【作者】 陈进富； 俞英； 蔡卫权；

【Author】 Chen Jinfu Yu ying Cai Weiquan (Instiute of Chemical Engineering, University of Petroleum, Beijing)

【机构】 石油大学化工学院；

【摘要】 利用吡啶吸附-IR、NH₃吸附-脱附、原位热重积炭、DSC等技术并结合甲基环己烷（MCH）脱氢活性试验,研究了K₂O对工业Pt-Sn/Al₂O₃催化剂的表面酸性及MCH脱氢稳定性的影响。结果表明,K₂O能有效地调变催化剂的表面酸性,降低其表面酸中心特别是强酸中心的数目;MCH脱氢反应的积炭量随K₂O含量的增加而减少,但催化剂的高温脱氢稳定性与K₂O含量并不完全呈顺变关系,K₂O含量应严格控制,当K₂O含量为0.4w％时催化剂的高温稳定性可取得较满意的结果。更多还原

【Abstract】 This article deals with the influences of K2O on the acidity and MCH dehydrogenation stability of industry Pt-Sn/Al2O3 catalyst by pyridine-IR, adsorption and desorption of NH3 ,thermogravimetry(TG),DSC and MCH dehydrogenation. The results show that almost all of the acid sites on the surface of the industry catalyst is Lewis type. The total number of acid sites, especially the number of acid sites with strong acidity and the rate of carbon deposition on the surface of Pt-Sn/Al2O3 catalyst all decrease when the K2O content increases. But MCH dehydrogenation stability in the reaction condition: 0.12 Mpa, 500℃ , N2/MCH(mol)=3:1, WHSV=6h-1 only increases when K2O 0.4 to 1.0 w%. The role of K2O is to modify or to neutralize all the acid sites and is partially to cover the active center of Pt-Sn/Al2O3 catalyst.更多还原