NOVELTY - Producing pyrolysis gas and/or pyrolysis oil from at least partially biogenic starting materials, comprises (a) providing at least partially biogenic starting materials including lignocellulosic biomass, lignocellulosic residual substances and a carbon-based catalyst, (b) thermally treating the starting materials in a pyrolysis reactor at a first temperature, (c) contacting the pyrolysis products with the carbon-based catalyst at a second temperature, and (d) collecting deoxygenated pyrolysis products in a separation device in which product separation takes place.    USE - The method is useful for producing pyrolysis gas and/or pyrolysis oil from at least partially biogenic starting materials, gas engine suitable gas product, motor suitable gas, motor-suitable oil and/or deacidified pyrolysis oil, and deoxygenation catalyst (all claimed).    ADVANTAGE - The method produces pyrolysis gas and/or pyrolysis oil in cost-efficient manner, ensures quick pyrolysis, reduces the pyrolysis condensates, and minimizes formation of unsaturated hydrocarbon compounds.    DETAILED DESCRIPTION - Producing pyrolysis gas and/or pyrolysis oil from at least partially biogenic starting materials, comprises (a) providing at least partially biogenic starting materials including lignocellulosic biomass, lignocellulosic residual substances and a carbon-based catalyst, (b) thermally treating the starting materials in a pyrolysis reactor at a first temperature such that pyrolysis of the starting material to liquid, vaporous or gaseous pyrolysis products takes place, (c) contacting the pyrolysis products with the carbon-based catalyst at a second temperature such that deoxygenation of the pyrolysis products to at least partially deoxygenated pyrolysis products takes place, and (d) collecting deoxygenated pyrolysis products in a separation device in which product separation takes place. An INDEPENDENT CLAIM is also included for the pyrolysis gas and/or pyrolysis oil produced using the above method.