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铂催化剂的氢吸附与反应性能间的关联研究——Ⅱ.C_6烷烃转化反应和稳定性与氢吸附的关系 被引量:1

CORRELATION OF H_2 ADSORPTION WITH REACTION PERFORMANCE FOR SUPPORTED PLATINUM CATALYST Ⅱ. RELATIONSHIP BETWEEN HYDROGEN ADSORPTION AND ACTIVITY AND STABILITY FOR C_6 HYDROCARBON CONVERSION
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摘要 本文阐述了铂催化剂的氢吸附与稳定性和C_6烷烃反应活性间的关系。研究结果表明,α型(室温)不可逆吸氢量能够表征负载铂催化剂的反直活性,并与环己烷和正己烷反应的初始转化率呈线性关系;催化剂可逆吸附的氢能够抑制催化剂积炭失活的速率,当催化剂表面可逆吸附氢的浓度达到9.32×10^(12)atom/cm^2(360℃)或1.38×10^(13)atom/cm^2(450℃),催化剂就能够在相应温度下抗积炭而不失活。 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3期22-27,共6页 Acta Petrolei Sinica(Petroleum Processing Section)
基金 国家自然科学基金资助课题
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