Investigation of Sulfur-Tolerant Catalysts for Selective Synthesis of Hydrocarbon Liquids from Coal-Derived Gases. Quarterly Technical Progress Report, September 18-December 18, 1979

摘要

Three catalysts were prepared: 3% Co/SiO sub 2 , 3% Fe/SiO sub 2 , and a 10% cobalt boride on alumina designated respectively as Co-S-101, Fe-S-100, and CoB-A-101. These catalysts were prepared in the following manner: analytically pure Co(NO sub 3 ) sub 2 . 6H sub 2 O and Fe(NO sub 3 ) sub 3 . 9H sub 2 O salts and commercial Cab-O-Sil silica were used to prepare the 3% silica-supported cobalt and iron catalysts. Samples were prepared by simple impregnation to incipient wetness with aqueous metal salt solutions. Several impregnations were necessary to ensure a uniform deposition of the metal salt, each followed by intermediate drying. After the final impregnation, the catalysts were dried in an oven at 355 to 375 exp 0 K for 24 h. These dried samples were then bulk reduced in flowing hydrogen at a space velocity of 2000 h exp -1 . The temperature was raised during reduction at a rate of 1.5 to 2.0 K/min until 725 exp 0 K was attained, then held for 12 h. The reduced catalysts were next passivated with 1% air in nitrogen and crushed to a fine powder for use. The cobalt boride on alumina catalyst (CoB-A-101) was prepared under an N sub 2 blanket in a sealed reaction vessel to avoid the formation of boron oxide, which cannot be reduced in flowing H sub 2 even at 675 exp 0 K. Enough alumina was used so that if all the cobalt adhered to the support 18 wt % metal loading would result. From previous experience we estimate a loading of about 10 wt %; this is currently being checked by chemical analysis. (ERA citation 05:025165)