Mo对Ni-Mg-Al水滑石催化CH_4-CO_2重整反应的影响  

Effect of Different Mo Content on CH_4 Reforming of CO_2 Over Ni-Mg-Al Hydrotalcite Catalyst

作　　者：沈朝峰[1] 郝树宏[2] 黄伟[1] 谭鹏甲 

机构地区：[1]太原理工大学煤科学与技术教育部和山西省重点实验室,太原030024 [2]山西电力科学研究院,太原030001

出　　处：《太原理工大学学报》2014年第2期239-243,共5页Journal of Taiyuan University of Technology

基　　金：国家"863"计划资助项目(2013AA051201)

摘　　要：在Ni-Mg-Al水滑石催化剂体系中引入不同质量分数的Mo后,Mo可插入到Ni-MgAl水滑石层状结构中;经过焙烧后,Mo可进入NiO-MgO固溶体结构中,形成了非常稳定的Mo物种,即使在800℃下也不能将其还原成单质Mo.当Mo质量分数为1%和3%时,能有效地增强金属Ni与载体的相互作用力,抑制Ni金属的烧结和积碳;当Mo质量分数大于5%时,过量的Mo破坏了稳定的Ni-Mg-Al水滑石层状结构,导致Ni与载体的相互作用力减弱,并在反应过程中生成MoO3物种,覆盖了活性金属位,导致催化剂活性和稳定性下降。Mo was fully integrated into the structure of hydrotalcite after different mass fraction of Mo was added into the Ni-Mg-Al hydrotalcite. In addition, very stable Mo species was formed after calcination because Mo was blended in NiO-MgO solid solution. The Mo species could not be reduced to Moo under the reduction condition. With addition of Mo at 1 % and 3 %, the strong support-metal interaction was formed. Thus, the sintering and carbon deposition were suppressed. When the content of Mo was more than 5 %, the stable layered structure of Ni-Mg- Al hydrotalcite was destroyed and the support-metal interaction was weaker. In addition, MoO3 was formed during the reaction process so that the active site Ni was covered by the formed MOO3. As a result, the catalytic stability declined sharply.

关 键 词：CH4重整 CO2 水滑石 MO 

分 类 号：O643[理学—物理化学]