Direct synthesis of LPG from carbon dioxide over hybrid catalysts comprising modified methanol synthesis catalyst and B-type zeolite
Abstract
Hydrogenation of carbon dioxide to C3 and C4 paraffins (LPG) was studied by using hybrid catalysts composed of Zr-modified Cu–Zn catalyst with Pd-modified zeolite. Various factors that affect catalyst activity, including reaction temperature, space velocity, pressure, and the ratio of H2 to CO2 were investigated thoroughly. The hybrid catalysts exhibited stable activity over 100 h and extraordinary high selectivity of LPG synthesis (especially iso-butane) even under low temperature (260◦C) and low pressure (2 MPa). Conversion of CO2 and the yield of hydrocarbon reached 25.2% and 13.3%, respectively, while keeping the selectivity of LPG and CH4 75% and 1%, respectively. The iso-butane/n-butane ratio was about 16/1, whose value was much higher than that of thermodynamic equilibrium (about 1/1).
Reference
Congming Li, Xingdong Yuan, Kaoru Fujimoto (2014). Direct synthesis of LPG from carbon dioxide over hybrid catalysts comprising modified methanol synthesis catalyst and B -type zeolite. Applied Catalysis A: General, 475, 155–160.
Results and findings
- Hybrid catalysts consisting of Zr modified Cu–Zn catalyst with Pd-modified zeolite were found to show high and stable conversion for CO2 hydrogenation.
- The stable activity of CO2 conversion can be attributed to the high water resistant of CZZA.
-The hybrid catalyst consisting of CZZA with Pd-B was effective for LPG synthesis with selectivity as high as 75% and with little methane formation.
- The Catalytic activity was stable over 100 h.
Citations
- Congming Li, Xingdong Yuan, Kaoru Fujimoto (2014) reported that The conversion carbon dioxide to LPG over B-type zeolite catalyst (155-160).
- According to Congming Li, Xingdong Yuan, Kaoru Fujimoto (2014), Direct synthesis of LPG from carbon dioxide by using hybrid catalysts comprising modified methanol synthesis B- type zeolite catalyst (155-160).
