Development of a Supported Catalyst for Decomposition of Spent Sulfuric Acid

Study of the Stability of Catalysts for Decomposition of Spent Sulfuric Acid

“…2. Comparison of curves 1 and 2, corresponding to pure and silicated aluminum oxide [1], demonstrates not only the quantitative aspect of differences in abradability between these two supports, but also the fact that these dependences differ in their nature. For example, curve 2 of the time dependence of abradability of a silicated sample levels off after first 30 h of its operation, whereas the loss of pure g-Al 2 O 3 remains appreciable within the entire period of tests, although it becomes slower in the course of time.…”

“…The stability of operation of a catalyst [1] in decomposition of spent sulfuric acid (SSA) containing organic admixtures is strongly affected by several factors, including the mechanical action associated with the mode of the boiling bed and a long exposure to a high temperature. The first factor can promote destruction of the support and removal of active components.…”

Study of I−/I2 Poisoning of Fe2O3-Based Catalysts for the H2SO4 Decomposition in the Sulfur−iodine Cycle for Hydrogen Production

“…Various catalysts have been employed in the H 2 SO 4 decomposition since the early work of Dokiya et al These authors studied various oxides of Si, Al, Zn, Cu, Fe, Ni, Co, Mn, Cr, V, and Ti and reported that iron(III) oxide exhibited the highest catalytic activity almost constant for more than 100 h of operation. For all these catalysts (metal oxides), the main mechanism for decrease of the catalytic activity seems to be related to sulfate formation and to specific surface area modifications. , …”

“…For all these catalysts (metal oxides), the main mechanism for decrease of the catalytic activity seems to be related to sulfate formation 6 and to specific surface area modifications. 7,8 Another candidate catalyst for H 2 SO 4 decomposition is platinum, supported on various oxides such as SiO 2 and Al 2 O 3 . Ginosar at al.…”