微孔材料BET比表面积计算中相对压力应用范围的研究.pdfVIP

2006 11 Nov. 2006 14 11 INDUST RIA L CATALY SIS Vol. 14 No. 11 BET 梁 薇 ( , 100083) : 考察在不同相对压力范围应用BET 公式计算中孔材料含少量微孔材料及纯微孔材料的 表面积, 果表明, 应用BET 公式计算微孔材料的表面积时, 相对压力取值001~ 010, BET 线性 关系较为合理多数微孔材料相对压力取值在005~ 020 计算出的表面积比001~ 010 小有 少量的分子筛样品经水热老化处理后, 其等温线产生低压滞后环, 这类微孔材料在相对压力取值为 005~ 020 计算的表面积比001~ 010 大催化剂中微孔材料含量越多, 两个相对压力范围内 计算出的 果差别越大, 对于纯分子筛样品二者差值可达15% 左右 : 微孔材料; 相对压力; BET 比表面 : T Q426. 65; O647. 33 : A : 2006) Calculation of BET surface area of microporous materials at different relative pressure LIA N G Wei ( Sinope Resear h Institute of Petroleum Pro essing, Beijing 10083, China) Abstract: BET equation w as used to al ulate surfa e area of different pow der solids, su h as meso porous Al O and mi roporous zeolites, at different relative pressure( P / P ) . The results showed that 2 3 0 w hen relative pressure is in the range of 0. 01- 0. 10, surfa e area of mi roporous materials al ulated is more reliable. For most mi roporous materials, BET surfa e area al ulated at P / P = 0. 05- 0. 20 is 0 less than that at P / P0 = 0. 0 1- 0. 10. For some hydrothermallytreated ZSM5 samples, their isotherms have hysteresis loop at low er relative pressure; BET surfa e area al ulated at P / P 0= 0. 05 - 0. 20 is smaller that that al ulated at P / P0 = 0. 01- 0. 10. The more mi roporous material in the atalysts, the larger the differen e in BET surfa e area al ulated at the two relative pressure ranges. For some pure zeolites, this differen