CaTi_(0.9)Li_(0.1)O_(3-δ)晶格中氧空位与选择性活性氧物种的TGA表征  

Characterization of Oxygen Vacancies and Selectivity Active Oxygen Species in CaTi 0.9 Li 0.1 O 3 δ by TGA

作　　者：陈铜[1] 张晋芬[1] 黄泰山[1] 罗广丰[1] 万惠霖[1] 

机构地区：[1]厦门大学化学系

出　　处：《厦门大学学报（自然科学版）》1999年第5期702-706,共5页Journal of Xiamen University：Natural Science

摘　　要：用常规 Ｔ Ｇ Ａ（程序升温热重分析）法间接表征了催化剂 Ｃａ Ｔｉ０．９ Ｌｉ０．１ Ｏ３δ晶格中的氧空位，关联了氧空位、可活动氧量与催化剂的乙烷氧化脱氢（ Ｏ Ｄ Ｈ Ｅ）反应的催化性能，提出了乙烷在该类催化剂上氧化脱氢的选择性氧物种为 ８７３～１０２３ Ｋ 的温度范围内脱附的所谓可活动氧（ Ｏ－ ， Ｏ２－ ， Ｏ２－２ 简写为 Ｏδ）．利用 Ｏ２ Ｔ Ｐ Ｄ Ｍ Ｓ鉴定了 Ｔ Ｇ Ａ 结果，证明该法简便、实用、可靠．The oxygen vacancies in the lattice of the catalyst CaTi 0.9 Li 0.1 O 3 δ have been characterized by means of TGA and O 2 TPD MS. It was found that there a close relationship between the oxygen vacancies, the non fully reduced oxygen species(or mobile oxygen) and the ethylene selectivity. The effect of Li + doping was explained by increasing oxygen vacancies and non fully reduced oxygen species. The non fully reduced oxygen species are suggested as the active sites responsible for ethylene selectivity for the oxidative dehydrogenation of ethane(ODHE) reaction.

关 键 词：TGA 氧空位 钙钛矿型 复合氧化物 催化剂 

分 类 号：O643.36[理学—物理化学]