铁基高温变换催化剂制备的穆斯堡尔谱研究──I．铁氧化物前驱态的相变过程  

STUDY ON THE PREPARATION OF Fe-BASED HIGH TEMPERATURE SHIFT CATALYST BY MOSSBAUER SPECTROSCOPY I. The Phase Transrormation of Different Iron Oxide Precursors

作　　者：马红钦[1] 张继炎[1] 谭欣[1] 张鎏[1] 王日杰[1] 张宝峰[1] 

机构地区：[1]天津大学化工系,天津大学应用物理系

出　　处：《Chinese Journal of Catalysis》1995年第5期365-370,共6页催化学报（英文）

基　　金：国家自然科学基金

摘　　要：用穆斯堡尔诺及ＸＲＤ技术对不同铁氧化物前驱态的相变过程进行了研究．ＦｅＣＯ３沉淀在空气中老化时被氧化分解生成ＦｅＯ（ＯＨ），经干燥、煅烧后全部转化为α－Ｆｅ２Ｏ３Ｆｅ（ＯＨ）２沉淀物在空气中老化时则转化为ＦｅａＯ４·２Ｈ２Ｏ和ＦｅＯＯＨ，并且两者的相对含量受Ｆｅ２＋的迁移速度和Ｆｅ（ＯＨ）２的氧化速度的影响．干燥、煅烧后，Ｆｅ３Ｏ４·２Ｈ２Ｏ转化生成γ－Ｆｅ２Ｏ３，ＦｅＯＯＨ则转化生成α－Ｆｅ２Ｏ３，由此所得铁氧化物的晶型是可以调节的．The phase transformation of different iron oxide precursors (FeCO3and Fe (OH)2) was studied by M0ssbauer spectroscopy and XRD. The FeCO3 precipitate was oxidized and decomposed into FeO(OH) during aging in air and turned into the only product α-Fe2O3 after drying and calcination. The Fe (OH)2 precipitate has a different way of phase transformation, i. e. Fe(OH)2 changed into Fe3O4· 2H2O and FeOOH by aging in air, the former then changed into γ-Fe2O3 and the latter into α-Fe2O3 as the final product after drying and calcination. The relative quantity of α-Fe2O3 and γ-Fe2O3 in the product can be controlled by changing the aging condition.

关 键 词：铁氧化物 晶型 穆斯堡尔谱 催化剂 

分 类 号：TQ426.81[化学工程] O481.4[理学—固体物理]