Catalytic behavior in skeletal isomerization of linear butenes and acidic properties of an i -Pr 2 NH-templated sapo-11 molecular sieve

SAPO-11 samples were synthesized with i -Pr 2 NH as a novel template, and applied in catalytic skeletal isomerization of linear butenes. More linear butenes were converted with increasing Si content in SAPO-11 samples, while the iso -butene selectivity was proportional to the Si content only in the lower reaction temperature region. The maximum yield of iso -butene was achieved around 763 K. The acidic properties of SAPO-11 samples were studied by NH 3 -TPD and IR spectroscopy. The strong acidity was due to the formation of Si domains in the framework lattice.