The dry reforming of methane (DRM), i.e., the reaction and CO2 to form a synthesis gas, converts two major greenhouse gases into useful chemical feedstock. In this work, we probe effect role Fe in bimetallic NiFe catalysts. To end, monometallic Ni, Fe, Ni-Fe catalysts supported on MgxAlyOz matrix derived via hydrotalcite-like precursor were synthesized. Importantly, textural features catalysts, specific surface area (172-178 m2/gcat), pore volume (0.51-0.66 cm3/gcat), particle size (5.4-5.8...

To mitigate climate change, the reduction of anthropogenic CO2 emissions is paramount importance. capture and storage has been identified as a promising short- to midterm solution, yet underground faces often severe public resistance. In this regard, conversion captured into useful chemicals or fuels an attractive alternative. Here, we propose experimentally demonstrate process that directly integrates utilization allowing for full selective production synthesis gas. The both economically...

Transition metal nanoparticles (NPs) are typically supported on oxides to ensure their stability, which may result in modification of the original NP catalyst reactivity. In a number cases, this is related formation NP/support interface sites that play role catalysis. The metal/support effect verified experimentally commonly ascribed stronger reactants adsorption or facile activation such compared bare NPs, as indicated by DFT-derived potential energy surfaces (PESs). However, relevance...

Selective upcycling of polyolefin waste has been hampered by the relatively high temperatures that are required to cleave carbon-carbon (C-C) bonds at reasonably rates. We present a distinctive approach uses highly ionic reaction environment increase polymer reactivity and lower energy transition states. Combining endothermic cleavage C-C with exothermic alkylation reactions cracking products enables full conversion polyethylene polypropylene liquid isoalkanes (C6 C10) below 100°C. Both...

Tailoring the molecular environment around catalytically active sites allows for enhancement of catalytic reactivity through a hitherto unexplored pathway. In zeolites, presence water creates an ionic via formation hydrated hydronium ions and negatively charged framework aluminum tetrahedra. The high density cation-anion pairs determined by concentration zeolite induces local strength that increases excess chemical potential sorbed uncharged organic reactants. Charged transition states...

CO2 capture and storage is a promising concept to reduce anthropogenic emissions. The most established technology for capturing relies on amine scrubbing that is, however, associated with high costs. Technoeconomic studies show using CaO as high-temperature sorbent can significantly the costs of capture. A serious disadvantage derived from earth-abundant precursors, e.g., limestone, rapid, sintering-induced decay its cyclic uptake. Here, template-assisted hydrothermal approach develop...

Syngas production via the dry reforming of methane (DRM) is a highly endothermic process conducted under harsh conditions; hence, main difficulty resides in generating stable catalysts. This can, principle, be achieved by reducing coke formation, sintering, and loss metal through diffusion support. [{Ni(μ2-OCHO)(OCHO)(tmeda)}2(μ2-OH2)] (tmeda = tetramethylethylenediamine), readily synthesized soluble broad range solvents, was developed as molecular precursor to form 2 nm Ni(0) nanoparticles...

MXenes, a recently discovered family of two-dimensional (2D) materials, are promising catalysts and supports for applications in heterogeneous catalysis; however, the thermal stability MXenes their surface chemistry not fully explored. Here, we report that 2D molybdenum carbide Mo2CTx remains stable shows no appreciable sintering up to ca. 550–600 °C reducing environment, as assessed by combined situ X-ray absorption near-edge spectroscopy (XANES) powder diffraction (XRD) study during...

A transparent and flexible graphene charge-trap memory (GCTM) composed of a single-layer channel 3-dimensional gate stack was fabricated on polyethylene naphtalate substrate below eutectic temperatures (~110 °C). The GCTM exhibits functionality ~8.6 V window 30% data retention per 10 years, while maintaining ~80% transparency in the visible wavelength. Under both tensile compressive stress, shows minimal effect program/erase states on-state current. This can be utilized for electronics that...

A key challenge in the catalytic conversion of CH4 and CO2 into a synthesis gas (CO H2) via dry reforming methane (DRM) is development stable catalysts. We demonstrate that reductive exsolution metallic Ru from fluorite-type solid solutions Sm2RuxCe2–xO7 (x = 0, 0.1, 0.2, 0.4) yields catalysts with high activity remarkable stability for DRM. The feature Ru(0) nanoparticles about 1–2 nm diameter are uniformly dispersed on surface resulting oxide support. exsolved material was investigated by...

The conversion of methane and carbon dioxide into a synthesis gas, the so-called dry reforming (DRM), suffers from stability issue caused by coke formation at surface Ni-based catalysts. Using colloidal approach, we demonstrate that supported 3–4 nm bimetallic NiFe nanoparticles with Ni/Fe ratio 3 have an enhanced compared to corresponding pure catalyst higher activity conventional active sites for DRM are associated Ni0, while FeO, observed operando XAS under conditions, allows effective...

This study evaluated zeolite-based sorbents for iodine gas [I2(g)] capture. Based on the framework structures and porosities, five zeolites, including two faujasite (FAU), one ZSM-5 (MFI), mesoMFI, ZSM-22 (TON), as well mesoporous materials, were I2(g) capture at room temperature 150 °C in an iodine-saturated environment. From these preliminary studies, three best-performing zeolites ion-exchanged with Ag+ under similar conditions. Energy-dispersive X-ray spectroscopy data suggest that...

The benefits of hierarchical zeolites for the conversion bulky molecules like polymeric waste have been reported in literature; however, impact mesopore sizes and connectivities on rates, product selectivities, catalyst deactivation context plastic upcycling has not systematically probed. Here, we synthesized a suite MFI FAU via desilication under varying conditions metal-free polyethylene reactions batch flow (473–523 K). Polyethylene (solid) rates (normalized by Bro̷nsted acid site...

Abstract Transforming polyolefin waste into liquid alkanes through tandem cracking‐alkylation reactions catalyzed by Lewis‐acid chlorides offers an efficient route for single‐step plastic upcycling. Lewis acids in dichloromethane establish a polar environment that stabilizes carbenium ion intermediates and catalyzes hydride transfer, enabling breaking of polyethylene C−C bonds forming alkylation. Here, we show selective deconstruction low‐density (LDPE) to is achieved with anhydrous aluminum...

Abstract OBJECTIVE We investigated the safety and efficacy of stereotactic radiotherapy as an alternative therapy to surgical resection for optic nerve sheath meningiomas (ONSMs). METHODS Thirty patients 33 nerves with ONSMs were treated conventional fractionated treatment (CF-SRT) between July 1996 May 2001 use a 6-MeV LINAC designed dedicated radiosurgery. The technique involved daily CF-SRT involving relocatable frame, average three isocenters, high-radiation dose conformality established...

The catalytic enantioselective fluorination and amination of β-keto phosphonates catalyzed by chiral palladium complexes is described. Treatment with N-fluorobenzenesulfonimide (NFSI) as electrophilic fluorinating reagent diethyl azodicarboxylate (DEAD) under mild reaction conditions afforded the corresponding α-substituted in moderate to excellent yields enantiomeric excesses.

Hydrogen (H2) is a clean energy carrier and major industrial feedstock, e.g., to produce ammonia methanol. High-purity H2 can be produced efficiently from methane (CH4) using chemical looping-based approaches. In this work, we report on the development of calcium-iron-based oxygen (Ca2Fe2O5) doped with Ni or Cu investigate its redox performance for production when CH4 used as fuel. The experimental results suggest that rapid formation metallic through exsolution promotes reducibility...

As energy-related issues increase significantly, interest in ammonia (NH3) and its potential as a new eco-friendly fuel is increasing substantially. Accordingly, many studies have been conducted on electrochemical nitrogen reduction reaction (ENRR), which can produce an environmentally friendly manner using molecule (N2) water (H2O) mild conditions. However, research still at standstill, showing low performances faradaic efficiency (FE) NH3 production rate due to the competitive insufficient...

CaO is an effective high temperature CO2 sorbent that, however, suffers from a loss of its absorption capacity upon cycling due to sintering. The cyclic uptake CaO-based sorbents improved by Ca3Al2O6 as structural stabilizer. Nonetheless, the initially rather stable Ca3Al2O6-stabilized yet starts decay after around 10 cycles capture and regeneration, albeit at significantly reduced rate compared unmodified reference material. Here, we show combined use in situ XRD together with textural...

The strong peristaltic contraction of the stomach facilitates mixing and emptying ingested food, which occurs rhythmically at approximately 3 cycles/min (cpm) in humans. Generally, most patients with gastroparesis show gastric electrical dysrhythmia that is disrupted signals controlling contractions. For treatment dysrhythmia, vivo impulses to via an implanted stimulator have been known restore these deformations. Nevertheless, improved sensors monitor contractions are still needed current...

An integrated Ca/Cu looping process has been proposed recently for CO2 capture. It uses the exothermic in-situ reduction of CuO with methane or natural gas to supply heat required endothermic calcination CaCO3 regenerate CaO following sorption cycle via bifunctional CaO/CuO composites. composites possess excellent redox characteristics, but rapid decline in capture performance remains an unresolved problem. Two different types stabilizers, i.e., Al2O3 that can form a mixed phase CaO, and MgO...