文献类型：期刊文献

英文题名：Effect of calcination temperature on structure, composition and properties of S2O82-/ZrO2 and its catalytic performance for removal of trace olefins from aromatics

作者：Zhao, Qing[1];Yao, Jiajia[1];Shi, Li[1];Wang, Xin[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2016

卷号：6

期号：87

起止页码：84553

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20163702808959);WOS:【SCI-EXPANDED(收录号:WOS:000384129300125)】；

语种：英文

外文关键词：Catalyst activity - Aromatization - Precipitation (chemical) - Phase composition - Olefins - Synthesis (chemical) - Chemical analysis - Zirconia - Calcination - Computer software reusability

摘要：A solid superacid catalyst, S2O82-/ZrO2 (S(2)Z), was synthesized by the immersion-precipitation method to remove olefins from aromatics; the effect of calcination temperature on the structure, chemical and phase composition and properties of persulfated zirconia were studied. A series of synthesized catalyst samples were characterized by TG-DTG, XRD, SEM, FTIR, FTIR pyridine adsorption (py-IR) and N-2 adsorption analysis. The characterization results revealed that the outstanding activity for removal trace olefins from aromatics is attributed to the interaction between sulfur species and ZrO2, particularly the more covalent persulfate with tetragonal zirconia (t-ZrO2), and the calcination temperature was shown to be the key factor in governing the phase composition of S(2)Z. Py-IR analysis indicated that the high catalytic activity was well correlated with excellent acidity, primarily with the Lewis acidity of S(2)Z. Different calcination temperatures influenced the amount of catalytically active t-ZrO2, which was favorable to increasing the number of acid sites, improving surface properties and thus enhancing the catalytic activity. Moreover, the regeneration procedure did not change the structure and crystal form of the catalyst. The catalytic activity test revealed that S(2)Z calcined at 650 degrees C was superiorly active and efficiently reusable to remove trace olefins and exhibits promising application prospects in industry.