The enhancement of catalytic activity of Ce4+-doped SO42-/TiO2 catalyst increase because of the Lewis sourness and the number of active site of it increase owing to the Ce doping.

• 同时Ce4+的掺杂增强了催化剂Lewis酸性和提高催化剂表面与活性物种SO42-的配位能力从而增加催化剂表面活性中心的数目；这是提高催化剂活性的主要原因之一.