High temperature CO2 sorption with gallium-substituted and promoted hydrotalcites

• Type: Article in International Scientific Journal
• Date: 2014

Authors

C. V. Miguel (Author) FEUP; R. Trujillano (Author) Other; V. Rives (Author) Other; M. A. Vicente (Author) Other; A. F. P. Ferreira (Author) FEUP; A. E. Rodrigues (Author) FEUP; A. Mendes (Author) FEUP; L. M. Madeira (Author) FEUP

Journal

Title: Separation and Purification Technology

Vol. 127

Pages: 202-211

ISSN: 1383-5866

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 30 Citations

ISI Web of Science

Scopus - 41 Citations

Scientific classification

FOS: Engineering and technology > Chemical engineering

CORDIS: Technological sciences > Engineering > Chemical engineering

Associated Projects

PTDC/EQU-ERQ/098730/2008 - Integração de Reactores de Membrana com Processos Adsorptivos usando-se Catalisadores Suportados em Monolitos para a Produção de Hidrogénio de Elevada Pureza

LEPAE/CEFT - RL1 - Chemical Engineering: Process Optimization and Energy Conversion

Other information

Authenticus ID: P-009-GHA

DOI: 10.1016/j.seppur.2014.03.007

Abstract (EN): Hydrotalcites (HTC) and gallium-substituted hydrotalcites (HTC-10Ga) were prepared by co-precipitation and modified by impregnation with alkali (K and Cs) and alkaline-earth (Sr) metals. The materials were tested and screened for CO2 sorption at 573 K. The results indicate that the modification with potassium greatly enhanced the sorption capacity when compared with the original materials (both HTC and HTC-10Ga). An outstanding sorption capacity (2.01 mmol cm(-3) at 1.08 bar) was obtained for the sample partially substituted with gallium and modified with potassium (HTC-10Ga-20K). Moreover, this material was also submitted to sorption-desorption cycles towards CO2 under low-pressure conditions (< 0.0001-0.15 bar) to assess its use in cyclic operation. An average working capacity of 0.97 mmol cm(-3) and 0.25 mmol cm(-3) was obtained after repeated cycles at 573 K and 473 K, respectively. The sorption kinetics was assessed through uptake measurements, showing two parallel resistances, which were well described by the proposed model.

Language: English

Type (Professor's evaluation): Scientific

Notes: Publicação abrangida pelo Journal Citation Reports 2015

No. of pages: 10