Amorphous aluminosilicates are applied in adsorption and catalysis because they can be designed to possess micro-, meso-, macropores. In this work, we analyze the nitrogen physisorption isotherms recorded for a series of materials based on amorphous synthesized by sol–gel via hydrolysis acidic medium (ACSG), with poly(ethylene glycol) template (P), gel skeletal reinforcement (GRS). We found that porosity ACGS GRS types was dominated mesopores, while P-type micropores but non-negligible...

The addition of Ga to Cu/SiO₂generates new active sites increasing selectivity methanol. mechanistic implications are studied by<italic>in situ</italic>DRIFTS and kinetic experiments.

Different zirconium precursors lead to different bulk properties but similar defective surfaces.

The study of the reactivity catalysts requires one to assess chemical kinetics and mechanisms in absence mass transport artifacts. Despite existence models criteria for assessing presence transfer limitations during catalytic tests gas-phase reactions isothermal fixed bed reactors, literature does not present straightforward protocols performing latter calculations. In this work, we a systematic protocol calculations above. Particularly, estimating effectiveness factor external Weisz-Prater...

The elimination of sulfur from fossil fuels via hydrodesulfurization (HDS) is paramount to produce cleaner fuels. Ultradeep HDS refers reducing in below the 10 ppm level. Nevertheless, under such conditions, dibenzothiophenes (DBTs) are be desulfurized presence highly complex aromatic structures that possibly exert inhibitory effects. Therefore, this contribution presents a kinetic study inhibition effect diverse structures: naphthalene (NP), fluorene (FL), and phenanthrene (PHE), on...

Synthesis of defective microporous/mesoporous MOF-808.

The dry reforming of methane is a promising technology for the abatement CH4 and CO2. Ni–La2O3 catalysts are characterized by their long-term stability (100 h) when tested at full conversion. kinetics over these types has been studied using both power-law Langmuir–Hinshelwood-based approaches. However, studies typically deal with fitting net rate, hence disregarding competing parallel surface processes different possible configurations active surface. In this work, we synthesized catalyst...

Despite the humongous volume of literature aiming to present synthesis innovative, more selective, stable, and active solid catalysts, catalysts that come be used at industrial level, known as technical are scarcely studied poorly understood starting from fact most information on their manufacturing remains an secret. Therefore, many knowledge gaps uncertainties in techniques suitable transform catalytic powders into lie ahead those researchers who decide engage development study applied...

The Pd/Ga ratio influences the phases formed during catalysis. best catalyst necessitates formation of Pd–Ga intermetallic compounds and also a low content Ga₂O₃, whose excess tend to block surface sites.

Ordered materials with interconnected porosity allow the diffusion of molecules within their inner porous structure to access active sites located in microporous core. As a follow-up our work on engineering MOF-808, this contribution, we study synthesis defective MOF-808 using two different strategies: use modulators and surfactant-assisted obtain ordered pores. The results indicated that (i) chain length led formation microporous/mesoporous MOFs through missing linker defects. However,...

Background: Tissue integration and vessel formation are important criteria for the successful implantation of synthetic biomaterials subcutaneous implantation. Objective: We report optimization plasma surface modification (PSM) using argon (Ar), oxygen (O 2 ) nitrogen (N gases a polyurethane polymer to enhance tissue angiogenesis. Methods: The scaffold’s bulk characteristics were compared before after PSM with either Ar, O N . viability adhesion human dermal fibroblasts (HDFs) on modified...

Heavy crude oil processing leads the way in current refining. These crudes yield larger amounts of distillable heavy fractions such as vacuum gas (VGO). VGO must be treated at least two refining units: a hydrotreating unit where sulfur, nitrogen, and other heteroatoms are removed, hydrocracking suitable fuels obtained. Removal during hydrotreating, particularly, dictates efficiency hydrocracking. In first part this work, nature refractory nitrogen-containing compounds on performance catalyst...

Abstract In the current study, we present synthesis of novel low cost bio‐polyurethane compositions with variable mechanical properties based on castor oil and glycerol for biomedical applications. A detailed investigation physicochemical polymer was carried out by using testing, ATR‐FTIR, X‐ray photoelectron spectroscopy (XPS). Polymers were also tested in short term in‐vitro cell culture human mesenchymal stem cells to evaluate their biocompatibility potential applications as biomaterial....

This work contributes to the establishment of a scientific basis for understanding effect shaping on physicochemical properties and functionalities catalytic powders. In particular, influence graphite (G) as agent vanadium–aluminum mixed (hydr)oxides, VAlO, is presented herein. Graphite was added in different loadings (x = 1, 3, 7 wt %). VAlO-xG hydroxides were tableted then calcined obtain oxides. Both series materials characterized tested propane oxidative dehydrogenation (ODH)....

Abstract In the present work, liquid‐solid interaction of liquid N‐heteroaromatic compounds, commonly in petroleum feedstocks refineries, with Y zeolites used as hydrocracking catalysts was followed using IR‐ATR spectroscopy. The inhibition zeolitic acid sites by strongly basic pyridine and weakly indole highlighted a continuous flow cell. Results were assessed Density Functional Theory calculations to compute vibrational frequencies according nature sites: silanol groups or acidic OH...

Nanocellulose, a versatile nanomaterial with wide range of applications, is gaining significant attention for its sustainable and eco-friendly properties. In this study, we investigate the influence reaction variables on surface chemistry TEMPO-oxidized cellulose nanofibers (TOCN) from palm oil empty fruit bunch (EFB) fibers, high content biomass. Reaction time, primary oxidizing agent, pretreatment process affect, to various extents, EFB-TOCN. Conductometric titrations (CT), X-ray...