天然气化工(C1化学与化工)
天然氣化工(C1化學與化工)
천연기화공(C1화학여화공)
Natural Gas Chemical Industry
2015年
4期
6-10
,共5页
曾艳%马宏方%张海涛%应卫勇%房鼎业
曾豔%馬宏方%張海濤%應衛勇%房鼎業
증염%마굉방%장해도%응위용%방정업
甲烷化%镍基催化剂%溶液燃烧法%Mg%Mn%La
甲烷化%鎳基催化劑%溶液燃燒法%Mg%Mn%La
갑완화%얼기최화제%용액연소법%Mg%Mn%La
methanation%Ni-based catalyst%solution combustion method%Mg%Mn%La
采用溶液燃烧法制备了Ni/γ-Al2O3甲烷化催化剂,考察了Mg、Mn和La助剂对催化剂在甲烷化反应中催化性能的影响,采用N2低温吸附、H2-TPR、XRD、TEM和CO-TPD对样品进行了表征。实验结果表明,Mg和Mn助剂的添加会加强活性组分与载体间的相互作用,而La的添加会削弱活性组分和载体间的相互作用。含La助剂的Ni基催化剂(Ni-La)上Ni颗粒具有更小的平均粒径,增加了催化剂表面的活性位,有利于CO的吸附,从而提高了催化剂的活性。 Ni-La低温活性优异,在反应温度为300℃时,含La的催化剂上CO转化率达到99%;并且该催化剂在高温反应中也具有良好的稳定性。
採用溶液燃燒法製備瞭Ni/γ-Al2O3甲烷化催化劑,攷察瞭Mg、Mn和La助劑對催化劑在甲烷化反應中催化性能的影響,採用N2低溫吸附、H2-TPR、XRD、TEM和CO-TPD對樣品進行瞭錶徵。實驗結果錶明,Mg和Mn助劑的添加會加彊活性組分與載體間的相互作用,而La的添加會削弱活性組分和載體間的相互作用。含La助劑的Ni基催化劑(Ni-La)上Ni顆粒具有更小的平均粒徑,增加瞭催化劑錶麵的活性位,有利于CO的吸附,從而提高瞭催化劑的活性。 Ni-La低溫活性優異,在反應溫度為300℃時,含La的催化劑上CO轉化率達到99%;併且該催化劑在高溫反應中也具有良好的穩定性。
채용용액연소법제비료Ni/γ-Al2O3갑완화최화제,고찰료Mg、Mn화La조제대최화제재갑완화반응중최화성능적영향,채용N2저온흡부、H2-TPR、XRD、TEM화CO-TPD대양품진행료표정。실험결과표명,Mg화Mn조제적첨가회가강활성조분여재체간적상호작용,이La적첨가회삭약활성조분화재체간적상호작용。함La조제적Ni기최화제(Ni-La)상Ni과립구유경소적평균립경,증가료최화제표면적활성위,유리우CO적흡부,종이제고료최화제적활성。 Ni-La저온활성우이,재반응온도위300℃시,함La적최화제상CO전화솔체도99%;병차해최화제재고온반응중야구유량호적은정성。
Ni/γ-Al2O3 methanation catalysts with different promoters (Mg, Mn and La) were prepared by solution combustion method, and characterized by N2 adsorption, XRD, TEM and CO-TPD. The results indicated that the Mg, Mn promoters enhanced the interaction between Ni and Al, while La promoter weakened the interaction. Moreover, La-doped catalyst (Ni-La) possessed smaller Ni particles, exposing more accessible active surface to reactants, which would improve CO adsorption capacity, facilitating CO methanation. Ni-La exhibited excellent low-temperature catalytic activity with a CO conversion of 99% at 300℃, and also showed good high-temperature stability.