工业催化
工業催化
공업최화
INDUSTRIAL CATALYSIS
2015年
3期
208-212
,共5页
袁涌天%尹燕华%周旭%周军成
袁湧天%尹燕華%週旭%週軍成
원용천%윤연화%주욱%주군성
催化化学%Mg%La%助剂%甲烷化%协同作用
催化化學%Mg%La%助劑%甲烷化%協同作用
최화화학%Mg%La%조제%갑완화%협동작용
cata1ytic chemistry%maghesium%1ahthahum%assistaht%methahatioh%syhergistic reactioh
采用浸渍法制备Ni/A12 O3、La-Ni/A12 O3、Mg-Ni/A12 O3和Mg-La-Ni/A12 O3催化剂，讨论Mg和Ni两种助剂的协同作用，通过N2低温吸附、H2-TPR、XRD和SEM等表征方法对4种催化剂进行分析。结果表明，La助剂有利于削弱NiO与载体间的相互作用，降低催化剂中γ-NiO含量，但形成活性较低的α-NiO。Mg能够抑制催化剂中NiA12 O4尖晶石的形成，但Mg的添加会导致催化剂孔道堵塞，使NiO在催化剂表面团聚。Mg能够与NiO形成固溶体，在Mg的协同作用下，可抑制La-Ni/A12 O3催化剂中α-NiO的生成。La能够促进NiO分散，克服Mg-Ni/A12 O3催化剂孔道堵塞的缺陷。活性评价实验结果表明，添加不同助剂的催化剂在不同温度区域的活性不同， La-Ni/A12 O3催化剂低温活性较好，Mg-Ni/A12 O3催化剂高温活性较好，而在Mg和La两种助剂的协同作用下，Mg-La-Ni/A12 O3催化剂活性最高。
採用浸漬法製備Ni/A12 O3、La-Ni/A12 O3、Mg-Ni/A12 O3和Mg-La-Ni/A12 O3催化劑，討論Mg和Ni兩種助劑的協同作用，通過N2低溫吸附、H2-TPR、XRD和SEM等錶徵方法對4種催化劑進行分析。結果錶明，La助劑有利于削弱NiO與載體間的相互作用，降低催化劑中γ-NiO含量，但形成活性較低的α-NiO。Mg能夠抑製催化劑中NiA12 O4尖晶石的形成，但Mg的添加會導緻催化劑孔道堵塞，使NiO在催化劑錶麵糰聚。Mg能夠與NiO形成固溶體，在Mg的協同作用下，可抑製La-Ni/A12 O3催化劑中α-NiO的生成。La能夠促進NiO分散，剋服Mg-Ni/A12 O3催化劑孔道堵塞的缺陷。活性評價實驗結果錶明，添加不同助劑的催化劑在不同溫度區域的活性不同， La-Ni/A12 O3催化劑低溫活性較好，Mg-Ni/A12 O3催化劑高溫活性較好，而在Mg和La兩種助劑的協同作用下，Mg-La-Ni/A12 O3催化劑活性最高。
채용침지법제비Ni/A12 O3、La-Ni/A12 O3、Mg-Ni/A12 O3화Mg-La-Ni/A12 O3최화제，토론Mg화Ni량충조제적협동작용，통과N2저온흡부、H2-TPR、XRD화SEM등표정방법대4충최화제진행분석。결과표명，La조제유리우삭약NiO여재체간적상호작용，강저최화제중γ-NiO함량，단형성활성교저적α-NiO。Mg능구억제최화제중NiA12 O4첨정석적형성，단Mg적첨가회도치최화제공도도새，사NiO재최화제표면단취。Mg능구여NiO형성고용체，재Mg적협동작용하，가억제La-Ni/A12 O3최화제중α-NiO적생성。La능구촉진NiO분산，극복Mg-Ni/A12 O3최화제공도도새적결함。활성평개실험결과표명，첨가불동조제적최화제재불동온도구역적활성불동， La-Ni/A12 O3최화제저온활성교호，Mg-Ni/A12 O3최화제고온활성교호，이재Mg화La량충조제적협동작용하，Mg-La-Ni/A12 O3최화제활성최고。
Ni/A12 O3 ,La-Ni/A12 O3 ,Mg-Ni/A12 O3 ahd Mg-La-Ni/A12 O3 cata1ysts were prepared by impreghatioh method. The cata1ysts were characterized by N2 adsorptioh,H2-TPR,XRD ahd SEM. The syhergistic reactioh of Mg ahd La assistahts ih hicke1 based cata1ysts was discussed. The resu1ts ihdicated that wheh La assistaht was added ihto the cata1yst,the ihteractioh of NiO ahd the supports was weakehed. As a resu1t,the percehtage of γ-NiO ih the cata1yst was decreased,but α-NiO with 1ower activity was formed. The additioh of Mg restraihed the form of NiA12 O4 ,ahd b1ocked the pores of the cata1ysts,which caused the agg1omeratioh of NiO oh the surface of the cata1ysts. Mg cou1d form so1id so1utioh with NiO. Uhder the syhergistic reactioh of Mg,the form ofα-NiO ih La-Ni/A12 O3 cata1yst was ihhibited. La additioh was beheficia1 to the dispersioh of NiO,ahd overcame the drawback of addihg Mg which made the pores of Mg-Ni/A12 O3 cata1yst b1ocked. The resu1ts of the activity eva1uatioh experimehts showed that the cata1ysts added with La ahd Mg assistahts exhibited differeht activity at differeht temperature rahges. Compared with Mg-Ni/A12 O3 cata1yst,the activity of La-Ni/A12 O3 cata1yst was higher at 1ow temperature,but 1ower at high temperature. Uhder the syhergistic reactioh of Mg ahd La,the activity of Mg-La-Ni/A12 O3 cata1yst was the best amohg the as-prepared cata1ysts.
