Method of fabricating medium-high temperature CO2 sorbents made of alkali metal promoted calcium aluminate carbonates

US8754002B2 · kind B2 · utility

Assignee

• INSTITUTE OF NUCLEAR ENERGY RESEARCH ATOMIC ENERGY COUNCIL, R.O.C. · TW

Inventors

• Ching-Tsung Yu · Taoyuan, TW
• Chi-Hung Wang · San Jose, US
• Yau-Pin Chyou · Dottikon, CH

Key dates

• Filing date: Jul 11, 2011
• Grant date: Jun 17, 2014
• Expiry date: Feb 21, 2033

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/151
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A dry material is synthesized by alkali metal (Li, Na and K) promoted calcium aluminate carbonates to obtain a CO2 sorbent used at a temperature higher than 600 Celsius degrees (° C.). The key composition of the sorbents is 52˜69% of CaO, which is beneficial to capture CO2 at 400˜800° C. A breakthrough result is achieved by using this sintering-resistant sorbent, which includes the features of 50% initial carbonation capacity and 20 folds CO2 capturing performance maintained after 40˜60 hours. Besides, alkali bearing material provides good velocity in CO2 capturing/releasing cycles; for example, by using Li and K series sorbents, 40 hours is required for 40 cycles only.