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Author(s): C. V. Miguel
R. Trujillano
V. Rives
M. A. Vicente
A. F. P. Ferreira
A. E. Rodrigues
A. Mendes
L. M. Madeira
Title: High temperature CO2 sorption with gallium-substituted and promoted hydrotalcites
Issue Date: 2014
Abstract: 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.
Subject: Engenharia química, Engenharia química
Chemical engineering, Chemical engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia química
Engineering and technology::Chemical engineering
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/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/PTDC/EQU-ERQ/098730/2008
info:eu-repo/grantAgreement/Autoriadade de Gestão do Programa Operacional Regional do Norte/Programas Integrados de IC&DT/NORTE-07-0124-FEDER-000026/Chemical Engineering: Process Optimization and Energy Conversion/LEPAE/CEFT - RL1
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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