Synthesis of Ca-based Layered Double Hydroxide from Blast Furnace Slag and Its Catalytic Applications

• Kuwahara Yasutaka

  Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University Unit of Elements Strategy Initiative for Catalysts & Batteries, Kyoto University

• Yamashita Hiromi

  Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University Unit of Elements Strategy Initiative for Catalysts & Batteries, Kyoto University

Abstract

A Ca-based layered double hydroxide (LDH) was synthesized from blast furnace slag (BFS) via a facile and low-cost manufacture process. The synthesis was performed through a two-step method including (i) an acid-dissolution and (ii) an alkali-precipitation process using BFS as a sole metal source. The formation of Ca–Al LDH crystals occurred above pH 9, and under the optimal synthetic conditions (at 373 K and pH 11.5) a well-crystallized stoichiometric hydrocalumite (Ca:Al:Cl=2:1:1) incorporating the slag-derived metallic elements in its structure was obtained with a metal recovery rate of 85%. The impacts of synthesis pH and temperature on the material structures were investigated in detail. The catalytic properties of the thus synthesized LDH material was demonstrated on industrially important several chemical reactions including (1) oxidation of alkyl aromatics with O₂, (2) CO₂ fixation reaction and (3) biodiesel synthesis from vegetable oil. These results open up a new route to fabricate a low-cost LDH compound and its potential availability as an alternative solid base catalyst.

Journal

• ISIJ International

  ISIJ International 55 (7), 1531-1537, 2015

  The Iron and Steel Institute of Japan

Keywords

• blast furnace slag
• layered double hydroxide
• materials recycling
• base catalyst

Details

• CRID: 1390282681465212288
• NII Article ID: 130005089755
• DOI: 10.2355/isijinternational.55.1531
• ISSN: 13475460
• ISSN: 09151559
• Web Site: https://www.jstage.jst.go.jp/article/isijinternational/55/7/55_1531/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed