铂铼重整催化剂硫酸根污染的研究

选取铂铼重整催化剂，模拟工业再生过程中催化剂上硫酸根的形成机理，制备了含有硫酸 催化剂样品。以正庚烷为模型化合物，在连续加压微反色谱装置上对样品进行活性评价。实验表明，硫酸根本抑制不了催化剂的酸性和金属功能，同时加快了催化剂的失活速率，使芳构化活性与选择性大幅度下降，高鳞铂比（ｎ（Ｒｅ）／ｎ（Ｐｔ）＝２）催化剂地硫酸 的敏感程度大于ｎ（Ｒｅ）／ｎ（Ｐｔ）＝１的催化剂。催化剂表面结构表征表明，硫酸根

STUDIES ON SULFATE ION CONTAMINATION OF Pt-Re REFORMING CATALYST

Bimetallic Pt Re reforming catalyst samples containing different amounts of sulfate ion were prepared by simulating the formation of sulfate on reforming catalysts during industrial regeneration n Heptane as the model compound was employed to test activity and selectivity of the samples on continuous flow pressure microreactor chromatograph system As a result, sulfate ion suppressed both acid function and metal function of the catalyst samples and accelerated deactivation Catalysts with n (Re)/ n (Pt) =2 were more sensitive to sulfate than catalysts with n (Re)/ n (Pt)=1 The characterization of catalyst surface structure proved that the sulfate ion formation didn't affect platinum particle size and the suppression of metal function was due to excessive sulfidation of the metal fraction by H 2S produced during the reduction of the sulfated catalysts with hydrogen Though the formation of sulfate ion did not destroy the support structure, it caused a decline in chlorine content and surface Lewis acid sites and thus the difficulties for chlorine regulation