摘要
不同温度下直接煅烧偏钨酸铵制备了晶化程度不同的两种氧化钨(WO_(3)-500和WO_(3)-900),通过XRD、SEM、TEM、XPS、H_(2)-TPR和NH3-TPD手段对WO_(3)载体负载Pt前后的物化性质进行了系统的表征,低温反应条件下研究了不同氧化钨负载Pt对萘加氢的催化性能。与WO_(3)-900载体相比,低温煅烧得到具有较低的结晶程度,载体中大量的W5+物种和负载的Pt具有强的相互作用,并显示出较强的酸性。在低的反应温度下(70℃),Pt/WO_(3)-500催化剂对萘加氢合成十氢萘具有优异的催化性能,萘的转化率和十氢萘的选择性均达到100%;在Pt/WO_(3)-900催化下萘的转化率和十氢萘的选择性仅为26.7%和1.7%。结合催化剂的表征和催化反应结果,揭示了氧化钨中的氧缺陷位是提升Pt/WO_(3)催化性能的关键因素,对设计高效的WO_(3)负载Pt催化剂催化萘合成十氢萘提供了一定的理论指导。
Two tungsten oxides(WO_(3)-500 and WO_(3)-900)were prepared at different calcination temperatures by using ammonium mettungstate as tungsten source.The physicochemical properties of WO_(3) before and after Pt loading were systematically characterized by XRD,SEM,TEM,XPS,H_(2)-TPR,and NH3-TPD.The influence of the crystallization degree of WO_(3) on the hydrogenation of naphthalene was studied under low-temperature reaction conditions.Compared with the WO_(3)-900 support,WO_(3)-500 obtained by calcination at lower temperature exhibited a lower crystallization degree with a large amount of W5+species,which resulted in strong interactions with Pt.The strong interaction between W species and Pt contributed to the high acidic strength.The Pt/WO_(3)-500 catalyst demonstrated excellent catalytic performance for naphthalene hydrogenation to decalin at low reaction temperature(70℃)with full conversion and 100%decalin selectivity.Under identical conditions,conversion and decalin selectivity were only 26.7%and 1.7%over the Pt/WO_(3)-900 catalyst.Combining the characteristics of the catalysts and their catalytic results,we revealed the promoting role of oxygen defects in WO_(3)-supported Pt catalysts in the hydrogenation of naphthalene to decalin,which will provide theoretical guidance for designing efficient WO_(3)-supported Pt catalysts for hydrogenation reactions.
作者
赵彤
赵斌彬
牛玉峰
梁瑜
刘雷
董晋湘
唐明兴
李学宽
ZHAO Tong;ZHAO Bin-bin;NIU Yu-feng;LIANG Yu;LIU Lei;DONG Jin-xiang;TANG Ming-xing;LI Xue-kuan(College of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China)
出处
《燃料化学学报》
CSCD
北大核心
2021年第8期1181-1189,共9页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金(U1910202,21978194)
山西省“1331工程”和山西省青年三晋学者支持计划资助。
关键词
萘
十氢萘
铂
氧化钨
加氢
催化剂
结晶
naphthalene
decalin
platinum
tungsten oxide
hydrogenation
catalyst
crystallization
