Chinese Journal of Catalysis ›› 2016, Vol. 37 ›› Issue (9): 1502-1512.DOI: 10.1016/S1872-2067(16)62453-1

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Sustainable synthesis of ammonium nickel molybdate for hydrodesulfurization of dibenzothiophene

Huan Liua,b, Changlong Yina, Hongyu Zhanga, Chenguang Liua   

  1. a. State Key Laboratory of Heavy Oil Processing and Key Laboratory of Catalysis of CNPC, China University of Petroleum(East China), Qingdao 266580, Shandong, China;
    b. State Key Laboratory of Safety and Control for Chemicals, Sinopec Safety Engineering Institute, Qingdao 266071, Shandong, China
  • Received:2016-03-30 Revised:2016-05-06 Online:2016-09-21 Published:2016-09-21
  • Contact: Chenguang Liu
  • Supported by:

    This work was supported by the National Natural Science Fundation of China(U1162203, 21106185) and the Fundamental Research Funds for the Central Universities(15CX02023A, 15CX06051A). Financial support from Petr℃hina Corporation Limited was also greatly appreciated.

Abstract:

This paper reports a sustainable, water-assisted, solid-state method for synthesizing ammonium nickel molybdate((NH4)HNi2(OH)2(MoO4)2, ANM), a precursor for an unsupported hydrodesulfurization(HDS) catalyst. The associated ANM formation mechanism is also discussed. The synthesis route consists of physical mixing of the raw materials, water-assisted grinding and heating. The formation mechanism involves replacement of a Mo atom by a Ni atom, generating the metastable intermediate(NH4)4(NiH6Mo6O24)·5H2O. Heating of this intermediate at 120℃ removes the added water and produces ANM. Catalysts prepared by this method exhibit almost the same physicochemical properties and catalytic performance during the HDS of dibenzothiophene as materials made from ANM synthesized by a chemical precipitation procedure. Compared with traditional hydrothermal or chemical precipitation methods, this water-assisted, solid-state synthesis provides several significant advantages, including simplifying the synthetic procedure, reducing waste and energy costs and increasing product yields. These features will be highly important with regard to allowing the application of ANM in industrial-scale processes involving HDS reactions. This waterassisted, solid-state strategy can also be extended to the synthesis of isomorphous compounds such as ammonium cobalt(zinc and copper) molybdate.

Key words: Hydrodesulfurization, Solid-state reaction, Water-assisted grinding, Ammonium nickel molybdate, Unsupported catalyst