Size-Dependent Kinetics Determination of Mos2-K2o/Cnts Nanocatalyst in the Synthesis of Alcohols From Syngas

The influence of mo particle size on the catalytic activity and product selectivity of alkalized mos2nanocatalysts has been investigated. nanocatalysts are prepared using a microemulsion techniquewith water-to-surfactant ratios of 1-12. three different techniques, including xrd, tem, andhydrogen chemisorption were used to determine the molybdenum average particle size and theiractivity and selectivity in higher alcohols synthesis (has) carried out in a fixed bed microreactor at330 °c and 70 bar. to fix the percentage of co conversion, the ghsv is changed from 3.6 to 2.57(nl/(hr.g catalyst)). the average mos2 particle sizes are changed from 4.5 to 11.9 nm. theexperimental results showed that changing particle size from 11.9 to 4.5 nm decreased themethanol formation rate from 0.00634 to 0.00534 (mol/(hr.g catalyst)) but increased ethanolformation rate from 0.00581 to 0.00787 (mol/(hr.g catalyst)) and higher alcohols formation ratefrom 0.00473 to 0.00657 (mol/(hr.g catalyst)). a size-dependent kinetics model was developed tocalculate the alcohol formation rates versus catalyst average particle size. the model not onlymatched experimental and theoretical results, but also showed that mos2 catalyst had sizedependentstructure and for the prediction of product selectivity it was easier to use thismathematical model