Influence of the Sn incorporation method in ZSM-11 zeolites in the distribution of bio-oil products obtained from biomass pyrolysis

Abstract

Considering the importance of biowaste valorization, peanut shell pyrolysis was studied. Products yields and composition were evaluated. Results were improved by heterogeneous catalysis of the fluid products. For this purpose, tin modified ZSM-11 zeolites were synthesized and thoroughly characterized. The materials were prepared by means of wet impregnation or alkaline treatment of the parent matrix and by hydrothermal synthesis with tin as heteroatom. Those porous crystalline solids were further evaluated in the thermo-catalytic pyrolysis of the lignocellulosic biowaste. The bio-oil composition was significantly affected by the selected catalysts. The obtained results were correlated with physicochemical characterization data. It was found that Sn incorporation by the wet impregnation method promotes Lewis and total acidity. This material gave the highest hydrocarbon and the lowest oxygenated selectivities in the bio-oil of the studied situations. Particularly, aromatic compounds were favored over it. In terms of poisoning, coke formation over the catalysts was low and easily removed by calcination.