ISSN:
1573-9171
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Summary 1. Addition of alumina to an impregnation catalyst of NiO on KSK silica gel prepared from nickel formatehas a strong activating effect on the catalyst for the polymerization of ethylene. 2. With change in the concentration of the aluminum nitrate solution used for the preparation of an NiO-Al2O3-KSK silica gel catalyst from 0.5% to 10% there is little change in the activity of the latter; lower concentrations give a catalyst of low activity. 3. Alumina, kieselguhr, various kinds of clay, and activated charcoal are not suitable as carriers for nickelous oxide as a catalyst for the polymerization of ethylene. 4. The precipitation catalyst NiO-Al2O3-KSK silica gel, prepared from the nitrate by precipitation with potassium carbonate is inactive, and that prepared by precipitation with ammonia is active, but of inadequate stability and regenerability. Addition of zinc oxide somewhat raises the regenerability and the selectivity with respect to the dimerization of ethylene. CatalystNo. Catalyst Expt.No. C2H4 reacted,% Butene yield (%) Yield of higher Hydrocarbons, % onC2H4passed onC2H4reacted onC2H4passed onC2H4reacted 81 NiO-Al2O3-KSK 1 34,4 22,0 64,0 3,4 10,1 83 NiO-KSK 1 12,7 7,6 58,0 3,3 25,4 232 NiO-Al2O3-KSK (pptd. With K2CO3) 1 0,0 0,0 0,0 0,0 0,0 225 NiO-Al2O3-KSK (pptd. with ammonia) 1–2 43,0–29,5 27,0–18,7 63,0–63,6 5,3–2,7 12,1–9,0 225 The same 3*–4 26,8–18,0 15,0–10,0 55,8–56,0 2,8–2,3 11,2–14,0 225 * * 5* 20,9 9,8 47,3 2,4 11,6 225 * * 6* 20,0 13,0 66.7 2,0 10,3 225 * * 7* 11,1 9,7 82,3 1,4 14,0 226 * * 1–2 35,–12,4 23,0–5,0 66,5–40,0 3,0–1,4 8,7–11,6 226 * * 3* 20,6 13,9 67,5 2,4 11,7 226 * * 4* 23,7 17,9 75,0 2,2 9,5 226 * * 5* 13,0 7,4 55,0 0,7 5,4 227 NiO-ZnO-Al2O3-KSK 1–2 27,0–22,0 15,1–16,5 55,7–74,7 3,1–2,3 12,6–10,5 227 The same 3 14,6 6,6 45,4 1,5 10,0 227 * * 4* 20,3 17,2 84,8 2,8 16,0 228 * * 1–2 24,0–13,4 15,5–7,4 64,5–55,0 2,4–1,5 10,0–10,8 228 * * 3* 27,8 16,3 58,8 2,9 10,5 228 * * 4* 25,8 19,4 75,0 3,4 13,3 * Before this experiment the catalyst was regenerated in a stream of air at 450° for five hours.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01178713
Permalink
