Prospect of layered double hydroxide for high quality syngas production from catalytic pyrolysis of biomass

Syngas was an important raw material for producing liquid fuels and a variety of high value-added products. Pyrolysis technology was one of the effective ways to produce synthesis high quality syngas from biomass at low temperature. During pyrolysis progress, tar macromolecules in pyrolytic volatiles can be effectively decomposed and reformed by catalyst. At the same time, the volume fraction of CO2 and CH4 can decrease and the gas components can be modulated via water gas shift reaction, resulting in producing high quality syngas. However, design and development of catalysts with high activity, thermal stability and suppression of coke deposition have been the hotspots and difficulties. In this paper, the latest research progress in terms of active composition modulation, structure and physicochemical properties optimization of support during catalytic pyrolysis of biomass were comprehensively reviewed. Due to the tunability of metal component and content in layers, high dispersion of metal cations on an atomic level and unique basic properties, LDHs materials show excellent performances in heterogeneous catalysis. Therefore, their potential application in biomass catalytic pyrolysis for syngas production was prospected here. The mixed metal and metal oxides(M/MMO) derived from LDHs precursors via topotactic transformation exhibit highly dispersed active component and tunable acid-base properties, which can effectively resolve the problem of sintering at high temperature and formation of coke. As a result, biomass can be converted into high quality syngas efficiently and stably. © 2021, Central South University Press. All right reserved.