期刊
APPLIED CATALYSIS A-GENERAL
卷 545, 期 -, 页码 104-112出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2017.07.036
关键词
Vapor-phase transport (VPT); Tetrapropylammonium hydroxide (TPAOH); ZSM-5; SiC foam; Structured catalyst; Methanol-to-propylene (MTP); Thermal conductivity
资金
- National 863 Program of China [2012AA030304]
- Engineering and Physical Sciences Research Council [EP/R000670/1]
- China Scholarship Council (CSC) [201604910181]
- University of Manchester
- EPSRC [EP/R000670/1] Funding Source: UKRI
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 zeolitic 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 x 10(-2) wt.% h(-1)) due to the enhanced transport phenomena within the developed structured catalyst.
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