文献类型：期刊文献

中文题名：甘油氢解双金属Ir-Re催化剂的结构调控:焙烧温度的影响

英文题名：Effects of Calcination Temperature on Bimetallic Ir-Re Catalyst Structure and Catalytic Performance in Glycerol Hydrogenolysis

作者：邓澄浩[1];任鑫[1];张宏[1];周静红[1];周兴贵[1];袁渭康[1]

机构：[1]化学工程联合国家重点实验室,华东理工大学化工学院,上海200237

年份：2016

卷号：30

期号：2

起止页码：384

中文期刊名：高校化学工程学报

外文期刊名：Journal of Chemical Engineering of Chinese Universities

收录：CSTPCD;;EI(收录号：20162102408154);Scopus;北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；

基金：国家自然科学基金(21106047)

语种：中文

中文关键词：焙烧温度;Ir-Re合金;甘油氢解;1,3-丙二醇

外文关键词：calcination temperature;Ir-Re alloy;glycerol hydrogenolysis;1;3-propanediol

摘要：采用浸渍法制备了一系列双金属Ir-Re催化剂,通过TEM、XRD、TPR、NH_3-TPD和CO-DRIFTS考察了350~650℃焙烧温度对催化剂结构的影响,并考评了其催化甘油氢解性能。结果表明,低温(350℃)焙烧处理的双金属催化剂中Ir和Re物种能够被完全还原为金属态,还原后形成Ir-Re合金结构;而高温(500和650℃)焙烧显著降低了Re物种的还原能力,还原后形成氧化铼(ReOx)部分覆盖于Ir金属表面,形成Ir-ReOx的结构。低温焙烧所得的催化剂具有更高的甘油氢解催化活性和1,3-丙二醇选择性,这是由于低温焙烧的Ir-Re合金催化剂具有更高的金属分散度和更多的酸性位Re-OH。
The effect of calcination temperature 350~650℃on the structure of bimetallic Ir-Re catalysts and catalytic performance in glycerol hydrogenolysis was investigated using TEM,XRD,TPR,NH_3-TPD and CO-DRIFTS.The results reveal that Re reducibility and Ir-Re structure depend strongly on calcination temperature.Low temperature(350℃)calcination results in fully reducible Re species and tends to form Ir-Re alloy after reduction.When bimetallic Ir-Re catalysts are treated at higher calcination temperatures(i.e.,500 and 650℃),the formation of Ir-ReOx structure is favored due to the decrease of Re reducibility.Additionally,glycerol hydrogenolysis tests show that the bimetallic Ir-Re catalyst calcined at low temperature exhibits better activity and selectivity,which is attributed to better metal dispersion and more acidic Re-OH sites.