Degradation of benzene, toluene, and xylene with high gaseous hourly space velocity by double dielectric barrier discharge combined with Mn₃O₄/activated carbon fibers

Abstract

A novel strategy for degradation of high gaseous hourly space velocity (GHSV) benzene, toluene, xylene (BTX) by double dielectric barrier discharge (DDBD) coupled with Mn3O4/ activated carbon fibers (ACF) catalysts was proposed in this work. A series of Mn3O4/ACF catalysts were synthesized by hydrothermal method and characterized. The results showed that all the prepared catalysts could improve the degradation of BTX in DDBD system and inhibit the production of ozone. Among the catalysts with different Mn loading, the 5.6%Mn3O4/ACF, with the highest Mn(+3) content (43.2%) and the highest absorbed oxygen content (38.5%), presented the best catalytic performance. In 5.6%Mn3O4/ACF+DDBD system, the degradation efficiency of benzene, toluene and xylene could reach 49.9%, 79.7% and 97.1% respectively with SIE of 400 J L-1. The carbon balance and CO2 selectivity, meanwhile, were 83.3% and 51.1%, respectively. It seemed that Mn(+3) and absorbed oxygen content could be a reference for the catalytic performance of Mn3O4/ACF catalysts. The higher the Mn (Ⅲ) and absorbed oxygen, the better the catalytic performance of the Mn3O4/ACF catalysts. The organic by-products were identified by chromatography-mass spectrometry (GC-MS), and a possible reaction mechanism of BTX in DDBD reactor and catalyst surface was proposed based on the composition of organic by-products.

Numerical Simulation of Fine Blanking Die Wear and Die Performance Analysis

“…e blanking clearance of fine blanking is much smaller than that of ordinary blanking. With the increase of blanking clearance, the wear amount of the female die decreases [21][22][23] as shown in Figure 6. is is because the blanking clearance increases and the hydrostatic pressure in the fine blanking process decreases, so the positive pressure on the inner side of the die and the edge decreases.…”

Prediction of Dissolved Oxygen Concentration in Sewage Treatment Process Based on Data Recognition Algorithm

“…On the one hand, it avoids the excessive random or blind selection of the initial weight threshold of the neural network in the initial stage. On the other hand, in the optimization process of weight threshold, two types of search mechanisms, FWA and COA, are adopted to give full play to their respective strengths and continuously carry out information exchange and mutual cooperation between groups and individuals [23][24][25][26].…”

Research on Human Pose Capture Based on the Deep Learning Algorithm

“…MaxTRAQ2D is video-based motion tracking software for extracting kinematic characteristics from standard AVI video files. rough manual and automatic tracking, users can view angles and distances between the points frame by frame [9].…”