Synthesis of transition metal arsenides and arsenic metal sulfides and their role in the dearsenation of shale oils

Journal Article · Fri Apr 01 00:00:00 EST 1994 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1006/jssc.1994.1095· OSTI ID:7028474

Singhal, G H; Brown, L D; Ryan, D F ^[1]

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1. Exxon Research Development Laboratories, Baton Rouge, LA (United States)

One of the chief problems in upgrading shale oil is the presence of inherent arsenic, which is known to poison downstream catalysts. Highly dispersed transition metal sulfides formed in situ from the decomposition of dithiocarbamate (DTC) complexes of transition metals show excellent potential as dearsenation agents. The authors have studied the reaction of these sulfides with various arsenic compositions, and characterized the metal arsenides and arsenic metal sulfides formed as well as the ease of their formation. Thus, the reaction of bis(butyldithiocarbamato)Ni, (NiBuDTC), with model compounds was very facile and gave NiAs, NiAsS, and NiAs[sub 2[minus]x]S[sub x]. In general, the effectiveness of the sulfides for dearsenation followed the sequence Ni > Mo [much gt] Co, while iron sulfides were totally ineffective. Based upon these results, tests where run in autoclaves (as well as a fixed-bed flow-through unit) with Ni BuDTC and shale oil having 73 ppm inherent As. Under optimum conditions, dearsenation down to less than 1 ppm was obtained.

• OSTI ID: 7028474
• Journal Information: Journal of Solid State Chemistry; (United States), Vol. 109:2; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ARSENIC
REMOVAL
SHALE OIL
PURIFICATION
CHEMICAL PREPARATION
COBALT SULFIDES
IRON SULFIDES
MOLYBDENUM SULFIDES
NICKEL ARSENIDES
NICKEL SULFIDES
ARSENIC COMPOUNDS
ARSENIDES
CHALCOGENIDES
COBALT COMPOUNDS
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
IRON COMPOUNDS
MOLYBDENUM COMPOUNDS
NICKEL COMPOUNDS
PNICTIDES
REFRACTORY METAL COMPOUNDS
SEMIMETALS
SULFIDES
SULFUR COMPOUNDS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
040403* - Oil Shales & Tar Sands- Refining
400201 - Chemical & Physicochemical Properties