Two different types of dehydrocyclization (DHC) active site, i. e. high temperature active site and low temperature active site, over Pt-Al2O3 catalyst were evidenced by temperature programmed surface reaction method.

• 用程序升温表面反应法证明在Pt-Al_2O_3催化剂上存在高温和低温两种脱氢环化活性中心。