Effect of biomass type, heating rate, and sample size on microwave-enhanced fast pyrolysis product yields and qualities

•Microwave-enhanced fast pyrolysis is reported for heating rates of 1–50 °C/s.•33 Biomass samples and blends were tested for feedstock composition impacts.•Mineral content and volatile matter accounted for the most liquid yield variability.•The same parameters also predicted water and acid content in the liquid product.•Observed bio-oil yields did not increase for heating rates >10 °C/s.