Premium
Hydrocarbon steam reforming using Silicalite‐1 zeolite encapsulated Ni‐based catalyst
Author(s) -
Cimenler Ummuhan,
Joseph Babu,
Kuhn John N.
Publication year - 2017
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.15521
Subject(s) - zeolite , catalysis , physisorption , steam reforming , chemical engineering , scanning electron microscope , chemistry , composite number , energy dispersive x ray spectroscopy , nuclear chemistry , materials science , organic chemistry , hydrogen production , composite material , engineering
A Silicalite‐1 zeolite membrane encapsulated 1.6 wt % Ni–1.2 wt % Mg/Ce 0.6 Zr 0.4 O 2 steam reforming composite catalyst synthesized by a physical coating method was used to investigate effect of encapsulation on size selective steam reforming, using methane (CH 4 ) and toluene (C 7 H 8 ) as representative species. Characterization methods (scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Physisorption Analysis, and x‐ray diffraction (XRD)) were used to analyze pre‐ and post‐reaction samples. SEM, EDS, and XRD analyses showed that Silicalite‐1 was coated successfully onto the core catalyst. Weisz‐Prater Criteria and Thiele moduli calculations indicated internal diffusion limitations. Combined reforming of CH 4 and C 7 H 8 at 800°C on the composite catalyst demonstrated stability during the 10 h time on stream while the uncoated SR catalyst deactivated. The non‐acidic Silicalite‐1 encapsulated catalyst showed decreases (∼2–7%) in both CH 4 and C 7 H 8 conversions compared to acidic H‐β zeolite confirming that shell acidity did contribute to conversion and suggested that shell defects/grain boundaries were responsible for the C 7 H 8 conversion. © 2016 American Institute of Chemical Engineers AIChE J , 63: 200–207, 2017