Highly active unsupported sulfide catalysts prepared from hydrothermal synthesis: Comparative study of Mo and CoMo or NiMo sulfide catalysts

PETR 3

Boonyawan Yoosuk, bxy6@psu.edu1, Jae Hyung Kim, jxk63@psu.edu1, Chunshan Song, csong@psu.edu2, Chawalit Ngamcharussrivichai3, and Pattarapan Prasassarakich, Pattarapan.P@Chula.ac.th3. (1) Clean Fuels and Catalysis Program, The Energy Institute and Department of Energy and Geo-Environmental Engineering, The Pennsylvania State University, 209 Academic Projects Building, University Park, State College, PA 16802, (2) Clean Fuels and Catalysis Program, The Energy Institute, and Department of Energy & Geo-Environmental Engineering, Pennsylvania State University, 209 Academic Projects Building, University Park, PA 16802, (3) Department of Chemical Technology, Chulalongkorn University, Faculty of Science, Bangkok, Thailand
A comparative study of unsupported MoS2 and Me/MoS2 (Me=Co, Ni) catalysts prepared by a hydrothermal synthesized method developed in our laboratory is herein reported. BET showed that unsupported Mo sulfide catalyst prepared by hydrothermal method has high surface area. The addition of promoters (Ni and Co) decreased significantly surface area and pore volume of unsupported Mo sulfide. HRTEM result is consistent with XRD pattern that promoters prevent the growth and aggregation of MoS2 microdomains. The simultaneous HDS of DBT and 4,6-DMDBT were used to study the promoter effect of Co or Ni on the HDS activity of unsupported MoS2 catalyst. Surprisingly, 4,6-DMDBT is slightly more active than DBT over unsupported MoS2 catalyst. However, as generally observed, on the unsupported CoMo and NiMo catalyst, DBT was much active than 4,6-DMDBT. Unlike most catalysts reported in literature, 4,6-DMDBT is not much less reactive than DBT over all of the unsupported catalysts prepared by our method. It was therefore concluded that the main effect of the promoter on the HDS of DBT type molecules was to increase the rate of the C–S bond cleavage provided this reaction was not hindered by steric constraints.
 

2nd International Symposium on Hydrotreating/Hydrocracking Technologies
8:30 AM-11:50 AM, Sunday, 10 September 2006 Palace -- Presidio Room, Oral

Division of Petroleum Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006