Development of an Inexpensive Mercury Vapor Removal System Using Chlorine-Doped Carbonaceous Materials

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K19855
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 64:Environmental conservation measure and related fields
• Research Institution: Hokkaido University
• Principal Investigator: TSUBOUCHI Naoto 北海道大学, 工学研究院, 准教授 (90333898)
• Project Period (FY): 2021-07-09 – 2023-03-31
• Keywords: 環境技術 / 環境対応 / 有害化学物質 / 表面・界面物性

Outline of Final Research Achievements

To develop a carbon-based Hg remover surface modified with chlorine, the effect of metal species on chlorine doping was investigated. The results showed that the extent of reaction of HCl with carbon containing K and Ca increased with increasing carbon active sites, and the intensity of XPS peaks attributed to inorganic and organic Cl species increased significantly compared to carbon alone. In addition, to produce activated carbon from inexpensive raw materials, peat was mixed with urea and natural soda ash, which has abundant reserves, and heated to 800-900℃. It was found that activated carbon with a large surface area and pore volume could be produced. Furthermore, the adsorption capacity of chlorine-doped carbonaceous material, a Si recovery residue from rice husks, for gaseous metallic mercury was high (more than twice that of conventional materials), indicating that the interaction between mercury and chlorine is strong.

Free Research Field

環境化学

Academic Significance and Societal Importance of the Research Achievements

学術的には、安価な原料から調製した炭素質物質の表面をＣｌで修飾し、Ｈｇ除去剤として用いる点に最大の特徴がある。このような試みは「低品位の褐炭由来の炭素活性サイトはＨＣｌと容易に反応して、有機Ｃｌ種に変化する」という発見に基づいており、極めて独創的な研究である。本成果は、コークス炉、焼結機のみならず高炉や電気炉の排ガスならびに石炭やバイオマスの燃焼排ガス、ガス化とガスタービンもしくは燃料電池を組み合せた複合発電システム用の燃料ガスなどに適応可能な簡便で低コスト型の高温ガス精製法に展開する可能性が多いに期待され、その社会的意義は非常に大きい。