Chemical Looping with Oxygen Uncoupling of the Lignocellulosic Biomass Main Model Compound: Product Distribution and Kinetic Analysis on Lignin

Abstract

Product distribution and kinetic analysis of lignin were investigated during the chemical looping with oxygen uncoupling (CLOU) process. Thermodynamic simulation of the CLOU process was performed on the basis of the Gibbs free energy minimization method. The influence of the reaction temperature and mixing ratio of the oxygen carrier (CuO) on the product distribution was explored via a fixed-bed reactor combined with online mass spectrometry. Kinetic parameters from the formation of the main gas-phase products were solved by an isoconversion method. The results of the thermodynamic analysis showed that the optimal reaction conditions were 850 °C and the blending ratio of the oxygen carrier was 1.22. Overall, nearly 50% of the solid product was obtained, and the gas products from CLOU were mainly CO and CO2, accounting for more than 90%. When the temperature was raised from 700 to 850 °C, the CO2 content was reduced from 66.65 to 55.66% and the CO content was increased from 30.02 to 40.40%. The product distribution was similar to the thermodynamic simulation results. Among the gaseous products, the activation energy of H2 formation was the highest, which can reach 88.14 kJ mol–1. This study provides basic data for the thermochemical conversion of lignin and other papermaking wastes.

Biomass-Based Chemical Looping Gasification: Overview and Recent Developments

“…Due to the very high reactivity of oxygen uncoupling materials, less metal oxide material used is needed in the system which could reduce the reactor size and associated costs. OU-BCLG is a new concept and a few studies related to OU-CLG have been performed with biomass [57][58][59].…”

Virtual Special Issue of Recent Research Advances in China: Chemical Looping

“…Wang et al study the reaction performance of a CaSO 4 –Ca 2 CuO 3 mixed oxygen carrier with coal in CLC, which indicates that the addition of Ca 2 CuO 3 can substantially promote the reactivity of CaSO 4 toward the coal. Zhang et al investigate the product distribution as well as the reaction kinetics during the chemical looping with oxygen uncoupling (CLOU) of lignin by conducting fixed-bed reactor tests and thermodynamic simulation. Jiang et al report Cu and Ca co-doped lanthanum nickle perovskite-type materials (La 1– y Ca y Cu x Ni 1– x O 3 ) with facilitated O 2– transport capability as oxygen carriers for CLC of methane at low temperatures (200–600 °C).…”

“…Zhang et al11 investigate the product distribution as well as the reaction kinetics during the chemical looping with oxygen uncoupling (CLOU) of lignin by conducting fixed-bed reactor tests and thermodynamic simulation. Jiang et al12 report Cu and Ca co-doped lanthanum nickle perovskite-type materials (La 1−y Ca y Cu x Ni 1−x O 3 ) with facilitated O 2− transport capability as oxygen carriers for CLC of methane at low temperatures (200−600 °C).…”

Intensification Insights from Chemical Looping Combustion Using Coal–Biomass Mixtures with Fe-Based Oxygen Carrier

“…Chemical looping with oxygen uncoupling (CLOU) is an innovative and improved idea with removal of the rate limiting stage of char gasification in CLC [6,7]. Many experimental studies have highlighted the feasibility of a twin fluidized bed for CLC as well as CLOU using coal, petcoke char particles and biomass as solid fuels [8][9][10][11][12].…”