It is produced primarily by steam-cracking of hydrocarbons, but can alternatively be produced by the dehydration of ethanol, which can be produced from fermentation processes using renewable substrates such as glucose, starch and others. CAS  Suzuki, T.; Okuhara, T.; Microporous Mesoporous Mater. It is in agreement with a previous report.26 The preferential removal of Si results in the lower molar ratio of SiO2/Al2O3 in the zeolites. 26.4% HPW/CZ at 300 °C (>150 ethanol pulses): 100% conversion/selectivity to ethylene. The samples were treated with solutions of 0.2, 0.4, 0.8 and 1.0 mol L–1 NaOH for 2 h at 75 ºC, respectively. Salusjärvi L, Havukainen S, Koivistoinen O, Toivari M. Appl Microbiol Biotechnol. Today 182, 16 (2012), V.V. J. Hence, the different O 1s surface atoms can be identified and divided into three types including lattice oxygen (O, 530.7 eV), surface hydroxyl (OH, 532.1 eV) and lattice water (H2O, 532.9 eV). The decrease of the catalytic activity for AT0.4 is due to the coke deposition on the surface of the catalyst, which blocks the pore mouth of zeolite crystal. Chem. CAS  Catal. ACS Omega. Catal., A 2006, 302, 69. In this paper, the acidity and pore structure of alkali-treated HZSM-5 were investigated. Bjørgen, M.; Joensen, F.; Holm, M. S.; Olsbye, U.; Lillerud, K. P.; Svelle, S.; Appl. The catalytic ethanol dehydration of ethanol over the solvothermal-derived alumina catalysts was investigated in this study. A.; Moulijn, J. J Oleo Sci. 296, 572 (2006), M. Wannaborworn, P. Praserthdam, B. Jongsomjit, J. Nanomater. Clipboard, Search History, and several other advanced features are temporarily unavailable. [ Links ], 14. The Vmeso decreases slightly from 0.18 cm3 g–1 for the AT0.4 to 0.17 cm3 g–1 for AT0.8 or AT1.0, which is due to the backward deposition of amorphous Si on some mesopores or the collapse of zeolite framework.28 In a word, AT0.8 sample has a mesopore volume very close to that of AT0.4, while its external surface is just slightly lower. 2001, 43, 83. 2006, 16, 2121.  |  As performances catalíticas melhoradas dos catalisadores com tratamento alcalino são atribuídas, principalmente, aos mesoporos criados e à diminuição de sítios ácidos fortes durante o tratamento alcalino. Takahara, I.; Saito, M.; Inaba, M.; Murata, K.; Catal. Ceram. The reaction products were followed by mass spectra in the interval of 200–400 °C. A 104, 171 (1995), T. Nakajima, B. Žemva, A. Tressaud, Advanced Inorganic Fluorides: Synthesis, Characterization and Applications (Elsevier Science, New York, 2000), p. 384, J.T. XEtOH and SE still keep 97% at 350 h. In comparison to the fresh catalyst, the regenerated catalyst exhibits a little lower XEtOH and a higher SE. PubMed Central  20, 63 (2016), K. Ramesh, L. Hui, Y. Han, A. Borgna, Catal. The stability of alkali-treated catalysts on dehydration of ethanol. Journal of Porous Materials 231–232, S. Sato, M. Kuroki, T. Sodesawa, F. Nozaki, G.E.  |  National Center for Biotechnology Information, Unable to load your collection due to an error, Unable to load your delegates due to an error, J-STAGE, Japan Science and Technology Information Aggregator, Electronic. In summary, the better SE and stability of the regenerated AT0.4 is attributed to the decreased acidity and the increased number of mesopores after regeneration. ��D��&NcA��$A��$"����b�ݦ��� �� 2008, 10, 336. 9, 207 (2008), S.S. Akarmazyan, P. Panagiotopoulou, A. Kambolis, C. Papadopoulou, D.I. [ Links ], 5. NIH The catalytic performance of alkali-treated HZSM-5 catalysts was investigated in a continuous fixed-bed microreactor. Technol. 272, 92 (2015), T. Kamsuwan, B. Jongsomjit, Eng. 2016, 8 (2015), A. Klisin„ska, K. Samson, I. Gressel, B. Grzybowska, Appl. 65, 347 (2016), Article  Today 125, 111 (2007), Article  However, little work has been carried out to investigate the catalytic performance of alkali-treated HZSM-5 zeolites on ethanol dehydration to ethylene. Bjørgen et al. Catalytic dehydration of ethanol to ethylene over alkali-Treated HZSM-5 zeolites, Qingtao ShengI; Shaoqing GuoII,*; Kaicheng LingI; Liangfu ZhaoIII,*, ICollege of Chemistry and Chemical Engineering, Taiyuan University of Technology, 030024 Taiyuan, Shanxi, P. R. China IISchool of Environment and Safety, Taiyuan University of Science and Technology, 030024 Taiyuan, Shanxi, P. R. China IIIInstitute of Coal Chemistry, Chinese Academy of Sciences, 030001 Taiyuan-Shanxi, P. R. China. 20, 151 (2013), O. [ Links ], 36. Figure 3 shows the NH3-TPD profiles of all samples. More discussions on the technical readiness level and commer-cial plants for ethanol production can be found elsewhere [23–26].