Catalytically active and hierarchically porous SAPO-11 zeolite synthesized in the presence of polyhexamethylene biguanidine.
Hierarchically porous SAPO-11 zeolite (H-SAPO-11) is rationally synthesized from a starting silicoaluminophosphate gel in the presence of polyhexamethylene biguanidine as a mesoscale template. The sample is well characterized by XRD, N2 sorption, SEM, TEM, NMR, XPS, NH3-TPD, and TG techniques. The results show that the sample obtained has good crystallinity, hierarchical porosity (mesopores at ca. 10 nm and macropores at ca. 50-200 nm), high BET surface area (226 m(2)/g), large pore volume (0.25 cm(3)/g), and abundant medium and strong acidic sites (0.36 mmol/g). After loading Pt (0.5 wt.%) on H-SAPO-11 by using wet impregnation method, catalytic hydroisomerization tests of n-dodecane show that the hierarchical Pt/SAPO-11 zeolite exhibits high conversion of n-dodecane and enhanced selectivity for branched products as well as reduced selectivity for cracking products, compared with conventional Pt/SAPO-11 zeolite. This phenomenon is reasonably attributed to the presence of hierarchical porosity, which is favorable for access of reactants on catalytically active sites. The improvement in catalytic performance in long-chain paraffin hydroisomerization over Pt/SAPO-11-based catalyst is of great importance for its industrial applications in the future.
Key Lab of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University (XiXi Campus), Hangzhou 310028, PR China; Department of Chemical Engineering and Technology, East China Institute of Technology, Nanchang 330013, PR China.
Yan
Y
Liu
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, PR China.
Wei
W
Qu
Key Lab of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University (XiXi Campus), Hangzhou 310028, PR China.
Weiwei
W
Chang
Key Lab of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University (XiXi Campus), Hangzhou 310028, PR China.
Shuxiang
S
Pan
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, PR China.
Zhijian
Z
Tian
Key Lab of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University (XiXi Campus), Hangzhou 310028, PR China. Electronic address: mengxj@zju.edu.cn.
Xiangju
X
Meng
Shell Technology Centre Amsterdam (STCA), CW-01-07, Grasweg 31, 1031 HW Amsterdam, The Netherlands.
Marcello
M
Rigutto
Shell Technology Centre Amsterdam (STCA), CW-01-07, Grasweg 31, 1031 HW Amsterdam, The Netherlands.
Alexander
A
van der Made
Advanced Membranes and Porous Materials Center, Chemical and Life Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal 2955-6900, Saudi Arabia.
Lan
L
Zhao
Key Lab of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University (XiXi Campus), Hangzhou 310028, PR China.
Xiaoming
X
Zheng
Key Lab of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University (XiXi Campus), Hangzhou 310028, PR China. Electronic address: fsxiao@zju.edu.cn.
Feng-Shou
FS
Xiao
Hierarchical zeolite; Hydroisomerization; SAPO-11; Supported platinum catalyst; n-Dodecane