Hydrogen production by the photoreforming of methanol and the photocatalytic water-gas shift reaction
Hydrogen production by the photoreforming of methanol and the photocatalytic water-gas shift reaction
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DOI：
10.1088/2515-7655/abdd82
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发表时间：
2021-04-01
影响因子：
6.9
通讯作者：
Bowker, Michael
中科院分区：
文献类型：
--
作者：
Kennedy, Julia;Hayward, James;Bowker, Michael
我们研究了甲醇和CO在Pd/P25 TiO 2催化剂上重整制氢，并将其与类似负载的Au和Cu催化剂的速率进行了比较。两种反应都进行，但光催化水煤气变换（WGS）反应比甲醇重整慢得多。如预期的那样放出CO2，但产率可能远低于预期的化学计量（CH 3OH + H2O -> CO2 + 3 H（2））。我们表明，这是由于二氧化碳溶解到水相中。我们还在气相中进行了这两种反应。两者在气相中以较高速率进行，并且对于甲醇重整，存在一些CO释放。在H-2 + CO2反应中，几乎没有逆WGS反应的迹象，但确实发生了一些光甲烷化。三种催化剂中，Pd催化剂对甲醇重整反应的催化效果最好，而Au催化剂对水煤气变换反应的催化效果最好。尽管如此，Cu对于甲醇重整相当好地起作用，并且是一种便宜得多的、地球上丰富的催化剂。
We have examined the reforming of methanol and CO on Pd/P25 TiO2 catalysts for hydrogen production, and compared it with rates for similarly supported Au and Cu catalysts. Both reactions proceed, but the photocatalytic water-gas shift (WGS) reaction is much slower than for methanol reforming. CO2 is evolved as expected, but the yields can be much lower than for the expected stoichiometry (CH3OH + H2O -> CO2 + 3H(2)). We show that this is due to dissolution of the carbon dioxide into the aqueous phase. We have also carried out both reactions in the gas phase. Both proceed at a higher rate in the gas phase, and for methanol reforming, there is some CO evolution. In H-2 + CO2 reactions, there is little sign of the reverse WGS reaction, but some photo-methanation does occur. Of the three catalysts Pd is the best for the methanol reforming reaction, while Au is best for the water-gas shift. Nonetheless, Cu works reasonably well for methanol reforming and makes a much cheaper, earth-abundant catalyst.