Mixed Alcohol Synthesis from Syngas on K–Co–Mo/C Catalyst Prepared by a Sol–Gel Method
Tóm tắt
A kind of K–Co–Mo/C catalyst with homogenous components distribution and small particle size was prepared by sol–gel method with citric acid as complexant. Its structure and catalytic performance for mixed alcohol synthesis were investigated. By heat treating the dried gel in argon, the decomposition of citric acid resulted in the formations of amorphous carbon and low-valence MoO2 species. The incorporation of potassium and cobalt increased significantly the alcohol synthesis activity, especially improved the C2+OH selectivity. The optimal atomic composition of catalyst was: 0.10 K: 0.50 Co: 1.0 Mo. Comparing with the similar catalysts reported in literatures, the sol–gel derived K–Co–Mo catalyst showed better performance, especially much higher C2+OH selectivity for mixed alcohol synthesis. A 150 h reaction test indicated that the catalyst had good stability during the entire experimental period. It suggested that the homogenous components distribution and small particle size enhanced the synergistic effect of promoters and created more active species, leading to a high catalytic performance. The formation of MoO2 species was also favorable to improve the catalytic activity because the low-valence Mo4+ was known to be more active in CO hydrogenation.
Tài liệu tham khảo
Satterfield CN (1991) Heterogeneous catalysis in industrial practice, 2nd edn. McGraw-Hill, New York, p 454
Xu X, Doesburg EBM, Scholten JJF (1987) Catal Today 2:125
Tatsumi T, Muramatsu A, Tominaga H (1984) Chem Lett 13:685
Zhang HB, Yang YQ, Huang HP, Lin CD, Tsai KR (1992) In: Preprint and abstract book of 10th international congress on catalysis, Busapest, Hungary, p 253, 19–24 July 1992
Fu YL, Fujimoto K, Lin PY, Omata K, Yu YS (1995) Appl Catal A 126:273
Jiang M, Bian GZ, Fu YL (1994) J Catal 146:144
Li ZR, Fu YL, Jiang M (1999) Appl Catal A 187:187
Zhang Y, Zhong B (2000) Chin J Fuel Chem Technol 28:111
Zhang Y, Sun YH, Zhong B (2001) Catal Lett 76:249
Tatsumi T, Muramatsu A, Fukunaga T, Tominaga H (1986) Chem Lett 15:919
Tatsumi T, Muramatsu A, Fukunaga T, Tominaga H (1988) In: Philips MJ, Ternan M (eds) Prodeedings of 9th international congress on catalysis, Calgary, vol 2. Chemical Institute of Canada, Ottawa, p 618
Storm DA (1995) Top Catal 2:91
Bian GZ, Fu YL, Ma YS (1999) Catal Today 51:187
Yoshimura Y, Matsubayashi N, Sato T, Shimada H, Nishijima A (1991) Appl Catal A 79:145
Bao J, Bian GZ, Fu YL (1999) Chin J Catal 20(6):645
Fujimoto K, Oba T (1985) Appl Catal 13:289
Bao J, Fu YL, Sun ZH, Gao C (2003) Chem Comm 6:746
Stevens RR (1989) US Patent 4,882,360
Cochran GA, Quarderer GJ (1988) US Patent 4,749,724
Muramatsu A, Tatsumi T, Tominaga H (1987) Bull Chem Soc Jpn 60:3157
Pretzer WR, Habib MM (1984) In: Hermann RG (ed) Catalytic conversions of synthesis gas and alcohols to chemicals, Plenum, New York, p 261
Saito M, Anderson RB (1980) J Catal 63:438
Muramatsu A, Tatsumi A, Tominaga H (1992) J Phys Chem 96:1334