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首页> 外文期刊>Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications >Characterization of WO_x/Al_2O_3 and MoO_x/Al_2O_3 catalysts and their activity and deactivation during skeletal isomerization of 1-butene
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Characterization of WO_x/Al_2O_3 and MoO_x/Al_2O_3 catalysts and their activity and deactivation during skeletal isomerization of 1-butene

机译：WO_x / Al_2O_3和MoO_x / Al_2O_3催化剂的表征及其在1-丁烯骨架异构化过程中的活性和失活

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摘要

A comparative study of the activity and deactivation of alumina supported tungs ten and molydenum oxides was performed.The catalysts were prepared by impregnation on gamma- and alpha-theta Al_2O_3 and their activity,selectivity and deactivation during skeletal isomerization of 1-butene(380 deg C,atmospheric pressure) was assessed.the catalysts were further characterized by means of temperature programmed reduction (TPR),X-ray diffraction (XRD),sortometry and laser Raman spectroscopy.The amount temperature programmed reduction(TPR),X-ray diffraction(XRD),sortometry and laser Raman spectroscopy.The amount and nature of coke deposits produced during the reaction were determined by temperaure programmed oxidation(TPO) and laser Raman spectroscopy.best activity and selectivity values for both catalysts were obtained at intermediate W and Mo loadings which seemingly corresponded ot an optimum concnetration of surface tetrahedrally coordinated species.Tungsten supported catlysts performed better than molybdenm ones.when the support was alpha-thetaAl_2O_3 the amount of coke was low but high calcinatio temperatures were needed t burn it off,because of its aromatic or pregraphitic nature.
机译：比较了氧化铝负载的钨十和氧化钼的活性和失活。进行了程序升温还原（TPR），X射线衍射（XRD），分光光度法和激光拉曼光谱分析。进一步表征了催化剂的性能。程序升温还原量（TPR），X射线衍射（XRD），分光光度法和激光拉曼光谱法。通过程序升温氧化（TPO）和激光拉曼光谱法确定反应过程中产生的焦炭沉积物的数量和性质。在中间体W和Mo下获得两种催化剂的最佳活性和选择性值似乎与表面四面体配位物种的最佳浓缩相对应的负载量。当载体为α-thetaAl_2O_3时，焦炭的含量较低，但由于其芳香性或前兆性质，需要将其烧掉以保持较高的煅烧温度。

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