Improving catalytic activity and stability by in-situ regeneration of Ni-based catalyst for hydrogen production from ethanol steam reforming via controlling of active species dispersion | |
Zhao XX(赵夏夏)1,2; Lu GX(吕功煊)1 | |
刊名 | International Journal of Hydrogen Energy |
2016 | |
卷号 | 41期号:32页码:13993-14002 |
关键词 | Regeneration of Ni catalyst Ethanol steam reforming Hydrogen production Metal-support interaction High dispersion |
ISSN号 | 0360-3199 |
通讯作者 | 吕功煊 |
英文摘要 | Nickel is an active component of catalyst for hydrogen production from ethanol steam reforming (ESR). However, Ni based catalyst usually meets severe deactivation due to coking. Normally, Ni catalyst regeneration could be achieved by heating coked catalyst in the oxygen contained atmosphere gas to remove coked carbon by oxidation of carbon. During this regeneration process, dispersed Ni particles are easily segregated because burning of carbon generates huge amount of heat and leads to uncontrollable temperature increase. In this paper, a new regeneration method of Ni catalyst was developed by re-deposition of another portion of Ni on deactivated Ni/SiO2 catalyst (denoted as catalyst 2) instead of O2 combustion of the deactivated catalyst (denoted as catalyst 1). H2-TPR results indicated that the metal-support interaction of catalyst 2 was stronger than that of catalyst 1, leading to higher metal dispersion and smaller Ni particles size over catalyst 2. The H2 chemisorption and HRTEM results indicated the dispersion of catalyst 2 reached 19.3%, much higher than 9.4% of catalyst 1. The dimension of late-loaded Ni particle was around 9.5 nm, even smaller than that of catalyst 1 (17.5 nm), corresponding to the high catalytic activity and stability of catalyst 2. The ethanol conversion of catalyst 1 and catalyst 2 were 76.5% and 94.6% at 500 °C, respectively. After short term of 20 h test, the ethanol conversion of catalyst 2 still remained, while that of the catalyst 1 decreased to about 40% of initial activity under same reaction condition (T = 550 °C, S/C = 7.5, LHSV = 4.1 h−1 and P = 1 atm.). |
学科主题 | 物理化学与绿色催化 |
收录类别 | SCI |
资助信息 | the 973 Program and 863 Program of Department of Sciences and Technology China (Grant Nos. 2013CB632404;2012AA051501);the National Natural Science Foundation of China (Grant Nos. 21373245;21433007) |
语种 | 英语 |
WOS记录号 | WOS:000381950800013 |
内容类型 | 期刊论文 |
源URL | [http://210.77.64.217/handle/362003/20353] |
专题 | 兰州化学物理研究所_OSSO国家重点实验室 |
作者单位 | 1.Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Oxo Synth & Select Oxidat, Lanzhou 730000, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
推荐引用方式 GB/T 7714 | Zhao XX,Lu GX. Improving catalytic activity and stability by in-situ regeneration of Ni-based catalyst for hydrogen production from ethanol steam reforming via controlling of active species dispersion[J]. International Journal of Hydrogen Energy,2016,41(32):13993-14002. |
APA | Zhao XX,&Lu GX.(2016).Improving catalytic activity and stability by in-situ regeneration of Ni-based catalyst for hydrogen production from ethanol steam reforming via controlling of active species dispersion.International Journal of Hydrogen Energy,41(32),13993-14002. |
MLA | Zhao XX,et al."Improving catalytic activity and stability by in-situ regeneration of Ni-based catalyst for hydrogen production from ethanol steam reforming via controlling of active species dispersion".International Journal of Hydrogen Energy 41.32(2016):13993-14002. |
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