Porous Ceramics Adsorbents Based on Glass Fiber-Reinforced Plastics for NOx and SOx Removal.

Hiroyuki Kinoshita,Narong Mungkung,Kentaro Yasui,Tomohiro Haraguchi,Naoaki Misawa,Toshifumi Yuji,Taichi Hamasuna,Koya Sasaki

doi:10.3390/polym14010164

Abstract

To reuse waste glass fiber-reinforced plastics (GFRPs), porous ceramics (i.e., GFRP/clay ceramics) were produced by mixing crushed GFRP with clay followed by firing the resulting mixture under different conditions. The possibility of using ceramics fired under a reducing atmosphere as adsorbent materials to remove NOx and SOx from combustion gases of fossil fuels was investigated because of the high porosity, specific surface area, and contents of glass fibers and plastic carbides of the ceramics. NO2 and SO2 adsorption tests were conducted on several types of GFRP/clay ceramic samples, and the gas concentration reduction rates were compared to those of a clay ceramic and a volcanic pumice with high NO2 adsorption. In addition, to clarify the primary factor affecting gas adsorption, adsorption tests were conducted on the glass fibers in the GFRP and GFRP carbides. The reductively fired GFRP/clay ceramics exhibited high adsorption performance for both NO2 and SO2. The primary factor affecting the NO2 adsorption of the ceramics was the plastic carbide content in the clay structure, while that affecting the SO2 adsorption of the ceramics was the glass fiber content.

Highlights

Most glass fiber-reinforced plastic (GFRP) wastes are sent to landfills without recycling because they are difficult to recycle using the existing recycling technologies due to the content of glass fibers [1,2]
Several types of oxidatively and reductively fired GFRP/clay ceramics, a clay ceramic, and unfired Bora were used for the NO2 and SO2 adsorption tests
To examine the effect of glass fibers and plastic carbide residues on the NO2 adsorption performance of the reductively fired GFRP/clay ceramics, NO2 adsorption tests were conducted on the glass fibers in the GFRPs and the GFRP carbides

Summary

Introduction

Most glass fiber-reinforced plastic (GFRP) wastes are sent to landfills without recycling because they are difficult to recycle using the existing recycling technologies due to the content of glass fibers [1,2]. An efficient waste GFRP recycling technology is required [3–6]. The types of clay and GFRPs used for the ceramic production are selected according to the type of the required products. In the ceramic manufacturing process, the resin components in GFRPs thermally decompose during the firing process, and the glass fibers remain in the clay matrix. The generation of fine glass fiber dust is reduced during this process because both the clay and glass fibers or the glass fibers alone are sintered during the firing process of ceramics [8,9]

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