A novel biorefinery: Biorecovery of precious metals from spent automotive catalyst leachates into new catalysts effective in metal reduction and in the hydrogenation of 2-pentyne

A novel biorefinery: Biorecovery of precious metals from spent automotive catalyst leachates into new catalysts effective in metal reduction and in the hydrogenation of 2-pentyne
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新型生物精炼厂:将废汽车催化剂浸出液中的贵金属生物回收成可有效金属还原和 2-戊炔氢化的新催化剂

DOI:
10.1016/j.mineng.2017.08.011
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发表时间:
2017
影响因子:
4.8
通讯作者:
Murray A
Murray A
中科院分区:
工程技术2区
文献类型:
--
作者:
Murray A

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为了从废汽车催化剂浸出液中回收贵金属(PM)到新的催化剂中,大肠杆菌细胞首先将Pd(II)或Pt(IV)生理还原为纳米颗粒细胞结合的Pd(0)和Pt(0)。金属化的细胞,然后被用来作为化学催化剂,从模型解决方案和fromaqua regialeacates破碎的废汽车催化剂的还原回收贵金属。由于其他污染物的干扰,真实的沥滤液中的金属去除较慢,60 h后完成。来自废物的生物制造PM催化剂将0.5mM Cr(VI)还原至与商业5%Pd催化剂相似的程度,但速率为一半。考察了工业Pd/Al_2O_3催化剂和生物合成Pd/Pt催化剂对2-戊炔加氢反应的催化活性,后者对顺式戊烯的选择性提高了3倍以上。因此,生物精制PM为废物处理和有效的新催化剂生物制造提供了一条清洁的途径。
With the aim to recover precious metals (PMs) from spent automotive catalyst leachates into new catalysts, cells ofEscherichia colifirst reduced Pd(II) or Pt(IV) physiologically to nanoparticulate cell-bound Pd(0) and Pt(0). Metallised cells were then used as chemical catalysts for the reductive recovery of precious metals from model solutions and fromaqua regialeachates of crushed spent automotive catalyst. Metal removal, which was slower from real leachate due to interference by other contaminants, was complete after 60 h. Biofabricated PM catalyst from waste reduced 0.5 mM Cr(VI) to a similar extent to commercial 5% Pd catalyst but at ∼half the rate. The hydrogenation of 2-pentyne was examined using commercial Pd on Al2O3catalyst and biofabricated Pd/Pt catalyst, the latter showing more than 3-fold enhanced selectivity towards the desiredcis-pentene product. Hence, biorefined PMs offer a clean route to waste treatment and effective neo-catalyst biomanufacture.
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