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ＰｔＳｎ／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。
This article deals with the influences of K 2O on the acidity and MCH dehydrogenation stability of industry PtSn/Al 2O 3 catalyst by pyridineIR, adsorption and desorption of NH 3, 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 PtSn/Al 2O 3 catalyst all decrease when the K 2O content increases But MCH dehydrogenation stability in the reaction condition: 0 12MPa, 500℃, N 2/MCH(mol)=3∶1, WHSV=6h 1 only increases when K 2O content changes from 0 to 0 4w% and decreases when K 2O amount is added from 0 4 to 1 0w% The role of K 2O is to modify or to neutralize all the acid sites and is partially to cover the active centre of PtSn/Al 2O 3 catalyst
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1998年第6期543-547,共5页
Journal of Fuel Chemistry and Technology
关键词
脱氢催化剂
氢燃料
甲基环己烷
MTH
储氢技术
dehydrogenation catalyst, acid sites, dehydrogenation stability, hydrogen fuel
