Key Laboratory for Green Process of Chemical Engineering of Xinjiang Bingtuan, Shihezi University School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China
Abstract: Vermiculite (VTM) is modified by "expansion-acidification" to prepare two-dimensional layered porous nanosheets (EXVTM-SiO2),which are used as support to prepare Ni/EXVTM-SiO2 catalysts with different loading amounts for methane reforming reaction by means of impregnation method.The catalysts are characterized by BET,XRD,XRF,SEM,H2-TPR,TEM and TG techniques,and the stability experiment for the catalysts has been carried out under atmospheric pressure at 750℃ for 300 min.Experimental results show that 10%Ni/VTM-SiO2 exhibits a better catalytic activity and stability,over which the initial conversion rates of CO2 and CH4 are 92% and 55%,respectively.The main reason is that 10%Ni/EXVTM-SiO2 catalyst has a larger specific surface area and better metal dispersion,so that it has a certain degree of carbon deposition and sintering resistance.
[1] Akbari E,Alavi S M,Rezaei M,et al.Synthesis gas production over highly active and stable nanostructured Ni-MgO-Al2O3 catalysts in dry reforming of methane:Effects of Ni contents[J].Fuel,2017,194:171-179. [2] Usman M,Daud W M A Wan,Abbas H F,et al.Dry reforming of methane:Influence of process parameters-A review[J].Renewable and Sustainable Energy Reviews,2015,45:710-744. [3] Cui W G,Zhang G Y,Hu T L,et al.Metal-organic framework-based heterogeneous catalysts for the conversion of C1 chemistry:CO,CO2 and CH4[J].Coordination Chemistry Reviews,2019,387:79-120. [4] Chen J H,Arandiyan H,Gao X,et al.Recent advances in catalysts for methane combustion[J].Catalysis Surveys from Asia,2015,19(3):140-171. [5] Kang X,Guo X,You H,et al.The economic and social benefit of C1 utilization in china[J].Energy Sources,Part B:Economics,Planning,and Policy,2015,10(2):111-119. [6] Al-Fatesh A,Singh S K,Kanade G S,et al.Rh promoted and ZrO2/Al2O3 supported Ni/Co based catalysts:High activity for CO2 reforming,steam-CO2 reforming and oxy-CO2 reforming of CH4[J].International Journal of Hydrogen Energy,2018,43(27):12069-12080. [7] Park J H,Yeo S,HeO I,et al.Promotional effect of Al addition on the Co/ZrO2 catalyst for dry reforming of CH4[J].Applied Catalysis A:General,2018,562:120-131. [8] Chotirach M,Tungasmita S,Nuntasri Tungasmita D,et al.Titanium nitride promoted Ni-based SBA-15 catalyst for dry reforming of methane[J].International Journal of Hydrogen Energy,2018,43(46):21322-21332. [9] Xie Z H,Yan B H,Kattel S,et al.Dry reforming of methane over CeO2-supported Pt-Co catalysts with enhanced activity[J].Applied Catalysis B:Environmental,2018,236:280-293. [10] Senseni A Z,Rezaei M,Meshkani F,et al.Glycerol steam reforming over noble metal nanocatalysts[J].Chemical Engineering Research and Design,2017,123:360-366. [11] Yue L,Li J M,Chen C,et al.Thermal-stable Pd@mesoporous silica core-shell nanocatalysts for dry reforming of methane with good coke-resistant performance[J].Fuel,2018,218:335-341. [12] Kim S M,Abdala P M,Margossian T,et al.Cooperativity and dynamics increase the performance of NiFe dry reforming catalysts[J].Journal of the American Chemical Society,2017,139(5):1937-1949. [13] Song K,Lu M,Xu S,et al.Effect of alloy composition on catalytic performance and coke-resistance property of Ni-Cu/Mg(Al)O catalysts for dry reforming of methane[J].Applied Catalysis B:Environmental,2018,239:324-333. [14] Das Subhasis,Sengupta Manideepa,Bag Arijit,et al.Facile synthesis of highly disperse Ni-Co nanoparticles over mesoporous silica for enhanced methane dry reforming[J].Nanoscale,2018,10(14):6409-6425. [15] Al-Doghachi F A J,Rashid U,Zainal Z,et al.Influence of Ce2O3 and CeO2 promoters on Pd/MgO catalysts in the dry-reforming of methane[J].RSC Advances,2015,5(99):81739-81752. [16] Park J H,Yeo S,Chang T S,et al.Effect of supports on the performance of Co-based catalysts in methane dry reforming[J].Journal of CO2 Utilization,2018,26:465-475. [17] Ma Q,Sun J,Gao X,et al.Ordered mesoporous alumina-supported bimetallic Pd-Ni catalysts for methane dry reforming reaction[J].Catalysis Science & Technology,2016,6(17):6542-6550. [18] Zhang R,XIA G,Li M,et al.Effect of support on the performance of Ni-based catalyst in methane dry reforming[J].Journal of Fuel Chemistry and Technology,2015,43(11):1359-1365. [19] Gao X Q,Lu W D,Hu S Z,et al.Rod-shaped porous alumina-supported Cr2O3 catalyst with low acidity for propane dehydrogenation[J].Chinese Journal of Catalysis,2019,40(2):184-191. [20] Mousavi S M,Meshkani F,Rezaei M,et al.Preparation of nanocrystalline Zr,La and Mg-promoted 10% Ni/Ce0.95Mn0.05O2 catalysts for syngas production via dry reforming reaction[J].International Journal of Hydrogen Energy,2018,43(13):6532-6538. [21] Cao Y,Maitarad P,Gao M,et al.Defect-induced efficient dry reforming of methane over two-dimensional Ni/h-boron nitride nanosheet catalysts[J].Applied Catalysis B:Environmental,2018,238:51-60.