Abstract: In order to improve the activity of coal-based activated carbon (AC) in catalytic decomposition of methane to produce hydrogen,the structure and surface properties of activated carbon (xCa-AC) prepared by KOH chemical activation method are adjusted by adding Ca(OH)2 in situ to the coal.FT-IR,XRD,SEM and other analysis results show that the in-situ addition of Ca(OH)2 on coal can increase specific surface area and pore volume of xCa-AC,as well as the concentration of oxygen-containing groups on the surface of xCa-AC and the disorder of carbon structure.In the process of catalytic decomposition of methane to hydrogen,xCa-AC contributes a higher conversion rate than AC,and increases the number of carbon fibers in the carbon deposit.
罗化峰, 李通达, 乔元栋, 宁掌玄, 薄春丽. Ca(OH)2对煤基活性炭及其催化甲烷裂解制氢的影响[J]. 现代化工, 2021, 41(4): 162-166.
LUO Hua-feng, LI Tong-da, QIAO Yuan-dong, NING Zhang-xuan, BO Chun-li. Effects of Ca(OH)2 on coal-based activated carbon and its catalytic property in methane decomposition to hydrogen. Modern Chemical Industry, 2021, 41(4): 162-166.
[1] Khalifeh O,Mosallanejad A,Taghvaei H,et al.Decomposition of methane to hydrogen using nanosecond pulsed plasma reactor with different active volumes,voltages and frequencies[J].Applied Energy,2016,169:585-596. [2] Ashik U P M,Daud W M A W,Hayashi J.A review on methane transformation to hydrogen and nanocarbon:Relevance of catalyst characteristics and experimental parameters on yield[J].Renewable Sustainable Energy Reviews,2017,76:743-767. [3] Tanggarnjanavalukul C,Donphai W,Witoon T,et al.Deactivation of nickel catalysts in methane cracking reaction:Effect of bimodal meso-macropore structure of silica support[J].Chemical Engineering Journal,2015,262:364-371. [4] Ren J,Cao J,Zhao X,et al.Extension of catalyst lifetime bydoping of Ce in Ni-loaded acid-washed Shengli lignite char for biomass catalytic gasification[J].Catalysis Science & Technology,2017,7:5741-5749. [5] Shen Y,Lua A C.Synthesis of Ni and Ni-Cu supported on carbon nanotubes for hydrogen and carbon production by catalytic decomposition of methane[J].Applied Catalysis B:Environmental,2015,164:61-69. [6] Italiano G,Delia A,Espro C,et al.Methane decomposition over Co thin layer supported catalysts to produce hydrogen for fuel cell[J].International Journal of Hydrogen Energy,2010,35:11568-11575. [7] Jana P,Víctor A,Coronado J M,et al.Cobalt based catalysts prepared by Pechini method for CO2-free hydrogen production by methane decomposition[J].International Journal of Hydrogen Energy,2010,35:10285-10294. [8] Nuernberg G B,Fajardo H V,Mezalira D Z,et al.Preparation and evaluation of Co/Al2O3 catalysts in the production of hydrogen from thermo-catalytic decomposition of methane:influence of operating conditions on catalyst performance[J].Fuel,2008,87:1698-1704. [9] Dasireddy V D B C,Likozar B.Activation and decomposition of methane over cobalt-,copper-,and iron-based heterogeneous catalysts for COx-free hydrogen and multiwalled carbon nanotube production[J].Energy Technology,2017,5:1344-1355. [10] Calafat A,sanchez N.Production of carbon nanotubes through combination of catalyst reduction and methane decomposition over Fe-Ni/ZrO2 catalysts prepared by the citrate method[J].Applied Catalysis A:General,2016,528:14-23. [11] Bayat N,Rezaei M,Meshkani F.Hydrogen and carbon nanofibers synthesis by methane decomposition over Ni-Pd/Al2O3 catalyst[J].International Journal of Hydrogen Energy,2016,41:5494-5503. [12] Zhang J,Li X,Chen H,et al.Hydrogen production by catalytic methane decomposition:Carbon materials as catalysts or catalyst supports[J].International Journal of Hydrogen Energy,2017,42:19755-19775. [13] Muradov N.Catalysis of methane decomposition over elemental carbon[J].Catalysis Communications,2001,2:89-94. [14] Zhang J,Jin L,Liu S,et al.Mesoporous carbon prepared from direct coal liquefaction residue for methane decomposition[J].Carbon,2012,50:952-959. [15] Zhang J,Jin L,Cheng J,et al.Preparation and applications of hierarchical porous carbons from direct coal liquefaction residue[J].Fuel,2013,109:2-8. [16] Zhang J,Jin L,Li Y,et al.Hierarchical porous carbon catalyst for simultaneous preparation of hydrogen and fibrous carbon by catalytic methane decomposition[J].International Journal of Hydrogen Energy,2013,38:8732-8740. [17] Wang J,Jin L,Zhou Y,et al.Effect of Ca(NO3)2 addition in coal on properties of activated carbon for methane decomposition to hydrogen[J].Fuel Processing Technology,2018,176:85-90.