelling natural saponites functionalized CTAB APTS. Thermal analyses, infrared...

Abstract The preparation of the iron‐containing SSZ‐39 zeolite is described for first time through two different synthesis methods: post‐synthetic cation exchange and one‐pot synthesis. nature stability iron species within Fe‐SSZ‐39 materials have been studied characterization techniques, their catalytic activity has evaluated selective reduction (SCR) NO x with ammonia. directly synthetized performs better SCR ammonia than other related Fe‐zeolites, particularly at elevated reaction...

Abstract The direct preparation of different iron‐containing Beta and CHA zeolites has been attempted under diverse synthesis conditions, including in alkaline fluoride media, to evaluate the influence their physicochemical properties on selective catalytic reduction (SCR) NO x using NH 3 as reductant. Of Fe‐Beta zeolites, sample prepared absence alkali cations with a Si/Al ratio around 13 showed high conversion values (>90 %). However, this catalyst suffered from severe deactivation when...

The combination of well-defined Fe3+ isolated single-metal atoms and Ag2 subnanometer metal clusters within the channels a metal-organic framework (MOF) is reported characterized by single-crystal X-ray diffraction for first time. resulting hybrid material, with formula [Ag02(Ag0)1.34FeIII0.66]@NaI2{NiII4[CuII2(Me3mpba)2]3}·63H2O (Fe3+Ag02@MOF), capable catalyzing unprecedented direct conversion styrene to phenylacetylene in one pot. In particular, Fe3+Ag02@MOF─which can easily be obtained...

We present a green procedure for the synthesis of metal-organic frameworks (MOFs) (having Zn, Ni, or Co) in graphene oxide aqueous suspensions (obtained with graphitized nongraphitized carbon nanofibers) avoiding organic solvents and high temperatures. The materials were thoroughly characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), N2/CO2-physisorption, Raman photoelectron (XPS) spectroscopies. results demonstrate that nature...

This study introduces an approach to developing catalytic systems using multifunctional task-specific Support Ionic Liquid-like Phases (TS-SILLPs). These TS-SILLPs leverage the unique properties of ionic liquids (ILs) while addressing traditional...

The synthesis of amides by the direct reaction carboxylic acids with amines is an industrially relevant in fine chemistry and drug synthesis, as well a fundamental process for construction proteins living organisms. To promote this process, use heterogeneous catalysts preferred over their homogeneous counterparts, due to advantages related simple isolation, recovery recycling. In addition, peptide bond formation solid surfaces interesting not only from point view industrial organic but also...

Abstract Among the various cross coupling reactions, C−C reaction has attracted many researchers to investigate in last four decades. The continuous, constant, and consistent progress this field fetched a Noble prize 2010, showing importance of diversified fields. transition metals studied for reaction, Pd is one that exhibited highest activity due its unique features reactivity. Although Pd‐based homogeneous catalyst was preferred choice researchers, slowly diverted towards development...

Simple solid-state mixing and calcination of catalytic amounts metal-organic frameworks (MOFs) in the presence aluminosilicates allow for generation active robust supported metal oxide nanoparticles that catalyze C–C C–N bond formations. The proposed Cu Zn containing outperform state-of-the-art solid catalysts synthesis various aza-heterocycles under mild heterogeneous conditions, exhibiting highest turnover frequencies (TOFs) ever reported cost-efficient reusable CuO ZnO sites.

Abstract In this contribution we propose an alternative catalytic system based on MOF derivatives and small pore zeolites for the selective conversion of CO 2 into light olefins, using lowest metal loadings highest GHSV reported in literature. The catalyst synthesis involves deriving In−Zr oxides from MOFs containing these metals their structure, i. e. (Zr)UiO‐67‐bipy‐In, via direct calcination presence zeolite, avoiding co‐precipitation, washing mixing steps. This effectively creates a...

Abstract The activation of C−H bonds in hydrocarbons (saturated, unsaturated and aromatics) by single atom catalysts immobilized a solid support is an active research front catalysis. On the one hand, different examples transition metal atomically dispersed on inorganic, organic hybrid supports are constantly designed, synthesized characterized using advanced microscopy spectroscopic techniques. other active, selective stable sites recently developed as high performant heterogeneous for...

Modern society is heavily dependent on advancements in polymer science, however, there are increasing environmental concerns about plastics waste that demand sustainable solutions. Ionic Liquids (ILs) have emerged as non-innocent...

The preparation of novel efficient catalysts─that could be applicable in industrially important chemical processes─has attracted great interest. Small subnanometer metal clusters can exhibit outstanding catalytic capabilities, and thus, research efforts have been devoted, recently, to synthesize catalysts bearing such active sites. Here, we report the gram-scale Ag20 within channels a highly crystalline three-dimensional anionic metal–organic framework, with formula...

Two different catalytic platforms, MOF and mesoporous silica, were compared as porous support for basic amino groups to promote sequential multi-step reactions.

Al-rich MTW zeolites show large pore accessibility, high Brönsted acidity and activity for the cracking of <italic>n</italic>-decane.