Affiliation:
1. Guilin University of Technology
Abstract
Abstract
A series of sludge-based biochar catalysts with different sludge calcination temperatures and different Co and Mn addition ratios were prepared by a simple hydrothermal synthesis method for the simultaneous removal of acetone and NO in a low-temperature photothermal co-catalytic system with acetone replacing NH3. Among them, the catalyst with sludge calcined at 400 ℃ and Co, Mn addition ratios of 4:1 (400@4:1) showed the optimal photothermal catalytic performance, with the conversion of acetone and NO reaching 42.98% and 52.41% at 240 ℃, respectively. The physicochemical properties of each catalyst were analyzed by characterization of SEM, XRD, BET, XPS, FT-IR, H2-TPR, O2-TPD, UV-vis, and transient photocurrent response (TPC). The effects of specific surface area, valence and content of Co and Mn atoms, types of surface adsorbed oxygen and lattice oxygen, optical properties, and other factors on the catalytic properties of the catalysts were investigated. A possible mechanism for the catalytic conversion of acetone and NO on the catalyst surface was proposed based on the Mars - van Krevelen (MvK) mechanism. A new strategy is provided for the resource utilization of sewage sludge and the preparation of photothermal catalysts for the simultaneous removal of acetone and NO at low cost.
Publisher
Research Square Platform LLC
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