Enhancement of aromatics production via cellulose fast pyrolysis over Ru modified hierarchical zeolites

In the present study, Ru modified hierarchical zeolites x Ru-MZSM were developed for cellulose fast pyrolysis . Comprehensive catalyst characterizations including XRD , XPS , N 2 adsorption-desorption, Py-IR and so on, were performed to unveil the essential structural properties. The chemical modification and Ru decoration remarkably regulated the distribution of Brønsted/Lewis acid sites. The presence of RuO x species would supply abundant strong Lewis acid sites for participating catalytic cracking , dehydration, decarbonylation, decarboxylation, cyclization, aromatization, etc., in cooperation with Brønsted acid sites. In-situ generated active Ru 0 centers during cellulose pyrolysis might facilitate the proceeding of deoxygenation , hydride transfer, and dehydrogenation . Among the as-prepared catalysts screened, 2Ru-MZSM was much more efficient in aromatics production from cellulose fast pyrolysis compared to parent ZSM, wherein the total aromatics yield achieved 16.8% at temperature of 650 °C and heating rate of 10 °C/ms with corresponding E value as low as 23.40 kJ/mol. Also, plausible reaction mechanism for x Ru-MZSM involved cellulose fast pyrolysis was proposed in detail.