TY - JOUR
T1 - Synthesis, characterization, and catalytic performance of high-silica y zeolites with different crystallite size
AU - Zhao, Yuansheng
AU - Liu, Zhongqing
AU - Li, Wenle
AU - Zhao, Yusheng
AU - Pan, Huihua
AU - Liu, Yuandong
AU - Li, Minggang
AU - Kong, Lingjiang
AU - He, Mingyuan
PY - 2013
Y1 - 2013
N2 - High-silica NaY (SiO2/Al2O3 > 6.0) was synthesized without organic template in a novel, cheap, and relatively fast way by using as structure directing agent (SDA) a mixture of water glass, sodium aluminate, and sodium hydrate, which had been aged at low temperature. Liquid 27Al NMR characterization showed that the SDA nuclei aged at low temperature contained more silicon and were more stable than SDA prepared with the conventional method, thus inducing the formation of high-silica NaY during crystallization, as determined by XRD, XRF, and 29Si NMR. Particle size had a great effect on the structural stability of zeolite Y and catalytic cracking ability even at a high SiO2/Al2O3 ratio. In the cracking of vacuum gas oil, REY catalysts, made from high-silica NaY with crystallite size 300-500 nm, not only had higher cracking activity, but also higher gasoline and diesel yield and lower coke yield than a conventionally prepared sample. On the other hand, REY catalysts with crystallite size between 100 and 300 nm had a lower activity.
AB - High-silica NaY (SiO2/Al2O3 > 6.0) was synthesized without organic template in a novel, cheap, and relatively fast way by using as structure directing agent (SDA) a mixture of water glass, sodium aluminate, and sodium hydrate, which had been aged at low temperature. Liquid 27Al NMR characterization showed that the SDA nuclei aged at low temperature contained more silicon and were more stable than SDA prepared with the conventional method, thus inducing the formation of high-silica NaY during crystallization, as determined by XRD, XRF, and 29Si NMR. Particle size had a great effect on the structural stability of zeolite Y and catalytic cracking ability even at a high SiO2/Al2O3 ratio. In the cracking of vacuum gas oil, REY catalysts, made from high-silica NaY with crystallite size 300-500 nm, not only had higher cracking activity, but also higher gasoline and diesel yield and lower coke yield than a conventionally prepared sample. On the other hand, REY catalysts with crystallite size between 100 and 300 nm had a lower activity.
KW - Different crystallite size
KW - High-silica Y zeolite
KW - Structure directing agent
KW - VGO catalytic cracking
KW - Without organic template
UR - https://www.scopus.com/pages/publications/84871336451
U2 - 10.1016/j.micromeso.2012.03.016
DO - 10.1016/j.micromeso.2012.03.016
M3 - 文章
AN - SCOPUS:84871336451
SN - 1387-1811
VL - 167
SP - 102
EP - 108
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
ER -