Promoting Effects of Lanthan on Ru/AC for Ammonia Synthesis: Tuning Catalytic Efficiency and Stability Simultaneously - Details

author：

Ni, J. (Ni, J..) ^[1] | Lin, J. (Lin, J..) ^[2] | Wang, X. (Wang, X..) ^[3] | Lin, B. (Lin, B..) ^[4] | Jiang, L. (Jiang, L..) ^[6]

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Scopus

Abstract：

La−Ba-K−Ru/AC　catalysts　for　ammonia　synthesis　were　prepared　by　co-impregnation　method　using　graphited　active-carbon　as　the　support　and　water-soluble　chloride-free　Ru　complex　as　the　precursor.　The　results　demonstrate　that　the　La　promoted　Ba-K−Ru/AC　catalysts　exhibit　good　catalytic　activity,　high　thermal　stability　and　strong　resistance　against　methanation.　TEM　(Transmission　Electron　Microscope)　and　CO　(carbon　monoxide)　chemisorption　analysis　indicate　that　the　Ru　particles　had　a　relatively　uniform　size　of　3∼5　nm　and　the　particle　surface　might　be　partially　covered　by　LaOx　and　BaOx.　H2-TPR　(Temperature　Programmed　Reduction)　results　suggest　that　strong　interactions　might　exist　between　the　Ru　particles　and　the　promoters　(La　and　Ba).　The　N2-TPD　(Temperature　Programmed　Desorption)　and　H2-TPD　measurements　show　that　the　presence　of　small　amount　of　La　enhances　the　adsorption　of　N2　and　inhibits　the　adsorption　of　H2,　resulting　in　higher　TOF　values　and　better　catalytic　performances.　Moreover,　no　obvious　agglomeration　of　Ru　particles　was　observed　on　the　catalysts　after　heat　resistance.　The　superior　catalytic　stability　of　La−Ba-K−Ru/AC　is　associated　with　its　strong　resistance　against　methanation　of　active-carbon　due　to　highly　coverage　of　ruthenium　surface　and　strong　inhibition　of　hydrogen　by　promoters.　©　2017　Wiley-VCH　Verlag　GmbH　&　Co.　KGaA,　Weinheim

Keyword：

ammonia synthesis; lanthanum; ruthenium; thermostability

Community：

[ 1 ] [Ni, J.]National Engineering Research Center of Chemical Fertilizer Catalyst, School of Chemical Engineering, Fuzhou University, Fujian, 350002, China
[ 2 ] [Lin, J.]Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
[ 3 ] [Lin, J.]National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters, Xiamen University, Xiamen, 361005, China
[ 4 ] [Wang, X.]National Engineering Research Center of Chemical Fertilizer Catalyst, School of Chemical Engineering, Fuzhou University, Fujian, 350002, China
[ 5 ] [Lin, B.]National Engineering Research Center of Chemical Fertilizer Catalyst, School of Chemical Engineering, Fuzhou University, Fujian, 350002, China
[ 6 ] [Lin, J.]National Engineering Research Center of Chemical Fertilizer Catalyst, School of Chemical Engineering, Fuzhou University, Fujian, 350002, China
[ 7 ] [Jiang, L.]National Engineering Research Center of Chemical Fertilizer Catalyst, School of Chemical Engineering, Fuzhou University, Fujian, 350002, China

Reprint 's Address：

[Lin, J.]National Engineering Research Center of Chemical Fertilizer Catalyst, School of Chemical Engineering, Fuzhou UniversityChina

Email：

lin3jx@fzu.edu.cn

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Source ：

ChemistrySelect

ISSN： 2365-6549

Year： 2017

Issue： 21

Volume： 2

Page： 6040-6046

1 . 5 0 5

JCR@2017

1 . 9 0 0

JCR@2023

ESI HC Threshold：226

JCR Journal Grade：3

CAS Journal Grade：4

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WoS CC Cited Count：

SCOPUS Cited Count：

ESI Highly Cited Papers on the List： 0 Unfold All

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Chinese Cited Count：

30 Days PV： 0

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