Sulfate accumulation in commercial Pd-Pt/Al2O3 and Pt/Al2O3 catalysts used for removal of hydrogen from carbon dioxide
Sulfate accumulation in commercial Pd-Pt/Al2O3 and Pt/Al2O3 catalysts used for removal of hydrogen from carbon dioxide
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DOI：
10.1016/0926-860x(94)85020-8
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发表时间：
1994-11
影响因子：
5.5
通讯作者：
Youquan Deng;L. An
中科院分区：
文献类型：
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作者：
Youquan Deng;L. An
本文研究了工业Pd-Pt/Al_2 O_3和Pt/Al_2 O_3催化剂在H_2-O_2反应中的硫酸盐积累。硫酸盐与Al 2 O3之间存在两种相互作用，即表面沉积（SO 3或SO 42 −基团键合到Al 2 O3表面）和本体硫酸化（形成水合硫酸铝），导致比表面积急剧下降，载体结构发生变化。Pd（Pt）不仅在硫酸盐的生成过程中起重要作用，而且在硫酸盐与Al 2 O3的固相反应中也起重要作用。能量色散X射线显示不同的硫酸盐分布在催化剂颗粒，即“均匀”，“蛋壳”和“鸡蛋白色”类型。提出了一个硫酸根迁移反应的模型来解释这些硫酸根分布过程，并讨论了反应温度、Al 2 O3载体性质与硫酸根沉积速率、含量、结构和分布之间的关系。
An investigation of sulfate accumulation in commercial Pd-Pt/Al2O3and Pt/Al2O3catalysts used for the elimination of hydrogen from carbon dioxide by the H2-O2reaction has been conducted. Two types of interaction between sulfate and Al2O3, i.e. surface deposition (SO3or SO42−groups bonded to Al2O3surface) and bulk sulfation (formation of aluminum sulfate hydrate), were found, which caused a drastic decrease in surface area and change in support structure. Pd(Pt) played an important role not only in sulfate formation but also in the solid-state reaction between sulfate and Al2O3. Energy dispersive X-ray revealed different sulfate distributions in catalyst pellets, i.e. ‘uniform’, ‘egg shell’ and ‘egg white’ types. A model for the sulfate group transport reaction is proposed to elucidate these sulfate distribution processes, and the relationship between the reaction temperature, the properties of the Al2O3support and sulfate deposition rate, content, structure and distributions are discussed.