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Syngas to lower olefins over bulk Mo 2 N catalysts prepared with citric acid
Author(s) -
Zaman Sharif F.,
Alzahrani Abdulrahim A.,
Podila Seetharamulu,
Al Hamed Yahia
Publication year - 2020
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.2516
Subject(s) - catalysis , selectivity , olefin fiber , citric acid , chemistry , space velocity , hydrocarbon , crystallite , fischer–tropsch process , inorganic chemistry , syngas , nuclear chemistry , organic chemistry , crystallography
Herein, we report on the activity and selectivity of bulk γ‐Mo 2 N catalysts for Fischer–Tropsch lower olefin (FTO) synthesis. An increase in surface area and a decrease in crystallite size were observed for γ‐Mo 2 N catalysts prepared with the increased molar amount of citric acid (CA), used as a chelating agent during the catalyst synthesis. The reaction products were mainly C 2 –C 3 hydrocarbons in the temperature range of 230–300°C at 2 MPa with a reactant feed composition of CO:H 2 :Ar = 42.7:34.6:20.8 and a gas hourly space velocity (GHSV) of 1.3 mol/(g cat .h). The catalytic activity of the γ‐Mo 2 N catalysts increased with increased CA:Mo molar ratio and with temperature. However, the hydrogenation activity of the catalysts also increased, resulting in increased selectivity to paraffins. Selectivity to olefins prefers low CA:Mo, that is, low surface area and large crystallite size of γ‐Mo 2 N. The γ‐Mo 2 N catalyst prepared with a CA:Mo ratio of 1 had 56.4 C atom% C 2+ hydrocarbon selectivity, 62.4% of which was olefin with 37.8 C atom% selectivity to propylene at 275°C.