Enhancing oxidation resistance of Cu(I) by tailoring microenvironment in zeolites for efficient adsorptive desulfurization

Abstract

The zeolite Cu(I)Y is promising for adsorptive removal of thiophenic sulfur compounds from transportation fuels. However, its application is seriously hindered by the instability of Cu(I), which is easily oxidized to Cu(II) even under atmospheric environment due to the coexistence of moisture and oxygen. Here, we report the adjustment of zeolite microenvironment from hydrophilic to superhydrophobic status by coating polydimethylsiloxane (yielding Cu(I)Y@P), which isolates moisture entering the pores and subsequently stabilizes Cu(I) despite the presence of oxygen. Cu(I) in Cu(I)Y@P is stable upon exposure to humid atmosphere for 6 months, while almost all Cu(I) is oxidized to Cu(II) in Cu(I)Y for only 2 weeks. The optimized Cu(I)Y@P material after moisture exposure can remove 532 μmol g−1 of thiophene and is much superior to Cu(I)Y (116 μmol g−1), regardless of similar uptakes for unexposed adsorbents. Remarkably, Cu(I)Y@P shows excellent adsorption capacity of desulfurization for water-containing model fuel.

Cu-doping SnO2-NiO p-n Heterostructure for Significant Raman Enhancement with EF > 1010: Toward Ultrasensitive VOCs Sensing

“…XPS data of Cu showed the binding energy of Cu 2p3/2 for SnO2-NiOx/Cu at 932.5 and 933.3 eV, which were consistent with the divalent states of Cu + and Cu 2+ (Fig. 2j) 22 . From O 1s XPS spectrum of SnO2-NiOx/Cu, three peaks were clearly observed, in which O1s peak at 532.2 eV was ascribed to the lattice oxygen (O 2-), while the high binding energy (533.3 eV) was assigned to the absorbed oxygen ions (O 2and O -) on the surface 23 , which were consistent with those of SnO2-NiO.…”

Adjusting accommodation microenvironment for Cu+ to enhance oxidation inhibition for thiophene capture

“…IR spectra verifies the introduction of PDS (Figure S11). Three new IR bands at 2980, 1257, and 790 cm −1 , attributed to the characteristic vibration of CH 3 , SiCH 3 , and Si(CH 3 ) 2 in PDS, become visible in Cu 2 O@SBA‐15@P 39,40 . Cu 2 O@SBA‐15 is highly hydrophilic and a water droplet was immersed in it (Figure S12).…”

Control of Functionalized Pore Environment in Robust Ionic Ultramicroporous Polymers for Efficient Removal of Trace Propyne from Propylene

“…Nuclear magnetic resonance (NMR) spectra of the materials were collected using an Avance III 400 MHz spectrometer (Bruker Corp. Germany). 13 C cross-polarization (CP)/ magic angle spinning (MAS) NMR spectra were recorded with the contact time of 2 ms (ramp 100) and pulse delay of 2 s, and the sample was spinned with a rate of 6 kHz. Fourier transform infrared (FT-IR) spectra were collected on a Nicolet 6700 FT-IR spectrometer equipped with the spectra over the range from 4000 to 525 cm −1 .…”

“…Traditional cryogenic distillation suffers from intensive consumption of energy and high cost . Highly efficient and energy-saving adsorptive separation based on porous materials is very attractive for industrial gas separation and purification. − However, similar molecular dimensions (C 3 H 4 : 4.52 × 4.02 × 6.61 Å 3 ; C 3 H 6 : 5.25 × 4.16 × 6.44 Å 3 ) and physicochemical properties of C 3 H 4 and C 3 H 6 make their separation a great challenge, especially for high deep removal of low C 3 H 4 content. , …”