文献类型：期刊文献

英文题名：Roles of niobium in the dehydrogenation of propane to propylene over a Pt/Nb-modified Al2O3 catalyst

作者：Zhao, Tianhao[1];Shen, Shanshan[1];Jia, Yanyan[2];Pao, Chih-Wen[3];Chen, Jeng-Lung[3];Guo, Yong[1];Liu, Xiaohui[1];Dai, Sheng[2];Wang, Yanqin[1]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Res Inst Ind Catalysis, Sch Chem & Mol Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Adv Mat & Feringa Nobel Prize Scientist J, Inst Fine Chem, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[3]Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan

年份：2020

卷号：44

期号：46

起止页码：20115

外文期刊名：NEW JOURNAL OF CHEMISTRY

收录：;EI(收录号：20205109659530);WOS:【SCI-EXPANDED(收录号:WOS:000597581100015)】；

基金：This work was supported financially by the NSFC of China (No. 21832002, 21872050, 21808063), the Fundamental Research Funds for the Central Universities (222201718003) and the Science and Technology Commission of Shanghai Municipality (10dz2220500). Additional support was provided by the Feringa Nobel Prize Scientist Joint Research Center.

语种：英文

外文关键词：Catalyst selectivity - Chemical reactors - Catalyst supports - Aluminum oxide - Platinum compounds - Propane - Dehydrogenation - Fourier transform infrared spectroscopy - Niobium oxide - X ray absorption spectroscopy - Sintering - Carbon - Propylene - Alumina - Platinum

摘要：The application of Pt-based catalysts in propane dehydrogenation (PDH) is restricted by low propylene selectivity, metal sintering and carbon deposition. It has been reported that the performance of catalysts is strongly related to the electronic and geometric properties of the Pt particles and the acidity of the support. Herein, we report that a niobium-modified alumina supported platinum catalyst exhibits high propylene selectivity and superior stability. A high conversion of 28.8% and a high propylene selectivity above 96% are achieved over the Pt/Nb1Al2-O catalyst for propane dehydrogenation at 600 degrees C after 8 h in a fixed bed reactor. Consecutive dehydrogenation-regeneration operations showed that the stability of Pt/Nb1Al2-O was much higher than that of Pt/Al2O3. NH3-TPD revealed that the strong acidity is decreased, while the medium acidity is increased after introducing niobium into Al2O3, which may be attributed to the formation of new acid sites, probably Lewis acid sites from niobium oxide species. CO-adsorbed FTIR spectroscopy, CO chemisorption, X-ray photoelectron spectroscopy (XPS), and X-ray absorption spectroscopy (XAS) results revealed the enhancement of electron density and the decrease of dispersion of Pt particles after the introduction of Nb, which is beneficial for inhibiting the by-reactions (carbon formation and C-C bond cleavage).