Study on the Preparation of Plasma-Modified Fly Ash Catalyst and Its De–NOX Mechanism

Abstract

Fly ash and bentonite were mixed in a certain proportion as raw materials to prepare a denitration catalyst. In previous studies, it has been concluded that fly ash-type catalysts can provide significant catalytic activity for denitrification after being modified with oxygen. In this study, the effect of plasma conditions on the denitration performance of the catalyst was investigated from the aspects of plasma modification power, modification time, and the flow rate of the gas. Boehm titration and infrared analysis systems were used to characterize the performance of the catalyst. The experimental results show that the optimal modification power is 60 W, the optimal modification time is 20 min, and the optimal gas flow rate is 40 mL/min.

Review of the Preparation and Application of Porous Materials for Typical Coal-Based Solid Waste

“…By modification, fly ash can form a pore structure and rougher surface, greatly increasing its specific surface area and effectively enhancing its performance in adsorption, catalysis, and other aspects. The common modification methods include acid modification, alkali modification, and plasma modification [43][44][45].…”

A review of the advances in catalyst modification using nonthermal plasma: Process, Mechanism and Applications

“…It was observed that the concentrations of O atoms, Mn 4+ and Co 2+ on the surface of Mn-CoO x were significantly increased after plasma treatment, which were the key to NO oxidation. Zhang et al [114] proposed that the discharge power, treatment time, and airflow of O 2 gas during plasma treatment would increase the basic functional groups, thereby improving the denitration activity. It was revealed that the removal efficiency of NO of plasma-modified catalyst reaches 95% within 1 min under the conditions of 60 W power, a treatment time of 20 min, and an air flow of 40 ml/min.…”

Formation of Fly Ash Catalysts and Selection of a Matrix Binder and Its Application in Denitration

“…Bentonite can absorb 5 times its own weight in water because the unit cell particles are not large and the surface is broad, irregular, and charged. Expansive soil is evenly mixed with fly ash and aqueous solution and then blended together. − During the extrusion molding process, the stability of the extruded catalyst is greatly ensured, and the change of the catalyst form is prevented . So far, proven cumulative reserves have exceeded 5.087 billion tons, and the unreserved reserves are expected to exceed 7 billion tons.…”