催化作用
锡
甘油
介孔材料
钙钛矿(结构)
化学工程
材料科学
选择性
化学
有机化学
工程类
作者
Zandile Mhlwatika,Reinout Meijboom,Ndzondelelo Bingwa
标识
DOI:10.1016/j.inoche.2021.108962
摘要
• Perovskites were synthesized through the nanocasting method. • Perovskites were fully characterised and were found to be mesoporous. • Tin-based catalysts are better catalysts due to high acidity content. • Perovskites exhibited excellent stability as determined by kinetics of deactivatio. Herein, we report on the catalytic activity of ABO 3 perovskites (A = La, Sr or Sn, B = Co, Mn, Sn, Fe, or Al) synthesized by nanocasting using silica-based KIT-6 and SBA-15 as hard templates. The search for less expensive and easy to synthesize active catalysts is gaining momentum due to global financial markets that escalate the prices of precious metals. Interestingly, alternatives that utilize affordable commodities than precious metals have attracted interest. The biodiesel industry is playing a more central part in fuel economy in many developing economies. This work focuses on circumventing the drawbacks of the bio-fuel industry by valorising glycerol, a by-product of biodiesel production into value-added chemicals through the acetalization reaction. The as-synthesized perovskites, with surface areas ranging from 19 to 99 m 2 /g, showed up to 100% glycerol conversion and selectivity towards 2-methylol-1,4-dioxaspirol [4] , [5] decane. Perovskites containing tin (Sn) showed better catalytic activity than the rest of the catalysts. The NH 3 -TPD results suggest that the greater catalytic activity observed in tin-based perovskites is mainly due to their high acidity content. Furthermore, we showed that the catalyst reusability can be studied in-depth using kinetics and our catalyst showed good stability in the first two cycles.
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