Vapor-phase transport (VPT) modification of ZSM-5/SiC foam catalyst using TPAOH vapor to improve the methanol-to-propylene (MTP) reaction

Yilai Jiao, Xiaolei Fan, Michal Perdjon, Zhenming Yang, Jinsong Zhang
2017 Applied Catalysis A : General  
Keywords: Vapor-phase transport (VPT) Tetrapropylammonium hydroxide (TPAOH) ZSM-5 SiC foam Structured catalyst Methanol-to-propylene (MTP) Thermal conductivity A B S T R A C T Tetrapropylammonium hydroxide (TPAOH) was introduced in the vapor phase to perform the vapor-phase transport (VPT) modification of the structured ZSM-5 supported on SiC foam (ZSM-5/SiC foam) catalyst. An optimum precursor concentration of 0.5 M TPAOH could effectively convert the amorphous aluminosilicate binder to the
more » ... litic phase with improved intracrystal mesopores, nanosized crystals (ca. 100 nm), high concentration of acidity sites (83 mmol g −1 ) as well as a high value of the relative acidity (0.7). Combined with the intrinsic property of macroscopic SiC foams such as the low pressure drop and the high thermal conductivity (14 W m −1 K −1 at 773 K), TPAOH VPT modified ZSM-5/SiC foam catalyst demonstrated an excellent activity in the catalytic methanol-to-propylene (MTP) reaction, surpassing the state-of-the-art hierarchal ZSM-5 monolith catalyst. The catalyst showed an extended activity for ca. 970 h (> 95% methanol conversion) with the high selectivity to the propylene (> 45%). The coke formation was significantly retarded (ca. 2.1 × 10 −2 wt.% h −1 ) due to the enhanced transport phenomena within the developed structured catalyst.
doi:10.1016/j.apcata.2017.07.036 fatcat:2hipkdgc25c4xblnfps2b35av4