Simultaneous Catalytic Hydrolysis of Carbonyl Sulfide and Carbon Disulfide over Modified Microwave Coal-Based Active Carbon Catalysts at Low Temperature

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• 作者：Ping Ning ; Kai Li ; Honghong Yi ; Xiaolong Tang ; Jinhui Peng ; Dan He ; Hongyan Wang ; Shunzheng Zhao
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：August 16, 2012
• 年：2012
• 卷：116
• 期：32
• 页码：17055-17062
• 全文大小：535K
• 年卷期：v.116,no.32(August 16, 2012)
• ISSN：1932-7455

文摘

A series of microwave coal-based active carbon catalysts loaded by metal oxides were prepared by a sol鈥揼el method and tested for the simultaneous catalytic hydrolysis of carbonyl sulfide (COS) and carbon disulfide (CS₂) at relatively low temperatures of 50鈥?0 掳C. The influences of preparation conditions on catalytic activity were studied, which were the kinds and amount of additive, calcination temperatures, and types and content of alkali. The results show that catalysts with 5.0% Fe₂O₃ after calcining at 300 掳C have superior activity for the simultaneous catalytic hydrolysis of COS and CS₂. It also indicated that the catalytic hydrolysis activity increased with the basic intensity, following the order of KOH > K₂CO₃ > Na₂CO_3聽> NaHCO₃, and the optimum amount of KOH was 13%. The structure and surface properties were characterized by X-ray diffractometry (XRD), Brunauer-Emmett-Teller measurements (BET), Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy (XPS). The XRD and BET results revealed that the calcination temperature controlled the crystalline phase and generation of Fe₂O₃ and affected the properties of specific surface area and pore structure. The XPS results showed that most of COS and CS₂ hydrolysis products were sulfate ion (SO₄^{2鈥?/sup>) species, which accumulated on the active carbon鈥檚 surface and had a negative effect on the hydrolysis activity.}