有序介孔Ni/Al_2O_3催化剂的制备及其催化浆态床CO_2甲烷化性能研究
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- 英文论文题名：Preparation of Order mesoporous Ni/Al_2O_3 catalyst and its catalytic performance for CO_2 methanation in a slurry-bed reactor
- 论文作者：李鑫 ; 孟凡会 ; 李忠
- 英文论文作者：Xin LI ; Fanhui Meng ; Zhong LI ; Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi province ; Taiyuan University of Technology
- 年：2016
- 作者机构：太原理工大学煤科学与技术教育部和山西省重点实验室;
- 论文关键词：浆态床反应器 ; CO_2甲烷化 ; Ni/Al_2O_3催化剂 ; 有序介孔
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十七分会：纳米催化
- 语种：中文
- 分类号：O643.36
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十七分会 ; 纳米催化
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：145k
- 原文格式：D
- 会议级别：全国
摘要
镍基催化剂由于其催化活性高、甲烷选择性好等优点广泛应用于甲烷化反应。采用不同方法制备了三种孔结构的Ni/Al_2O_3催化剂并应用于浆态床CO_2甲烷化反应中。N2吸脱附结果表明,三种方法制备的Ni基催化剂均具有介孔结构,其中以P123为模板剂采用溶剂挥发诱导自组装法制备的P-OM-NiAl催化剂孔径和孔容最大,分别为6.79nm和1.13cm~3·g~(-1),以溶胶凝胶法制备的M-NiAl催化剂孔径和孔容最小。XRD和HR-TEM结果表明,P-OM-NiAl催化剂具有规整的介孔结构,活性组分Ni高度分散且金属Ni晶粒尺寸最小。在浆态床反应器中300℃、1.0 MPa、3000 mL·g~(-1)·h~(-1)条件下进行CO_2甲烷化评价时,P-OM-NiAl催化剂具有最佳的CO_2甲烷化性能,CO_2转化率和CH4选择性分别达到73.3%和99.5%。溶胶凝胶法制备的M-NiAl催化剂的甲烷化性能最差。
Ni-based catalyst has been widely used in methanation reaction due to its high catalytic activity and CH4 selectivity.Ni/Al_2O_3 catalysts with different kinds of pore structures were prepared by three methods and applied in a slurry-phase CO_2 methanation.N_2 adsorption-desorption results show that the three Ni-based catalysts exhibited mesoporous structures.Among them,P-OM-NiAl catalyst,prepared via solvent evaporation induced self-assembly method(EISA) by using P123 as template exhibited the pore diameter and volume of 6.79 nm and 1.13 cm~3 ·g~(-1),respectively,while the M-NiAl catalyst prepared by sol-gel method exhibited the smallest.XRD and HR-TEM results indicated that P-OM-NiAl catalyst had the order mesoporous structure,highest Ni dispersion and smallest Ni crystallite size.At 300 ℃,1.0 MPa,3000 mL·g~(-1)·h~(-1) P-OM-NiAl catalyst shows the optimal catalytic activity in a slurry-bed reactor,with the CO_2 conversion of 73.3%and CH_4 selectivity of 99.5%.M-NiAl shows the lowest activity.
Ni-based catalyst has been widely used in methanation reaction due to its high catalytic activity and CH4 selectivity.Ni/Al_2O_3 catalysts with different kinds of pore structures were prepared by three methods and applied in a slurry-phase CO_2 methanation.N_2 adsorption-desorption results show that the three Ni-based catalysts exhibited mesoporous structures.Among them,P-OM-NiAl catalyst,prepared via solvent evaporation induced self-assembly method(EISA) by using P123 as template exhibited the pore diameter and volume of 6.79 nm and 1.13 cm~3 ·g~(-1),respectively,while the M-NiAl catalyst prepared by sol-gel method exhibited the smallest.XRD and HR-TEM results indicated that P-OM-NiAl catalyst had the order mesoporous structure,highest Ni dispersion and smallest Ni crystallite size.At 300 ℃,1.0 MPa,3000 mL·g~(-1)·h~(-1) P-OM-NiAl catalyst shows the optimal catalytic activity in a slurry-bed reactor,with the CO_2 conversion of 73.3%and CH_4 selectivity of 99.5%.M-NiAl shows the lowest activity.
引文
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