Improvement of the pyrolysis products of oily sludge: Catalysts and catalytic process

This paper introduces the composition and hazard characteristics of oily sludge. Combining energy recovery and environmental protection, pyrolysis has been proven to be a potential technology. To further recover resources and reduce environmental risks, catalytic pyrolysis of oily sludge has attracted extensive attention. This work first discusses the advantages and disadvantages of the two chief types of catalytic pyrolysis reactors. Next, the effects of four major categories of catalysts employed in oily sludge pyrolysis on the quality of products are summarized and discussed. In addition, the disposal methods of spent catalysts are also introduced. Finally, the challenges and future research trends of catalysts are expected. The disposal methods of spent catalysts have also been outspread to avoid the waste of resources and secondary pollution caused by spent catalysts.