Plasma-assisted fluidized-bed atomic layer deposition of Pd-Cu nanoparticles on porous powder for CO₂ hydrogenation

Abstract

novel plasma-assisted fluidized-bed atomic layer deposition (FB-ALD) process to synthesize Pd-Cu bimetallic nanoparticles is reported, using palladium hexafluoroacetylacetonate, copper(I)-N, N'-di-iso-propylacetamidinate, and H2 plasma. The process is able to uniformly deposit Pd-Cu nanoparticles on porous powder, which is a mixture of -Al2O3 (30 wt%), amorphous aluminum silicate (50 wt%) and molecular sieve (20 wt%) (ASM). With the metal loadings of 13.1 and 2.5 mg/g for Pd and Cu, respectively, the afforded 13.1Pd-2.5Cu catalyst shows excellent catalytic performance for the hydrogenation of CO2 in a dielectric barrier discharge reactor with no intentional heating. Under the condition of the discharge input power of 24.6 W, H2-to-CO2 ratio of 4 in feed gas, and gas hourly space velocity of 7595 h-1, the conversion of CO2 can reach as high as 38.0%, with the CH4 and CH3OH product selectivities of 6.7% and 12.8%, respectively. DFT calculation is further employed to understand the associated CH3OH formation mechanism.

Reinforced Volumetric Discharge by Tuning Permittivity and Spatial Scale Intensified Pulse Current for Efficient CO2 Reduction

“…The waveform distributions in applied voltage and current reflect, to some extent, the CO 2 reduction capabilities of the different packing systems. ,, As shown in Figure a, in the empty reactor, the peak current in the sinusoidal superposition was 21.1 mA. After the introduction of Al 2 O 3 particles, the pulsed current almost disappears while the sinusoidal current is enhanced.…”

Plasma‐catalytic CO2 methanation over NiO/bentonite catalysts prepared by solution combustion synthesis

“…The high‐voltage electrode was connected to a high‐voltage power supply (CTP‐2000, Nanjing Suman Plasma Technology Co., LTD) capable of delivering a bipolar sine wave output with a peak‐to‐peak voltage of 0–30 kV at an AC frequency of 20 kHz. [ 40 ] The peak‐to‐peak voltage and current applied to the DBD reactor were measured using a digital oscilloscope (Teknix, DPO4104) with a high‐voltage (Teknix, P6015A) and current probes (Teknix, 6021AC). The input power ( P in ) was calculated based on Lissajous plot.…”

Enhanced Photocatalytic Performance of UiO-66-NH2 MOFs by Ar Plasma Modification for Reduction of Cr (VI)

“…Two common approaches developed to solve these problems are post synthesis modification of UiO-66-NH 2 (defect tailoring) and the composite of UiO-66-NH 2 with other photosensitive materials (surface chemistry) since the defect engineering and surface chemistry can tailor the properties of UiO-66-NH 2 . , Compared to traditional post synthetic methods like thermal activation/dehydration, acid/base, or high-temperature treatments, the technique of plasma modification is a time-saving, efficient, and green method to fabricate the defective MOF materials. Generally, the low-temperature plasma consists mainly of ground or excited atoms and molecules, electrons, positive and negative ions, − which impact or react with the MOFs to form the missing-linker defects. Meanwhile, the low-temperature plasma treatment is able to reduce the thermal effect on MOF materials since the bulk gas temperature in the plasma remains close to room temperature.…”