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铂催化剂的氢吸附与反应性能间的关联研究——Ⅲ.C_6烷烃转化选择性与氢吸附的关系 被引量:1

CORRELATION OF ADSORPTION WITH REACTION PERFORMANCE FOR SUPPORTED Pt CATALYST Ⅲ.HYDROGEN ADSORPTION AND SELECTIVITIES OF HEXANE
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摘要 本文阐述了铂催化剂的氢吸附与C_6烷烃反应选择性间的关系。研究结果表明,催化剂的吸氢分数f能够反映值化剂的C_6烷烃反应选择性的变化特征.在300℃反应时,环己烷脱氢反应受到不可逆吸附氢的抑制。在3600℃反应时,正己烷氢解和异构化的选择性分别与β型吸氢中心的可逆吸氢分数f_r(β)和不可逆吸氢分数f_1(β)呈线性上升趋势。在450℃反应时,正己烷芳构化选择性和γ型吸氢中心的不可逆吸氢分数f_1(γ)呈线性关系,而加氢裂解和异构化的选择性则随可逆吸氢分数f_r(γ)的增大而增加。上述经验关系能较好地预测催化剂的反应特征。可以认为,在临氢条件下,烷烃的转化是在被氢改性的催化剂上进行的。 The relationship between H_2 adsorption and the selectivities for hexane conversion over Pt catalyst was investigated.The results showed that the adsorption fraction of H_2 could reflect the catalytic performance of Pt catalysts for C_6 conversion. At 360℃, the isomerization selectivity of n-hexane increased linearly with the fraction of the irreversible adsorption of H_2 at the same temperature, and at 450℃, the selectivities of aromatization as well as isomerization and hydrocracking of n-hexane went up linearly with the fraction of irreversible and reversible adsorption of H_2 at the same temperature respectively. However, the dehydrogenation of cyclohexane at 300℃ was inhibited by the irreversible adsorption of H_2. Furthermore,the performance of supported Pt catalyst could be predicated by these linear relations with an average error below 5%. These results indicated that the uptake and state of H_2 adsorbed on the catalyst was one of the main factors to control the product distribution of hydrocarbon conversion, and also implied that the conversion of hydrocarbon might occur on the surface of catalyst modified by the adsorbed hydrogen.
出处 《石油学报(石油加工)》 EI CAS CSCD 北大核心 1991年第4期46-51,共6页 Acta Petrolei Sinica(Petroleum Processing Section)
基金 国家自然科学基金资助项目
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