▎ 摘　　要

NOVELTY - Preparing optionally substituted monocyclic aromatic hydrocarbons from optionally substituted furan, comprises: contacting organic phase containing optionally substituted furan as raw material and ethylene with a molecular sieve catalyst to obtain optionally substituted monocyclic aromatic hydrocarbon, where the molecular sieve catalyst is SCM-X molecular sieve optionally doped with metal element (A), where the metal element is tin, zirconium and aluminum, and X is 14 or 15. USE - The method is useful for producing: aromatic hydrocarbon from furan; toluene from methyl furan; p-xylene from 2,5-dimethylfuran; and p-xylene from biomass (all claimed). ADVANTAGE - The method converts biomass from p-xylene without adding acid, uses catalyst having good cycle stability, solves problems of low catalytic efficiency, long reaction steps, high cost, environmental pollution and other problems, is simple to operate, has high product selectivity, good catalyst stability, easy product separation, few reaction steps, and short time, realizes the green and efficient conversion of biomass, does not use acid catalyst, which avoids the problems of corrosion of equipment, environmental pollution, and high treatment costs caused by acid, can efficiently and selectively promote the production of p-xylene from biomass, does not need to separate 2,5-hexanedione, and adopts with a specific molecular sieve catalyst. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: preparing p-xylene, comprising contacting an organic phase containing 2,5-hexanedione and ethylene with molecular sieve catalyst to produce p-xylene, where The SCM-X molecular sieve is silicon oxide-germanium dioxide compound of formula (mSiO2.nGeO2) (I); and converting biomass to prepare p-xylene, comprising (1) contacting and reacting biomass raw materials and hydrophobic hydrogenation catalyst in a biphasic solvent system comprising organic solvent phase and aqueous solution phase using hydrogen as hydrogen source, and separating the obtained product to obtain an organic phase containing 2,5-hexanedione, where the pH of the aqueous solution is 6.5-8.5, preferably 7-8, and (2) contacting and reacting organic phase containing 2,5-hexanedione and ethylene with a molecular sieve catalyst to prepare p-xylene. m/n=1-30, preferably 2-10.