NOVELTY - Preparing one or more fluid hydrocarbon products from a hydrocarbonaceous material comprises: feeding the material to a reactor; pyrolyzing within the reactor at least a portion of the material under reaction conditions sufficient to produce one or more pyrolysis products; catalytically reacting within the reactor at least a portion of the pyrolysis products to produce fluid hydrocarbon products comprising olefins and aromatics; separating at least a portion of the olefins in the fluid hydrocarbon products to produce a recycle stream; and feeding the recycle stream to the reactor.    USE - The process is useful for producing fluid hydrocarbon products, preferably biochemicals such as biofuel, aromatic compounds (e.g. benzene, toluene, naphthalene and xylene), and olefin compounds.    ADVANTAGE - The zeolite catalyst used in the process improves yield and/or selectivity of products. The process is economical for the production of useful biofuels. The process provides higher yields of desired product; lower yields of coke formation; and/or more controlled product formation (e.g. higher production of aromatics and/or olefins relative to other products).    DETAILED DESCRIPTION - Preparing one or more fluid hydrocarbon products from a hydrocarbonaceous material comprises: either feeding a hydrocarbonaceous material to a reactor, pyrolyzing within the reactor at least a portion of the hydrocarbonaceous material under reaction conditions sufficient to produce one or more pyrolysis products, catalytically reacting within the reactor at least a portion of the one or more pyrolysis products under reaction conditions sufficient to produce one or more fluid hydrocarbon products comprising olefins and aromatics, separating at least a portion of the olefins in the fluid hydrocarbon products to produce a recycle stream comprising at least the separated olefins, and a product stream, and feeding at least a portion of the recycle stream to the reactor; or providing a hydrocarbonaceous material and one or more catalysts comprising many particles having maximum cross-sectional dimensions of less than 1 micron, pyrolyzing at least a portion of the hydrocarbonaceous material under reaction conditions sufficient to produce one or more pyrolysis products, and catalytically reacting at least a portion of the pyrolysis products with the catalysts to produce the one or more hydrocarbon products.