提高甲烷芳构化催化剂强度的成型工艺研究
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摘要
采用室温浸渍旋蒸工艺制备Mo/HZSM-5甲烷芳构化催化剂,制备的催化剂粉体在无粘结剂的条件下进行喷雾成型。通过对喷雾成型过程中的影响因素进行考察,得出最佳喷雾成型条件,即在浆料配比为催化剂固含量40%,PVA加入质量分数1%,进料速度为70mL/min,干燥进风口温度220～230℃,出口温度100～105℃,雾化器变频器频率为70Hz的条件下,在此条件下可以得到符合粒径要求且收率相对较高的成型催化剂。成型后的催化剂经过干燥和焙烧即得到成品催化剂,催化剂的装置评价结果表明,采用此方法所得到的催化剂甲烷转化率和总芳烃选择性高,磨损指数低。
The methane dehydroaromatization catalyst Mo/HZSM-5 was prepared by a room temperature impregnation-rotary evaporation process, and the prepared catalyst powder was shaped without binder. The influencing factors in the spray shaping were investigated, and the optimal spray shaping conditions were obtained as follows: the catalyst solid content in the slurry of 40% by mass, the PVA content of 1% by mass, the feed rate of 70 mL/min, the tuyere temperature and air outlet temperature for dryingof 220-230℃ and 100-105℃ respectively, and the nebulizer frequency converter of 70 Hz. Underabove conditions, the shaped catalyst could meet the particle size requirement and has a relatively high yield. The shaped catalyst was dried and calcined to obtain a finished catalyst. The evaluation results of the catalyst exhibited higher methane conversion and total aromatics selectivity and lower wear index.
The methane dehydroaromatization catalyst Mo/HZSM-5 was prepared by a room temperature impregnation-rotary evaporation process, and the prepared catalyst powder was shaped without binder. The influencing factors in the spray shaping were investigated, and the optimal spray shaping conditions were obtained as follows: the catalyst solid content in the slurry of 40% by mass, the PVA content of 1% by mass, the feed rate of 70 mL/min, the tuyere temperature and air outlet temperature for dryingof 220-230℃ and 100-105℃ respectively, and the nebulizer frequency converter of 70 Hz. Underabove conditions, the shaped catalyst could meet the particle size requirement and has a relatively high yield. The shaped catalyst was dried and calcined to obtain a finished catalyst. The evaluation results of the catalyst exhibited higher methane conversion and total aromatics selectivity and lower wear index.
引文
[1]张晓琳.分子筛催化剂成型条件对其抗压强度影响的研究[J].精细石油化工进展, 2012, 13(6):42-44.
[2]王涛,刘志玲,张菊,等.甲烷无氧芳构化反应最新研究进展[J].天然气化工—C1化学与化工, 2018, 43(2):127-134.
[3]张伟,张华,张书勤,等.一种提高分子筛催化剂强度的无粘结剂喷雾成型工艺[P]. CN:108479858A, 2018-09-04.
[4]Master's K.喷雾干燥手册[M].北京:中国建筑工业出版社, 1983:171.
[5]Li X J, Zhang W P, Liu S L, et al. The role of alumina in the supported Mo/HBeta-Al2O3catalyst for olefin metathesis:A high-resolution solid-state NMR and electron microscopy study[J]. J catal, 2007, 250:55-66.
[6]胡晓丽,姚文君,王书峰,等.成型工艺条件对加氢脱硫催化剂载体机械强度的影响[J].当代化工, 2013, 42(2):135-140.
[7]赵野,骆傲阳,于开荣,等.影响分子筛催化剂强度因素的探讨[J].石油炼制与化工, 1995, 26(3):26-29.
[8]王桂茹,韩翠英,王祥生等.催化剂成型条件对催化剂性能的影响[J].辽宁化工, 1990,(2):6-9.
[9]朱洪法.催化剂成型[M].北京:中国石化出版社, 1992:39-55.
[10]张晓琳,王俊艳,曹志涛.分子筛催化剂成型条件对其抗压强度的影响[J].精细石油化工进展, 2012, 13(7):38-41.
[11]马广伟,张惠明.无黏结剂流化床催化剂的制备方法[P].CN:102371183A, 2012-03-14.
[12]皮秀娟,盛毅.氧化铝载体成型工艺条件研究[J].石油炼制与化工, 2014, 45(7):47-51.
[2]王涛,刘志玲,张菊,等.甲烷无氧芳构化反应最新研究进展[J].天然气化工—C1化学与化工, 2018, 43(2):127-134.
[3]张伟,张华,张书勤,等.一种提高分子筛催化剂强度的无粘结剂喷雾成型工艺[P]. CN:108479858A, 2018-09-04.
[4]Master's K.喷雾干燥手册[M].北京:中国建筑工业出版社, 1983:171.
[5]Li X J, Zhang W P, Liu S L, et al. The role of alumina in the supported Mo/HBeta-Al2O3catalyst for olefin metathesis:A high-resolution solid-state NMR and electron microscopy study[J]. J catal, 2007, 250:55-66.
[6]胡晓丽,姚文君,王书峰,等.成型工艺条件对加氢脱硫催化剂载体机械强度的影响[J].当代化工, 2013, 42(2):135-140.
[7]赵野,骆傲阳,于开荣,等.影响分子筛催化剂强度因素的探讨[J].石油炼制与化工, 1995, 26(3):26-29.
[8]王桂茹,韩翠英,王祥生等.催化剂成型条件对催化剂性能的影响[J].辽宁化工, 1990,(2):6-9.
[9]朱洪法.催化剂成型[M].北京:中国石化出版社, 1992:39-55.
[10]张晓琳,王俊艳,曹志涛.分子筛催化剂成型条件对其抗压强度的影响[J].精细石油化工进展, 2012, 13(7):38-41.
[11]马广伟,张惠明.无黏结剂流化床催化剂的制备方法[P].CN:102371183A, 2012-03-14.
[12]皮秀娟,盛毅.氧化铝载体成型工艺条件研究[J].石油炼制与化工, 2014, 45(7):47-51.